Iron removal process for copper cobalt ore leach liquor

Abstract

The invention relates to an iron removal process for copper cobalt ore leach liquor, belonging to the cobalt wet smelting industry. At present, the goethite method and the precipitate neutralization iron removal method are combined to remove iron, although the total quantity of iron slag can be reduced, the total quantity of the iron slag is still great because the precipitate neutralization method with high pH value is used for removing iron at a later stage. The process is characterized by comprising the following steps of: firstly, oxidizing the liquor before iron removal to oxidize ferrous iron in the liquor into ferric iron; then, removing most of iron impurities in the oxidized liquor before iron removal by using the goethite method in an iron removal tank, and removing the rest iron and other metal impurities in the liquor by the precipitate neutralization iron removal method; and filter pressing the obtained ore pulp by using a filter press to obtain filter liquor as liquor after iron removal. Under the premise of ensuring the iron removal effect, the iron content in the iron slag is increased by changing the slag form of scrap iron slag, and thus, the total quantity of the iron slag is reduced.

Description

technical field [0001] The invention relates to an iron removal process, in particular to an iron removal process for copper-cobalt ore leachate in the cobalt hydrometallurgy industry. Background technique [0002] The wet smelting of copper-cobalt concentrate is generally carried out in the sulfuric acid system to leach valuable metals such as Co and Cu in the ore into the solution, and the solution is purified to remove Fe, Mn, Mg, Al, Si, etc. Impurities are obtained to obtain a relatively pure cobalt sulfate solution; since Fe is a kind of impurity with a relatively high content in the leaching solution, it is usually processed by an independent production system during the production process. Copper-cobalt ore leaching solution contains a large amount of Fe, this part of Fe is mainly Fe 2+ The form exists in the solution, and it must be oxidized before iron removal to make it Fe 3+ , which can be easily removed from the solution. [0003] There are usually three meth...

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Problems solved by technology

[0005] In addition, in the oxidation treatment of copper-cobalt ore leachate before iron removal, Fe 2+ The oxidation of the oxidant usually uses the oxidant hydrogen peroxide to inject into the mixing tank and directly mix with the leachate to achieve the oxidation of Fe 2+ Because this method is carried out in an open container, and a large amount of heat is released during the reaction process, part of the oxygen released by the decomposition of hydrogen peroxide is easily released from the tank into the air, which does not fully oxidize Fe. 2+ effect, resulting in lower utilization of hydrogen peroxide

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