Passivating agent for weakly acidic cadmium contaminated soil and application thereof
A technology of cadmium-contaminated soil and passivating agent, which is applied in the restoration, application, soil conditioning materials and other directions of polluted soil, can solve the problem of increasing cadmium content, difficult to guarantee the long-term effectiveness of passivating agent, and invariable change of extractable cadmium content. Obvious and other problems to achieve the effect of improving stability and satisfying efficient and fast repair
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[0040] Example 1 Preparation of passivating agent ND-1
[0041] (1) Take 100g of straw biochar prepared at 300°C, grind and crush, and pass through an 80-mesh nylon sieve;
[0042] (2) Soak the biochar in a mixed solution of 1mol / L sodium sulfide and 10% sulfuric acid for 3 hours, and the mass ratio of biochar to the mixed solution is 1:3;
[0043] (3) Put the above-mentioned mixed system after soaking in an ultrasonic cleaning machine, ultrasonic reaction for 20min, ultrasonic power is 400W; then place the reaction system in a microwave chemical reactor for microwave reaction for 10min, microwave power 600W;
[0044] (4) Separate the biological carbon from the mixed solution by suction filtration in the mixed system completed by the microwave reaction, wash the biological carbon to neutrality with deionized water, and dry it in an oven at 70°C to obtain modified carbon;
[0045] (5) Mix the purchased calcium oxide, fly ash, calcium-magnesium phosphate fertilizer, and beneficial soil si...
Example Embodiment
[0047] Example 2 Preparation of passivating agent ND-2
[0048] (1) Take 100g of straw biochar with a preparation temperature of 400℃, grind and crush, and pass through a 100-mesh nylon sieve:
[0049] (2) Soak the biochar in a mixed solution of 1mol / L sodium sulfide and 10% sulfuric acid for 4 hours, and the mass ratio of biochar to the mixed solution is 1:4;
[0050] (3) Put the immersed mixed system in an ultrasonic cleaning machine, ultrasonic reaction for 25min, ultrasonic power is 600W; then place the reaction system in a microwave chemical reactor for microwave reaction for 15min, microwave power 800W;
[0051] (4) Separate the biochar from the mixed solution by suction filtration in the mixed system after the microwave reaction, wash the biochar to neutrality with deionized water, and dry it in an oven at 70°C to obtain the modified biochar;
[0052] (5) Mix the purchased calcium oxide, fly ash, calcium-magnesium phosphate fertilizer, and beneficial soil silicon fertilizer in a ...
Example Embodiment
[0054] Example 3 Preparation of passivating agent ND-3
[0055] (1) Take 100g of straw biochar whose preparation temperature is about 500℃, grind and crush it, and pass it through a 100-mesh nylon screen;
[0056] (2) Soak the biochar in a mixed solution of 1mol / L sodium sulfide and 10% sulfuric acid for 5 hours, and the mass ratio of the biochar to the mixed solution is 1:5;
[0057] (3) Put the above-mentioned mixed system in an ultrasonic cleaning machine, ultrasonic reaction for 30 minutes, the ultrasonic power is 800W; then place the reaction system in a microwave chemical reactor for microwave reaction for 20 minutes, the microwave power is 1000W;
[0058] (4) Separate the biochar from the mixed solution by suction filtration in the mixed system after the microwave reaction, wash the biochar to neutrality with deionized water, and dry it in an oven at 70°C to obtain the modified biochar;
[0059] (5) Mix the purchased calcium oxide, fly ash, calcium-magnesium phosphate fertilizer,...
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