Methyl sulfonic acid system bismuth sulfide concentrate oxygen pressure leaching method

Abstract

The invention discloses a methyl sulfonic acid system bismuth sulfide concentrate oxygen pressure leaching method. The method comprises the following steps that S1, material pretreatment is carried out, wherein bismuth sulfide concentrate is added into a vertical mill, fine grinding treatment is carried out on the bismuth sulfide concentrate by using the vertical mill, and then the screened material is dried for later use; and S2, liquid preparation is carried out, wherein iron powder is properly added into a methyl sulfonic acid solution according to iron-containing phases and the iron content in the material, and then the solution is stirred, so that the iron powder and the methyl sulfonic acid solution are fully mixed to obtain an iron-containing methyl sulfonic acid leaching agent. According to the method, an oxygen pressure leaching technology is adopted to replace a traditional redox roasting pyrogenic process, so that bismuth is efficiently extracted, and the generation of low-concentration sulfur dioxide is avoided fundamentally. According to the bismuth sulfide concentrate leaching method, the leaching rate of the bismuth is high and can reach 93% or above, the technological process is simple. The method is simple to operate, the bismuth can be efficiently dissolved out, a sulfur product can be obtained, SO2 is not generated, and the environment-friendly advantage is achieved.

Description

technical field

[0001] The invention relates to the related technical field of ferrous metal hydrometallurgy, in particular to an oxygen pressure leaching method of bismuth sulfide concentrate in a methanesulfonic acid system. Background technique

[0002] The bismuth smelting process is divided into two types: pyromethod and wet method. Bismuth pyrometallurgy is suitable for raw materials with high bismuth content. The specific processes include smelting smelting, precipitation smelting, reduction smelting, mixing smelting and low-temperature alkaline smelting. For example, Chinese patent CN103305707A discloses a method for smelting bismuth concentrate; that is, metal oxide is used as a sulfur-fixing agent, sodium carbonate is used as a reaction solvent, and carbon is used as a reducing agent to melt at 750-950° C. to obtain rough bismuth; the method can Efficiently obtain coarse bismuth, simple equipment, short production cycle, but there is also low concentration of SO ...