254results about How to "Meet the needs of actual production" patented technology

The invention belongs to the field of chemical catalysts, and specifically relates to a high-activity iron-based low-temperature Fischer-Tropsch synthesis catalyst and a preparation method thereof. The low-temperature Fischer-Tropsch synthesis iron-based catalyst is prepared by subjecting a skeleton iron material to low-temperature carbonization at a low temperature under a high carbon monoxide partial pressure and contains high-activity epsilon-Fe2C nano particles. The provided Fischer-Tropsch synthesis catalyst has an extremely high catalytic activity at a low temperature (less than 200 DEG C), wherein the catalytic activity is prominently higher than that of reported low-temperature iron-based Fischer-Tropsch synthesis catalysts. At the same time, the stability of the provided catalyst is high, and thus the catalyst can meet the production requirements.

A method for planning an operation point sequence and a path of an industrial robot based on a swarm intelligence algorithm mainly solves the problem that a method for planning an operation point sequence and a path of an industrial robot in the prior art is low in automation degree and poor in scientific rationality. According to the method of the present invention, a discrete sequence similarity index (SD) is used for representing the difference (distance) between individuals in planning of the sequence; a collision evaluation index (O) is constructed for avoiding collision between the industrial robot and a barrier as well as between joint rods of the robot; for a constraint condition, a penalty function is adopted for performing processing, and a constraint penalty term C is introduced, so that dynamic characteristics of the industrial robot meet margin requirements. The method of the present invention obtains the optimal operation point sequence of the industrial robot and the corresponding optimal path based on the above evaluation indexes and an improved swarm intelligence algorithm, can effectively improve execution efficiency and operation performance of the industrial robot, can reduce cost, and can meet requirements of actual production.

The present invention relates to preparation process of carbon-doped mesoporous TiO2 visible light catalyst, and belongs to the field of nanometer catalyst material technology. The present invention features that amorphous titania powder prepared with titanium containing compound through hydrolysis and used as the titanium source and saccharide compound as carbon source are produced into the carbon-doped mesoporous TiO2 visible light catalyst through heat treatment in water or solvent, suction filtering, washing and drying. The carbon-doped mesoporous TiO2 visible light catalyst has specific surface area up to 126 sq m / g, homogeneous pore size of about 8 nm, high visible light catalytic activity, simple synthesis path and easy control of the technological process.

The invention discloses a high speed railway catenary fault diagnosis method based on a deep convolution neural network. The method comprises the following steps: the two-dimensional gray scale image of a high speed railway catenary supporting device is acquired; the deep convolution neural network is pre-trained through a catenary training set, the deep convolution neural network is put to a faster RCNN for training, an equipotential line in the two-dimensional gray scale image is extracted through a trained model and is segmented, and an equipotential line region picture is acquired; and the acquired equipotential line region picture is sequentially subjected to the following processing: the brightness and the contrast are adjusted; recursive Otsu presegmentation is carried out; and ICM / MPM (Iteration condition model / maximization of the posterior marginal) is used to segment and corrode and expand the picture, equipotential line pixel points are obtained, the maximum connected domain is extracted, and the number N of independent connected domains in the equipotential line pixel point region is counted; and if N is larger than m, separable strand fault is judged to happen to the part of the equipotential line. The equipotential line can be accurately positioned, the fault diagnosis accuracy is improved, and the actual production needs are met.

The invention relates to a macromolecular / metal (metal alloy) composite conductor and a manufacture method thereof. The composite conductor is provided with a skin layer and a core layer, wherein the skin layer is thermoplasticity macromolecular polymer (A), the core layer is a metal alloy (B) with lowi melting point, and the cross section of fiber can be round or irregular. The manufacture method is a complex extrusion method and comprises the steps of preparing a fusant, extruding and postprocessing, wherein a complex extrusion die head is adopted. The composite conductor of the invention has excellent electric conductivity, and the volume specific resistance is 1.0*10<-6>-1.0*100 omega cm. Therefore, the composite conductor can satisfy the requirement on clothes conductors by the clothes industry and can be applied for detective textiles, such as special uniforms, textile soft keyboards, intelligent clothes, intelligent bandages and the like. Because the composite structure of the skin layer and the core layer is adopted, the composite conductor of the invention has excellence in clothes production, has soft handfeel, and can satisfy requirements on color and comfort level by clothes textile in addition to satisfying electric conductivity requirements, and meanwhile, product cost is greatly lowered.

The invention relates to titanium dioxide powder with ultrahigh water dispersion and high photocatalytic activity and a preparation method thereof. The method comprises the following steps: adding titanium salt in alcohol solvent to prepare precursor, performing low-temperature non-aqueous solvent heat treatment to the precursor, washing the product with ethanol, centrifuging, and drying to obtain titanium dioxide powder with ultrahigh water dispersion and high photocatalytic activity. The obtained titanium dioxide belongs to anatase polycrystal and consists of 5-10nm of particles; the isoelectric point of titanium dioxide is 6.3; when the pH value is less than 5 or more than 6.5, the absolute value of the Zeta potential is more than 30 millivolts; the weight percentage of titanium dioxide is 0.1%-50%, the aqueous dispersion can remain stable for at least 48 hours; and the pollutants can be completely degraded in 1 hour under the simulated sunlight. The method of the invention has simple synthetic route, controllable technological process, low reaction temperature, accessible raw materials, low cost and high yield which is up to 97% and is suitable for industrial mass production.

The invention relates to a method for preparing ferroferric oxide nano-piece through a microwave method, which belongs to the field of preparation of nano-material through a wet chemical method. The method comprises the following steps of: preparing a ferric salt solution by using ethylene glycol by using a soluble trivalent ferric salt as a raw material , adding the sodium acetate and a surfactant in the ferric salt solution, evenly stirring, and irradiating by using microwave to generate ferroferric oxide, filtering and washing the product, drying the product at a constant temperature in air to obtain the ferroferric oxide nano-piece material. The ferroferric oxide nano-piece material synthesized by the method has a thickness of 100nm below as well as the length and width of 1-10microns. The invention has the advantages of high purity of the prepared ferroferric oxide nano-piece, simple synthetic line, short period of microwave reaction of only tens of minute and easy control of the whole process, meets the demands of practical production, and has god application prospect in the fields of catalysis, biological medicine, energy and environment and the like.

The invention discloses a visible-light-induced photocatalyst Bi4O5Br2 and a preparation method thereof. According to the visible-light-induced photocatalyst Bi4O5Br2 and the preparation method thereof, an improved low-temperature hydrothermal method is adopted, composition of Bi, O and Br in BiOX is controlled by controlling amount of a bismuth source and a bromine source, and a novel layered-cake-shaped visible-light-induced photocatalyst Bi4O5Br2 is prepared successfully. The preparation method is simple in production process, easy to operate, low in synthesis temperature, high in reaction yield, environment-friendly and low in cost and meets the requirement of actual production, the reaction yield is 92%, and raw materials are easy to obtain. The visible-light-induced photocatalyst has good visible-light catalytic activity, can completely degrade various organic pollutants such as rhodamine b, methyl orange and methylene blue in short time under the visible light irradiation, is small in light corrosion and good in reusability, can be applied to industrial production and particularly has a better application value in organic pollutant degradation through solar photocatalysis, and the market potential is large.

The invention discloses a stamping die of a side flanging of an automobile cover. The stamping die comprises an upper die base, a lower die base, a presser arranged on the upper die base, a wedge slide block and a flanging cutter block. A wedge installing seat provided with an arc groove at the upper middle part is arranged on the middle right part of the lower die base; the right upper part of the wedge installing seat is provided with a first wedge fixed seat, and the left upper part thereof is provided with a second wedge fixed seat; a groove at the upper part of a rotary wedge corresponds to the lower part of the wedge slide block, and the right part, the left part and the lower part of the rotary wedge respectively correspond to / contact with the left part of the first wedge fixed seat, the right part of the second wedge fixed seat and the upper middle part of the wedge installing seat; and one guide plate is arranged on the right side wall of the groove at the upper part of the rotary wedge, and the left side corresponds to / is in contact with the right side of the lower part of the wedge slide block. The stamping die of the side flanging of the automobile cover has the advantages of compact structure, convenient installation, small size, flexible and stable action and low manufacturing cost.

The invention belongs to the technical field of numerical control machine tool cutter wear monitoring, and particularly discloses a numerical control machine tool cutter wear monitoring method based on deep learning. The method comprises following steps that a three-phase current signal of a numerical control machine tool spindle motor is collected, a current signal corresponding to a cutter to bemonitored is cut out from the three-phase current signal, the current signal is segmented and is divided into M segments of current signals, and root-mean-square value of each segment of current signal can be calculated; each segment of current signal is subject to structured treatment, the structured current signals are input into a sparse automatic coding network to be trained, and a final coding vector obtained after training each time serves as a feature vector output; K value between feature vectors is calculated, and according to the K value, a K value fitted curve is obtained, and according to the K value fitted curve, monitoring of the cutter wear is achieved. Various cutter wear states under different machining conditions can be rapidly and accurately recognized, and the beneficial effects of being high in monitoring and diagnosis precision, high in monitoring real-time performance and high in adaptation are achieved.

The invention relates to an iron group fischer-tropsch synthesis catalyst and its preparation method. The iron group fischer-tropsch synthesis catalyst comprises the components of Fe, Cu, K, Li and SiO2 with weight proportion of 100:0.1-15:0.1-10:0.05-10:2-50. On the premise of good fischer-tropsch synthesis activity and methane selectivity, the iron group fischer-tropsch synthesis catalyst is capable of reducing water gas shift reaction activity in a system and enhancing the effective utilization rate of CO reaction gas.

The invention discloses sorting technology for a coarse coal slurry damping pulsation interference bed. The sorting technology is formed by the mutual connection of an interference bed sorter, a feeding system, a peristaltic pump, a cleaned coal recovering system, and a water pump, and is characterized in that the inside of the interference bed sorter is added with a plurality of damping blocks and screens; the middle part of the interference bed sorter is connected with the feeding system to form a stable fluid bed; simultaneously, a diaphragm is additionally arranged on the lower part of the interference bed sorter and the upper part of a heavy product discharge port to generate a pulsating flow, so that particles with different densities gain the accelerating effect and retarding effect, and the leading action of the density on the separation effect is strengthened; the peristaltic pump is used for discharging heavy products, so that the processing capability of the equipment is improved; under the conditions of wide particle size range of the coarse coal slurry and heavy processing load, the good separation effect and high separation efficiency can also be achieved by the separation process.

The invention relates to a kind of stainless steel spectrum standard sample, especially the spectrum standard sample used to detect the coinage stainless steel and the manufacturing method. It computes the each material additive quantity according to the formula based on the impurity element C, Si, Mn, P, S and additive element B, Ni, Cu, Cr; Fe is the base material. The material is added into the vacuum induction smelting furnace to cast. When the material is smelted to 95%, the sample is analyzed; then it adjust the steel liquid chemical component according to the analyzing result; it adjusts the Si content using the ferrosilicium when 7-10min before tapping; the ferroboron is pre-added into the steel ingot mould; after each element meeting the request, it controls the tapping temperature: 1520-1540deg.C, the steel liquid is poured into the steel ingot mould, after cooling, the sample number is printing on. The spectrum standard has the good uniformity, wide compound content and many element kinds; the process is advance and the value is accurate; the content grads are in reason. So it is better than the other same sample in analyzing the coinage stainless material.

The invention relates to a ferrite nanometer superstructure porous material and a method for preparing the same, in particular to a method for preparing a nickel ferrite, cobalt ferrite or zinc ferrite nanometer superstructure porous material. The preparation method comprises that: sodium oxalate is used as a precipitator, the soluble nickel, cobalt or zinc salt used as a raw material reacts with the soluble iron salt to prepare a precursor of oxalate, and the precursor is degraded by calcination at certain temperature to obtain the nickel ferrite, cobalt ferrite or zinc ferrite nanometer superstructure porous material. The nickel ferrite, cobalt ferrite or zinc ferrite nanometer superstructure porous material synthesized by the method has the advantages of high purity, uniform size, good dispersibility, mild reaction conditions, simple equipment, easily controlled process conditions and low cost, and meets the need of the actual production.

The present invention discloses a method for building facade damage detection in an oblique aerial image. The method comprises the steps of: 1, using a k-means clustering algorithm based on a rough set theory to divide a building facade to obtain doors and windows of the building facade; 2, using a canny algorithm to perform edge detection on the doors and windows of the building facade to obtain edge features of the doors and windows; 3, using a Gini coefficient in economics to perform statistics on the edge features to obtain a Gini coefficient of the building facade; and 4, determining whether the building facade is broken according to the Gini coefficient. The method for building facade damage detection in the oblique aerial image is capable of easily and efficiently performing damage detection on the building facade without the need for prior information and pre-disaster data, thereby lowering the complexity of the method and reducing the production cost. The Gini coefficient in economics is introduced as an index for building facade damage detection, and structural features of the building facade can be made full use of to determine damage, thereby providing a solution for improving the precision and automation of building damage evaluation.

The invention relates to visible light active boron-nickel co-doped titanium dioxide solid solution catalyst and a preparation method thereof. The method uses titanium tetrachloride, boron-containing compound and soluble nickel salt as raw materials to prepare the material of the visible light active boron-nickel co-doped titanium dioxide solid solution catalyst by a spray pyrogenation method at a temperature of between 500 and 700 DEG C. The boron-nickel co-doped titanium dioxide solid solution synthesized by the method has high purity, good dispersion, has higher visible light photocatalystic activity, and can be particularly used in the field of environmental pollution treatment. The method has simple process, easily-controlled condition, lower requirement on equipment and low cost, and is convenient for further enlargement of production.

The invention provides a visible light photocatalyst Bi12O17Cl2 and a preparation method of the photocatalyst. The preparation method comprises the following steps of: dissolving bismuth nitrate pentahydrate and potassium chloride in water to prepare a mixed solution, wherein the molar ratio of bismuth nitrate pentahydrate to potassium chloride is 1:1; and adjusting the pH value of the mixed solution to 12.5-13, then carrying out hydrothermal treatment at 160-180 DEG C on the solution to obtain a solid product, and washing and drying the solid product to obtain the Bi12O17Cl2 product, which is nano sheets with length of a few hundreds of nanometers and width of a few hundreds of nanometers. Under the irradiation of visible light, the photocatalyst can realize that more than 99.5% and approximate 100% of target pollutant pentachlorophenol is degraded within 45 minutes. The method is simple in synthetic route, easy in whole process control, easy in raw material obtaining, low in cost, and high in yield (up to 90%), and is suitable for industrial large-scale production.

The invention relates to a method for determining rock electricity parameter m and n values of a digitalized core, which comprises the following steps of: performing quick nuclear magnetic measurement and calculation on the selected core to obtain nuclear magnetic T2 spectrum and porosity core digitalized data volume; calculating a cementation index m and a saturation index n through a formula respectively; and substituting a logging calculation stratum porosity of an un-cored well field into the established function relations of the cementation index and the saturation index respectively to obtain a cementation index m value and a saturation index n value of the un-cored well field. The method can quickly solve the m and n values, can reach the experimental test effects of the laboratorial conventional standard flow experiments and calculation and acquisition, solves the problem that the rock electricity parameter m and n values cannot be acquired in short time in a laboratory, is convenient and quick to solve, can timely serve or meet the requirements of actual production, and has good application effect.

The invention provides a polycrystalline quartz ceramic crucible and a preparation method thereof; a coating is arranged on the inner wall of the polycrystalline quartz ceramic crucible provided by the invention; and the coating comprises quartz sand, the particle diameter of which is 10-150mu m. According to the invention, polycrystalline silicon ingot casting is carried out by adopting the quartz ceramic crucible having the quartz sand coating with the particle diameter of 10-150mu m; diffusion of impurity elements in the quartz ceramic crucible to the interior of a silicon ingot can be effectively reduced; the minority carrier lifetime of the silicon ingot is increased; the red-zone width of the silicon ingot is reduced; the EL (Electro Luminescence) detection black margin proportion after a silicon slice is prepared into a battery piece is reduced; the photoelectric conversion efficiency is increased; therefore, the quartz ceramic crucible can satisfy practical production requirements better; and experimental results show that the red-zone width of the polycrystalline cast ingot prepared by adopting the polycrystalline quartz ceramic crucible provided by the invention can be decreased to be below 10 mm, even 0 mm.

The invention discloses a method for preparing a self-hardening furan resin for casting and mother liquor. Acetone, phenol, solid formaldehyde, urea and furfuryl alcohol are used as raw materials to be subjected to an addition reaction, a polycondensation reaction and other steps to prepare the furan resin mother liquor. The mother liquor and the furfuryl alcohol with substantially adjustable amount are matched with an enhancer to be stirred conventionally to obtain the self-hardening furan resin for casting. According to the preparation method of the self-hardening furan resin for casting, the preparation process is quick and simple, the production efficiency is high, the labor intensity is low, the furfuryl alcohol content of the resin has strong controllability and wider adjustment range, and is suitable for preparing industrially applied high furan resins, medium furan resins and low furan resins, and thus the method is suitable for industrial popularization and application.

The invention provides a non-hydrolytic sol-gel method for preparing high-dispersity nano alumina, which comprises the following steps of: preparing a precursor by mixing an aluminum salt with an alcoholic solvent, heat-treating the prepared precursor by using a low-temperature non-aqueous solvent, washing the product with ethanol, centrifuging and then drying to obtain the powder body of the nano alumina with high dispersity. The nano alumina has small particle sizes which are distributed evenly, and can be stably dispersed in water. In the whole producing process, the raw materials are easy to get, the operation is simple, no minute and complicated sample after-treatment processes exist, the reaction yield reaches up to 98%, the industrial amplification factor is small, and thus the industrial production of the high-dispersity nano alumina can be realized.

The invention discloses an aviation image building damage detection method based on shadow and texture characteristics, and the method comprises the steps: estimating a theoretical shadow area of a building in an image through the vector data and altitude data of the building before damages and a solar altitude angle; carrying out the detection of an actual shadow in the theoretical shadow area through employing constrained color invariance; obtaining the actual shadow area of the building; obtaining the damage level of the building according to the proportional relation of the actual shadow area and the theoretical shadow area, and dividing the damage level into three levels: complete damage, general damage, and suspected intactness; detecting the top surface of the intact building through employing a vision bag-of-word model, and further judging whether the building is damaged or not. The method integrates the shadow information (height) and top surface information (texture) of the building for detection, avoids registering difficulties in conventional data fusion, and improves the detection accuracy of the damage of the building.

Provided are a visible-light catalyst Bi3O4Br and a preparation method thereof. The method comprises adding deionized water, bismuth salt and quaternary ammonium salt into a reaction kettle to obtain the bismuth salt with concentration of 0.02-0.04 molar / liter and the quaternary ammonium salt with concentration of 0.02-0.05 molar / liter, wherein the molar ratio of the bismuth salt to the quaternary ammonium salt is larger than or equal to one; adding caustic soda solution with concentration of 1 molar / liter into the mixture with stirring to regulate potential of hydrogen (pH) to be 11.0-12.5; stirring and performing hydro-thermal treatment at the treatment temperature of 160-180 DEG C; after keeping the constant temperate for 12-18 hours, centrifugally separating solid products; respectively washing the obtained solid products through the deionized water and absolute ethyl alcohol for at least three times; and drying the products at the temperature of 50 DEG C for at least 6 hours to obtain light-yellow Bi3O4Br solid powder. The Bi3O4Br has good visible-light activity and can have strong degradation to various pollutants under the irradiation of the visible light. In addition, the method is simple in synthesis, the whole synthesis process is easy to control, raw materials are easily obtained, and the cost is low.

The present invention relates to preparation process of carbon-doped mesoporous TiO2 visible light catalyst, and belongs to the field of nanometer catalyst material technology. The present invention features that amorphous titania powder prepared with titanium containing compound through hydrolysis and used as the titanium source and saccharide compound as carbon source are produced into the carbon-doped mesoporous TiO2 visible light catalyst through heat treatment in water or solvent, suction filtering, washing and drying. The carbon-doped mesoporous TiO2 visible light catalyst has specific surface area up to 126 sq m / g, homogeneous pore size of about 8 nm, high visible light catalytic activity, simple synthesis path and easy control of the technological process.

The invention discloses a tool breakage monitoring method based on an SAEs and K-means. The method comprises the following steps: 1, collecting a current signal sample set; 2, inputting current signals subjected to arrangement treatment into the SAEs as an input sample set, reconstructing and extracting features of original current signals, and outputting an encoding vector which is last obtained through SAEs training as a feature vector; 3, treating the feature vector as an input layer of K-means clustering, and classifying all input data; 4, outputting a sample clustering result, and conducting fine adjustment on K-means parameters and SAEs parameters according to a clustering effect; and 5, outputting the clustering effect, and judging whether a tool is broken or not according to the clustering effect.

The invention discloses a multilevel energy-saving drying spiral sieve. The multilevel energy-saving drying spiral sieve comprises a sealed barrel, a foundation column, an adjusting-controlling motor, a support and an air blower. A lug seat on the outer wall of the sealed barrel is installed on the foundation column. A microwave generator and an electric heater are installed on the outer wall of the sealed barrel. A rotary shaft connected with the adjusting-controlling motor is arranged between shaft seats in the sealed barrel. A feed hopper with a baffle, and an air outlet pipe with a filter screen are installed at the top end of the sealed barrel. A check valve on the air outlet pipe is connected in the middle of the side wall of the sealed barrel through a heat recovery pipe. A spiral sieve body is arranged between each of three layers of spiral frames and the rotary shaft. The side wall and the bottom end of the sealed barrel are provided with discharge plates and discharge pipes correspondingly, and the discharge plates and the discharge pipes are each provided with a vibrator. Four layers of conveyer belts are installed on the part, close to the foundation column, of the support. The air blower is communicated with the electric heater and the sealed barrel through pipelines. The multilevel energy-saving drying spiral sieve is simple in structure, reasonable in design, good in sealing effect, capable of screening out materials with different grain sizes and meeting the need of actual production, good in screening effect, high in work efficiency and good in energy-saving effect and has a drying function.

The invention discloses a phosphate rock flotation collector. The phosphate rock flotation collector comprises, by weight ratio, 20-70 parts of Y and 30-80 parts of S; the Y comprises, by weight ratio, 60-30 parts of lauryl amine, 20-40 parts of mixed amine and 20-30 parts of hydrochloric acid; the S comprises, by weight ratio, 20-40 parts of oleic acid, 20-40 parts of phenmethyl hydroximic acid, 20-30 parts of caustic soda and 10-20 parts of sulfuric acid. The invention further discloses a preparation method of the phosphate rock flotation collector. The phosphate rock flotation collector and the preparation method have the beneficial effects that the selectivity and the collecting property are strong, the flotation time is short, the interference caused by other ions in pulp is small, the technological operation is simple, and the economic benefit is remarkable; the grade of P2O5 can be improved by about 5%, and the phosphorus comprehensive recovery rate can be improved by about 10%; poisonous and side effects do not exist, pollution to the environment can be avoided; and the raw material source channels are convenient, and the preparation method is simple.

The invention discloses an active-disturbance-rejection controller, system and method for main steam temperature cascade of a thermal power plant. The controller comprises a tracking differentiator, an expansion state observer, nonlinear state error feedback and three operation units. The system comprises a subsidiary controller, an executor, a subsidiary controlled object, a main controlled object, a subsidiary transmitter and a main transmitter. According to the method, the influence of disturbance factors such as loads and injection flow can be effectively overcome through the specific disturbance compensation effect of the active-disturbance-rejection control system. The active-disturbance-rejection controller, system and method integrate the advantage of cascade control and the advantage of network control and further have the advantage of the active-disturbance-rejection control system; the active-disturbance-rejection controller, system and method have great advantages in the aspect of model disturbance estimation, and with the help of the nonlinear error control law specifically for nonlinear objects, good control precision is still achieved even if control conditions are quite severe, and the adjustment quality is improved; and accordingly, the requirements of practical production are better met.

The invention provides a bismuth oxychloride catalyst with a visible light response core-shell structure and a preparation method thereof. The preparation method comprises the steps of adding bismuth nitrate pentahydrate into mixed solution of ethylene glycol and polyvinylpyrrolidone, performing stirring at room temperature until bismuth nitrate pentahydrate is fully dissolved; using sodium carbonate to adjust the pH of the solution; after the stirring at room temperature, pouring the solution into a reaction kettle to perform reaction; and after the solution is cooled, performing filtration, washing and drying, so that a bismuth oxychloride microsphere with a core-shell structure having a diameter of about 1 [mu]m is obtained. Under irradiation of visible light, the catalyst achieves complete degradation of target pollutant Rhodamine B dye in 10 min. According to the method, a synthetic route is simple, and the catalyst is high in yield, good in reproducibility, high in catalysis effect and repeated utilization factor and suitable for industrial mass production requirements.

The invention provides a preparation method of a spherical Bi3O4Cl / BiOCl (bismuth-based oxychloride / bismuth oxychloride) visible light catalyst. The preparation method specifically comprises the following steps of respectively adding bismuth nitrate pentahydrate and sodium chloride into mixing liquid of ethylene glycol and polyvinylpyrrolidone, and stirring at the room temperature until the bismuth nitrate pentahydrate and sodium chloride are completely dissolved; adjusting the pH (potential of hydrogen) value of the solution by sodium carbonate, and continuing to stir for 30min at room temperature after the pH value is stabilized; adding a reaction matter and urea into a reaction kettle, and reacting for 6h at the temperature of 100 to 200 DEG C; cooling, filtering, washing, and drying, so as to obtain a Bi3O4Cl / BiOCl microsphere with diameter of about 1 to 2mum. The preparation method has the advantages that the visible light can be well absorbed by the catalyst, and rhodamine dye B can be completely dissolved after 10min; the preparation method is simple, the implementing is easy, the reproducibility is good, the prepared catalyst has stable structure, high catalytic efficiency and high repeated utilization rate, and the preparation method is suitable for meeting the requirements of industrial large-batch production.