Separation and extraction method for nickel and cobalt in low-grade sulfide mineral bioleaching agent through synergistic extraction

Abstract

The invention provides a separation and extraction method for nickel and cobalt in a low-grade sulfide mineral bioleaching agent through synergistic extraction. The separation and extraction method comprises the following steps: adopting a biological alum precipitation method to perform iron removing on the nickel-cobalt-containing leaching agent, adding iron-oxidizing bacteria under the condition that the pH is 1.8 to 2.0, utilizing oxidation of the bacteria to oxidize ferrous ions in the leaching agent into ferric ions, and enabling the ferric iron to form jarosite-class precipitation; adopting the extraction agent P204 to perform impurity removing on the residual impurities in the leaching agent after iron removing to remove impurities including calcium, magnesium and the like; and using the compound extraction agent containing extraction agent P507 and Cynaex 272 to perform synergistic extraction on the leaching agent after impurity removing, standing for phase splitting for 30 min after extraction, and adding sulfuric acid into the organic phase and performing reverse extraction to extract out cobalt, so as to realize separation of nickel and cobalt through synergistic extraction. The method provided by the invention can reduce neutralization cost of pH value adjustment before extraction of the leaching agent, and omits the pH adjusting procedure when subsequent extraction raffinate returns back to the mineral pile, so as to simplify the technological process, and reduce the neutralization cost and nickel and cobalt entrainment losses caused in the neutralization process.

Description

technical field [0001] The invention relates to the technical field of extraction of nonferrous metals, in particular to a nickel-cobalt co-extraction separation and extraction method for complex bioleaching liquid systems of low-grade sulfide ores. Background technique [0002] With the continuous development and utilization of mineral resources, rich ore and easy-to-handle ores are decreasing day by day, and low-grade complex and difficult-to-handle ores have to be developed and utilized. At present, the bioheap leaching-extraction-electrodeposition process has achieved good recovery results for low-grade copper ores . However, for the subsequent leachate separation process of complex polymetallic sulfide ore bioheap leaching, the traditional extraction and separation process is usually carried out at a relatively high pH value (3.5-6.0). There is no mature technology to learn from the bioleach solution with high and low pH. If the pH value is adjusted by lime neutralizat...

AI Technical Summary

Problems solved by technology

This not only increases the cost of neutralization, but also increases the loss of valuable metal nickel and cobalt

In addition, since most of the raffinate is used for the spraying operation of the mine heap, the pH value of the spray liquid is generally about 2.0, so a large amount of acid is needed to adjust the pH value of the raffinate back to about 2.0, thus greatly increasing the processing time. cost

To sum up, the traditional process not only increases the process of adjusting the pH value before and after extraction, increases the processing cost, but also causes the entrainment loss of valuable metal nickel and cobalt

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