Composite soil conditioner for treating Cd pollution, and preparation and use methods thereof

[0034] A method for preparing a composite soil conditioner for treating heavy metal Cd pollution, comprising the following steps: fully stirring clay minerals, peat, biochar, slaked lime and iron oxide until uniformly mixed; adding microbial bacterial agents by 5-10% , made of inorganic-organic composite conditioner.

[0035] The clay minerals are mainly kaolinite, montmorillonite and illite, which are crushed and passed through a 40-mesh sieve for later use. The kaolin mentioned above should meet the requirements of GB / T14563-2008, and the montmorillonite and illite should meet the requirements of GB / T14563-2008.

[0036] The organic matter content in the peat is mostly 40-70%, and the pH value is 6.0-7.0, which is pulverized by a pulverizer and passed through a 40-mesh sieve for later use.

[0037] The slaked lime is a strong alkaline substance produced by limestone through processes such as calcination, digestion, separation and deslagging, and centrifugal dehydration. The...

[0045] Embodiment 1: The preparation of the compound soil conditioner that is used to control heavy metal Cd pollution

[0046] Clay minerals, peat, biochar, humic acid and slaked lime are pulverized by a pulverizer, sieved with 40 meshes, fully stirred until mixed evenly, and microbial bacterial agents are added in a proportion of 5%. Among them, the addition ratio of clay minerals, peat, biochar, slaked lime and iron oxide is 25:15:15:30:10.

[0047] The clay minerals are mainly kaolinite, which is crushed and passed through a 40-mesh sieve for later use. The kaolinite should meet the requirements of GB / T14563-2008.

[0048] The peat has an organic matter content of 60% and a pH value of 7.0, which is pulverized by a pulverizer and passed through a 40-mesh sieve for later use.

[0049] The slaked lime is a strong alkaline substance produced by limestone through processes such as calcination, digestion, separation and deslagging, and centrifugal dehydration. The main compon...

[0051] Embodiment 2: be used for the preparation of the compound soil conditioner of controlling heavy metal Cd pollution

[0052] Clay minerals, peat, biochar, humic acid and slaked lime are pulverized by a pulverizer, sieved with 40 meshes, fully stirred until mixed evenly, and microbial bacterial agents are added in a proportion of 5%. Among them, the addition ratios of clay minerals, peat, biochar, slaked lime and iron oxides are 20:15:15:35:5, respectively.

[0053] Clay minerals are selected from montmorillonite, crushed and sieved with 40 meshes for later use. The montmorillonite meets the requirements of GB / T14563-2008.

[0054] The organic matter content in the peat is 50%, the pH value is 6.5, it is pulverized by a pulverizer and passed through a 40-mesh sieve for later use.

[0055] The slaked lime is a strong alkaline substance produced by limestone through processes such as calcination, digestion, separation and deslagging, and centrifugal dehydration. The main ...