Method for improving extraction and separation efficiency of nickel and cobalt in biological leaching liquid

Abstract

The invention relates to a method for improving extraction and separation efficiency of nickel and cobalt in biological leaching liquid. The method comprises the following steps: (1) respectively carrying out homogeneous saponification on a nickel-cobalt extraction agent P507 and a synergist Cynaex272 by adopting a NaOH solution, wherein the saponification time is 30 minutes, and the saponification rate is 60%; (2) mixing the saponified extraction agent P507 with the synergist Cynaex272 according to the volume ratio of 3:2 to form a combined extraction agent, and diluting the combined extraction agent of which the final concentration is 10% by using 260# sulfonated kerosene; (3) extracting under the conditions that the temperature is 25-28 DEG C and the initial pH value is 1.5-2.0, wherein the extraction phase ratio O / A is 1:4, the oscillation strength is 180rpm, and the extraction oscillation time is 3 minutes, controlling the extraction balance pH value to 4.0-4.5; stewing and splitting for 30 minutes, and separating an organic phase from a water phase; (4) adding sulfuric acid extraction cobalt to the separated organic phase, so as to achieve nickel-cobalt separation. By adopting the method, nickel-cobalt extraction and separation can be achieved under a low pH value, the extraction cost also can be reduced, the extraction grade is reduced, and the loss caused by nickel-cobalt is reduced, so as to improve the extraction and separation efficiency of nickel and cobalt.

Description

technical field [0001] The invention relates to the technical field of extraction of non-ferrous metals, in particular to a method capable of improving the extraction and separation efficiency of nickel and cobalt in biological leaching solutions for the characteristics of low content of valuable metal ions and poor separation effect of nickel and cobalt in microbial leaching solutions. 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 treatment of low-grade ores, waste rocks, and polymetallic symbiotic ores that cannot be used by traditional metallurgical meth...

AI Technical Summary

Problems solved by technology

Before the extraction and separation of nickel and cobalt in the traditional process, lime must be used to adjust the pH value of the leachate from 2.0 to 3.5-4.0, which not only increases the cost of neutralization, but also increases the loss of valuable metal nickel and cobalt

[0004] Therefore, in view of the problems of difficult extraction and separation of nickel and cobalt in the complex bioleaching solution system of polymetallic sulfide ores, and low extraction efficiency, it is necessary to develop a method to improve the extraction and separation efficiency of nickel and cobalt in the bioleaching solution, which can be used at a relatively low initial pH value ( 1.5-2.0), by matching the extraction process parameters reasonably, the extraction and separation efficiency of nickel and cobalt can be improved, and the extraction and separation of nickel and cobalt can be realized. Therefore, this method can reduce the extraction cost, reduce the number of extraction stages and reduce the interaction The loss caused by containing, thereby improving the extraction and separation efficiency of nickel and cobalt

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