Method for efficiently preparing lithium carbonate

A lithium carbonate, high-efficiency technology, applied in the direction of magnesium carbonate, lithium carbonate;/acid carbonate, etc., can solve the problems of not meeting the use requirements, and achieve the effect of meeting the use requirements and simple preparation process

Inactive Publication Date: 2018-11-27
江西金辉锂业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Salt lake brine is an important method for preparing lithium carbonate, but the comprehensive yield of lithium carbonate extracted from salt lake brine is only about 30%, which cannot meet the needs of people.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for efficiently preparing lithium carbonate, the specific steps are as follows:

[0022] Step 1, pre-filtering the carbonated salt lake brine to remove solid suspended matter, and then adjusting the pH value to 3.6 to obtain the first liquid;

[0023] Step 2, add magnesium chloride to the first liquid and mix and stir evenly at a rotating speed of 150rpm, separate solid and liquid, and the solid part is washed and dried to form a magnesium carbonate product, wherein the liquid part is evaporated and concentrated and kept in an electric field of 1.65KV for 39 Minutes to make the second liquid;

[0024] Step 3, add sodium hydroxide solution to the second liquid and stir to mix evenly, and separate solid and liquid to remove Mg 2+ , Fe 3+ 、Al 3+ , to obtain the third liquid;

[0025] Step 4, the third liquid, the aqueous dispersant and the loofah extract are fully stirred in the hydrothermal synthesis reaction kettle and then sealed, the loofah extract is brok...

Embodiment 2

[0029] A method for efficiently preparing lithium carbonate, the specific steps are as follows:

[0030] Step 1, pre-filtering the carbonated salt lake brine to remove solid suspended matter, and then adjusting the pH value to 4.4 to obtain the first liquid;

[0031] Step 2, adding magnesium chloride to the first liquid and mixing and stirring evenly, separating the solid and liquid, washing and drying the solid part to form a magnesium carbonate product, wherein the liquid part is evaporated and concentrated and kept in an electric field of 1.65KV for 44 minutes to produce the second Two liquids;

[0032] Step 3, add alkaline solution to the second liquid and stir to mix evenly, and separate solid and liquid to remove Mg 2+ , Fe 3+ 、Al 3+ , to obtain the third liquid;

[0033] Step 4: Treat the third liquid in a microwave with a power of 88W for 22 minutes, then fully stir it with an aqueous dispersant and a loofah extract in a hydrothermal synthesis reaction kettle, and ...

Embodiment 3

[0037] A method for efficiently preparing lithium carbonate, the specific steps are as follows:

[0038] Step 1, pre-filtering the carbonated salt lake brine to remove solid suspended matter, and then adjusting the pH value to 4.5 to obtain the first liquid;

[0039] Step 2: Add magnesium chloride to the first liquid and mix and stir evenly, separate the solid and liquid, wash and dry the solid part to form a magnesium carbonate product, wherein the liquid part is evaporated and concentrated and kept in an electric field of 1.72KV for 40 minutes to produce the second Two liquids;

[0040] Step 3, add potassium hydroxide solution to the second liquid and stir to mix evenly, and separate solid and liquid to remove Mg 2+ , Fe 3+ 、Al 3+ , to obtain the third liquid;

[0041] Step 4, treat the third liquid in a microwave with a power of 86W for 22 minutes, then fully stir it with cationic polyacrylamide and loofah extract in a hydrothermal synthesis reaction kettle, and then se...

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PUM

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Abstract

The invention discloses a method for efficiently preparing lithium carbonate. The method specifically comprises the following steps: 1, performing filtering pretreatment on carbonic acid type salt lake brine, and regulating the pH value to be 3.4-4.8 so as to obtain first liquid; 2, adding magnesium chloride into the first liquid, uniformly mixing and stirring, performing solid-liquid separation,evaporating and concentrating the liquid part, and treating in an electric field so as to prepare second liquid; 3, adding an alkaline solution into the second liquid, uniformly mixing and stirring, and performing solid-liquid separation to obtain third liquid; 4, fully stirring the third liquid, an aqueous dispersant and loofah extract in a hydrothermal synthesis reactor, sealing the reactor, heating the reactor and reacting, and filtering the slurry in the reactor so as to obtain a lithium carbonate filter cake; and 5, washing the lithium carbonate filter cake with deionized water, and drying, thereby obtaining the finished product. According to the method disclosed by the invention, different interfering ions are removed by different steps, and the purity and yield of the obtained lithium carbonate are better than those of the conventional method.

Description

technical field [0001] The invention relates to the field of lithium carbonate preparation, in particular to a method for efficiently preparing lithium carbonate. Background technique [0002] Lithium carbonate is the raw material for preparing various lithium compounds. It is the product with the largest output and the widest application among lithium salt products. It is widely used in chemical industry, metallurgy, ceramics, medicine, refrigeration and other industries, and can also be used to prepare catalysts for chemical reactions. Known as "industrial monosodium glutamate". 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 gone out of the traditional limitations of "industrial monosodium glutamate" and ushered in a new era of "energy metals". Lithium ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08C01F5/24
CPCC01D15/08C01F5/24C01P2006/80
Inventor 李辉照曾位勇南进喜穆健书吴进方
Owner 江西金辉锂业有限公司
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