Method using wet method to treat high-fluorine and high-chlorine copper smelting dust containing zinc

Abstract

The invention a method using a wet method to treat high-fluorine and high-chlorine copper smelting dust containing zinc. The method includes: the copper smelting dust is subjected to alkali washing twice to remove fluorine and chlorine impurity elements in the copper smelting dust, the alkali washing residues of the copper smelting dust are subjected to neutralizing to leach valuable metal such aszinc and copper in the copper smelting dust, the solution after the neutralizing is subjected to copper precipitation and chlorine removing, the solution after the chlorine removing is subjected to goethite-method jarosite precipitation twice to remove impurity ions such as iron, arsenic, antimony, fluorine and chlorine in the solution and lower the COD of the solution, the solution after the jarosite precipitation enters a thickening tank for subsequent purification, and the purified solution finally enters a zinc electrowinning system; neutralizing residues are subjected to medium-acid leaching once and high-acid leaching once and then enter a lead pyrometallurgy system. The method has the advantages that the valuable metal such as the zinc and the copper is recycled effectively, and the fluorine and chlorine removing effects are above 90%; efficient and low-cost effective treatment of the high-fluorine and high-chlorine copper smelting dust is achieved, and the influence of high COD caused by the high-fluorine and high-chlorine copper smelting dust on zinc electrowinning is eliminated at the same time.

Description

technical field [0001] The invention relates to a method for wet treatment of high-fluorine and chlorine-containing zinc-copper soot, which is a new process for wet leaching, separation, enrichment and recovery of valuable metals such as zinc and copper, and belongs to the field of heavy metal metallurgy. Background technique [0002] In the zinc hydrometallurgy process, excessive impurity elements such as cobalt, nickel, arsenic, and antimony in the electrolyte have a relatively large impact on the zinc electrowinning system, and often cause accidents such as electrowinning plates, so the concentration of impurity elements needs to be strictly controlled. At the same time, when the concentration of fluoride and chloride ions in the electrolyte is too high, it will also increase labor costs and production costs. For example, too high fluoride ions will cause corrosion of the cathode plate, making it difficult to manually strip the plate, and will indirectly lead to increased ...

AI Technical Summary

Problems solved by technology

At the same time, when the concentration of fluoride and chloride ions in the electrolyte is too high, it will also increase labor costs and production costs. For example, too high fluoride ions will cause corrosion of the cathode plate, making it difficult to manually strip the plate, and will indirectly lead to increased loss of the cathode plate. Excessive chloride ion content will seriously corrode the anode plate, resulting in a sharp increase in production costs, so controlling the concentration of fluoride and chloride ions in the zinc electrolyte is also very important

Recently, due to the good situation of the zinc market, the supply of high-quality materials containing zinc is in short supply. Therefore, it is imminent to develop a new technology to deal with zinc materials with high impurities.

Copper soot is a good zinc secondary material, but often this soot often contains high levels of impurity metals such as fluorine and chlorine, which makes it difficult to recover valuable metals in this material

Therefore, on the basis of referring to the process of removing zinc oxide, fluorine and chlorine by wet alkali washing, the copper soot is pretreated by alkali washing process, but the effect of removing fluorine and chlorine is limited.

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