Process method for separating and purifying cobalt solution by extraction chromatography

A chromatographic separation and process method technology, applied in the field of producing high-purity cobalt solution, can solve the problems of difficult pH value control in the column, low cobalt direct yield, low efficiency, etc., and achieves reduction of irritating odor, high product quality, The effect of improving the rinsing efficiency

Inactive Publication Date: 2010-02-10
有研资源环境技术研究院(北京)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process still has problems such as difficulty in controlling the pH value in the column, low efficiency and low direct recovery of cobalt, which have become one of the main factors affecting its large-scale industrial application.

Method used

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  • Process method for separating and purifying cobalt solution by extraction chromatography

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Get 10 kilograms of water-containing macroporous adsorbent resin (buy from the market, brand HPD-100, its relevant parameters: 1, particle size: (particle diameter 0.3-1.2mm) ≥ 90%); 2, average pore diameter: 85-90 ° A; specific surface 650-700m 2 / g; adsorption flow rate: 1-4BV / h; desorption flow rate: 0.6-2BV / h; desorbent: ethanol or ethanol aqueous solution; desorbent dosage: 2-3BV) into the aqueous solution, add 2 kg of P507 extractant, Carry out adsorption treatment under the condition of stirring, prepare the extraction resin of 34%P507 after filtration, pack into the diameter and be 80mm, be long the plexiglass column of 850mm, be assembled into P507 extraction resin column, its empty volume is about About 400ml.

[0037] Add 5 liters of cobalt chloride feed liquid, wherein the cobalt concentration is 60 g / L, the pH value of the feed liquid is 4.5, and the P507 extraction resin column is rinsed until the pH value of the eluate changes from 1.7 to 3.5 and ends. ...

Embodiment 2

[0042] The test operation method is the same as in Example 1. Prepare 50% P507 extraction resin. Add 5 liters of cobalt sulfate feed solution, wherein the cobalt concentration is 80 g / L, the pH value of the feed solution is 4, and the P507 extraction resin column is rinsed until the pH value of the eluate changes from 1.7 to 3.

[0043] Then use the HAc-NaAc buffer solution with a pH value of 3 to wash the loaded P507 extraction resin, control the flow rate to be 1.2 times / h of the chromatographic column void volume, when the eluate volume is 4 times of the chromatographic column void volume When the acidity is 1 mol / L sulfuric acid solution is used instead to quickly elute the cobalt ions adsorbed by the chromatography column.

[0044] Finally, regenerate and rinse the P507 extraction resin column. The regeneration solution is 6 mol / L hydrochloric acid solution. When the volume of the eluate is 4 times the void volume of the chromatographic column, use deionized water to rin...

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Abstract

The invention discloses a process method for separating and purifying cobalt solution by extraction chromatography, which comprises the following steps that: the cobalt solution is extracted by a chromatographic column; the extracted cobalt solution is leached by a buffer system; and strip liquor is subjected to leaching-concentrating to form the high-purity cobalt solution, wherein the leacheateleached by the buffer system is HAc-NaAc buffer solution of which the pH value is between 2 and 3; the buffer leacheate is utilized to leach nickel in a P507 extraction and leaching resin column to the water phase of the leacheate; and the flow rate of the leacheate is 1.0 to 1.5 times per hour of the void volume of the chromatographic column. The P507 extraction chromatography combines the high selectivity of a liquid-liquid extraction method and the multistage property of an ion exchange method, strengthens the capability of purifying the cobalt solution and has the characteristics of simpleprocess flow, easy operation, high equipment capacity, less investment and low consumption of chemical materials. The extraction chromatographic process adopts the HAc-NaAc buffer leaching system, sothe control on the pH value in the leaching process is ensured, the leaching efficiency and the recovery efficiency of cobalt are improved, the quality of a product is high and stable, and the purityof the final product of metal cobalt is above 4N.

Description

technical field [0001] The present invention relates to using 2-ethylhexyl phosphate-2-ethylhexyl ester (HEHEHP, P507, PC-88A) as an extractant to produce high-purity cobalt by adopting a buffer elution system in the process of purifying cobalt solution by extraction chromatography solution process. Background technique [0002] The key to preparing high-purity cobalt is the deep purification of the cobalt solution, especially to make the content of nickel in the cobalt solution less than 10ppm. The purified cobalt solution is electrowinning to obtain high-purity cathode cobalt, and then the high-purity cathode cobalt is obtained by vacuum smelting. High-purity cobalt ingots with a purity greater than 4N. [0003] The purification methods of cobalt solution mainly include chemical precipitation method, ion exchange method and solvent extraction method. However, these methods are difficult to prepare high-purity cobalt solutions with a nickel content of less than 10 ppm, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/06C22B3/26
CPCY02P10/20
Inventor 陈松张力郎书玲罗岁斌
Owner 有研资源环境技术研究院(北京)有限公司
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