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Efficient separation and purification process for bioleaching solution with low-content nickel and cobalt

A bioleaching, purification and separation technology, applied in the direction of improving process efficiency, can solve the problems of many extraction stages, low separation efficiency, poor selectivity, etc., and achieve good mass transfer effect, large separation coefficient, and large cobalt loading. Effect

Inactive Publication Date: 2017-06-09
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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Problems solved by technology

However, methods such as single extraction technology and single ion exchange technology have their own shortcomings in the purification of cobalt salt solution. Traditional extraction and separation processes have disadvantages such as low separation efficiency, many extraction stages, poor selectivity or low loading capacity.

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  • Efficient separation and purification process for bioleaching solution with low-content nickel and cobalt

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Embodiment 1

[0024] Since a nickel-cobalt ore is a low-grade complex and refractory sulfide ore, the content of valuable metal nickel-cobalt in the bioleach solution obtained by bioheap leaching is low, which makes purification and separation difficult. The traditional extraction and separation efficiency is low and the process is complicated, which seriously affects Comprehensive recovery of nickel and cobalt.

[0025] As shown in Table 1, it is the composition analysis of the nickel-cobalt bioleach solution after the nickel-cobalt ore is bioheap leached to remove iron.

[0026] Table 1

[0027] element co Ni Cu Fe Ca Mg Contentmg / L 198 1840 3.22 0.39 390 14760

[0028] Adopting the process of the present invention to separate and purify the biological leachate, the specific steps are:

[0029] (1) Preparation of double extractant extraction resin: select the macroporous adsorption resin of HZ818 (grain grade 20-60 mesh) as the support, and use the P...

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Abstract

The invention discloses an efficient separation and purification process for a bioleaching solution with low-content nickel and cobalt. The efficient separation and purification process comprises the following steps: (1) taking a macroporous adsorption resin as a supporter, taking the saponified P507-Cyanex272 double-extraction agent as an active component of an extraction-elution resin, taking ethyl alcohol or petroleum ether as a diluent, and preparing an extraction-elution resin with the double-extraction agent; (2) filling an extraction-elution resin column with the prepared extraction-elution resin, adjusting the pH value of the bioleaching solution with nickel and cobalt to be in a range from 3.5 to 5.0, and eluting the extraction-elution resin column to carry out charging; (3) carrying out gradient elution on the extraction-elution resin column, and carrying out two-section gradient elution by virtue of an HAc-NaAc buffer solution with a pH value of 3.0-5.5 and sulphuric acid with a pH value of 1.0-3.5 separately; and (4) concentrating the eluted cobalt back-extraction solution, and then carrying out electrolytic deposition to obtain a cathode cobalt product. Compared with a conventional extraction separation method or ion exchange method, the efficient separation and purification process disclosed by the invention is multistage and efficient, and further has the advantages of being high in selectivity, good in mass transfer effect and the like, increases the separation and purification efficiency of the cobalt solution, and is simple in flow, easy to operate and low in environmental pollution.

Description

technical field [0001] The invention relates to a high-efficiency purification, separation and purification process for low-content nickel-cobalt bioleaching liquid, and belongs to the technical field of non-ferrous metal extraction. Background technique [0002] Nickel-cobalt is one of the important raw materials for the construction of the national economy. With the development of the national economy, the demand for nickel-cobalt continues to increase, and the ore grade of nickel-cobalt mines is also declining. For some low-grade and refractory nickel-cobalt mines, traditional Smelting processes cannot economically process recycling. The microbial leaching technology has unique features in the utilization of low-grade ores that cannot be used by traditional metallurgical methods, and has the advantages of low process investment, low cost, high yield, less environmental pollution, and simple operation. The treatment of nickel-cobalt ore has a wide range of application val...

Claims

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Application Information

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IPC IPC(8): C22B3/40C22B3/24C22B23/00C22B3/18
CPCC22B3/18C22B3/24C22B23/04C22B3/26Y02P10/20
Inventor 周桂英汪菊香温建康周成英
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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