Leaching residue grading and series flotation method for complex copper mine

Abstract

The invention discloses a leaching residue grading and series flotation method for complex copper mine. The method comprises the working procedures of leaching residue grading, fine flotation and coarse flotation. Particularly, the leaching residue grading comprises the step of dividing leaching residues for hydrometallurgy of copper into fine-grained mine and coarse-grained mine according to a sieve of 60-100 meshes. The fine flotation comprises the step of carrying out series roughing selection, scavenging and fine selection for two to three times on the fine-grained mine to obtain concentrate 1, wherein the fine-grained mine is obtained through grading. The coarse flotation comprises the steps of grinding the coarse-grained mine obtained through grading until the fineness reaches 80% of less than 200 meshes, arranging and connecting the coarse-grained mine in series, carrying out roughing selection for one to two times, scavenging and fine selection for two to three times on mine discharge series to obtain concentrate 2. According to the method, the leaching residues for hydrometallurgy of the low-grade and complex mine with oxygen and sulfur mixed are graded firstly, then the different series flotation and tailing reusing processes are adopted respectively, the mineral recovery rate can be improved to 75-85% of comprehensive recovery from 30-50% of single wet dump leaching, the grade of the leaching residues is reduced to 0.2% or even lower from 0.5% of pre-flotation, the effect of comprehensive recovery is obvious, and meanwhile the pollution to environment by the leaching residues is reduced.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal beneficiation, and in particular relates to a classification and series flotation method for heap leaching leaching slag of complex copper ore wet-process copper smelting slag, especially heap leaching leaching slag of complex and low-grade copper ore such as oxygen-sulfur mixture. Background technique [0002] Copper slag is the waste slag produced during the copper ore smelting process. Its typical composition: Fe is 30-40%, SiO 2 35-40%, Al 2 o 3 ≤10%, CaO≤10%, Cu 0.5-2.1%, different smelting methods have different compositions, among which copper exists in the form of chalcocite (CuS), metallic copper and copper oxide. [0003] With the rapid development of my country's copper smelting industry and the continuous deepening of the mining industry, the naturally occurring copper resources are increasingly depleted, and copper resources are seriously insufficient. Among the proven cop...

AI Technical Summary

Problems solved by technology

In contrast, the leaching slag produced by the existing hydrometallurgy process with a copper content of more than 0.5%, although some laboratories have tried to further use bacterial leaching or oxidative leaching-extraction-electrode technology to recover the leaching slag, but due to leaching The process is complicated and the cycle is long, and it has not been verified by large-scale industrial applications; at present, most of the wet leaching residues have not been effectively utilized, especially for some oxygen-sulfur mixed ores, which can only reach 30-50% by a single wet leaching method. The leaching rate of copper is about 50% to 70%, that is to say, the remaining copper metal in the leaching slag is about 50-70%, most of which occupy a large amount of land in the form of slag, and a small part is used as building materials, resulting in a waste of copper resources and a large amount of idle land resources

Since the wet leaching of copper ore generally adopts the chloride leaching method and the sulfate leaching method, the accumulation of untreated leaching slag will cause acid pollution and heavy metal pollution to the environment, which seriously threatens the safety of the surrounding environment.

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