Acid washed ore leaching process for low-grade copper oxide ores with high mud content

Abstract

The invention provides an acid washed ore leaching process for low-grade copper oxide ores with high mud content, which comprises the following steps: after the raw ores are crushed and sieved, conveying the ores of +50mm size fraction to a storage yard for stacking, and carrying out acid washed ore treatment on the ores of -50mm size fraction; by adding sulfuric acid into the washing liquid, rewashing the ores to remove partial basic gangue; after the washing liquid is separated and deposited, recycling the acid liquid; after the ores are treated by an acid washed ore system, conveying the sand ores of +0.074mm size fraction to the storage yard for stacking, and stirring and leaching the mud ores of -0.074mm size fraction; after the leaching liquid generated by stirring and the leaching liquid generated by heap leaching are mixed, carrying out extracting and electrodepositing processes; and finally, obtaining cathode copper products. The process of the invention has the advantages of short procedures, simple equipment, small investment, low cost and little pollution to the environment, further solves the problems of poor heap leaching penetrability, low copper leaching rate and the like caused by existence of mud ores and dissolution and deposition of basic gangue, improves the recovery rate of copper, and comprehensively utilizes the mineral resources of the low-grade copper oxide with high mud content.

Description

technical field [0001] The invention relates to the technical field of copper hydrometallurgy, in particular to an acidic ore washing and leaching process, which can effectively recover copper ions in low-grade high-mud copper oxide ore. Background technique [0002] There is a relatively large proportion of low-grade copper oxide ore in my country's copper ore resources. This type of mineral generally has the characteristics of high oxidation rate, fine embedded particle size, large mud content, and complex symbiosis of multiple metals. Acidic leaching-extraction- Compared with the conventional dressing and smelting technology, the electrowinning process will obtain better technical and economic indicators for this kind of ore. However, copper oxide ore is often mixed with a certain degree of mud and water. When the ore contains too much mud and water, it will have an adverse effect on the leaching process. The ore slime will block the feeding bin, funnel and crushing equipm...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a kind of acidic ore washing and leaching process for low-grade high-silt copper oxide ore. Removing part of the alkaline gangue that is easy to dissolve further solves the problems of poor heap leaching permeability and low copper leaching rate caused by the existence of mud ore and the dissolution and precipitation of alkaline gangue, and improves the recovery rate of copper. Comprehensive utilization The high-mud low-grade copper oxide mineral resources can be obtained, and greater economic benefits can be obtained

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