Preparation method of multifunctional repair agent used for governing heavy metal contaminated soil
A technology for polluted soil and remediation agent, applied in the field of soil pollution control, can solve the problems of unscientific chemical ratio, soil fertility damage, long remediation period, etc., and achieve the effects of low cost, enhanced pH buffering capacity, and fast action.
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Embodiment 1
[0022] (1) Mix rice husk powder with a particle size of 50 mesh and attapulgite with a particle size of 150 mesh at a weight ratio of 1:10, take 20 g of the above mixture, and add it to 100 mL of 30% MgCl 2 The solution was stirred continuously and the pH value of the mixture was adjusted to 10 with 1 mol / L NaOH to obtain a precipitate, which was filtered with suction and dried at 105°C. Under the condition of blocking the air, the dried product was roasted at 450°C for 2 hours, and after cooling to room temperature, it was ground into a material A of not less than 100 mesh.
[0023] (2) Take 20g of material A and add it to 100mL nitrogen and phosphorus mixed solution (NH 4 + The concentration is 100mg / L, PO 4 3- 250mg / L), room temperature, 200r / min stirring condition for 4h and then filtered, the filtered solid was dried at 105°C, and ground to a size of not less than 200 mesh to obtain a multifunctional restoration agent.
[0024] Select Cd 2+ Contaminated soil was used...
Embodiment 2
[0026] (1) Mix wheat straw powder with a particle size of 50 mesh and bentonite with a particle size of 200 mesh at a weight ratio of 1:9, take 20 g of the above mixture, and add it to 100 mL of 40% MgCl 2 The solution was stirred continuously and the pH value of the mixture was adjusted to 10 with 1 mol / L NaOH to obtain a precipitate, which was filtered with suction and dried at 105°C. Under the condition of isolated air, the dried product was calcined at 500°C for 1.5h, and after cooling to room temperature, it was ground into material A of not less than 100 mesh.
[0027] (2) Take 20g of material A and add it to 100mL nitrogen and phosphorus mixed solution (NH 4 + The concentration is 120mg / L, PO 4 3- 300mg / L), room temperature, 200r / min under stirring conditions for 6h and then filtered, the filtered solid was dried at 105°C, and ground to a size of not less than 200 mesh to obtain a multifunctional restoration agent.
[0028] Select Pb 2+ Contaminated soil was used a...
Embodiment 3
[0030] (1) Mix corn cob powder with a particle size of 50 mesh and diatomite with a particle size of 200 mesh in a weight ratio of 1:8, take 20 g of the above mixture, and add it to 100 mL of 35% MgCl 2 The solution was stirred continuously and the pH value of the mixture was adjusted to 10 with 1 mol / L NaOH to obtain a precipitate, which was filtered with suction and dried at 105°C. Under the condition of isolated air, the dried product was roasted at 550°C for 3 hours, and after cooling to room temperature, it was ground into a material A of not less than 100 mesh.
[0031] (2) Take 20g of material A and add it to 100mL nitrogen and phosphorus mixed solution (NH 4 + The concentration is 150mg / L, PO 4 3- 320mg / L), room temperature, 200r / min stirring condition for 4h and then filtered, the filtered solid was dried at 105°C, and ground to a size of not less than 200 mesh to obtain a multifunctional restoration agent.
[0032] Select Cr 3+ Contaminated soil was used as the ...
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