Lithium carbonate preparation method

A lithium carbonate and lithium bicarbonate technology, applied in lithium carbonate;/acid carbonate and other directions, can solve the problems of inability to prepare lithium carbonate, low extraction efficiency and high production cost, and achieve abundant raw materials and high extraction rate. , to avoid the effect of acid corrosion

Pending Publication Date: 2019-09-17
ZHEJIANG XINHUA CHEM
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Problems solved by technology

[0005] The embodiment of the present invention provides a preparation method of lithium carbonate, which aims to solve the existing problems such as low extraction efficiency, inability to directly extract lithium ions in alkaline brine or aqueous solution to prepare lithium carbonate, and severe equipment corrosion. , high production costs and environmental pollution

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preparation example Construction

[0012] Examples of the present invention provide a lithium carbonate preparation method. This method uses small water -soluble, low toxicity, low price, and an extraction organic phase with a high extraction rate for lithium ion to form an alkaline extraction system with lithium solution. The extraction rate of lithium ions in lithium -containing solutions can avoid acid corrosion of production equipment; at the same time, one or its arbitrary combination of carbon dioxide into pure water, alkaline metal salt or ammonium saline solution is used to obtain The water solution as an anti -extraction solution, the acidity of the anti -extraction system formed by the organic phase of the lithium -containing organic phase is less than 6 ~ 9mol / L, and can directly convert the lithium ion in the lithium -containing organic phase in an alkaline environment to , Heat the lithium bicarbonate solution collected by lithium ions, which can make lithium bicarbonate crystals in lithium bicarbonate...

Embodiment 1

[0037] Examples of the present invention provide a method of preparing lithium carbonate, including the following steps:

[0038] The lithium -containing solution is selected to contain 0.26g / L salt lake brine, and its pH value is 9.

[0039] Extractive stage: separate extraction agents (10ml of benzolrazone, 10ml of triangular oxidation), 20ml of triangular oxidation, and diluent (ordinary kerosene) mixed in the division of liquid funnel, and then add 390ml of salt brine, the control temperature is in the control temperature in At 5 ° C, the water phase and lithium -containing organic phase are separated after the oscillation L in minutes. Repeat the above extraction operation three times.

[0040] Anti -extraction phase: The anti -extraction solution uses carbon dioxide and 2%sodium bicarbonate aquatic solution with carbon dioxide and mass concentration. The above extraction phase is separated from the iconic organic phase and brine mixed with a brine of 390ml, and then the pres...

Embodiment 2

[0044] Examples of the present invention provide a method of preparing lithium carbonate, including the following steps:

[0045] The lithium -containing solution is concentrated in salt lake containing 2.2g / L, and its pH value is 11.

[0046] Extractive stage: separate extraction agents (5ml of phenyl dexilide, 5ml oxygen oxidation) 10ml, diluent (ordinary kerosene) 650ml mixed in the division of functions, and then add salt lake concentrated brine for 2000ml. The control temperature is in the control temperature. 25 ° C. After oscillation L0 minutes, the water phase and lithium -containing organic phase are separated, and the above extraction operations are repeated three times.

[0047] Anti -extraction phase: The anti -extraction solution uses carbon dioxide and 2%potassium carbonate aquatic solution with carbon dioxide and mass concentration. The lithium organic phase obtained by the above extraction phase is separated from the 2000ml anti -extract, and then the pressure is 0...

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Abstract

The invention belongs to the field of chemical industry, and provides a lithium carbonate preparation method, which comprises: mixing an extraction organic phase and a lithium-containing solution according to a volume ratio of 1:1-10 to form an alkaline extraction system, and extracting 1-3 times to obtain a lithium-containing organic phase, wherein the single extraction time is 1-15 min; mixing the lithium-containing organic phase and a back extraction solution according to a volume ratio of 1:1-10, carrying out back extraction 1-3 times, and collecting a lithium ion-containing lithium hydrogen carbonate aqueous solution, wherein the single back extraction time is 1-15 min, and the back extraction solution is an aqueous solution prepared by introducing carbon dioxide into a combination comprising one or any materials selected from pure water, an alkali metal salt and an ammonium salt aqueous solution; and heating the lithium ion-containing lithium hydrogen carbonate aqueous solution to crystallize and precipitate the lithium hydrogen carbonate in the aqueous solution, and thermally decomposing to obtain lithium carbonate. According to the present invention, the method has high extraction efficiency, can directly extract lithium ions from alkaline brine or aqueous solutions to prepare lithium carbonate, and further has advantages of low corrosion on production equipment, low production cost and environmental protection.

Description

Technical field [0001] The present invention is a chemical industry, and especially involves a method of preparation of lithium carbonate. Background technique [0002] Lithium is an important rarity element to promote the development of related industries such as modernization and technology. It is one of the most potential for development potential. Pharmaceuticals, welding, explosives, cement, smelting and new energy and many other fields are known as "energy metal of the 21st century". Especially in the field of new energy, the energy released by the Like lithium through the thermal nuclear reaction is equivalent to the energy generated by more than 20,000 tons of high -quality coal combustion. Its unique performance in atomic energy industry is also called "high -energy metal". From the perspective of economic development and national security, many countries have considered lithium as strategic reserves and carried out widespread technical research. [0003] my country is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
CPCC01D15/08
Inventor 林博策阿锡他林博正林文华
Owner ZHEJIANG XINHUA CHEM
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