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Method for removing calcium magnesium slag and recycling lithium and preparing ternary precursor material

A calcium-magnesium slag and precursor technology, which is applied in the field of wet recycling of waste lithium batteries, can solve the problems of reducing the recovery rate of valuable metals, and achieve high recovery rate, high separation efficiency and good quality.

Active Publication Date: 2019-05-10
江西赣锋循环科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of decalcified magnesium slag contains a large amount of valuable metals nickel, cobalt, manganese, lithium, etc., but the article only involves the recovery of lithium, which greatly reduces the recovery rate of valuable metals

Method used

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  • Method for removing calcium magnesium slag and recycling lithium and preparing ternary precursor material
  • Method for removing calcium magnesium slag and recycling lithium and preparing ternary precursor material
  • Method for removing calcium magnesium slag and recycling lithium and preparing ternary precursor material

Examples

Experimental program
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Effect test

Embodiment 1

[0086] (1) Magnesium salt transformation: remove 200kg of calcium and magnesium slag and 0.54m 3 The concentration of magnesium ions is 77g / L magnesium chloride solution to make a slurry, the amount of magnesium salt added is 1.1 times of the theoretical mass required for all leaching of cobalt, nickel, manganese and lithium in calcium magnesium slag, and then the pH value of the system is adjusted with 20L hydrochloric acid Adjust to 3.0. Turn on the heating, keep the system temperature at 95°C and stir for 1 hour, then filter at a stirring rate of 200rpm / s to obtain 0.52m 3 Transformation fluid. The analysis results of the main components of the transformation fluid are shown in Table 1 as follows:

[0087] Table 1 Analysis results of main components of transformation fluid

[0088] element

co

Ni

mn

Li

Ca

Mg

Fe

Al

Contentg / L

12.80

29.03

15.06

28.5

3.2

13

0.001

0.002

[0089] (2) Immersion nickel ...

Embodiment 2

[0100] This embodiment is further optimized on the basis of embodiment 1, specifically:

[0101]S1: alkalization to remove magnesium: to the 0.46m obtained in step (2) 3 Add 0.1m to the crude lithium solution 3 32wt% sodium hydroxide solution, adjust the pH value of the solution to 12.0. Stir for 1h and filter to get 0.52m 3 Refined lithium solution. The main component analysis results of the refined lithium solution are shown in Table 3 as follows:

[0102] Table 3 Analysis results of main components of refined lithium solution

[0103] element

[0104] S2: Preparation of lithium carbonate: heat up the refined lithium solution to 95°C, then slowly add 300g / L sodium carbonate solution 0.37m 3 , stirred for 0.5h and filtered at a stirring rate of 250rpm / s. Filter residue obtains 75.77kg lithium carbonate product through washing, drying again. Lithium carbonate product specification is shown in Table 13,14 in the present embodiment.

Embodiment 3

[0106] (1) Magnesium salt transformation: remove 200kg of calcium and magnesium slag and 0.6m 3 The concentration of magnesium ions is 61g / L magnesium sulfate solution to make a slurry, the amount of magnesium salt added is 1.2 times of the theoretical amount required for the leaching of cobalt, nickel, manganese and lithium in the calcium-magnesium slag, and then the pH of the system is adjusted with 20L concentrated sulfuric acid Adjust the value to 1.0. Turn on the heating, keep the system temperature at 95°C and stir for 1 hour, then filter at a stirring rate of 200rpm / s to obtain 0.63m 3 Transformation fluid. The main component analysis results of transformation fluid are shown in Table 5 as follows:

[0107] Table 5 Analysis results of main components of transformation fluid

[0108] element

co

Ni

mn

Li

Ca

Mg

Fe

Al

Contentg / L

6.3

14.6

3.2

22.1

1.1

8.5

0.002

0.001

[0109] (2) Precipitated cob...

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Abstract

The invention discloses a method for removing calcium magnesium slag and recycling lithium and preparing a ternary precursor material, and belongs to the field of waste lithium ion battery wet recycling. The method comprises the following steps of (1) magnesium salt transformation, (2) cobalt, nickel and manganese precipitation, (3) alkalization and magnesium removal, (4) lithium carbonate preparation, (5) nickel, cobalt and manganese slag acid leaching, (6) calcium magnesium removal, (7) extraction, (8) precursor synthesis, and (9) ternary precursor material preparation by drying. The technology is simple, is low in energy cost and is safe and stable. Efficiency of separating the cobalt, the nickel and the manganese from lithium is high, and the comprehensive recycling rate of each valuable metal is high. The main content of prepared lithium carbonate is up to 99.61%, the battery level requirements can be met, the overall recycling rate of the nickel, the cobalt, the manganese and thelithium in the calcium magnesium slag is up to 98.5%, and the lithium recycling rate is up to 98.8%. The method is suitable for industrial production, and can achieve high economic benefits.

Description

technical field [0001] The invention relates to the field of wet recovery of waste lithium batteries, in particular to a method for recovering lithium from calcium and magnesium slag and preparing a ternary precursor material. Background technique [0002] Lithium batteries are widely used in mobile phones, computers, cameras and other digital products because of their advantages such as high energy density, high open circuit voltage, fast charging and discharging speed, and long life. With my country vigorously developing the new energy automobile industry, the lithium battery industry has shown explosive growth in recent years. According to GGII research data, China's power battery output was 44.5GWh in 2017, accounting for more than 50% of the global total. my country has become the world's largest lithium battery production and consumption market. [0003] After nearly a thousand charge-discharge cycles of a lithium battery, its internal working ions will gradually lose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/00C22B3/40C22B26/12C22B47/00C22B23/00H01M10/54C01D15/08C01G53/00
CPCY02W30/84Y02P10/20
Inventor 李良彬刘超彭伟文章小明马木林熊训满江文波李玲玲白有仙王超强谢绍忠
Owner 江西赣锋循环科技有限公司
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