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Lithium carbonate preparation method

A lithium carbonate and lithium sulfate technology, applied in lithium carbonate;/acid carbonate and other directions, can solve the problems of large energy waste, high temperature requirements, and difficult removal of impurities in the later stage, so as to reduce energy consumption and improve economic effect

Inactive Publication Date: 2018-05-11
余成辰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is exactly to provide a kind of preparation method of lithium carbonate aiming at the problem of high temperature requirement, large energy waste and difficult removal of impurities in the later stage in the process of preparing lithium carbonate by roasting method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A preparation method for lithium carbonate, comprising the steps of:

[0013] (1) Enrich the natural spodumene into a concentrate containing 3% lithium oxide through mineral processing, send it into the rotary furnace, and roast it at 600 ° C to convert the α-spodumene in the ore into β-lithium Pyroxene, stop heating and cool naturally;

[0014] (2) When the temperature of the spodumene drops to 80°C, crush it, sieve it, add excess concentrated sulfuric acid, mix it evenly, and send it to the converter for sulfated sintering, then leaching the sulfuric acid sintered block with water to make a water-soluble Lithium sulfate;

[0015] (3) Neutralize the excess sulfuric acid in the leaching liquid with calcium carbonate to a pH of 5.5, filter, remove calcium, magnesium, iron, and aluminum from the filtrate by chemical methods, and then use carbon black to decolorize, and concentrate the feed liquid before proceeding Filter to make saturated lithium sulfate solution;

[0...

Embodiment 2

[0018] A preparation method for lithium carbonate, comprising the steps of:

[0019] (1) Enrich the natural spodumene into a concentrate containing 5% lithium oxide through mineral processing, send it into a rotary furnace, and roast it at 800 ° C to convert α-spodumene in the ore into β-lithium Pyroxene, stop heating and cool naturally;

[0020] (2) When the temperature of the spodumene drops to 120°C, crush it, sieve it, add excess concentrated sulfuric acid, mix it evenly, and send it to the converter for sulfation sintering, then leaching the sulfuric acid sintered block with water to make water-soluble Lithium sulfate;

[0021] (3) Neutralize the excess sulfuric acid in the leaching liquid with calcium carbonate to a pH of 6.5, filter, remove calcium, magnesium, iron, and aluminum from the filtrate by chemical methods, and then use carbon black to decolorize, and concentrate the feed liquid before proceeding Filter to make saturated lithium sulfate solution;

[0022] (...

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Abstract

The invention discloses a lithium carbonate preparation method, which comprises: enriching natural spodumene into a concentrate, feeding into a rotary kiln, roasting to convert alpha-spodumene in theore into beta-spodumene, stopping the heating, and naturally cooling; crushing when the temperature of spodumene is reduced to 80-120 DEG C, screening, adding excess concentrated sulfuric acid, feeding into a converter, sintering, and leaching the sulfuric acid sintering block by using water to prepare water-soluble lithium sulfate; neutralizing the excess sulfuric acid to achieve the pH value of5.5-6.5, filtering, removing calcium, magnesium, iron and aluminum from the filtrate, carrying out decolorization, and concentrating the material liquid to prepare a saturated lithium sulfate solution; and adding a saturated sodium carbonate solution to the saturated lithium sulfate solution to generate lithium carbonate precipitate, separating the precipitate to obtain lithium carbonate with a product purity of more than 70%, repeatedly washing with hot water to obtain lithium carbonate with a purity of 96-97%, and drying to obtain the product. According to the present invention, the preparation method is simple, the energy consumption is greatly reduced, and the economic benefits of the enterprise are improved.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium compounds, in particular to a preparation method of lithium carbonate. Background technique [0002] Lithium carbonate is the raw material of lithium metal and various lithium compounds. It is mainly used in the preparation of various lithium chemicals and aluminum smelting industry. It is also used in heat-resistant glass, porous glass and tranquilizers. High-purity lithium carbonate is a magnetic material, optical instrument , Dielectric and other electronics industry necessities. [0003] At present, there are several methods for preparing lithium carbonate. One is to use liquid minerals, such as salt lake brine, mineral springs and well brine, the content of which is only a few per thousand. Generally, phosphate precipitation-ion exchange method or solvent extraction method is used. . Another is to use solid minerals, such as spodumene, which can contain up to 8% lithium oxide...

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 余成辰
Owner 余成辰
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