Method for producing electrolytic zinc from zinc oxide-containing materials

Abstract

The invention provides a method for producing electrolytic zinc from zinc oxide-containing materials. The method adopts the steps of powder crushing, ammonia leaching, hydrolysis, first stage recovery of leaching agent, liquid preparation, second stage recovery of the leaching agent, impurity removal as well as electrolysis to produce the electrolytic zinc. The method is particularly suitable for processing low-grade zinc oxide ores; firstly, the ores are prepared into mineral powder; by taking mixed solution of caustic soda and carbon-ammonia or mixed solution of ammonia water and carbon-ammonia as a leaching agent, the leaching agent and the mineral powder are subjected to two-stage or three-stage reaction in a sealed stir bucket to obtain a leach solution of zinc; the leach solution is vacuum-heated to distill ammonia components and hydrolyze the ammonia components to basic zinc carbonate; the ammonia components are absorbed by an absorber for standby; the basic zinc carbonate is dissolved by sulfuric acid or waste solution of electrolytic zinc to prepare a solution and remove impurities so as to prepare a zinc electrolyte, and CO2 generated during the reaction is absorbed by the absorption liquid for cyclic ore soaking; finally, the zinc electrolyte is mixed with the electrolytic waste solution, the mixture is sent to an electrolytic plant to produce the metal zinc by electrolysis, and the electrolytic waste solution is sent to the liquid preparation procedure for reutilization. The method has the advantages of low energy consumption, low cost and reutilization of waster used in production, and can fully utilize developing zinc resources.

Description

technical field [0001] The invention relates to a method for producing electrolytic zinc by using a material containing zinc oxide, which is especially suitable for processing low-grade zinc oxide ore. The electrolytic zinc is produced by adopting the method of powder material-ammonia leaching-hydrolysis-one-step recovery of leaching agent-liquid preparation-second-stage recovery of leaching agent-removal of impurities-electrolysis, and the method belongs to the field of zinc smelting in hydrometallurgy. [0002] Metal zinc is a basic non-ferrous metal, which is widely used in electronics, light industry, metallurgy, machinery manufacturing and other industries. At present, the main process of producing zinc in my country is to use zinc sulfide ore to produce zinc fine powder through flotation process, and then to produce electrolytic zinc by oxidizing and roasting with sulfuric acid to dissolve and remove impurities. However, with the massive development of primary ore, mine...

AI Technical Summary

Problems solved by technology

Production practice proves that direct heap leaching or tank leaching after crushing and fine grinding is to be used in this process. This process has long leaching cycle, large loss of leaching agent, low solubility of material liquid, and conventional heating and decomposition of metal solution, which consumes a lot of energy. Drying again, the carbon dioxide component in the leaching agent cannot be effectively recovered in the electrolysis process, so the effective components of the leaching agent cannot be fully recovered, which increases the production cost, thus limiting the application of this method

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