Two-stage selective heterogenite leaching method

Abstract

The invention discloses a two-stage selective heterogenite leaching method which is characterized by including the steps: (1) grinding: crushing and finely grinding heterogenite to enable 80% or more reaches the granularity of 200 meshes; (2) leaching copper at the primary stage: mixing 80% or more of the heterogenite with the granularity of 200 meshes and water to prepare 33% of ore pulp, adding sulfuric acid into the ore pulp, leaching for 0.5h-2.5h at the normal temperature, and performing solid-liquid separation after reaction is finished to obtain leaching liquid and copper leaching residues; (3) leaching cobalt at the secondary stage: mixing the copper leaching residues leached at the primary stage and sulfuric acid aqueous solution to prepare 20% of ore pulp, adding 1-2 times of iron powder into the ore pulp according to theoretical quantity, performing reaction at the temperature ranging from the normal temperature to 85 DEG C, mixing for 0.5h-3h, and performing solid-liquid separation after leaching is finished to obtain cobalt-rich leaching liquid and leaching residues. The addition of the sulfuric acid is equal to 10%-25% of the heterogenite by mass fraction, and the concentration of the sulfuric acid aqueous solution is 10g / L-30g / L.

Description

technical field [0001] The invention relates to a method for wet leaching of cobalt ore, in particular to a two-stage method for selectively leaching copper and cobalt in cobalt ore by using iron powder as a reducing agent in a sulfuric acid system, and belongs to the technical field of hydrometallurgy. Background technique [0002] Cobalt metal has the characteristics of good high temperature resistance, corrosion resistance, strong magnetism, etc., and is widely used in aerospace, machinery manufacturing, electrical and electronics, chemistry, ceramics and other industrial fields. , an important raw material for batteries, has special significance in national economic and social development, and is therefore listed as one of the important strategic metals. [0003] The world's cobalt reserves are concentrated in Congo (Kinshasa), Zambia, Cuba, Australia, New Caledonia, Canada and Russia. The cobalt reserves of Congo (Kinshasa) and Zambia are close to half of the world's c...

AI Technical Summary

Problems solved by technology

[0005] Disadvantages of using one-stage leaching method in industrial production and preliminary research: the leaching rate of copper and cobalt is low; the cobalt content in the leaching slag washing liquid and raffinate extraction liquid is low, which is unfavorable to the subsequent cobalt recovery process

Disadvantages of using reducing agent: the effect of using ferrous sulfate as reducing agent is better, but because iron ions are introduced into the leaching system, the iron content in the leaching solution will increase, resulting in difficulty in the subsequent iron removal process and excessive loss of cobalt; use Sodium metabisulfite, sodium sulfite and SO 2 The advantage of being used as a reducing agent is that it will not introduce impurity iron into the leaching system, and the leaching reaction speed is relatively fast, but it is easy to precipitate sulfur dioxide gas in the acidic leaching solution, which will deteriorate the operating environment of the leaching process and increase the consumption of reducing agent. The cost is too high; the reducing agents used in some recent studies are all in the preliminary research stage, and some issues such as biochemical leaching of pyrite, preparation of copper thiosulfate, and the utilization rate and price of hydrogen peroxide still need further investigation

Although the method is simple in equipment and low in cost, more impurities are brought in during the leaching process, which makes the subsequent treatment process complicated, and the aging process is difficult to operate, so it is not suitable for large-scale production.

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