69results about How to "Address governance issues" patented technology

The invention discloses a geopolymer and a preparation method and application thereof. The geopolymer is at least prepared from fly ash, shield muck and an alkaline activator. The main component of the shield muck is clay, and the mass ratio of the fly ash to the dried shield muck is (1-2):3; the mass ratio of a mixture of the fly ash and the dried shield muck to the alkaline activator is 1:(0.14-0.18). According to the geopolymer, the high-mud-content shield muck is subjected to recycling application, and the preparation raw materials do not include any type of traditional cementing materialssuch as cement and lime, so that large carbon emission is avoided, and the cost is low. The geopolymer is high in strength and good in water resistance. The preparation method of the geopolymer includes the steps that the alkaline activator is added into the mixture of the fly ash and the shield muck through spraying to avoid large aggregates; the mixed wet material is tightly pressed in a mold,so that a geopolymer test piece has relatively high strength and water resistance.

A plant method for in-situ treating the soil polluted by Cd features that the plant Dongnan Jingtian is directly planted in the polluted soil for absorbing the Cd from the soil and after the plant is growing for 3-4 months, it is removed. Its advantages are high effect and speed and no secondary pollution.

The invention discloses an in-trench water-stone separation siphoning-drainage debris flow control method. A series of permeable pipes are disposed in a trench in an area for formation or passage of debris flow, and drain siphons are connected to downstream ends of the permeable pipes. When the water level of rain flood reaches the siphoning level, water permeating into the permeable pipes is drained to the downstream safety trench through the drain siphons so that dynamic strength of the water in the trench is reduced. Using the method can effectively control formation and passage of debris flow and solve treatment methods for debris flow trenches on different scales, and control engineering is simple in construction and high in adaptability. Gravity flow is converted into full in-pipe flow under the action of siphoning drainage, and drainage efficiency is improved. Pipe sedimentation can be prevented under the suction action of siphoning. Diverted drainage in the case of high water level has low impact on the hydrological environment of the trench.

The invention belongs to the sewage treatment technology field, in particular relates to a device for treating refractory organic sewage with nanosecond pulse discharge plasma, comprising a tower reactor, a nanosecond pulse power supply and an air compressor pump which are connected by pipelines. The upper part of the tower reactor is provided with a water lattice, the middle part is provided with discharge electrodes, the bottom part is provided with a clear water tank, the top part is provided with a sewage inlet, and the bottom part is provided with a clear water outlet; the discharge electrodes of the middle part are connected with the external nanosecond pulse power supply, and the outer wall of the tower reactor is grounded; the lower part of the tower reactor is connected with the air compressor pump through a pipeline on which a gas-pressure meter is arranged, and the air compressor pump is provided with a reaction gas recovery port, the middle pipeline is provided with a one-way gas valve; and the air compressor pump is provided with an air inlet. The invention can effectively reduce the COD of organic waste water, improve BOD / COD, is good to biochemical degradation, can realize the discharge of organic waste water meeting standards and even the recycling use, is energy-saving, and has low treatment cost.

The invention provides a control method for restraining harmonic current of a doubly-fed wind generator stator side. The method comprises the steps that a doubly-fed wind generator mathematical model under an nth-degree harmonic rotating coordinate system is established, and a voltage control compensation item under an nth-degree harmonic rotor dq coordinate system is obtained; the decision variable of the fifth-degree harmonic current control link and the decision variable of the seventh-degree harmonic current control link are introduced into vector control of a doubly-fed wind generator side converter, and reference instructions of the fifth-degree harmonic and the seventh-degree harmonic of a doubly-fed wind generator stator and the voltage component and the rotor modulation voltage under the dq coordinate system are obtained; PWM control signals of the doubly-fed wind generator side converter are generated through modulation. The control target of restraining the stator harmonic current is achieved, and the effect of the harmonic current on a wind generator is reduced.

The invention discloses a modeling method for a cross-domain information sharing exchange data model. The method comprises the following steps: S1, modeling a sharing exchange data dictionary; S2, establishing an information exchange service model; S3, generating a shared exchange directory. The data description is unique to form standardized data dictionaries, the machine readability of the datain the exchange process is realized; the data management problem can be effectively solved; a computer can automatically draw a data association graph to realize unified modeling of shared and exchanged government affair data, a standard shared and exchanged data dictionary is formed, a shared and exchanged directory is optimized according to the dictionary, and the problems of inconsistent data description, single directory structure and the like in a current urban cross-domain data sharing and exchanging process are solved.

The invention discloses synthesis of a novel catalyst and an application method thereof in catalyzing condensation of acetone and hydroxyaldehyde. The method comprises the following steps: adding acetone into a distillation kettle connected with a reactor and an apparatus for refluxing to remove water; then adding little catalyst into the reactor, carrying out reflux reaction for a certain time ata certain temperature when mixing, sampling to analyze; when the reaction is balanced, ending the reaction to obtain the product in the reaction kettle. The substance in the reactor is material acetone that is not adequately reacted and can be used as the reactant of next batch of reaction.

The invention relates to a method for producing degradable plastics by using activated sludge, which comprises the following steps: 1) adding the following substance components in parts by weight into a mixing machine and uniformly mixing: 25-45 parts of activated sludge powder, 15-35 parts of high molecular material, 10-25 parts of fiber powder, 5-15 parts of activated carbon powder, 10-20 parts of adhesive and assistants, wherein the assistants comprise sodium stearate, coupling agent and compatilizer; the mass of the sodium stearate is 2% of that of the activated carbon powder; the mass of the coupling agent is 1% of that of the activated carbon powder; and the mass of the compatilizer is 3-5% of the total mass; and 2) plastifying and extruding the mixture obtained in the step 1) through a single screw extruder, granulating, and performing secondary processing to obtain the biodegradable plastics. The method uses wastes in life, sludge and straws, as the raw materials, realizes reutilization of the wastes, and avoids secondary pollution brought by the existing sludge treatment method; and the obtained plastics can be completely degraded to serve as a fertilizer for improving soil. Thus, the method has the characteristics of low carbon, environment friendliness, simple process, high production efficiency and low cost.

The invention provides a debris flow prevention and treatment system. The debris flow prevention and treatment system can solve the problem that after water and stone of the debris flow are separated,stone blocks block a cover plate with holes and guarantee the debris flow water and stone separation system can durably and effectively play the role. The debris flow prevention and treatment systemcomprise a drainage system and a vibration system. The drainage system comprises a water collecting pool, the cover plate with the holes and a drainage pipe. The vibration system comprises a rotatingrod, a fixing shaft, a pedal, a support block and a spring. The debris flow prevention and treatment system can achieve effective control over the formation process and circulation process of the debris flow and solve the treatment problems of different scales of debris flow gullies. Soil and stone are separated from water by means of the water collecting pool and the drainage pipe, so that the hydrodynamic condition of the debris flow is weakened, and the damage power of the debris flow is reduced. The vibration system utilizes the kinetic energy of large stone blocks in the debris flow as power and can continuously and effectively guarantee that vibration happens, and therefore the cover plate is prevented from being blocked; and in this way, the drainage system can stably play the role,and effective prevention and treatment of the debris flow are achieved.

The invention discloses a biological treatment method for municipal sludge. The invention firstly discloses a biological agent for treating sludge. The biological agent includes multiple microorganisms composed of compound saccharomycetes, bacillus subtilis and beneficial recombinant escherichia coli K-12. The invention further discloses the biological treatment method for municipal sludge. The biological treatment method comprises the following steps: (1) smashing municipal sludge surface, adding the biological agent for treating sludge provided by the invention, watering and turning over materials for performing first fermentation; (2) scattering a compound rhizopus preparation into the material after the first fermentation, performing second fermentation, and then planting pennisetum sinese. According to the biological treatment method for combining microbiological treatment with plant cultivation provided by the invention, organic content can be increased within a short period of time, harmful substances, such as heavy metal, can be degraded, the sludge can be activated, diversity of beneficial microflora in sludge can be increased, a sludge stock dump can be turned into a fertile farmland, and the problem of difficulty in treating municipal sludge can be fundamentally solved.

The embodiment of the invention discloses a sulfuric acid mist elimination method. The method comprises the following steps of absorbing the sulfuric acid mist by adopting solid waste coal ash; and further carrying out alkaline activation and modification on the coal ash by adopting NaOH or CaO as a modifying agent so as to improve the adsorption performance of the coal ash. According to the sulfuric acid mist elimination method, not only is the cost low, but also the adsorptive property is good, an the secondary pollution can be avoided, so that the management problem of the sulfuric acid mist in a lead-acid storage battery plant is solved, and the treatment problem of industrial waste material coal ash is also solved.

The invention discloses an in-situ ecological remediation method for phosphate tailings. The invention firstly discloses a special microbial preparation for disposing phosphate tailings. The microbialpreparation comprises a composite microbial community, a composite organic matter I and a composite organic matter II; the preparation method of the microbial preparation comprises the following steps: sterilizing and cooling the composite organic matter I, and putting the composite organic matter I in the composite microbial community for aerobic fermentation to obtain fermentation liquor; adding water to the composite organic matter II and mixing uniformly; adding the fermentation liquor, mixing uniformly and stacking for aerobic fermentation; and crushing. The invention further discloses the in-situ ecological remediation method for the phosphate tailings. The in-situ ecological remediation method comprises the following steps of: connecting the special microbial preparation for disposing phosphate tailings into a matrix to obtain a microbial matrix; mixing the microbial matrix at the surface layers of the phosphate tailings to realize primary loamification of the surface layers ofthe phosphate tailings; and subsequently planting pennisetum sinese and carrying out regular management. The in-situ ecological remediation method disclosed by the invention implements in-situ ecological remediation of the phosphate tailings by combining microorganisms with plants and can realize loamification of the phosphate tailings and gradually degrade harmful elements contained in the phosphate tailings, thereby fundamentally solving the problem of disposal of the phosphate tailings.

The invention relates to a preventing and treating method for fruit tree decay. The preventing and treating method comprises the following operation steps: preparing a drug, scraping a diseased area for exposing xylem, and then smearing the prepared drug onto the scraped area by using a special tool. The preventing and treating method for fruit tree decay has scientific and reasonable implementation steps and simple and convenient operation and can effectively solve the problem of treating the fruit tree decay. Measures such as physical scraping, chemical smearing and spraying, prevention andcontrol of decay pathogenic bacteria by a bactericide, indirect control of transmission of decay by a pesticide, and the like are utilized in the method, and the measures are comprehensive and in place, so that the tree vigor of fruit trees is indirectly enhanced, the decay is prevented and controlled scientifically and reasonably from the perspective of comprehensive prevention and control, and the prevention effect is obvious. Fruit trees subjected to the prevention and treatment method provided by the invention recover quickly and have a good recovery effect, great significance for plantingand nursing fruit trees is achieved, and the method is worthy of promotion and application.

the present invention provides a method for utilization of waste heat of harmful gas central incineration of coating line, comprising feeding the generated waste gas in a primary coating furnace (2) and an accurate coating furnace (3) into a waste gas incineration furnace (4) to burn; feeding the heat generated by the burning cracking to other place of the product line by classification with a primary heat exchanger (6) and a secondary heat exchanger (7) to satisfy requisition of the product line. Each heat source is shown in the figure 2, heat supply from the waste gas is a fixed value, eachsupply point is equipped with a combustion machine, the temperature requirement is controlled by controlling the heat supply in the combustion machine to satisfy temperature regulation requirement ofthe product line. The invention not only resolves environmental pollution problem, but also fully uses energy source, which resolves heat source supply problem in the coating line production.

The invention discloses a karst stratum tunnel secondary lining renovation construction structure and method based on a sleeve lining. The structure comprises a grouting anchoring structure for supporting a tunnel section arch wall needing to be renovated and a strengthening sleeve lining for strengthening the tunnel section arch wall needing to be renovated. The strengthening sleeve lining is arranged on the inner side of a tunnel secondary lining, and the grouting anchoring structure is arranged on the outer side of the strengthening sleeve lining. The method comprises the steps including the first step of structural steel arch frame installing, the second step of grouting anchoring construction, the third step of tunnel secondary lining inner wall roughening treatment, the fourth step of arch-shaped steel bar structure construction and the fifth step of concrete sleeve lining construction. According to the karst stratum tunnel secondary lining renovation construction structure and method, design is reasonable, construction is simple and convenient, and the usage effect is good; the surrounding rock on the outer side of the tunnel section needing to be renovated is integrally strengthened through the grouting anchoring structure, and the tunnel outer side surrounding rock and the tunnel support structure are fastened and connected into a whole; and meanwhile, the strengthening sleeve lining is arranged in the tunnel secondary lining, the support strength and the support effect of the constructed formed sleeve lining are further effectively improved, and the renovation effect of the tunnel secondary lining is ensured.

Provided is an automatic governance method for low voltage in a distribution network based on an improved ant colony algorithm. The improved ant colony algorithm is applied to the study of the investment cost of distribution network low voltage governance for the first time. That the voltages of all the nodes of a 10kV distribution network reach the normal voltage is taken as a constraint condition, the minimum investment cost of the governance scheme is used as an optimization objective, the ant travel taboo table is limited, and the pheromone updating rule of the basic ant colony algorithm is improved through a best-worst ant system, which improves the convergence speed of the algorithm. Example comparison between the 10kV distribution network governance scheme in the distribution network 'low voltage' governance technical principle (trial) and the algorithm proposed by the invention shows that the algorithm proposed by the invention has economic advantage in low voltage governance and can help to solve the problem of distribution network low voltage governance.

The invention discloses a tunnel second lining remediation method for die cast construction of a lining. The method includes the following steps that firstly, a structural steel arch frame is mounted;secondly, hair cutting treatment is carried out on the inner wall of a tunnel second lining; thirdly, an arched steel bar structure is constructed; and fourthly, die cast construction is conducted onthe concrete lining, die cast construction is carried out on the concrete lining in the longitudinal extension direction of a tunnel from back to front, and the concrete lining is divided into a plurality of lining sections from back to front. According to the method, the design is reasonable, the construction is simple and convenient, the use effect is good, an arched template for carrying out molding construction on a construction lining is formed by splicing seven lining molding templates, meanwhile, assembled scaffolds are adopted, and subsection pouring is carried out on the constructionlining from bottom to top through the arched template; the adopted assembled scaffolds are disassembled and assembled on site simply and conveniently, and the construction efficiency of the lining can be effectively increased; and at the same time, a vault pouring section of the construction lining is poured through a vault pouring structure to ensure the concrete compactness and molding qualityof the vault pouring section, and the secondary remediation effect of the tunnel is ensured.

The invention belongs to the technical field of treatment of industrial mixed sulfates, and particularly relates to a process and device for treating byproduct mixed waste salts containing sodium sulfite and sodium sulfate produced during phenol production. The process includes preparing the byproduct mixed waste salts during phenol production into a homogeneous solution by utilizing water, adjusting the pH value of the solution to 4-6 by utilizing sulfuric acid, adding activated carbon into the solution, performing adsorption, performing ultrasonic comprehensive oxidation after adsorption to promote oxidation of the sodium sulfate in the solution and decomposition of organic matters until the COD of the solution is less than 10 mg / L, subjecting the solution to ultrasonic crystallization to precipitate sodium sulfate crystals, and utilizing the solution repeatedly. The technical device includes an adsorption pretreatment unit, an ultrasonic oxidation unit and an ultrasonic crystallization unit. The process and the device have characteristics of novel process steps, a reasonable structure design of the device, unique treatment manners, high recovered salt purity, good appearance of the recovered salt, and the like, overcome the treatment problem of mixed waste salts and achieve zero-emission of waste water.

The invention discloses a process for preparing manganese chloride tetrahydrate by absorbing waste gas containing chlorine by low-taste rhodochrosite. Powder of the low-taste rhodochrosite is prepared to be ore pulp with water; the ore pulp carries out absorption reaction with the waste gas containing the chlorine; the obtained ore pulp is carried out filtration; manganese sulfate powder and metal manganese powder are sequentially added in the filtrate to carry out the purification and the filtration; after the filtrate is evaporated and crystallized, solid MnCl2 4H2O product is obtained. Compared with the prior art, the invention has simple technological process and is convenient to operate. The invention solves the problem of treating the waste gas containing the chlorine, makes full use of the oxidizability without adding oxidant and can also highly effectively use a large amount of low-taste rhodochrosite resource which is difficult to use, which realizes sustainable utilization of resources and reutilization of secondary resources and has good application prospect in industry. By adopting ways of displacement of the metal manganese powder and reduction of the manganese sulfate when purifying and eliminating heavy metals, the invention not only has obvious effect but also reduces secondary pollution to the product and saves process of secondary impurity removal.

The invention discloses a method for inhibiting the reaction loss of metallic aluminum in the process of extracting aluminum by using an aluminum ash wet method. The method for inhibiting the reaction loss of the metallic aluminum in the process of extracting the aluminum by using the aluminum ash wet method mainly comprises the following steps that mixing and pulping are carried out on aluminum ash and water according to a certain proportion, then the slurry is conveyed into a ball mill for crushing, and a certain amount of additive is added in the crushing process to adjust the property of the slurry, oversize aluminum powder rich in metal aluminum components and undersize slurry low in metal aluminum components are separated from the slurry subjected to ball milling by adopting a screening manner, and after oversize aluminum powder is washed and dried, a metal aluminum powder product is obtained. According to the method for inhibiting the reaction loss of the metallic aluminum in the process of extracting the aluminum by using the aluminum ash wet method, through chemical property adjustment of the slurry in the aluminum ash wet grinding and separation process, the increase of the pH value of the slurry caused by the hydrolysis reaction of aluminum nitride is controlled, the reaction loss of metal aluminum is greatly reduced, and the economical efficiency of wet-process aluminum extraction is improved; and in addition, the process that the metal aluminum participates in the reaction is inhibited, so that the amount of hydrogen generated in the grinding and separation process is greatly reduced, and the operation safety is further greatly improved.

The invention discloses a formula of a preparation for sewage treatment. The formula comprises silicon dioxide, aluminum oxide, calcium oxide, potassium oxide, ferric oxide, magnesium oxide, sodium oxide and titanium dioxide, wherein the silicon dioxide accounts for 66 to 69 percent, the aluminum oxide accounts for 15 to 17 percent, the calcium oxide accounts for 3.5 to 5.5 percent, the potassiumoxide accounts for 2 to 3 percent, the ferric oxide accounts for 3 to 5 percent, the magnesium oxide accounts for 1.5 to 3 percent, the sodium oxide accounts for 0.5 to 1.5 percent, and the titanium dioxide accounts for 0.5 to 1.5 percent. The formula is simple and convenient to use, cannot be affected by an external environment, and can effectively reduce contents of COD (Chemical Oxygen Demand),ammonia nitrogen, total phosphorus, total nitrogen and SS (Suspended Solid) in sewage; decolorization is effectively carried out, the activity of aerobic microorganisms is excited, a bed mud biological system is recovered, a better treatment and control effect on black and odorous water bodies, scattered sewage discharge holes and water bodies having relatively-sealed systems also can be achieved, secondary pollution is effectively avoided, self-adjustment restoration of an aquatic ecosystem is realized, a sewage treatment problem is radically solved, and the cost is low.

An indigo is prepared from anilinoacetonitrile as main raw material, anhydrous K-Na alkali mixture as solvent, and aminosodium as condensating agent through adding potassium sodium (or potassium) anilinoacetate, cyclyzing the potassium sodium anilinoacetate to become the indolol potassium (or sodium) at high temp and pressure, oxidizing, press filtering and drying. Said potassium sodium (or potassium) anilinoacetate as intermediate is prepared through proportionally mixing anilinoacetonitrile with the liquid K-Na alkali mixture or liquid K alkali.

The invention discloses a tower-type ecological purification integrated device for small-town domestic sewage. The tower-type ecological purification integrated device comprises a water storage filtertank, a medium reverse osmosis tank, an amphibious organism reaction system and an aquatic organism reaction system; the amphibious organism reaction system and the aquatic organism reaction system are formed in the mode of being alternately connected from high to low; the amphibious organism reaction system and the aquatic organism reaction system are alternately combined to form a wetting and drying alternation and oxidation-reduction composite environment, and by combining plant intercepting absorbing, biological matrix transformation, exposure to oxygen and enhanced medium adsorbing, a plant-microorganism-animal multistage ecological purification treatment integrated technology and integrated device are formed. Within the small spatial range, efficient purification and standardized discharge of the small-town domestic sewage are realized.

The invention discloses a novel process for plating the surface of a steel casting. The process has the characteristics of simple process, easy control, low cost and excellent plating effect, and has no wastewater drainage at the same time. Pores on the surface of the steel casting needs no repairation before the steel casting is plated, so that the cost is greatly saved.

The invention discloses an outdoor large-scale spat intermediate culture method. The method comprises the following steps that 1) an outdoor shellfish bed is constructed in a pond; 2) a water level height difference is gradually formed among a higher-place pond, an algae pond and the outdoor shellfish bed in the vertical direction, high-density shrimp culture is carried out in the higher-place pond, fish and shrimp mixed culture is carried out in the algae pond, and intermediate culture on spats is carried out in the outdoor shellfish bed; and 3) culture wastewater is purified: the culture wastewater in the higher-place pond is discharged into the algae pond for ectopic dilution and conversion firstly, the wastewater is changed into fertilizer water to promote the growth of beneficial unicellular algae, then the fertilizer water in the algae pond is introduced into the outdoor shellfish bed, the fertilizer water is changed into purified water through the filter feeding activity of bivalve shellfish, and meanwhile, the unicellular algae are used as bait organisms to promote the growth of the spats, so that the culture wastewater is purified in an ex-situ manner. According to the method, the breeding cost is greatly reduced, the productivity of intermediate culture of the spats is greatly improved, high economic benefits are achieved, the problem of treatment of culture wastewater can be effectively solved, and the method is suitable for popularization and application in areas suitable for breeding of bivalve spats such as clams and razor clams.

The invention relates to a sugar refining clarification clean production process which comprises the following steps: firstly, feeding mud juice of a settling pond into a filtering cloth free vacuum suction filtration machine, filtering and separating under the action of the filtering cloth free vacuum suction filtration machine so as to obtain filtrate and filtered mud, using the filtered mud as a raw material of a composite fertilizer or directly supplying to farmers to be used as a base fertilizer, feeding the filtrate into a rapid filtrate settling system, further performing solid-liquid separation under the action of a flocculant, thereby obtaining sugar juice and mud juice, feeding back the obtained mud juice to the filtering cloth free vacuum suction filtration machine for further filtration, feeding the obtained sugar juice into a clear juice tank for treatment, and feeding the treated clear juice into an evaporation tank for evaporation concentration. The sugar refining clarification clean production process has the characteristics of small pollution discharge, low consumption, high efficiency and cost reduction.

The invention provides a governing system for underground water subjected to seawater intrusion, and a construction method of the governing system. According to the conditions of geology, topography,an underground quaternary aquifer and the natural slope of the aquifer from the upstream part of an underground water area to a seawater intrusion water inlet section, a seawater-preventing dike is constructed at a seawater intrusion water inlet, and a plurality of automatic opening-closing valves are distributed on the seawater-preventing dike; and under the condition of the seawater normal waterlevel elevation or tidal wind wave water level elevation, the seawater-preventing dike can thoroughly block a seawater intrusion water inlet channel, thus seawater cannot invade the inner side of theseawater-preventing dike in an intrusion mode, and water on the inner side of the seawater-preventing dike utilizes natural hydraulic kinetic energy generated by upstream underground water of the underground water area through the downstream slope to break through valve plates of the automatic opening-closing valves to be discharged. According to the governing system, the self-cleaning function of a seawater intrusion area is achieved, thus the governing problem of the seawater intrusion area is solved, ecological self-restoration is achieved, the environment is protected, and the cost is saved.

The invention relates to a coal bed methane gas ground treatment method. The problems that coal bed methane gas treatment measures are deficient, and the horizontal well mining efficiency is low are solved. The coal bed methane gas ground treatment method comprises the following steps that the to-be-mined well field range is explored, and the layout routes of a main roadway, a coal mining workingface and roadways on the two sides of the coal mining working face in the mine mining process are preset; the well hole track of a horizontal well is set along the layout routes of the main roadway and the roadways on the two sides; the well hole track of a cluster type horizontal well is set in the coal mining working face between the roadways on the two sides; the horizontal well and the clustertype horizontal well are drilled according to the well hole track of the horizontal well and the well hole track of the cluster type horizontal well respectively, the well walls are reinforced with slurry when the well walls are not stable, and after the wells are formed, shock wave operation is conducted on the horizontal sections of the horizontal well and the horizontal sections of the clustertype horizontal well; and after shock wave operation of all the horizontal sections of the horizontal well and the cluster type horizontal well is completed, the horizontal well and the cluster typehorizontal well are put into drainage.

The invention discloses a method for preparing an environment-friendly plasticizer DOTP from waste white mud, and belongs to the technical field of high-valued cyclic utilization of waste, synthesis of fine chemicals and application of plastic additives. According to the invention, acid-treated waste white mud and 2-ethylhexanol are used as main raw materials, molecular structure transformation and functional group conversion are carried out through esterification, neutralization washing, dealcoholization and decoloration, and the environment-friendly plasticizer DOTP is prepared. The method provided by the invention not only solves the treatment problem of the waste white mud, but also turns waste into wealth, and the obtained product DOTP is listed as a non-toxic plasticizer, can completely replace o-benzene plasticizers, has dual benefits of economy and environmental protection, and is wide in application prospect.

The invention discloses a method for treating gas in a lower section of a coal face. The method comprises the step of pre-pumping gas in a coal seam of the lower section in advance in a long drill hole in a construction section of a transportation roadway of the coal face by using time and space. The problem that in the prior art, gas control is difficult during mine deep mining is solved.