Method for increasing extraction efficiency of copper in water solution

Abstract

The invention belongs to the technical field of extraction and separation and particularly relates to a method for increasing extraction efficiency of copper in a water solution. The method particularly comprises the steps of: adding a citrate with mole number equivalent to that of copper in a copper-containing solution of a strong acid system or adding a neutralizing reagent in a copper citrate solution system, regulating pH of the solution to 1.5-5; preparing an oxime extracting agent into a required organic phase by using kerosene according to the difference of concentrations of the copper in the water solution; and mixing the organic phase with the copper-containing solution, stirring and extracting for realizing efficient extraction of the copper. According to the invention, by using the citrate as a pH buffer agent, acid generated in a water phase in an extraction process is buffered by citrate radicals, the activity of hydrogen ions in the solution is reduced, therefore, the continuous extraction of the copper is facilitated; and because the copper extraction efficiency is high and the extraction stage number is reduced, the investment, the occupation area and the operation and maintenance cost of equipment are greatly lowered in practical use,.

Description

technical field [0001] The invention belongs to the technical field of extraction and separation, and in particular relates to a method for improving copper extraction efficiency in aqueous solution. Background technique [0002] Copper is a metal with a wide range of uses, and its production process is mainly divided into two technologies: pyrometallurgy and hydrometallurgy. So far, pyrometallurgy technology accounts for about 80% of total copper production, while hydrometallurgy accounts for about 20% of copper production. Pyrochemical copper smelting is a traditional process, which requires beneficiation and enrichment of the mined copper ore, and a huge sulfuric acid production system, which is a big constraint when the sulfuric acid market shrinks. Copper hydrometallurgy is a copper smelting technology that appeared in the late 1960s. It has the advantages of low investment and short process. At present, it is mainly used for the recovery and utilization of oxidize...

AI Technical Summary

Problems solved by technology

If neutralization is used to control acidity, reagents will be consumed and impurities will be brought in, which is not conducive to the leaching of subsequent processes

There are two ways to control the concentration of copper in the raw material solution. One is to reduce the concentration of the pulp in the leaching process and directly produce a leaching solution with a lower copper content. This will make the leaching system equipment too large, and the investment and operation costs will increase significantly; Another method is to dilute the high-concentration copper-containing leaching solution with a large amount of water to reduce the copper concentration to about 5g / L. At this time, a higher copper extraction efficiency can be guaranteed. This method is used to extract the copper-containing material by stirring the leaching solution The process has been applied in industry, but its disadvantages are that the amount of liquid processed in the extraction system increases, the extraction equipment occupies a large area, the investment is high, and the amount of extraction agent and diluent is doubled.

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