Method for comprehensively recovering nickel and magnesium in bio-leaching process of high-magnesium low-nickel sulfide ore

A technology of bioleaching and sulfide ore, applied in the direction of improving process efficiency, can solve problems such as inability to recover economically, difficult extraction and separation, and inability to comprehensively recover, and achieve the effect of reducing costs and improving separation efficiency.

Inactive Publication Date: 2015-07-01
有研资源环境技术研究院(北京)有限公司
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the bioleaching process of high-magnesium and low-nickel sulfide ores, due to the concentration ratio of magnesium ions and nickel ions in the leaching solution under the condition of 100>Mg / Ni>5, the traditional step-by-step precipitation or direct extraction separation process cannot be effective. Separation of nickel and magnesium. At the same time, the high concentration of magnesium ions in the solution will have a strong inhibitory effect on the activity of bacteria in bioheap leaching. On the other hand, it cannot be economically recovered, resulting in waste of resources.
Therefore, for bioleach solutions with low nickel ion content and high magnesium ion content, it is necessary to solve the problem of reducing magnesium ions and enriching nickel ions before extraction. Due to the problems of difficult extraction and separation and inability to comprehensively recover, it is necessary to develop a method for comprehensively recovering nickel and magnesium in the bioleaching process of high-magnesium and low-nickel sulfide ores, so as to provide a new way for the separation, extraction and comprehensive recovery of valuable metals in the bioleaching solution

Method used

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  • Method for comprehensively recovering nickel and magnesium in bio-leaching process of high-magnesium low-nickel sulfide ore

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Effect test

Embodiment 1

[0020] A certain nickel ore belongs to high magnesium and low nickel sulfide ore (produced in Laos, with magnesium content of 23wt%, nickel content of 0.2wt%, and iron content of 4wt%). After bioheap leaching to adjust the pH to 2.0-2.5, nickel ions in the obtained bioleaching solution It is 300mg / L, while the magnesium ion reaches 15g / L, Mg / Ni=50, and the total iron ion concentration is 25mg / L. The higher magnesium-nickel concentration ratio in the leaching solution will seriously affect the extraction and separation efficiency of nickel.

[0021] Step (1), take the leachate produced by bioheap leaching of high-magnesium and low-nickel sulfide ores, Mg / Ni=50 (mass concentration ratio), pH2.5, Mg 2+ 15g / L, total iron concentration 25mg / L;

[0022] Step (2), the leaching solution passes through the ion exchange resin column CN27, the nickel ions are adsorbed, the nickel ion adsorption rate reaches more than 99%, and the magnesium-rich solution flows out, and the solution Mg 2+...

Embodiment 2

[0029] A certain nickel ore belongs to high-magnesium and low-nickel sulfide ore (produced from Jinchuan tailings, with magnesium content of 15wt%, nickel content of 0.3wt%, and iron content of 5wt%). The nickel ion is 200mg / L, while the magnesium ion reaches 15g / L, Mg / Ni=75, and the total iron ion concentration is 27mg / L. The higher magnesium-nickel concentration ratio in the leaching solution will seriously affect the extraction and separation efficiency of nickel.

[0030] Step (1), take the leachate produced by bioheap leaching of high-magnesium and low-nickel sulfide ores, Mg / Ni=75 (mass concentration ratio), pH2.5, Mg 2+ 15g / L, total iron concentration 27mg / L;

[0031] In step (2), the leaching solution passes through the ion exchange resin column WP-1, and the nickel ions are adsorbed, and the adsorption rate of the nickel ions reaches more than 98%, and the magnesium-rich solution flows out, and the solution Mg 2+ Concentration 12g / L;

[0032] Step (3), using 20g / L s...

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Abstract

The invention discloses a method for comprehensively recovering nickel and magnesium in a bio-leaching process of high-magnesium low-nickel sulfide ore. The method comprises the following steps: treating the bio-leachate of high-magnesium low-nickel sulfide ore through an ion exchange resin column to adsorb nickel ions, and enabling the magnesium-rich solution to flow out; desorbing residual magnesium ions in the ion exchange resin by use of low-acidity sulfuric acid, desorbing nickel ions in the ion exchange resin by use of high-acidity sulfuric acid, and returning the nickel ion desorption solution to the yard; and when the mass concentration of Mg and Ni in the leachate of the yard is lower than 5, extracting nickel with Versatic 10 and performing back extraction of an organic phase to obtain a nickel-rich solution. According to the method, by increasing the nickel-magnesium concentration ratio and reasonably matching the technological parameters, nickel and magnesium are effectively separated, and a recovery method of nickel and magnesium in bio-leachate is realized.

Description

technical field [0001] The invention relates to non-ferrous metal bioleaching technology, in particular to a method for comprehensively recovering nickel and magnesium in the bioleaching process of high-magnesium and low-nickel sulfide ores. Background technique [0002] Nickel 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 continues to increase, and the ore grade of nickel ore mining is also declining. For some low-grade and refractory nickel ores, the traditional dressing and smelting process cannot Dispose of recycling economically. The microbial leaching technology has unique features in the treatment of low-grade ores, waste rocks, and polymetallic symbiotic 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. Therefore, microbial lea...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B3/24C22B3/26C22B23/00C22B26/22
CPCY02P10/20
Inventor 刘学武彪谢刚温建康陈勃伟
Owner 有研资源环境技术研究院(北京)有限公司
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