Passivator for remediation of farmland soil subjected to combined pollution of heavy metals, and preparation method and use method of passivator
A compound pollution and passivating agent technology, applied in chemical instruments and methods, restoration of polluted soil, soil conditioning materials, etc., can solve the problem of unseen farmland restoration research, increased content of ionic heavy metals, and unrealistic large-scale promotion and other issues, to achieve long-term and stable passivation effect, reduce the effective content of heavy metals, and not produce secondary pollution
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Embodiment 1
[0046] A passivating agent for remediation of complex pollution of heavy metals in farmland soil including cadmium, chromium, copper and nickel, including passivating agent A and passivating agent B;
[0047] Passivator A includes montmorillonite, diatomite, sepiolite, illite and ferrous sulfate; the mass ratio of montmorillonite, diatomite, sepiolite, illite and ferrous sulfate is 0.4:1.0:0.2 : 0.5:0.6; Passivator B includes periclase, calcite, calcium magnesium phosphate fertilizer, plant ash and calcium hydroxide; the mass ratio of the periclase, calcite, calcium magnesium phosphate fertilizer, plant ash and calcium hydroxide is 0.2:0.8 :0.5:0.3:2.5.
[0048] The preparation method of the above-mentioned passivating agent is: grinding and crushing montmorillonite, diatomite, sepiolite and illite to pass through a 100 mesh sieve, and grinding the ground montmorillonite, diatomite, sepiolite, Illite and ferrous sulfate are mixed to obtain Passivator A;
[0049] Grinding and...
Embodiment 2
[0051] A passivating agent for remediation of complex pollution of heavy metals in farmland soil including cadmium, chromium, copper and nickel, including passivating agent A and passivating agent B;
[0052] Passivator A includes montmorillonite, diatomite, sepiolite, illite and ferrous sulfate; the mass ratio of montmorillonite, diatomite, sepiolite, illite and ferrous sulfate is 1.0:0.8:0.2 : 0.5: 2.2; Passivator B includes periclase, calcite, calcium magnesium phosphate fertilizer, plant ash and calcium hydroxide; the mass ratio of the periclase, calcite, calcium magnesium phosphate fertilizer, plant ash and calcium hydroxide is 1.1:1.0 :1.3:0.8:0.4.
[0053] The preparation method of the above-mentioned passivating agent is: grinding and crushing montmorillonite, diatomite, sepiolite and illite to pass through a 100 mesh sieve, and grinding the ground montmorillonite, diatomite, sepiolite, Illite and ferrous sulfate are mixed to obtain Passivator A;
[0054] Grinding an...
Embodiment 3
[0056] A passivating agent for remediation of complex pollution of heavy metals in farmland soil including cadmium, chromium, copper and nickel, including passivating agent A and passivating agent B;
[0057] Passivator A includes montmorillonite, diatomite, sepiolite, illite and ferrous sulfate; the mass ratio of montmorillonite, diatomite, sepiolite, illite to ferrous sulfate is 2.1:2.3:1.0 : 2.0: 1.8; Passivator B includes periclase, calcite, calcium magnesium phosphate fertilizer, plant ash and calcium hydroxide; the mass ratio of the periclase, calcite, calcium magnesium phosphate fertilizer, plant ash and calcium hydroxide is 0.7:1.6 :0.9:0.6:2.4.
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