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A method for recovering lithium from calcium and magnesium slag and preparing ternary precursor material

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

Active Publication Date: 2021-01-08
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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  • A method for recovering lithium from calcium and magnesium slag and preparing ternary precursor material
  • A method for recovering lithium from calcium and magnesium slag and preparing ternary precursor material
  • A method for recovering lithium from calcium and magnesium slag and preparing ternary precursor material

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Experimental program
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Effect test

Embodiment 1

[0086] (1) Magnesium salt transformation: Take 200kg of calcium-magnesium slag and 0.54m³ magnesium chloride solution with a magnesium ion concentration of 77 g / L to make a slurry. It needs to be 1.1 times the theoretical mass, and then adjust the pH value of the system to 3.0 with 20L hydrochloric acid. Turn on the heating, keep the system temperature at 95°C and stir for 1 hour, then filter at a stirring rate of 200rps to obtain 0.52 m³ transformation liquid. 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) Immerse nickel, cobalt and manganese: convert the cobalt, nickel and manganese in the 0.52 m³ transformation solution obtained above into nickel hydroxide, cobalt and manganese, and add 45kg o...

Embodiment 2

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

[0101]S1: Alkalinization to remove magnesium: add 0.1 m³ 32wt% sodium hydroxide solution to the 0.46 m³ crude lithium solution obtained in step (2), and adjust the pH value of the solution to 12.0. Stir for 1 h and filter to obtain 0.52 m³ of 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 co Ni mn Li Ca Mg Fe Al Contentg / L 0.0001 not detected 0.0005 28.47 0.12 0.0001 0.0005 0.0002

[0104] S2: Preparation of lithium carbonate: heat up the refined lithium solution to 95°C, then slowly add 0.37m³ of 300g / L sodium carbonate solution, stir for 0.5h and filter, with a stirring rate of 250 rps. Filter residue obtains 75.77kg lithium carbonate product through washing, drying ...

Embodiment 3

[0106] (1) Magnesium salt transformation: Take 200kg of calcium-magnesium slag and 0.6m³magnesium ion concentration of 61 g / L magnesium sulfate solution to make a slurry. 1.2 times of the required theoretical amount, and then adjust the pH value of the system to 1.0 with 20L concentrated sulfuric acid. Turn on the heating, keep the system temperature at 95°C and stir for 1 hour, then filter at a stirring rate of 200rps to obtain 0.63 m³ transformation liquid. 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 cobalt-nickel-manganese: According to the step (1), the cobalt, nickel, and manganese in the 0.63 m³ transformation solution are all converted into nickel hydroxide, cobalt-manganese, and 1.1 times...

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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 Patents(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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