A kind of cobalt nickel extraction separation method that reduces co-extraction

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: 2019-07-09
HUAZHONG UNIV OF SCI & TECH
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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

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  • A kind of cobalt nickel extraction separation method that reduces co-extraction
  • A kind of cobalt nickel extraction separation method that reduces co-extraction
  • A kind of cobalt nickel extraction separation method that reduces co-extraction

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Embodiment 1

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

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

[0058] The concentration of cobalt and nickel in the sulfuric acid leaching solution of the positive electrode material of lithium ion battery is 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), while the leaching solution was diluted 5 times. Extraction with 0.4mol / L P507 with a saponification rate of 70%, O / A ratio of 1:1, 25°C, rotating speed of 150 rpm, shaking extraction for 15min, cobalt and nickel in the raffinate (water phase) The content of 0.10g / L and 0.82g / L respectively, equilibrium pH=5.45, ΔpH=0.25, the primary extraction efficiency of cobalt and nickel were 97.0% and 9.49%, respectively.

[0...

Embodiment 2

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

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

[0067] The concentration of cobalt and nickel in the sulfuric acid leaching solution of the cathode material of lithium ion battery is 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 ), at the same time 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 / min, shaken for 15min extraction, raffinate The content of cobalt and nickel in (aqueous phase) were 0.12g / L and 0.89g / L, respectively, the equilibrium pH=5.58, ΔpH=0.18, and the primary extraction efficiencies of cobalt and nickel were 96.34% and 8.25%, respectively.

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

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Abstract

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. This separation method fully combines the characteristics and requirements of cobalt-nickel extraction and separation, and proposes to use the buffer mechanism to maintain the pH of the aqueous phase in the cobalt-nickel extraction process in the optimal pH range of cobalt instead of the optimal pH range of nickel, and at the same time, the extraction process Control and adjust the key process parameters in the medium, maintain the buffering capacity of the buffer solution, and reduce the co-extraction of nickel, thereby solving the problem of severe nickel co-extraction due to the increase in the pH of the feed solution during the extraction process of the existing technology when extracting and separating cobalt and nickel, which eventually leads to Technical problem of reduced cobalt-nickel separation efficiency.

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

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/00C22B3/38
CPCC22B23/0484C22B3/3844Y02P10/20
Inventor 赵云斌张可
Owner HUAZHONG UNIV OF SCI & TECH
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