Polymetallic sulphide ore flotation process capable of increasing zinc index

Abstract

The invention provides a polymetallic sulphide ore flotation process capable of increasing a zinc index, belonging to the technical field of ore dressing. Aiming at the disturbing influence of excess reagents and other minerals in a polymetallic sulphide ore flotation system on a zinc flotation index, the polymetallic sulphide ore flotation process adopts the process steps including sulphide ore mixed flotation, reagent removal and impurity removal, zinc-sulphur mixed flotation, zinc-sulphur separation and the like, other sulphide ores with good flotability relative to zinc are preferably floated, and then zinc flotation is carried out, so that the quality and recovery rate of zinc concentrate are significantly improved. Meanwhile, the comprehensive recovery of lead, antimony, sulphur, copper and other metals is realized, and the emission of heavy metals is reduced. The polymetallic sulphide ore flotation process also can be used for increasing the utilization rate of mineral resources, and has great significance for the exploitation and utilization of low-grade or secondary mineral resources.

Description

technical field [0001] The invention belongs to the technical field of mineral processing and relates to a polymetallic sulfide ore flotation process for improving the zinc index. Background technique [0002] China's zinc resource reserves account for about 20% of the world, second only to Australia, ranking second in the world. At the same time, China is also a big producer of zinc, which is mainly used in galvanizing, brass and bronze manufacturing, chemicals, batteries and other fields. With the development of the national economy, the demand for zinc metal is increasing year by year, while the easy-to-select zinc resources are decreasing year by year. Therefore, it is urgent to develop and utilize complex, difficult-to-select, and low-grade zinc resources. [0003] Zinc exists in the crust in two forms: sulfide state and oxide state, among which zinc sulfide minerals exist in three forms: sphalerite, sphalerite and wurtzite. In my country, zinc mainly exists in polyme...

AI Technical Summary

Problems solved by technology

[0015] Many experts believe that the sphalerite in polymetallic sulfide ores is that the zinc atoms on the sphalerite lattice are replaced by Fe 3+ As a result of substitution, its valence and charge state are out of balance, and the hole concentration is reduced, and the electron density is increased, making sphalerite an N-type semiconductor mineral, which affects its buoyancy, adsorption, and oxidation. Reduction state and interface electrochemical reaction; and due to the increase of electron density, sphalerite also forms a strong repulsion to reducing acid anions, which is not conducive to the adsorption of collectors

[0016] From the above documents, we can see that because the floatability of lead, antimony, copper and other metal sulfides is slightly better than that of sphalerite, people often use the flotation method of preferentially flotation lead, antimony, copper, etc. and then separate zinc. process, it is easy to cause zinc loss in the tailings or entrainment loss in the foam generated in the flotation process; and because the difference in floatability among various sulfide ores is small, in order to improve the reentry rate of sulfide ores, it has to be mixed in flotation. A large amount of chemicals are added in the process, so that a large amount of residual chemicals that are not conducive to the flotation separation of sphalerite enter the zinc flotation process, thus affecting the recovery index of zinc concentrate

Therefore, the current polymetallic sulfide ore flotation process will have the problems of large loss of zinc metal, low zinc concentrate grade and recovery rate in the actual production process

In Documents 7 to 9, although the zinc concentrate indicators obtained from the final test results are relatively ideal, the results all require a good test environment and conditions as the basis. The polymetallic sulfide ore with high zinc content was used as the sample ore

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