Cobalt-doped high-pressure cobalt-iron separation method for high-concentration cobalt-iron leaching solution

Abstract

The invention discloses a cobalt-doped high-pressure cobalt-iron separation method for high-concentration cobalt-iron leaching solution. The technical scheme adopted in the present invention is as follows: the cobalt-containing copper-iron raw material is leached with sulfuric acid to obtain a high-concentration cobalt-iron leaching solution; after the high-concentration cobalt-iron leaching solution is diluted to a set concentration, a cobalt-containing compound is added, and the cobalt-iron separation is obtained by fully stirring. Pre-liquid; cobalt-iron pre-separation liquid is pumped into closed high-pressure equipment to create a high oxygen partial pressure environment with pure oxygen, and fully reacted under the comprehensive action of stirring, gas disturbance and liquid flow; the liquid after cobalt-iron separation adopts thickening + pressure filtration + centrifugation Liquid-solid separation is carried out, the obtained solid is iron oxide powder, and the obtained liquid is processed by SO 2 After reduction, it is returned to the front end as a diluent of high-concentration cobalt-iron leaching solution, or enters the extraction system as a cobalt-extracting stock solution. The method can realize the rapid separation of elements in the cobalt-iron leaching solution, the obtained iron oxide powder has low impurity content, can be sold as iron concentrate powder, and can realize the full and comprehensive utilization of resources while reducing the pressure of environmental protection.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and relates to a cobalt-doped high-pressure cobalt-iron separation method for a high-concentration cobalt-iron leaching solution. Background technique [0002] Copper-cobalt-iron oxide mixture, hydroxide mixture or crude copper-cobalt-iron alloy are common leaching raw materials in cobalt hydrometallurgy industry. These raw materials have the advantages of high content of valuable elements and low content of impurities such as manganese and magnesium. However, some of these raw materials also have the problem of too high iron content. Due to the close properties of cobalt and iron, the two elements will enter the solution at the same time during leaching, thus producing a large amount of mixed leaching solution containing cobalt and iron. How to efficiently separate cobalt and iron It is one of the limiting factors restricting the increase of cobalt production capacity. [0003] Chinese...

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Problems solved by technology

The method is divided into two stages, and the iron removal process is relatively cumbersome. In addition, the iron removal agent introduces impurity elements such as ammonia nitrogen and calcium, which reduces the iron grade (Fe content 25%) in the iron removal slag, and increases the subsequent wastewater treatment pressure.

[0005] In the field of cobalt hydrometallurgy, the separation of cobalt and iron in acid leaching solution itself is a relatively difficult task. Conventional and mature iron removal methods have certain problems when dealing with leaching solutions with high iron concentration.

The neutralization hydrolysis method will produce a large amount of ferric hydroxide colloid, which is not only difficult to achieve liquid-solid separation, but also easily causes the adsorption loss of cobalt ions

The treatment capacity of the goethite method is limited, and it is generally suitable for treating leachate with an iron ion concentration of about 5g / L. When the iron ion concentration is high, this process is difficult to implement

The jarosite method is suitable for treating leachate with high concentration of iron ions, but because the amount of slag produced by the jarosite method is large, and the sulfur content is high and the iron content is low, it is difficult to recycle, resulting in waste of resources and accumulation of waste slag

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