Method for normal temperature and pressure whole-wet leaching of toxic elements in mining and metallurgical solid waste

Abstract

The invention relates to a method for normal temperature and pressure whole-wet leaching of toxic elements in mining and metallurgical solid waste, wherein the solid waste at least contains one of toxic elements comprising Hg, Cd, Ge, Te, Cr, Ga, Li, In, Sn, Pb, Ni, Tl, As, Sb, Be, F, Co, Bi, Cu and Ag. The method comprises the steps: crushing the solid waste, then adding water, and blending into a mine slurry; adding sulfuric acid and a leaching aid polyol sulfone halogen into the mine slurry, and carrying out first-stage leaching; filtering the last-step leached liquid, carrying out itemized extraction of the toxic elements contained in the filtrate, carrying out second-stage leaching on a filter residue with sodium chloride added with the leaching aid, and carrying out hydrolysis or ion exchange of the leached liquid to obtain corresponding metal enriched products. With adopting of the novel leaching aid polyol sulfone halogen, the acid leaching process of the toxic elements in the solid waste is fundamentally changed, not only is the efficiency improved but also all the toxic elements can be leached, then itemized separation and extraction is carried out, the post liquid after the toxic elements are extracted can be purified into pure water for reuse, and elements in the leached residue have no toxicity, so that the mining and metallurgical solid waste raw material can be treated with low cost and high efficiency, the waste is turned into treasure, and solid waste resource and innocuous utilization are achieved.

Description

technical field [0001] The invention belongs to a hydrometallurgy treatment method for recycling and harmless mining and metallurgy solid waste, in particular to a method for leaching toxic elements in ore and metallurgy solid waste by normal temperature and pressure full wet method. Background technique [0002] Metallurgical solid waste refers to solid waste with complex composition of mineral elements and various toxic elements including lead, mercury, arsenic, copper and fluorine. slag, electrolytic sludge, etc. There are generally two methods for the treatment of such materials in the prior art. One is to leach part of the toxic elements with water or unit inorganic acid, separate the solid and liquid, neutralize the liquid phase with lime and precipitate it into basically stable multi-element calcium, collect and fill Buried, the solid phase is mostly multi-element slag, and one or two valuable elements in the slag are recycled. The second method is to use the charac...

AI Technical Summary

Problems solved by technology

[0003] Neither of the existing two technologies can effectively separate all the toxic elements in hazardous waste from mining and metallurgy waste, and both produce secondary pollution or long-term pollution to varying degrees

However, the degree of recovery and utilization of valuable metal elements is relatively low.

The existing wet process cannot achieve zero-pollution discharge of sewage after treating such materials, and the treatment cost is high. It is difficult for general sewage treatment enterprises to achieve market-oriented operation. processing

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