A kind of preparation method of multifunctional remediation agent for the treatment of heavy metal polluted soil
A technology of contaminated soil and remediation agent, which is applied in the field of soil pollution control, can solve the problems of unscientific proportion of agents, destruction of soil fertility, and long repair 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 isolated air, the dried product was roasted at 450°C for 2 h, and after cooling to room temperature, it was ground into 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 100 mg / 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 as the s...
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 roasted at 500°C for 1.5 h, and after cooling to room temperature, it was ground into a 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 120 mg / 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 use...
Embodiment 3
[0030] (1) Mix corncob powder with a particle size of 50 mesh and diatomite with a particle size of 200 mesh at 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 calcined at 550°C for 3 h, and after cooling to room temperature, it was ground into 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 150 mg / 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 sampl...
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