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Method for preparing lithium carbonate from lepidolite through sulfuric acid roasting method

A technology of sulfuric acid roasting and lepidolite, which is applied in the direction of lithium carbonate; high rate effect

Active Publication Date: 2013-06-12
GANFENG LITHIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the destruction of the crystal structure of lepidolite minerals, a large amount of Si, Al, Mg, Ca 2+ Plasma is leached with lithium ions, and it is difficult to remove impurities. At the same time, fluorine is introduced into the reaction system, which will corrode production equipment and cause environmental pollution.

Method used

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  • Method for preparing lithium carbonate from lepidolite through sulfuric acid roasting method
  • Method for preparing lithium carbonate from lepidolite through sulfuric acid roasting method
  • Method for preparing lithium carbonate from lepidolite through sulfuric acid roasting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Roasting defluorination: Roast 1000Kg lepidolite ore at 750°C with water vapor for 25 minutes for defluorination, the flow rate of water vapor is 0.005m 3 / h;

[0058] (2) Cooling and grinding: Cool the lepidolite after roasting in step (1) to room temperature, then grind it to 50 mesh, and analyze and detect Li in lepidolite 2 O content is 3.87%;

[0059] (3) Slurry: 233Kg60% (wt%, which is the mass percentage) of H 2 SO 4 Mix with the 931Kg pulverized lepidolite obtained in step (2) to form a slurry;

[0060] (4) Low-temperature roasting: put 1164Kg of mixed slurry obtained in step (3) in a rotary furnace, and roast at 200°C for 25 minutes to obtain 1028Kg of roasted material;

[0061] (5) Leaching and separation: add 2056Kg pure water to the 1028Kg roasted material obtained in step (4), stir at room temperature for 25 minutes, then centrifuge to obtain 1954Kg filtrate and 1130Kg filter residue, filter residue with 60% H 2 SO 4 Mix according to the liquid-so...

Embodiment 2

[0067] (1) Roasting defluorination: Roast 1200Kg lepidolite ore with water vapor at 950°C for 40 minutes for defluorination, the flow rate of water vapor is 0.018m 3 / h;

[0068] (2) Cooling and grinding: Cool the lepidolite after roasting in step (1) to room temperature, then grind it to 325 mesh, and analyze and detect Li in lepidolite 2 O content is 4.29%;

[0069] (3) Slurry: 446Kg mass percentage of 98% H 2 SO 4 Mix with the 1117Kg pulverized lepidolite obtained in step (2) to form a mixed slurry;

[0070] (4) Low-temperature roasting: 1563Kg of mixed slurry obtained in step (3) was placed in a rotary furnace, and roasted at 300°C for 50 minutes to obtain 1532Kg of roasted material;

[0071] (5) Leaching and separation: add 7663Kg of pure water to the 1532Kg roasted material obtained in step (4), stir at room temperature for 60 minutes, and then centrifuge to obtain 7510Kg of filtrate and 1685Kg of filter residue, the filter residue is 98% H 2 SO 4 Mix according to ...

Embodiment 3

[0077] (1) Roasting defluorination: Roast 1500Kg lepidolite ore with water vapor at 850°C for 30 minutes for defluorination, the flow rate of water vapor is 0.018m 3 / h;

[0078](2) Cooling and grinding: Cool the lepidolite after roasting in step (1) to room temperature, then grind it to 200 mesh, and analyze and detect Li in lepidolite 2 O content is 4.13%;

[0079] (3) Mixing: 398Kg70% H 2 SO 4 Mix with the 1396Kg pulverized lepidolite obtained in step (2) to form a mixed slurry;

[0080] (4) Low-temperature roasting: put the 1794Kg mixed slurry obtained in step (3) in a rotary furnace, and roast at 250°C for 30 minutes;

[0081] (5) Leaching and separation: add 4925Kg washing water (washing water in the previous step) to the 1641Kg roasted material obtained in step (4), stir at room temperature for 35 minutes, and then centrifuge to obtain 4761Kg filtrate and 1805Kg filter residue, the filter residue is used 70% H by mass 2 SO 4 Mix according to the liquid-solid mass...

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Abstract

The invention discloses a method for preparing lithium carbonate from lepidolite through a sulfuric acid roasting method, which comprises the following process steps: (1) roasting, and defluorinating; (2) cooling, and grinding; (3) pulping; (4) roasting at low temperature; (5) leaching, and separating; (6) removing impurities; (7) concentrating; (8) freezing; and (9) performing carbonization lithium precipitation to obtain the lithium carbonate product. The method for preparing lithium carbonate from lepidolite through a sulfuric acid roasting method is simple in process, low in sulfuric acid consumption, low in energy consumption and high in resource utilization rate, and causes less environment pollution.

Description

technical field [0001] The invention relates to a preparation method of lithium carbonate, in particular to a method for preparing lithium carbonate from lepidolite by a sulfuric acid roasting method. Background technique [0002] With the rapid development of low-carbon economy and green new energy industry, especially with the breakthrough and popularization and application of large-capacity power battery technology, the new lithium electric vehicle industry has risen rapidly. The demand has stepped out of the traditional limitations of "industrial monosodium glutamate" and ushered in a new era of "energy metals". [0003] Lithium carbonate is an important basic raw material for the development of lithium battery new energy industry. It is mainly used to synthesize various lithium battery cathode materials, and its market demand will show explosive growth. [0004] According to the difference of raw materials, the methods for producing lithium carbonate in industry are ma...

Claims

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Application Information

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IPC IPC(8): C01D15/08
Inventor 李良彬王彬陈超邓招男刘明傅利华彭爱平
Owner GANFENG LITHIUM CO LTD
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