Iron balancing technology in low-grade sulfide ore biological heap leaching-leachate purification-extraction and separation process

Abstract

The invention relates to an iron balancing technology in a low-grade sulfide ore biological heap leaching-leachate purification-extraction and separation process. The technology comprises the following steps: firstly dissolving alunite and other potassium-containing minerals in a mineral heap to form one part of iron vitriol type precipitate in the mineral heap; secondly adding lime into a biological leachate to regulate the pH value of the leachate, adding a mixed leaching bacterial solution of ferrous oxide and the like and an iron vitriol seed crystal, and accelerating the formation of the iron vitriol type precipitate by a biological vitriol formation method to realize fast and efficient purification and iron removal; and adding the mixed leaching bacterial solution of iron-oxidizing bacteria and the like before raffinate returns to the mineral heap, regenerating iron in the raffinate, and then returning the raffinate to the mineral heap as spraying liquid. The iron balancing technology provided by the invention is suitable for controlling impurities in the biological leaching process of low-grade sulfide ores, the problems of serious entrainment of valuable elements, high neutralization cost and the like caused by traditional iron removal by neutralizing with the lime are solved, and the leaching and extraction separation efficiency is improved at the same time.

Description

technical field [0001] The invention relates to a technology aiming at the balance of iron in the bioheap leaching process of low-grade sulfide ore through bioheap leaching-leaching liquid purification-extraction separation of sulfide ore. Background technique [0002] With the continuous development and utilization of mineral resources, rich ore and easy-to-treat ores are decreasing day by day, and low-grade and refractory ores have to be developed and utilized. At present, bioheap leaching-extraction-electrodeposition process has achieved good recovery results for low-grade copper ores. However, for the subsequent leachate separation process of bioheap leaching of complex polymetallic sulfide ores, especially for bioleach with low content of valuable metal ions and high content of impurity ions, the purification-extraction separation process has not yet matured for reference. Among them, bioleachate The purification process is particularly important. If the bioleaching sol...

AI Technical Summary

Problems solved by technology

However, for the subsequent leachate separation process of bioheap leaching of complex polymetallic sulfide ores, especially for bioleach with low content of valuable metal ions and high content of impurity ions, the purification-extraction separation process has not yet matured for reference. Among them, bioleachate The purification process is particularly important. If the bioleaching solution is not purified, it will seriously affect the subsequent extraction and separation efficiency and the recycling of the extraction agent.

[0003] During a low-grade copper-nickel-cobalt bioheap leaching process, due to a large amount of pyrite leaching, the iron concentration in the leachate is too high, the total iron concentration is greater than 20g / L, and the total iron concentration will increase after the raffinate is circulated for a long time , if not treated, the total iron concentration can reach more than 50g / L, seriously affecting the subsequent extraction and separation process

If the traditional lime neutralization and precipitation process is adopted, it will not only increase the treatment cost, but also increase the loss of valuable metals copper, nickel and cobalt

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