Zinc hydrometallurgy production process

Abstract

The invention relates to a zinc hydrometallurgy production process. According to the zinc hydrometallurgy production process provided by the invention, reduction leached supernate is subjected to preneutralization, then zinc dust is added for replacing indium, after the indium is separately removed, oxygen with the concentration being not lower than 98 percent is filled into liquid obtained after the indium is deposited, controlling the temperature in the range of 160 to 200 DEG C and controlling the pressure in the range of 1,000 to 2,000kPa, so that iron precipitates in the liquid obtained after the indium is deposited enter slags. The iron removed liquid obtained by the zinc hydrometallurgy production process has the iron content being lower than 1.2g / l, the iron removed liquid can be directly returned to be subjected to neutral leaching, and the system has stable production working conditions and is beneficial to stable production; in the iron slags obtained by the zinc hydrometallurgy production process, the zinc content is lower than 1 percent, the zinc loss is low and the zinc recovery rate is high; the iron slags can be directly sold to a cement plant and an iron and steel plant to be used as the raw materials without being stacked in a slag field, so that the zinc hydrometallurgy production process is beneficial to environmental-protection and the comprehensive utilization of resources and mineral resources are saved.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a zinc hydrometallurgy production process. Background technique [0002] Iron removal is an important subject of wet zinc smelting. The processes of roasting, leaching, purification, electrowinning and melting and casting in wet zinc smelting are basically the same. The main difference is that different methods of iron removal are used, resulting in different wet zinc. Smelting process: 1. Conventional method. After the zinc concentrate is roasted, neutral leaching and low acid leaching are used. The zinc leaching rate is about 70%, the slag rate is about 60%, and the iron remains in the leaching slag. This method is due to the leaching slag containing Zinc is high. Generally, rotary kiln is used to volatilize and recover zinc oxide, and iron is removed by kiln slag. The kiln slag contains about 1-2% zinc and 25-30% iron. The iron slag produced by this method ...

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Problems solved by technology

[0004] The above-mentioned various wet zinc smelting iron removal processes can be classified into two categories: one is the pyrolysis leaching slag process represented by the conventional method, which is characterized by a waste slag (containing iron) The solidified slag is discharged, and the waste slag is convenient for storage and sales, which is beneficial to environmental protection, but the zinc leaching rate is low, and a rotary kiln is required to process the leaching slag to recover zinc oxide, which consumes a lot of energy and low concentration of SO 2 Flue gas needs to be treated and other problems, resulting in waste of resources and high production costs; another type of wet treatment leaching slag process represented by high temperature and high acid method, this method is characterized by the production of two kinds of waste slag, one is leaching underflow The other is to remove iron from the supernatant to produce iron slag. This method adopts high temperature and high acid leaching, with high zinc leaching rate and simple process, but because it is a wet slag, a special slag field is required. Stockpiling is not conducive to environmental protection

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