Purification and arsenic removal method for zinc hydrometallurgy system

Abstract

The invention discloses a purification and arsenic removal method for a zinc hydrometallurgy system. The purification and arsenic removal method for the zinc hydrometallurgy system sequentially comprises an arsenic pre-removal process, a first-stage purification process, a first-stage filter pressing process, a second-stage purification process, a second-stage filter pressing process, a third-stage purification process, a third-stage filter pressing process, a third-stage slag recycling process and the like. According to the method, the purification process is improved, so that arsenic ions which are difficult to remove in the purification process are removed, and the purposes of deeply purifying an electrolyte and improving the precipitation state of zinc sheets are achieved. On the basis of the existing process, the purposes of arsenic pre-removal and deep arsenic removal are achieved by adding an arsenic removal procedure and adding types of auxiliary materials, so that the electrolyte is deeply purified, and normal production is met. According to the method, under the condition that new impurities are not introduced, the arsenic ions in the solution can be well removed, the technical defect of plate burning caused by electrolysis of arsenic in the prior art is overcome, the stability of zinc electrodeposition precipitation is guaranteed, and the adaptability of a system to current high-arsenic ore is enhanced.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal smelting, and in particular relates to a method for purifying and removing arsenic in a zinc hydrometallurgy system. Background technique [0002] In the zinc hydrometallurgy solution, if the arsenic ion is high, it will have a great impact on electrolysis. If the arsenic ion concentration is too high, there will be particles on the front of the zinc sheet, irregular through holes on the back, lower current efficiency and lower yield of zinc sheet In severe cases, when the cathode zinc is stripped, the zinc sheet will break, resulting in difficulties in stripping zinc. In the neutral leaching process of zinc hydrometallurgy, most arsenic will enter the slag phase with the precipitation of iron. Under normal circumstances, the total arsenic concentration in the intermediate leaching overflow is ≤1.2mg / L, but When the proportion of arsenic content increases, the original balance will be br...

AI Technical Summary

Problems solved by technology

As far as the hydrometallurgy process in the current prior art is concerned, a small amount of arsenic ions in the leaching overflow will enter the slag phase with a stage of purification, but the arsenic ions in the solution cannot be removed deeply and cannot meet the requirements of electrolysis , cannot better deal with high arsenic calcine

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