Stabilizing agent for lead, arsenic and cadmium and method for treating multi-metal calcium-based sludge by using stabilizing agent
A stabilizer and multi-metal technology, applied in the field of multi-metal calcium-based slag treatment, can solve the problems of high cost, large capacity ratio, large amount of cement, etc., and achieve simple operation, improved stabilization rate, and reduced leaching toxicity. Effect
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[0050] In an optional embodiment, the preparation method of the iron-based biological stabilizer comprises:
[0051] The raw materials including ferrous sulfate heptahydrate, ammonium sulfate, potassium hydrogen phosphate, magnesium sulfate, potassium chloride and water are mixed, and the pH value is adjusted to the first target value with sulfuric acid to obtain a liquid culture medium;
[0052] Thiobacillus ferrooxidans is inoculated in the liquid medium, and the pH is adjusted to the second target value with sulfuric acid, and then the iron-based biological stabilizer is obtained by culturing.
[0053] In an optional embodiment, in the liquid medium, the content of ferrous sulfate heptahydrate is 40~50g / L, the content of ammonium sulfate is 0.1~1g / L, and the content of potassium hydrogen phosphate is 0.1~1g / L, the content of magnesium sulfate is 0.1~1g / L, and the content of potassium chloride is 0.1~0.5g / L.
[0054] In an optional implementation manner, the first target v...
Embodiment 1
[0070] This embodiment provides a stabilizing agent for lead, arsenic, and cadmium, including: an iron-based stabilizer, a sulfur-based stabilizer, and an auxiliary stabilizer; the iron-based stabilizer is ferrous sulfate, the sulfur-based stabilizer is sodium sulfide, and the auxiliary stabilizer is The stabilizer is calcium carbide slag slurry. Carbide slag slurry is a slurry with calcium carbide slag as raw material and containing 20% calcium.
[0071] The mass ratio of iron-based stabilizer, sulfur-based stabilizer and co-stabilizer is 3:0.25:0.02.
[0072] The present embodiment also provides a method for treating polymetallic calcium-based slag sludge using the stabilized agents of lead, arsenic and cadmium, which specifically includes the following steps:
[0073] The polymetallic calcium-based slag sample (XRD pattern shown in figure 1 Add deionized water to make the moisture content 25%, then add stabilizing agent (the dosage of ferrous sulfate is 3%, the dosage o...
Embodiment 2
[0077] This embodiment provides a stabilizing agent for lead, arsenic, and cadmium, including: an iron-based stabilizer, a sulfur-based stabilizer, and an auxiliary stabilizer; the iron-based stabilizer is polymeric ferric sulfate, the sulfur-based stabilizer is potassium sulfide, and the auxiliary stabilizer is The stabilizer is a polyacrylamide solution with a mass concentration of 1‰.
[0078] The mass ratio of iron-based stabilizer, sulfur-based stabilizer and co-stabilizer is 2:0.3:0.05.
[0079] The present embodiment also provides a method for treating polymetallic calcium-based slag sludge using the stabilized agents of lead, arsenic and cadmium, which specifically includes the following steps:
[0080] Add deionized water to the polymetallic calcium-based slag sample to make the water content 25%, and then add stabilizing agents (the amount of polymerized iron sulfate is 2%, the amount of potassium sulfide is 0.3%, and the amount of polyacrylamide solution is 0.05%) t...
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