Method for treating nickel and cadmium impurities in cobalt sulfate solution

The technology of cobalt sulfate solution and cobalt sulfate is applied in the field of cadmium impurity and nickel treatment in cobalt sulfate solution, which can solve the problems of outputting a single cobalt chloride solution, large excess coefficient of zinc powder and high treatment cost, and achieves good removal effect, Good economic value, simple process effect

Inactive Publication Date: 2018-12-18
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above two methods, as the main method for processing crude cobalt sulfate solution under the sulfate system, mainly have the following disadvantages: 1) method one uses zinc powder to replace cadmium, the excess coefficient of zinc powder is large, and the Zn introduced from the replacement reaction 2+ , which increases the burden of the subsequent P204 extraction process, and the processing cost is high
2) Although method 2 does not increase the total amount of impurities, the cadmium-containing cobalt chloride solution produced must be treated again with cadmium-removing resin
3) Due to the limitation that the domestic cadmium removal resin is only suitable for the chloride salt system, the second method can only produce a single cobalt chloride solution. If the cobalt sulfate solution is produced, it is necessary to use the P204 extractant to transform again

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Adjust the pH value of the cobalt sulfate raw material solution to 3.0, and the organic phase is composed of extractant P507 and diluent sulfonated kerosene, wherein the H of the extractant P507 + The concentration is 0.73mol / L, the nickel soap organic nickel load is 13.67g / L, the extraction ratio is O / A=4 / 1, 7-stage countercurrent extraction, so that cobalt and cadmium are transferred to the organic phase while nickel is retained in the water phase , and then use dilute hydrochloric acid to carry out 6-stage countercurrent washing to the organic phase. The washing ratio is O / A=18 / 1. The nickel and cadmium in the organic phase are separated and incorporated into the extraction feed stage. After washing, the organic phase is then washed with dilute hydrochloric acid. 5-stage stripping to produce cobalt chloride stripping solution.

[0042] The composition of the produced cobalt chloride stripping solution is Co: 122.59g / L, Ni: 0.0062g / L, Cd: 0.00071g / L, Na: 0.027g / L, pH3...

Embodiment 2

[0046]Adjust the pH value of the cobalt sulfate raw material solution to 4.5, and the organic phase is composed of extractant P507 and diluent sulfonated kerosene, wherein the H of the extractant P507 + The concentration is 0.80mol / L, the nickel soap organic nickel load is 14.07g / L, the extraction ratio is O / A=3 / 1, 7-stage countercurrent extraction, so that cobalt and cadmium are transferred to the organic phase while nickel is retained in the water phase , and then use dilute hydrochloric acid to carry out 6-stage countercurrent washing to the organic phase. The washing ratio is O / A=20 / 1. The nickel and cadmium in the organic phase are separated and incorporated into the extraction feed stage. After washing, the organic phase is then washed with dilute hydrochloric acid. 5-stage stripping to produce cobalt chloride stripping solution.

[0047] The composition of the produced cobalt chloride stripping solution is Co: 124.57g / L, Ni: 0.0041g / L, Cd: 0.00076g / L, Na: 0.039g / L, pH3....

Embodiment 3

[0051] The cobalt sulfate raw material liquid is adjusted to a pH value of 4.0, and the organic phase is composed of an extractant P507 and a diluent sulfonated kerosene, wherein the H of the extractant P507 + The concentration is 0.60mol / L, the nickel soap organic nickel load is 9.83g / L, the extraction ratio is O / A=5 / 1, 7-stage countercurrent extraction, so that cobalt and cadmium are transferred to the organic phase while nickel is retained in the water phase , and then use dilute hydrochloric acid to carry out 6-stage countercurrent washing on the organic phase. The washing ratio is O / A=15 / 1. The nickel and cadmium in the organic phase are separated and incorporated into the extraction feed stage. After washing, the organic phase is washed with dilute sulfuric acid. 5-stage back-extraction to produce cobalt sulfate back-extraction liquid.

[0052] The composition of the produced cobalt sulfate stripping solution is Co: 108.92g / L, Ni: 0.0053g / L, Cd: 0.00067g / L, Na: 0.044g / L,...

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Abstract

The invention discloses a method for treating nickel and cadmium impurities in cobalt sulfate solution. The method includes the steps that (1) the pH value of cobalt sulfate raw material liquid is adjusted; (2) P507 nickel soap is prepared, an extraction agent P507 and a diluent sulfonated kerosene are mixed, industrial NaOH (concentration being 30% or 45%) and nickel soap anterior liquid are usedin sequence for counter current extraction, and the formed organic phase is the P507 nickel soap; (3) extraction is conducted, the P507 nickel soap is used for extracting cobalt and cadmium; (4) washing is conducted, the dilute hydrochloric acid is used to wash nickel and cadmium; and (5) back extraction is conducted, and back extraction is conducted with the dilute hydrochloric acid or dilute sulfuric acid to produce cobalt chloride or cobalt sulfate solution. By means of the method, the nickel and cadmium impurities can be effectively removed from the cobalt sulfate solution, the process issimple and reliable, the maneuverability is high, the nickel, cadmium and other impurities removal effect is high, other impurities cannot be introduced, and the better economic value is achieved.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal smelting, and relates to a method for treating nickel and cadmium impurities in cobalt sulfate solution. Background technique [0002] Industrial cobalt sulfate, the molecular formula is CoSO 4 ·7H 2 O, rose red crystal, red powder after dehydration, soluble in water and methanol, slightly soluble in ethanol, used in ceramic glaze, paint drier, electroplating, battery and other fields. With the rapid development of my country's economy, it has driven The new energy automobile industry has a strong demand for cobalt sulfate products for batteries. [0003] Regarding the removal of impurity ions such as nickel and cadmium in the crude cobalt sulfate solution, there are currently two general methods: method one is crude cobalt sulfate solution→zinc powder replacement to remove cadmium→P204 extraction to remove zinc→P507 extraction to enrich cobalt→refining Cobalt sulfate solution or cobalt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00C22B3/38
CPCC22B23/0453C22B23/0484C22B3/3846Y02P10/20
Inventor 叶剑鸣王强赵晓龙秦雪萍孟茂勇张霞
Owner JINCHUAN GROUP LIMITED
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