Lead zinc ore flotation depressing agent composition and lead zinc ore flotation method

Abstract

The invention provides a lead zinc ore flotation depressing agent composition and a lead zinc ore flotation method. The problem that the grade of zinc in lead concentrate is high is solved, the zinc recovery rate is improved, meanwhile, the consumption of flotation reagents needed in the method is low, and cost is greatly saved. In addition, the depressing agent composition restraining zinc floating is good in zinc retraining effect, nontoxic, free of time limiting performance and wide in raw material source.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a lead-zinc ore flotation inhibitor composition and a lead-zinc flotation method. Background technique [0002] Lead-zinc is one of the earliest metals extracted from lead-zinc ore by humans. There are 11 kinds of lead industrial minerals in lead-zinc mines, and 6 kinds of zinc industrial minerals, of which galena and sphalerite are the most important; The chemical formula of lead ore is PbS, the crystal structure is an equiaxed crystal system, the sulfur ions are the most closely packed into cubes, and the lead ions are filled in all octahedral voids; the chemical formula of sphalerite is ZnS, and the crystal structure is an equiaxed crystal system. Zn ions are distributed in the corners of the unit cell and the center of all faces, and S is located in the center of four of the eight small cubes divided into the unit cell. [0003] In the flotation of lead-zinc ore, ...

AI Technical Summary

Problems solved by technology

At present, the commonly used inhibitors or inhibitor compositions mainly include: (1) Zinc sulfate and lime are used as the inhibitor composition. Will ionize Zn 2+ and SO 4 2- , Zn 2+ Hydrolysis produces Zn(OH) 2+ , in alkaline medium, to get HZnO - and ZnO 2 2 -, they are adsorbed on the mineral surface to enhance the hydrophilicity of the mineral surface, but the effect of the composition is not obvious, the production index cannot meet the requirements, and the consumption of related chemicals is large; (2) Zinc sulfate and cyanide are used as inhibitors Agent composition, cyanide is mainly sodium cyanide and potassium cyanide, and also calcium cyanide; the main principle is that cyanide is a salt generated by strong base and weak acid, which is hydrolyzed in the pulp to generate HCN and CN-, and zinc sulfate Combined use can generate zinc precipitates, thereby inhibiting the flotation of zinc during the flotation process in the lead area, and can strengthen the inhibitory effect on sphalerite. Specifically, when the mass ratio of cyanide:zinc sulfate is 1:2.5, CN- and Zn 2+ Formation of colloidal Zn(CN) 2 Precipitation inhibits the flotation of zinc, but cyanide is highly toxic, and the effect of the composition is not good; (3) sulfurous acid, sulfite or SO 2 Gas as inhibitor: sulfurous acid, sulfite or SO 2 As an inhibitor, the inhibitory effect is HSO 3 - , it needs to be in the weakly alkaline pulp to achieve the inhibitory effect, and the sulfite is easy to fail in the pulp, and the inhibitory effect is time-limited; Floating inhibitor or inhibitor composition, and then reduce the grade of zinc in lead concentrate in the flotation process, is an urgent need for lead-zinc ore beneficiation enterprises

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