Method for separating and recovering copper and arsenic from zinc hydrometallurgy copper and arsenic slag

Abstract

The invention relates to a method for separating and recovering copper and arsenic from zinc hydrometallurgy copper and arsenic slag, and belongs to the technical field of metallurgical engineering. A method for separating the copper and arsenic through high-temperature volatilization is adopted for the zinc hydrometallurgy copper and arsenic slag containing 40-60 wt% of copper and 10-20 wt% of arsenic, and specifically comprises the steps that the zinc hydrometallurgy copper and arsenic slag is put into an intermediate frequency furnace lined with a graphite device, heated to the temperature of 1100-1300 DEG C in the intermediate frequency furnace and subjected to heat preservation for 30-60 min, so that the zinc hydrometallurgy copper and arsenic slag is molten; and in the electromagnetic disturbance of an electromagnetic field and a reducing atmosphere formed by a graphite device in the furnace, arsenic in the zinc hydrometallurgy copper and arsenic slag forms elemental arsenic, and the elemental arsenic is volatilized and separated to obtain a crude copper product containing more than 95 wt% of copper and a metal arsenic product containing more than 90 wt% of arsenic. The method can directly realize high-efficiency separation of copper and arsenic from the zinc hydrometallurgy copper and arsenic slag, can obtain high-quality copper and arsenic products, and has the characteristics of simple operation, short process flow, high valuable metal recovery rate, clean and efficient treatment process and the like.

Description

technical field [0001] The invention relates to a method for separating and recovering copper and arsenic from zinc, copper and arsenic slag in hydrometallurgy, belonging to the technical field of metallurgical engineering. Background technique [0002] Zinc concentrates are usually associated with a considerable amount of copper, especially in complex sphalerites where the copper content can reach more than 1%, which has high economic value. In the process of zinc hydrometallurgy, only 40-50% of the metal copper can be recovered by using the medium leaching or medium leaching-weak acid leaching process, and the rest is left in the leaching slag. When the rotary kiln volatilization method is used to treat the leaching slag, almost all copper enters Kiln slag is difficult to recycle; when hot acid leaching technology is used to process leached slag, copper enters hot acid leaching solution along with zinc, iron and indium; when zinc concentrate is treated by pressure leaching...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem in the prior art that it is difficult to directly separate and recover copper and arsenic products from the zinc-copper-arsenic slag in the wet-method smelting, the present invention provides a method for separating and recovering copper-arsenic from the zinc-copper-arsenic slag in the wet-method smelting. In the reducing atmosphere formed by the graphite device in the furnace, pyrolysis is used to decompose the zinc-copper-arsenic slag from the wet method, and the arsenic forms elemental arsenic to volatilize, so as to directly realize the efficient separation of copper and arsenic from the zinc-copper-arsenic slag and obtain high-quality blister copper Products and metal arsenic products