Treatment method of wet method zinc smelting by-products

Abstract

The invention discloses a treatment method of wet method zinc smelting by-products, which comprises the following steps: firstly, using a sulfuric acid solution for leaching heat treated copper-cadmium slag or copper-rich slag; then, using an organic solvent extraction method for extracting copper and cadmium at the same time from leach liquor to obtain copper-cadmium-rich organic phase zinc-sulfate-containing faffinate; using sulphuric acid for carrying out back extraction on the copper-cadmium-rich organic phase to obtain a mixed solution of copper sulfate and cadmium sulfate; then, adding a proper amount of organic precipitant into the mixed solution to obtain a mixture of organic precipitates of the copper and the cadmium; separating and washing the copper and cadmium precipitates; and adding a reducing agent solution for carrying out reduction reaction to respectively obtain sheet type copper powder and organic cadmium products. The invention realizes the value adding utilizationof wet method zinc smelting by-products, reduces the treatment cost of the zinc smelting by-products, and reaches the goals of discharge reduction and yield improvement.

Description

technical field [0001] The invention relates to a treatment method for by-products of zinc hydrometallurgy, and belongs to the technical fields of comprehensive utilization of nonferrous metal resources and environmental protection. In particular, it relates to a method for value-added utilization of copper cadmium slag or copper slag produced in a zinc hydrometallurgy process. technical background [0002] In recent years, my country's zinc smelting industry has developed rapidly, and its output has ranked first in the world for many years. Among them, the output of hydro-smelting zinc accounts for more than 70% of the total zinc output. In the zinc hydrometallurgy process, in order to obtain high-quality metal zinc, and in order to improve current efficiency and reduce power consumption, it is necessary to purify and remove impurity ions Cu, Cd, Ni, Co, etc. in the electrolyte before electrolysis. In industrial production, the two-stage replacement method of zinc powder i...

AI Technical Summary

Problems solved by technology

When the zinc oxide dust is leached, the cadmium is re-dissolved, and the cadmium is not recovered in the process, but only circulates in the system, repeatedly consuming acid and zinc powder, which increases the cost of producing zinc per ton

Generally speaking, the existing treatment process of zinc-copper-cadmium slag or copper slag is complicated, the treatment period is long, the types of chemical raw materials and equipment required are many, the intermediate by-products are many secondary materials, the consumption of zinc powder is large, and the production process There is a lot of metal zinc accumulated in the medium, and only coarse-grade products such as copper, zinc, and cadmium can be produced

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