CN-121992218-A - Ion exchange column analysis process for cobalt electrowinning production of chloride system

CN121992218ACN 121992218 ACN121992218 ACN 121992218ACN-121992218-A

Abstract

The invention discloses an ion exchange column analysis process for cobalt electrowinning of a chloride system, belongs to the field of hydrometallurgy, and solves the problems of high reagent consumption and high wastewater generation in the existing analysis process. The method comprises the steps of evacuating cobalt chloride solution in an ion exchange column after resin in the ion exchange column is saturated, adopting four sections of countercurrent soaking and washing to analyze cobalt adsorbed by the ion exchange resin, adopting new water as a fourth section of soaking and washing liquid medium, recycling the new water for a third section of soaking and washing, recycling the third section of soaking and washing liquid for a second section of soaking and washing, recycling the second section of soaking and washing liquid for the first section of soaking and washing, obtaining the cobalt chloride solution after the first section of soaking and washing as a production raw material, adopting hydrochloric acid solution to soak and analyze the ion exchange resin after soaking and washing, and washing by using the new water. The invention adopts four sections of countercurrent soaking and washing, the soaking and washing liquid after each section of soaking and washing is recycled and the upper section of soaking and washing, the cobalt in the wastewater is enriched, the wastewater is prepared into cobalt chloride solution, the cobalt chloride solution can be used as a raw material, and the cobalt chloride solution can be directly put into a cobalt chloride-electrowinning production process, so that the direct yield of cobalt is improved.

Inventors

YUE ZHIZHOU
Gao Haiyin
ZHOU LINHUA
LU XIAOFANG
LIU JIALE
HU YONGJI
AI LING

Assignees

金川集团镍钴股份有限公司
兰州金川新材料科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260212

Claims (5)

1. An ion exchange column analysis process for the production of electrodeposited cobalt in a chlorination system is characterized by comprising the following steps: A. After the resin in the ion exchange column is saturated, evacuating cobalt chloride solution in the column; B. Adopting four sections of countercurrent soaking and washing to analyze cobalt adsorbed by the ion exchange resin, wherein the medium of the fourth section of soaking and washing liquid is new water, the new water is reused for the third section of soaking and washing, the third section of soaking and washing liquid is reused for the second section of soaking and washing, the second section of soaking and washing liquid is reused for the first section of soaking and washing, and the cobalt chloride solution obtained after the first section of soaking and washing is reused as a production raw material; C. soaking and resolving the ion exchange resin subjected to soaking and washing in the step B by adopting hydrochloric acid solution; D. washing with fresh water, and resolving at pH 4-5.
2. The ion exchange column resolution process for the production of cobalt by an electrowinning system of claim 1, wherein the resin in the ion exchange column comprises one or more of D201, D751, and D363.
3. An ion exchange column resolution process for the production of cobalt by electro-winning of a chloride system as in claim 1 or 2, wherein in step B, the soaking time is 0.5-2h.
4. An ion exchange column resolution process for the production of cobalt by electro-winning of a chloride system as in claim 1 or 2, wherein in step C, the concentration of hydrochloric acid solution is 1-3mol/L.
5. The process for resolving an ion exchange column for cobalt production by an electro-winning system of chloride according to claim 4, wherein in step C, the hydrochloric acid soaking time is 4-8 hours.

Description

Ion exchange column analysis process for cobalt electrowinning production of chloride system Technical Field The invention belongs to the field of hydrometallurgy, and particularly relates to an ion exchange column analysis process for cobalt production by a chloride system. Background Electrodeposited cobalt is one of the important raw materials for manufacturing high-temperature alloys, hard alloys and magnetic alloys. The current preparation system of electrodeposited cobalt comprises a chlorination system and a sulfuric acid system. The chlorination system is commonly used in high-end markets due to low viscosity, high conductivity, fine grains, high density and bright and smooth surface. The cobalt chloride solution is subjected to deep purification and impurity removal, and is subjected to electrodeposition after being mixed with catholyte and dechlorinated anolyte. And (3) carrying out gas-liquid separation after negative pressure pumping of the anolyte and the chlorine, recycling the anolyte after dechlorination and evaporation, and enabling the chlorine produced by the anode to enter a chlorine recycling process. The cobalt chloride solution contains As, pb, cd, cu and other impurities, the ion potential of the impurities is correct, and the impurities are easy to deposit on a plate surface. Ion exchange is generally adopted to remove impurities, control the concentration of impurity metal ions and improve the concentration ratio of cobalt to the impurity metal ions so as to inhibit the deposition of the impurity metal ions. After the ion exchange column is saturated, a large amount of reagents such as acid and alkali are needed for analysis and regeneration. The main metal and the impurity metal ions are resolved by hydrochloric acid, the acidity of the resolved solution and the concentration of the metal ions are high, the resolved solution can only be reused in the raw material pulping process, the flow is long, and the amount of waste water is large. In actual production, the washing speed of the ion exchange column is slower due to wastewater treatment, which restricts production. Disclosure of Invention The invention aims to provide an ion exchange column analysis process for the production of electrodeposited cobalt in a chlorination system, which aims to solve the problems of high reagent consumption and high wastewater generation in the existing analysis process. The technical scheme of the invention is that the ion exchange column analysis process for the production of the electrodeposited cobalt of the chloridizing system comprises the following steps: A. after the resin in the ion exchange column is saturated, the cobalt chloride solution in the column is emptied to a cobalt liquid tank; B. Adopting four sections of countercurrent soaking and washing, resolving (namely whitening) cobalt adsorbed by ion exchange resin, wherein the medium of the fourth section of soaking and washing liquid is new water, the new water is reused for the third section of soaking and washing, the third section of soaking and washing liquid is reused for the second section of soaking and washing, the second section of soaking and washing liquid is reused for the first section of soaking and washing, the cobalt chloride solution is obtained after the first section of soaking and washing, the cobalt chloride solution is discharged to a cobalt liquid tank, and the solution in the cobalt liquid tank is reused as a production raw material for production; C. soaking and resolving the ion exchange resin subjected to soaking and cleaning in the step B by adopting hydrochloric acid solution, and conveying the resolved solution to a P507 process after preparing acid; D. washing with fresh water, and resolving at pH 4-5. As a further improvement of the present invention, the ion exchange column resin comprises one or more of D201, D751, D363. As a further improvement of the invention, in the step B, the soaking time is 0.5-2h. As a further improvement of the present invention, in step C, the hydrochloric acid solution concentration is 1 to 3mol/L. As a further improvement of the invention, in the step C, the hydrochloric acid soaking time is 4-8h. The beneficial effects of the invention are as follows: 1. the invention optimizes the ion exchange column analysis process, adopts four sections of countercurrent soaking and washing, the soaking and washing liquid after each section of soaking and washing is recycled and the upper section of soaking and washing, and the cobalt in the wastewater is enriched to prepare cobalt chloride solution, which can be used as raw material and directly put into the cobalt chloride-electrowinning production process, thereby improving the direct yield of cobalt. 2. According to the invention, the main metal ion cobalt attached on the resin is cleaned in advance through four-stage countercurrent soaking and washing, then hydrochloric acid soaking and analysis are carried out, so that the conc