New stage dissociation-fractional selection flotation process

Abstract

The invention relates to a selective grinding-floatation process for copper sulphide ores, particularly relates to a grinding-floatation process for complex copper sulphide ores in which the primary copper content is low, the secondary copper content is high and the secondary copper is accreted with copper oxides and the like, or the sulfide content is high. The process provided by the invention comprises the steps of first-stage ore grinding for dissociation, second-stage ore grinding for dissociation, first-step selection and second-step selection, wherein in the step of first-stage ore grinding for dissociation, ores with grinding fineness of minus 0.074mm are between 50% and 62%; in the step of second-stage ore grinding for dissociation, ores with the grinding fineness of minus 0.074mm are above 90%; in the step of first-step selection, preferential flotation on ores with a low basicity is achieved through taking an chemical agent ester-105 with a high selectivity as a collector; and in the step of second-step selection, the powerful collection of difficult floated copper can be realized by using a chemical agent such as xanthate. By using the process disclosed by the invention, the ore dressing recovery percentage of copper ores is increased, and the ore grinding cost is low, the chemical agent consumption is less, the degree of environmental pollution is low, and the ore dressing efficiency is high.

Description

technical field [0001] The invention relates to a grinding-flotation process for copper sulfide ore, especially a complex grinding-flotation process for copper sulfide ore with low primary copper content, high secondary copper content and symbiosis with copper oxide or high sulfur content. Background technique [0002] With the gradual depletion of copper resources in the world, the grade of selected ore has declined. At present, my country's economy is in a period of rapid development, and the consumption growth rate of copper resources is faster than that of western industrialized countries. There are 910 copper mine resources in my country, with a total reserve of 62.43 million tons, ranking seventh in the world, but the per capita possession is lower than the world average. Under the condition of limited mineral resources, improving the recovery rate of copper selection is the key to improving the comprehensive mineral resources. Utilization is one of the more effective ...

AI Technical Summary

Problems solved by technology

The existing process adopts one-stage grinding, and the fineness of the ore discharge is not enough to fully dissociate the minerals, or the fineness is too fine, and a large part of the useful minerals are over-ground, both of which result in a low copper recovery rate

[0004] Existing methods for improving the recovery rate of copper selection include: (1) increasing the fineness of one-stage grinding to increase the degree of dissociation of useful minerals, thereby increasing the recovery rate. Minerals with coarse cloth particle size are over-ground, and the over-ground particles are difficult to float, so that part of the easy-to-float copper minerals are over-grinded and lost in the tailings; High, the common practice is to increase the amount of collectors and inhibitors, and adopt the method of "heavy pull and heavy pressure". This method not only increases the consumption of chemicals, but also causes more serious environmental pollution to the agents; stage grinding (including coarse concentrate regrinding or medium ore regrinding) process, this method ignores the fineness of the primary grinding, although the intergrowth particles are effectively dissociated after the secondary grinding, but the useful mineral particles are too The grinding phenomenon is serious, which leads to muddying of useful minerals, and this process has a single agent system, which makes it difficult to effectively recover useful minerals; (4) Mixing and using drugs at the same time

In the roughing of the flotation system, esters and xanthates are added at the same time. Although the recovery rate of flotation is improved, because of the poor solubility of esters, xanthate is first adsorbed on the mineral surface, and the effect of esters is not fully exerted. Recovery The efficiency is still not high, and the effect of fineness on the beneficiation index is not paid enough attention when mixing drugs

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