Method for comprehensively recovering valuable metals from zinc hydrometallurgy high-temperature purification slags

Abstract

The invention discloses a method for comprehensively recovering valuable metals from zinc hydrometallurgy high-temperature purification slags. The method comprises the following steps: (1) drying and firing of the high-temperature purification slags; (2) first leaching; (3) second leaching; (4) purification and deposition of copper; (5) purification and deposition of cadmium; (6) deposition of tannin germanium; (7) deposition of cobalt; and (8) deposition of nickel and recovery of zinc by returning liquid obtained by deposition of nickel to a zinc hydrometallurgy system. The invention provides a method for leaching the zinc hydrometallurgy high-temperature purification slags twice after drying and firing to obtain the produced leaching slags, namely silver lead ore concentrate for sales, and comprehensively recovering copper, cadmium, germanium, cobalt, nickel and zinc from filtering liquid subjected to first leaching; the method is easy to carry out and simple in process; the recovery rate of the valuable metals is high, as the recovery rate of lead, silver, copper, cadmium, germanium, cobalt, nickel and zinc respectively reaches 98.50-99.50 percent, 99.10-99.70 percent, 94.40-97.80 percent, 95.10-96.90 percent, 93.50-96.70 percent, 94.70-95.70 percent, 94.80-96.80 percent, and 96.00-97.00 percent; moreover, the recovery of the valuable metals is more comprehensive, scientific and reasonable; waste water, waste gas and waste slags are avoided, and the requirement on national circular economy and sustainable development is met.

Description

technical field [0001] The invention relates to a method for comprehensively recovering valuable metals from high-temperature purified slag of zinc hydrometallurgy, in particular to comprehensively recover zinc, copper, cadmium, germanium, cobalt, nickel, lead and silver from high-temperature purified slag of zinc hydrometallurgy The method belongs to the field of hydrometallurgy. Background technique [0002] The wet zinc smelting process generally uses different production processes according to the different raw materials and impurities. Although there are many technologies and methods for the purification process of the supernatant, the zinc powder replacement method has incomparable advantages for the solution itself. Advantages, which is one of the important reasons why most of the hydrometallurgical smelters in the world currently adopt it. The zinc powder used for purification is generally electric furnace zinc powder. Due to the production process characteristics o...

AI Technical Summary

Problems solved by technology

Second, the high and low temperature slags are treated separately, that is, the cadmium is recovered after conventional leaching of the low temperature slag, and the zinc and copper slag produced by the cadmium-poor liquid return system are recovered for sale; the high temperature slag is selected under certain conditions The purpose of leaching is to recover zinc. The output of selective leaching solution is returned to the zinc system to recover zinc and the output of selective leaching cobalt and nickel slag is stored or sold; Although the selective leaching solution does not need to be purified, it can be directly returned to the zinc system, but the comprehensive recycling rate of valuable metals is low, and the industrial chain is not long

However, the copper, cadmium, germanium, nickel, etc. in the high temperature slag have not been recovered

[0007] There is no report about the comprehensive recovery of zinc, copper, cadmium, cobalt, germanium, nickel, lead, and silver from high-temperature purification slag

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