Dilution extraction process capable of improving copper recovery rate

Abstract

The invention provides a dilution extraction process capable of improving the copper recovery rate. In a two-stage countercurrent extraction system of a copper-containing solution, raffinate after first-stage extraction is diluted according to an appropriate proportion, then second-stage extraction is performed, an organic phase in the raffinate is recovered by using an oil separation tank, then neutralization is performed by lime, and the up-to-standard emission is further realized. The process has the advantages of simple process flow, good matching property with an existing process, no increase in equipment investment, no increase in production and operation cost, no influence on technical indexes of the extraction process, capability of effectively improving the extraction recovery rate of copper and reducing loss of copper, and the like. The process can also be popularized and applied to a high-acid leaching solution containing copper materials for extracting copper, the copper-containing high-acid leaching solution is used for leaching in a circulating manner, and part of the high-copper and high-acid leaching solution is discharged by opening a path regularly, diluted appropriately and then used for extracting copper, so that the effects of improving the copper leaching rate by high-acid leaching and improving the copper extraction rate by low-acid extraction are achieved, the problems of copper loss, a large amount of gypsum slag, non-smooth copper extraction process and the like caused by a lime neutralization-extraction process of the high-acid leaching solution can be avoided, and the process has relatively good popularization and application prospects.

Description

1. Technical field [0001] The invention relates to the technical field of chemical industry and metallurgy, in particular to a dilution extraction process, in particular to a dilution extraction process for improving copper recovery. 2. Background technology [0002] Extraction is a key step in modern wet copper extraction (leaching-extraction-electrowinning process, L-SX-EW). With the development of efficient and stable copper extractant, the hydrometallurgy of copper has been greatly developed. Currently, 20% of the world's copper is produced by the extraction-electrowinning process. [0003] The principle of copper extraction can be represented by the following reaction formula: [0004] Extraction process: Cu 2+ +2R-H====R 2 Cu+2H + [0005] Stripping process: R 2 Cu+2H + ====Cu 2+ +2R-H [0006] From the reaction formula of copper extraction, it can be seen that the increase of solution acidity will cause the reaction equilibrium of copper extraction to shift ...

AI Technical Summary

Problems solved by technology

There are many deficiencies in this method, such as the generation of copper hydroxide precipitation and gypsum slag entrainment, resulting in 5% to 20% copper loss in the leaching solution in the neutralization slag; a large amount of gypsum slag will be produced after lime neutralization, and part of the gypsum slag is in the neutralization slag. The plate and frame filter press will pass through the filter, making the solid content of the extraction liquid high, which will lead to an increase in the three-phase volume of the extraction system; at the same time, a large amount of iron hydroxide colloid will be produced during the lime neutralization process, which is not conducive to the oil-water mixed phase. The phase separation process will also lead to an increase in the three-phase volume of the extraction system

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