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Method for controlling pH change in process of removing manganese through acidic extracting agent

An acidic extractant and extraction technology, which is applied in the field of metal separation and recovery, can solve the problems of cumbersome operation and the inability to predetermine the amount of acid and alkali, and achieve the effect of solving difficult pH adjustment, good pH constant, and simple operation

Active Publication Date: 2018-12-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention solves the technical problem that the pH control method in the process of removing manganese by the acidic extractant in the prior art is cumbersome to operate, and the amount of acid and alkali cannot be determined in advance

Method used

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  • Method for controlling pH change in process of removing manganese through acidic extracting agent
  • Method for controlling pH change in process of removing manganese through acidic extracting agent
  • Method for controlling pH change in process of removing manganese through acidic extracting agent

Examples

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Embodiment 1

[0027] In this embodiment, a method for controlling pH changes in the process of manganese removal by an acidic extractant comprises the following steps:

[0028] (1) adding alkali to the acid solution with an acidity coefficient of 3-5 to obtain a buffer solution with a pH value of 4-4.5;

[0029] (2) adding the buffer solution described in step (1) to the manganese feed liquid to be adjusted to 4.0-5.0 in pH, so that the concentration of manganese ions is less than 6g / L, and adjusting the pH to 3.8-4.2 with acid or alkali, to obtain a mixed solution;

[0030] (3) carry out multistage extraction to the mixed solution described in step (2) with acidic extractant solution, to remove the manganese ion in the manganese feed liquid to be removed; The concentration of described acidic extractant solution is less than or equal to 0.4mol / L, Between the amount of the total substance of the acidic extractant in the used acidic extractant solution of the described multistage extraction...

Embodiment 2

[0035] This embodiment is a method for removing manganese from a ternary positive electrode material of a 111-type lithium-ion battery, and the flow chart is as follows figure 2 shown, with the following steps:

[0036] 1. Leaching of cobalt, nickel and manganese in battery cathode materials

[0037] Weigh 10g waste lithium-ion battery cathode material powder, select H 2 SO 4 +H 2 o 2 As a leaching agent, it is leached under reflux by heating a magnetic stirrer at a constant temperature. h 2 SO 4 Concentration is 2.5mol / L, H 2 o 2 The concentration is 2.0mL / g, the leaching temperature is 85°C, the leaching time is 120min, and the liquid-solid ratio is 10:1. Adjust the pH of the leached feed solution to 4.0-5.0, filter the precipitate, and dilute to volume in a 250mL volumetric flask. As determined by atomic absorption spectrometry, the contents of each element in the leachate are: Co: 6.553g / L; Ni: 6.839g / L; Mn: 6.081g / L.

[0038] 2. Manganese removal by extraction...

Embodiment 3

[0050] This embodiment is a method for removing manganese from the positive electrode material of a high-cobalt lithium-ion battery, and the flow chart is as follows figure 2 shown, with the following steps:

[0051] 1. Leaching of cobalt, nickel and manganese in battery cathode materials

[0052] The leaching method and process are the same as in Example 2. The content of each element in the obtained leachate is respectively: Co: 14.60g / L; Ni: 3.86g / L; Mn: 2.212g / L.

[0053] 2. Manganese removal by extraction of leachate

[0054] Pipette 5.7mL of glacial acetic acid, add appropriate amount of distilled water to dilute, and adjust the pH of the solution to slightly greater than 4 with solid sodium hydroxide. Then add 25mL of the above-mentioned leached battery feed solution to it, and use a little sodium hydroxide solution and sulfuric acid solution to fine-tune the pH of the mixed solution to 4.0, and constant volume in a 100mL volumetric flask. Among them, the contents ...

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Abstract

The invention discloses a method for controlling pH change in the process of removing manganese through an acidic extracting agent, and belongs to the technical field of metal separation and recycling. The method comprises the steps that alkali is added to an acid solution with the acidity coefficient being 3 to 5, and a buffer solution is obtained; the buffer solution is added to feed liquid needing to be subjected to manganese removing, the pH is adjusted to 3.8 to 4.2, the concentration of manganese ions in the feed liquid needing to be subjected to manganese removing is lower than 6g / L, and a mixed solution is obtained; and the mixed solution is subjected to multistage extraction through an acidic extracting agent, so that the manganese ions in the feed liquid needing to be subjected to manganese removing are removed. Through the method, strong alkali or strong acid does not need to be added in the extraction process, the pH value of the solution does not need to be tested, and effective control over the pH change of the feed liquid in the process of removing manganese through the acidic extracting agent can be achieved.

Description

technical field [0001] The invention belongs to the technical field of metal separation and recovery, and more specifically relates to a method for controlling pH changes in the process of removing manganese with an acidic extractant. Background technique [0002] With the depletion of energy and the urgent need for sustainable and clean energy, lithium-ion batteries are more and more widely used in electronic equipment, electric vehicles, industrial instruments and medical equipment, and their output is also growing at a rapid rate . The rapid growth in demand for lithium-ion batteries has led to a substantial increase in the demand for cobalt and nickel. Cobalt and nickel mainly come from the recycling of ore and cobalt and nickel. [0003] Solvent extraction is the most commonly used technique for separating cobalt and nickel from secondary resources such as ores and spent lithium batteries. The feed liquid obtained after processing cobalt-nickel ore or waste materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/38C22B23/00C22B7/00
CPCC22B7/007C22B23/0453C22B3/3842C22B3/3844C22B3/3846Y02P10/20
Inventor 赵云斌张亚茹
Owner HUAZHONG UNIV OF SCI & TECH
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