Flocculation extraction separation method of zinc and cobalt ions

Abstract

The invention provides a flocculation extraction separation method of zinc and cobalt ions, and relates to the technical field of extraction separation. The flocculation extraction separation method of zinc and cobalt ions comprises the following steps: leaching zinc-cobalt-containing waste residue with nitric acid or sulfuric acid to obtain a leachate; adding zinc powder to the leachate, and removing impurity components to obtain a purified liquid; adjusting the pH of the purified liquid with an alkaline reagent to obtain a flocculent suspension, mixing the flocculent suspension with an extracted organic phase containing P204, obtaining a loaded organic phase and a raffinate through an extraction reaction, and using the raffinate to recover cobalt; reversely extracting the loaded organicphase to obtain a zinc ion solution, and then recovering zinc. The alkaline reagent is added to convert metal ions to a hydroxide flocculent precipitate; the hydroxide flocculent precipitate has a large specific surface area, high specific surface energy and chemical reactivity, and can rapidly undergo an extraction reaction with acidic P204, the single-stage reaction rate is high, the extractionreaction is thorough, the amount of P204 is small, the separation effect is good, and the application prospect is broad.

Description

technical field [0001] The invention relates to the technical field of extraction and separation, and in particular to a method for flocculent extraction and separation of zinc and cobalt ions. Background technique [0002] Cobalt is an important strategic element, which has the advantages of high melting point, good wear resistance, high strength, and strong magnetism. It is widely used in national defense, atomic energy, aerospace, electronics, chemical, medical and other industries. At present, cobalt ore resources in my country are scarce, and the recovery of cobalt in cobalt-containing wastes by leaching-extraction-electrowinning process is an important way to alleviate the scarcity of cobalt resources. [0003] Zinc-cobalt-containing waste slag is an important cobalt-containing waste. In the process of cobalt recovery, the separation effect of zinc and cobalt has an important impact on the recovery rate of cobalt and the quality of cobalt products. At present, the sep...

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Problems solved by technology

The inventor has found that when P507 is used as the extraction agent, the separation effect of zinc and cobalt is usually better, but P507 is expensive, resulting in excessive production costs; and when P204 is used as the extraction agent, although P204 is relatively cheap, its extraction capacity is relatively high. Poor, it needs to use a large amount of extractant and a high number of extraction stages to achieve the ideal separation effect. For example, under the condition of pH 0.5-4, the concentration of P204 is 1.0mol / L, and the number of extraction stages is 20 to achieve zinc-cobalt efficient separation of ions

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