Process for extracting Zn from Zn-containing sulfide ore

Abstract

A process for extracting zinc from the zinc-containing sulfide ore, mixed Pb / Zn ore, and zinc ore concentrate is characterized by that in the presence of oxygen gas and sulfuric acid, the granular ore with the granularity less than 50 microns in general (90%) is extracted in sulfuric acid at 100-130 deg.C and 200-1000 KPa. Its advantages are low extracting temp and high selectivity of zinc.

Description

(1) Technical field [0001] A method of extracting zinc from zinc-containing sulfide minerals involving extraction from zinc concentrates or refractory zinc-containing sulfide minerals such as sphalerite with high iron content, mixed lead / zinc concentrates, or arsenic-containing zinc concentrates A method for zinc, especially a method for extracting zinc from the above-mentioned zinc-containing minerals by means of pressure leaching. (2) Background technology [0002] The traditional zinc hydrometallurgy process is to use zinc concentrate roasting-sulfuric acid leaching-leaching solution purification-electrolysis to produce zinc. But it has the following disadvantages: 1) a large amount of smoke and sulfur dioxide gas are produced during the roasting of zinc concentrate, which requires a huge acid system and has environmental pollution problems; 2) the traditional zinc hydrometallurgy process is not suitable for processing Lead and high-silicon zinc concentrates affect the l...

AI Technical Summary

Problems solved by technology

But it has the following disadvantages: 1) a large amount of smoke and sulfur dioxide gas are produced during the roasting of zinc concentrate, which requires a huge acid system and has environmental pollution problems; 2) the traditional hydrometallurgy process is not suitable for processing Lead and high-silicon zinc concentrates affect the leaching rate of zinc, and liquid-solid separation is difficult; 3) The process is complicated. After the zinc concentrate is roasted into calcine, it needs to go through neutral leaching, acid leaching and complex iron removal process.

The leaching temperature of this process is low, but the technological process is complicated, and it takes two stages of pressure leaching and one stage of normal pressure leaching to obtain a zinc recovery rate of more than 90%.

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