Deironing method for reducing accumulated iron ions in electrodeposition solution

An iron ion and solution technology is applied in the field of iron removal to reduce the accumulation of iron ions in an electrowinning solution, which can solve the problems of low equipment productivity, low iron content in iron slag, and high temperature requirements, and achieves less slag production and iron slag. The effect of high iron content and low temperature requirements

Inactive Publication Date: 2020-06-19
GEM JIANGSU COBALT IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 of the present invention provides a method for removing iron by reducing the accumulation of iron ions in the electrowinning solution, the method is implemented through the following steps:

[0029] Step 1, add the electrowinning solution obtained by the electrowinning process into the first iron removal reaction tank, and then add sodium chlorate solution to the first iron removal reaction tank at a flow rate of 85-170 L / h, and control the The amount of sodium solution added controls the potential of the feed liquid in the first iron removal reaction tank at 550-580mv, reacts at 55°C, oxidizes the ferrous ions in the electrowinning solution to ferric ions, and takes samples to detect the ferrous ions Specifically, take 1mL of the filtrate of the first iron removal reaction tank, add the indicator, the indicator is potassium dichromate standard solution, drop a drop of potassium dichromate standard solution and it will turn purple, which means divalent The ...

Embodiment 2

[0034] Embodiment 2 of the present invention provides a method for removing iron that reduces the accumulation of iron ions in the electrowinning solution, and the method is implemented through the following steps:

[0035]Step 1, add the electrowinning solution obtained by the electrowinning process into the first iron removal reaction tank, and then add sodium chlorate solution to the first iron removal reaction tank at a flow rate of 85-170 L / h, and control the The amount of sodium solution added controls the potential of the feed liquid in the first iron removal reaction tank at 550-580mv, reacts at 60°C, oxidizes the ferrous ions in the electrowinning solution to ferric ions, and takes samples to detect the ferrous iron Specifically, take 1mL of the filtrate of the first iron removal reaction tank, add the indicator, the indicator is potassium dichromate standard solution, drop a drop of potassium dichromate standard solution and it will turn purple, which means divalent ...

Embodiment 3

[0040] Embodiment 3 of the present invention provides a method for removing iron by reducing the accumulation of iron ions in the electrowinning solution, the method is implemented through the following steps:

[0041] Step 1, add the electrowinning solution obtained by the electrowinning process into the first iron removal reaction tank, and then add sodium chlorate solution to the first iron removal reaction tank at a flow rate of 85-170 L / h, and control the The amount of sodium solution added controls the potential of the feed liquid in the first iron removal reaction tank at 550-580mv, reacts at 65°C, oxidizes ferrous ions in the electrowinning solution to ferric ions, and takes samples to detect ferrous iron Specifically, take 1mL of the filtrate of the first iron removal reaction tank, add the indicator, the indicator is potassium dichromate standard solution, drop a drop of potassium dichromate standard solution and it will turn purple, which means divalent The content ...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/08C25C7/06
CPCC25C1/08C25C7/06
Inventor 李炳忠张爱青王博伍一根许东伟史齐勇
Owner GEM JIANGSU COBALT IND CO LTD
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