Fluorine and chlorine removal process for zinc metallurgy industrialization ion exchange process with wet-process

Abstract

Fluorine-chlorine removing technique by ion exchange technique in zinc metallurgy industrialization by the wet method belongs to a method for removing fluorine-chlorine in zinc sulphate solution in zinc metallurgy by the wet method. Under acidic condition that pH value is 2.5-5.5, the zinc sulfate flows through ion exchange resin which absorbs fluorine and chlorine ions to remove the fluorine and chlorine from the solution. The invention has short technological flow, and is easy to operate with high chlorine removing ratio, low zinc loss ratio and low operation cost.

Description

technical field [0001] The invention relates to a purification technology of zinc sulfate solution in zinc hydrometallurgy, in particular to a technology for removing fluorine and chlorine by an industrialized ion exchange method in zinc hydrometallurgy. Background technique [0002] Recently, more than 75% of zinc in my country is produced by hydrometallurgy. In the process of hydrometallurgy, the purification of zinc sulfate leaching solution is very important. Copper, cadmium, cobalt, nickel, Harmful impurities such as fluorine and chlorine must be purified to below the allowable content, so that the electrolytic zinc process can proceed smoothly, and the electrolytic zinc sheet can be qualified. [0003] If the chlorine content in the zinc sulfate leaching solution exceeds 250 mg / L and the fluorine content exceeds 150 mg / L, it will cause the "burning plate" phenomenon of anode plate dissolution during the electrolysis process, the current efficiency will decrease, and the...

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Problems solved by technology

[0009] 2. Copper slag removal of fluorine and chlorine: Its principle is based on the interaction between copper and copper ions and chloride ions in the electrolyte to form insoluble cuprous chloride precipitation, but the efficiency of this method is not high. The process conditions are difficult to master, the production cost is high, and it is rarely used in actual production

[0010] 3. Silver slag removal of fluorine and chlorine: Its principle is based on the interaction between silver ions and chloride ions in the electrolyte to form insoluble silver chloride precipitation, but the efficiency of this method is not high, and the process conditions are difficult to master , the production cost is high, the production is not easy to manage, and less used in actual production

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