Cobalt and nickel extraction separation method capable of reducing coextraction

A separation method and extraction technology, which is applied in the field of cobalt and nickel separation and recovery, can solve the problems of reduced cobalt and nickel separation efficiency, reduced nickel co-extraction, and reduced co-extraction, so as to reduce co-extraction phenomenon, improve extraction and separation efficiency, and reduce co-extraction rate effect

Active Publication Date: 2018-05-08
HUAZHONG UNIV OF SCI & TECH
View PDF7 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a co-extraction-reducing co-nickel extraction and separation method, which fully combines the characteristics and requirements of cobalt-nickel extraction and separation, and specifically proposes the use of a buffer mechanism to maintain cobalt-nickel During the extraction process, the pH of the aqueous phase is within the optimum pH range for extracting cobalt rather than the optimum pH range for nickel. At the same time, the key process parameters in the extraction process are controlled and adjusted to maintain the buffering capacity of the buffer solution, thereby reducing the cobalt content of nickel. Extraction, thereby solving the technical problem that the co-extraction of nickel is serious due to the pH change of the feed liquid in the extraction process when the prior art uses extraction to separate cobalt and nickel, which eventually leads to a decrease in the separation efficiency of cobalt and nickel

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cobalt and nickel extraction separation method capable of reducing coextraction
  • Cobalt and nickel extraction separation method capable of reducing coextraction
  • Cobalt and nickel extraction separation method capable of reducing coextraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The separation method steps of the present embodiment are as follows:

[0057] (1) Extraction of cobalt in sulfuric acid leaching solution

[0058] The concentrations of cobalt and nickel in the sulfuric acid leaching solution of the positive electrode material of lithium-ion batteries are 17.10g / L and 4.53g / L respectively. First, adjust the pH to 4.0-4.5 with sodium hydroxide, filter to remove trace impurities, and then adjust with glacial acetic acid and sodium hydroxide. The pH of the leaching solution was adjusted to 5.2 (n(Co):n(acetic acid)=1:34.5), and the leaching solution was diluted 5 times at the same time. Use 0.4mol / L P507 with a saponification rate of 70% for extraction, the ratio O / A is 1:1, 25°C, 150 rpm, shaking extraction for 15min, the cobalt and nickel in the raffinate (water phase) The contents of 0.10g / L and 0.82g / L respectively, the equilibrium pH=5.45, △pH=0.25, and the primary extraction efficiencies of cobalt and nickel are 97.0% and 9.49% res...

Embodiment 2

[0065] The separation method steps of the present embodiment are as follows:

[0066] (1) Extraction of cobalt in sulfuric acid leaching solution

[0067] The concentrations of cobalt and nickel in the sulfuric acid leaching solution of the cathode material of lithium ion batteries are 16.40g / L and 4.85g / L respectively, and the pH of the leaching solution is adjusted to 5.4 with glacial acetic acid and sodium hydroxide (n(Co):n(acetic acid)=1:38 ), while the leachate was diluted 5 times, extracted with 0.4mol / L P507 with a saponification rate of 62%, compared to O / A of 1:1, 25°C, rotating speed 150 rpm, shaking extraction for 15min, raffinate The contents of cobalt and nickel in the (water phase) are 0.12g / L and 0.89g / L respectively, the equilibrium pH=5.58, △pH=0.18, and the primary extraction efficiencies of cobalt and nickel are 96.34% and 8.25% respectively.

[0068] Under the same extraction conditions as above, the above raffinate was extracted for the second time with ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
saponificationaaaaaaaaaa
extraction efficiencyaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the field of cobalt and nickel separation recycling, and particularly relates to a cobalt and nickel extraction separation method capable of reducing coextraction. The separation method sufficiently combines the characteristics and needs of cobalt and nickel extraction and separation, a buffer action mechanism is used for maintaining the water phase pH to be within the optimal pH range of cobalt rather than the optimal pH range of the nickel in the cobalt and nickel extraction process, meanwhile, key process parameters in the extraction process are controlled and adjusted, the buffer capacity of a buffer solution is maintained, the coextraction of nickel is reduced, and the technical problem that during cobalt and nickel extraction and separation in the prior art,due to the fact that in the extraction process, pH of liquid rises, nickel co-extraction is serious, and finally, the cobalt and nickel separation efficiency is reduced is solved.

Description

technical field [0001] The invention belongs to the field of separation and recovery of cobalt and nickel, and more specifically relates to a method for extracting and separating cobalt and nickel that reduces co-extraction of cobalt and nickel. Background technique [0002] Cobalt and nickel are two very important non-ferrous metals. They are important raw materials for the manufacture of some alloy materials such as anti-oxidation alloys, high-strength alloys, and precision instrument alloys. They are two important constituent metals in lithium battery materials. Because the chemical properties of cobalt and nickel are very similar, they are often symbiotic and associated in ore deposits, so nickel is often contained in various cobalt-containing waste slags, such as nickel smelting converter slag, copper smelting cobalt-containing converter slag, nickel refining cobalt-containing slag, etc. Cobalt and nickel are also contained in special alloy materials, battery materials,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00C22B3/38
CPCC22B23/0484C22B3/3844Y02P10/20
Inventor 赵云斌张可
Owner HUAZHONG UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap