Method of preparing battery level lithium carbonate by using salt lake lithium ores

A lithium carbonate, battery-level technology, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems of low output, unfavorable industrial production, long process flow, etc.

Inactive Publication Date: 2018-03-27
GANFENG LITHIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the above two methods are long process flow, high energy consumption, high cost, low output and low production efficiency, which are not conducive to realizing industrialized production

Method used

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  • Method of preparing battery level lithium carbonate by using salt lake lithium ores
  • Method of preparing battery level lithium carbonate by using salt lake lithium ores
  • Method of preparing battery level lithium carbonate by using salt lake lithium ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A. Ball mill crushing: Put the massive lithium salt ore into a ball mill and crush it into particles of 0.02mm-0.08mm. Lithium salt ore composition is as shown in table 1:

[0060] Table 1 Lithium salt ore composition (unit: %)

[0061] Li

Na

K

Ca

Mg

Fe

B

Al

h 2 o

10.65

6.1

1.8

0.38

0.42

0.022

0.13

0.031

13.59

[0062]B. Slurry and washing of sodium, potassium and boron to prepare crude lithium salt ore: adjust 0.02mm-0.08mm granular lithium salt ore and tap water into a slurry at a liquid-solid ratio of 2:1, heat up to 95°C, stir and wash for 1 hour, Centrifuge to obtain crude lithium salt ore. Among them, the removal rate of potassium is 83.15%, and the removal rate of boron is 75.6%.

[0063] Crude lithium salt ore composition is as shown in table 2:

[0064] Table 2 Crude lithium salt ore composition (unit: %)

[0065] Li

Na

K

Ca

Mg

Fe

B

Al

h 2 o ...

Embodiment 2

[0080] A. Ball mill crushing: Put the massive lithium salt ore into a ball mill and crush it into particles of 0.02mm-0.08mm. Lithium salt ore composition is shown in Table 6:

[0081] Table 6 lithium salt ore composition (unit: %)

[0082]

[0083]

[0084] B. Slurry washing of sodium, potassium, and boron: Mix 0.02mm-0.08mm granular lithium salt ore and tap water into a slurry at a liquid-solid ratio of 3:1, heat up to 90°C, stir and wash for 40 minutes, and centrifuge to obtain crude lithium salt mine. Among them, the removal rate of potassium is 86.12%, and the removal rate of boron is 72.84%.

[0085] Crude lithium salt ore composition is as shown in table 7:

[0086] Table 7 crude lithium salt ore composition (unit: %)

[0087] Li

Na

K

Ca

Mg

Fe

B

Al

h 2 o

12.89

0.98

0.12

0.43

0.56

0.03

0.016

0.03

13.63

[0088] C, the preparation of a refined lithium chloride solution: slowly add 31% hy...

Embodiment 3

[0100] A. Ball mill crushing: Put the massive lithium salt ore into a ball mill and crush it into particles of 0.02mm-0.08mm. The composition of lithium salt ore is shown in Table 11:

[0101] Table 11 lithium salt ore composition (unit: %)

[0102] Li

[0103] B. Slurry washing of sodium, potassium and boron: Mix 0.02mm-0.08mm granular lithium salt ore and tap water into a slurry at a liquid-solid ratio of 3:1, heat up to 100°C, stir and wash for 1 hour, and centrifuge to obtain crude lithium salt mine. Among them, the removal rate of potassium is 89.06%, and the removal rate of boron is 71.99%.

[0104] The composition of crude lithium salt ore is shown in Table 12:

[0105] Table 12 crude lithium salt ore composition (unit: %)

[0106] Li

[0107] C, the preparation of a refined lithium chloride solution: slowly add 31% hydrochloric acid to the crude lithium salt ore, adjust the reaction pH to 2 and maintain it for 15 minutes; then add 32% liquid cau...

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Abstract

The invention discloses a method of preparing battery level lithium carbonate by using salt lake lithium ores. The method comprises the following steps: A, ball-milling and crushing; crushing bulky lithium salt ore powder into granular lithium salt ores; B, preparing coarse lithium salt ores: preparing slurry from the granular lithium salt ores and water, and carrying out centrifugal separation toobtain the coarse lithium salt ores; C, preparing a coarse lithium chloride liquid: adding hydrochloric acid into the coarse lithium salt ores to adjust pH to 1-3, adjusting the pH to 9-13 with a caustic soda liquid to remove impurities, and carrying out filter pressing to obtain a primary refined lithium chloride liquid; D, introducing carbon dioxide into the primary refined lithium chloride liquid till the pH is 7 to remove calcium and carrying out filter pressing to obtain a secondary refined lithium chloride solution; E, adding the caustic soda liquid into the secondary refined lithium chloride liquid to adjust the pH to 9-12 and then adding a complexing agent, settling the mixture with sodium carbonate, and carrying out centrifugal separation to obtain coarse lithium carbonate; and F, washing and drying the coarse lithium carbonate to obtain the battery level lithium carbonate. The method of preparing battery level lithium carbonate by using salt lake lithium ores disclosed by the invention is simple in process, low in cost, high in output and high in production efficiency, and can reduce the energy consumption effectively.

Description

technical field [0001] The invention relates to a method for preparing lithium carbonate, in particular to a method for preparing battery-grade lithium carbonate by utilizing salt lake lithium ore. Background technique [0002] About 70% of lithium in the world exists in salt lakes, and about 30% of lithium comes from ores. Lithium in salt lakes is a renewable resource, while lithium in ores is a non-renewable resource. Therefore, it is particularly important to vigorously develop lithium resources in salt lakes. In my country's Tibet, there are abundant reserves of lithium resources in carbonate salt lakes. At present, the method of preparing battery-grade lithium carbonate from carbonate lithium salt ore is mainly the carbonization method. One method is to ball mill and wash the lithium salt ore once, adjust it into a slurry and carbonize it to obtain a lithium bicarbonate solution, and add a metal ion precipitant to remove impurities. , pyrolyzed to obtain crude lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
CPCC01D15/08C01P2006/80
Inventor 李良彬邓招男章小明廖萃许鑫付晓春江姚泉刘明
Owner GANFENG LITHIUM CO LTD
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