Cleansing and cobalt-removing method for zinc smelting leachate and scavenging agent used therein

Abstract

The invention discloses a cleansing and cobalt-removing method for zinc smelting leachate. The method comprises the following three stages of cleansing: in the first stage of cleansing, zinc dust is employed for removal of copper and cadmium, and cadmium content is less than 0.01 g / L after the first stage of cleansing; in the second stage of cleansing, zinc dust and copper sulphate are employed to remove arsenic and antimony, and the contents of arsenic and antimony after the second stage of cleansing are less than 0.00015 g / L and less than 0.00015 g / L, respectively; and in the third stage of cleansing, a scavenging agent, an activator and active carbon are utilized to further remove residual cadmium and most Co, the contents of cadmium and cobalt after the third stage of cleansing are less than 0.001 g / L and less than 0.0004 g / L, respectively, and active carbon is used to absorb removed cadmium so as to obtain cobalt slag. According to the method, through combination of the specific scavenging agent, scavenging temperature, scavenging time and the like, consumption of zinc dust is substantially reduced by more than 55%, removed Co is hard to redissolve, a high Co removal rate is obtained, and low cost is realized. Furthermore, the invention discloses the scavenging agent used in the method.

Description

technical field [0001] The invention relates to a method for purifying leachate from non-ferrous metal zinc smelting and a purifying agent used, in particular to a method for purifying and removing cobalt from leachate from zinc smelting and the purifying agent used in the method. Background technique [0002] At present, a lot of research has been done on the purification and removal technology of zinc smelting leachate at home and abroad. The technologies widely used by domestic and foreign zinc smelting enterprises include zinc powder replacement method and chemical precipitation method. Zinc powder replacement method is subdivided into arsenic salt purification method. , antimony salt purification method and alloy zinc powder purification method, chemical precipitation method also has two branches: xanthate cobalt removal method and β-naphthol cobalt removal method. [0003] Arsenic salt purification method. Arsenic salt purification method is based on Cu 2+ In the pre...

AI Technical Summary

Problems solved by technology

However, in the disclosed method of CN101988155A, because the effect of removing Co is closely related to the content of each component of the composite additive, the effect of removing impurities is difficult to guarantee, and the removal efficiency of cobalt is still low in this method (the liquid cobalt content after purification can only guarantee ≤ 1.0mg / L )

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