Deironing method for reducing accumulated iron ions in electrodeposition solution

Abstract

The invention discloses a deironing method for reducing accumulated iron ions in an electrodeposition solution. The method comprises the steps of adding the electrodeposition solution obtained by an electrodeposition process into a first deironing reaction tank, oxidizing divalent iron ions in the electrodeposition solution into trivalent iron ions by using a sodium chlorate solution to obtain a first mixed feed liquid, then continuously performing a low-temperature deironing reaction on the first mixed feed liquid, controlling the pH value of the low-temperature deironing reaction to enable the trivalent iron ions in the first mixed feed liquid to generate goethite, obtaining a second mixed feed liquid, and carrying out filter pressing treatment to obtain an electrodeposition solution after deironing. Therefore, the method has the advantages that the temperature requirement is low, the iron content of iron slag is high, the method is suitable for continuous production, the entrainmenteffect on valuable metal cobalt in the deironing process is weak, the removal efficiency of the divalent iron is improved by the deironing process, the energy consumption in the deironing process isreduced, the slag yield is less, and the operation stability is further enhanced by the continuous process.

Description

technical field [0001] The invention belongs to the technical field of iron removal by electrowinning solution, and in particular relates to an iron removal method for reducing the accumulation of iron ions in electrowinning solution. Background technique [0002] In the electrowinning process, it is usually necessary to remove iron from the solution after the electrowinning process. The iron removal process is not only a key process of cobalt smelting, but also a process with high energy consumption and solid waste of iron slag. [0003] The existing technology usually adopts the jarosite iron removal process. The existing technology makes the iron ions in the pre-liquid exist in the form of jarosite at high temperature. The jarosite iron removal process requires high temperature and iron slag Low iron content, intermittent production, high steam consumption, high energy consumption, large slag production, and low equipment capacity. Contents of the invention [0004] In...

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Problems solved by technology

[0003] The existing technology usually adopts the jarosite iron removal process. The existing technology makes the iron ions in the pre-liquid exist in the form of jarosite at high temperature. The jarosite iron removal process requires high temperature and iron slag Low iron content, intermittent production, high steam consumption, high energy consumption, large slag production, low equipment capacity