Heavy metal polluted soil solidification and repairing composite compound and solidification and repairing method
A technology for compounding chemicals and heavy metals, applied in chemical instruments and methods, restoration of polluted soil, soil conditioning materials, etc., can solve the problem that heavy metal-contaminated soil cannot be stabilized for a long time, avoid secondary dissolution, and increase long-term stability. , the effect of low cost
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Embodiment 1
[0026] Soil heavy metal pollution solidification and restoration composite agent formula:
[0027] Quicklime 20%, iron-based biochar modified superphosphate 80%.
[0028] Wherein, the preparation process of iron-based biochar modified superphosphate is as follows:
[0029] The biomass is washed, dried, ground, passed through a 2mm sieve, and placed in a beaker. The mass ratio of iron salt to biomass is 0.2:1. Add iron salt and water, stir for 2 hours, and dry for later use; The dried iron-based biomass was ground, passed through a 2 mm sieve, and then mechanically mixed with superphosphate for 2 h; the resulting mixture was placed in a tube furnace and heated under N 2 +CO 2 Under atmosphere, bake at 600°C for 60min.
[0030] The prepared iron-based biochar-modified superphosphate and quicklime are dry-mixed evenly according to the mass ratio of 4:1 to obtain the compound agent.
Embodiment 2
[0032] Soil heavy metal pollution solidification and restoration composite agent formula:
[0033] Quicklime 30%, iron-based biochar modified superphosphate 70%.
[0034] Wherein, the preparation process of iron-based biochar modified superphosphate is as follows:
[0035] The biomass is washed, dried, ground, passed through a 2mm sieve, and placed in a beaker. The mass ratio of iron salt to biomass is 0.5:1. Add iron salt and water, stir for 2 hours, and dry for later use; The dried iron-based biomass was ground, passed through a 2 mm sieve, and then mechanically mixed with superphosphate for 2 h; the resulting mixture was placed in a tube furnace and heated under N 2 +CO 2 Under atmosphere, bake at 800°C for 60min.
[0036] Dry mix the prepared iron-based biochar-modified superphosphate and quicklime according to the mass ratio of 7:3 to obtain the compound agent.
Embodiment 3
[0038] Soil heavy metal pollution solidification and restoration composite agent formula:
[0039] Quicklime 40%, iron-based biochar modified superphosphate 60%.
[0040] Wherein, the preparation process of iron-based biochar modified superphosphate is as follows:
[0041] Wash the biomass, dry it, grind it, put it in a beaker after passing through a 2mm sieve, add the iron salt and water at a mass ratio of 0.8:1 between the iron salt and the biomass, stir for 2 hours, and dry it for later use; The dried iron-based biomass was ground, passed through a 2 mm sieve, and then mechanically mixed with superphosphate for 2 h; the resulting mixture was placed in a tube furnace and heated under N 2 +CO 2Baking under atmosphere at 900°C for 120min.
[0042] Dry mix the prepared iron-based biochar-modified superphosphate and quicklime according to the mass ratio of 3:2 to obtain the compound agent.
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