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Device and method for continuously producing lithium hydroxide from salt lake lithium-rich brine

A technology of lithium hydroxide and brine, which is applied in the direction of lithium oxide;

Active Publication Date: 2021-06-08
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The main purpose of the present invention is to provide a device and method for continuously producing lithium hydroxide from salt lake lithium-rich brine, so as to solve the problem in the prior art that it is impossible to use salt lake lithium-rich brine to produce lithium hydroxide products in a continuous, large-scale and stable manner

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  • Device and method for continuously producing lithium hydroxide from salt lake lithium-rich brine

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Embodiment 1

[0092] A certain salt lake lithium extraction enterprise adopts the present invention figure 1 The device shown in the semi-industrial test, the raw material composition of lithium-rich brine is as follows:

[0093] element Li +

Mg 2+

Cl -

Na+ Concentration(g / L) 15～20 8 100 1.9

[0094] The above-mentioned lithium-rich brine is naturally settled and buffered and homogenized in the continuous buffer homogenization unit, and the buffered homogenized brine is subjected to continuous magnesium removal treatment in the continuous magnesium removal equipment. The lithium-rich brine after buffering and homogenization is continuously passed into three continuous magnesium precipitation tanks connected in sequence, and each magnesium precipitation tank is equipped with an atomization device for adding 30wt% sodium hydroxide aqueous solution to each magnesium precipitation tank. In the tank, continuous magnesium removal is carried out. During t...

Embodiment 2

[0100] A certain salt lake lithium extraction enterprise adopts the present invention figure 1 The device shown in the semi-industrial test, the raw material composition of lithium-rich brine is as follows:

[0101] element Li +

Mg 2+

Cl -

Na+ Concentration(g / L) 15～20 8 100 1.9

[0102] The above-mentioned lithium-rich brine is naturally settled and buffered and homogenized in the continuous buffer homogenization unit, and the buffered homogenized brine is subjected to continuous magnesium removal treatment in the continuous magnesium removal equipment. The lithium-rich brine after buffering and homogenization is continuously passed into three continuous magnesium precipitation tanks connected in sequence, and each magnesium precipitation tank is equipped with an atomization device for adding 30wt% sodium hydroxide aqueous solution to each magnesium precipitation tank. In the tank, continuous magnesium removal is carried out. During t...

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Abstract

The invention provides a device and a method for continuously producing lithium hydroxide from salt lake lithium-rich brine. The device comprises a continuous buffer homogenization unit, a continuous magnesium removal unit, a continuous lithium precipitation unit, a continuous causticization unit and a continuous evaporation crystallization unit. The device is used for continuously producing lithium hydroxide from salt lake lithium-rich brine, has the beneficial effects of continuous operation and large-scale production, and can obviously reduce the labor intensity, reduce the product difference caused by subjective distinguishing of manual control, improve the product quality stability, reduce the product cost and improve the product batch qualification. Meanwhile, the recovery rate of the lithium hydroxide is high, the process in the treatment process is simple, and the device is high in controllability and is very suitable for industrial large-scale application.

Description

technical field [0001] The invention relates to the technical field of lithium extraction from salt lake lithium-rich brine, in particular to a device and method for continuously producing lithium hydroxide from salt lake lithium-rich brine. Background technique [0002] Salt lake brine is one of the main raw materials for lithium extraction at present, accounting for 66% of the world's lithium resource reserves, and the other is granite pegmatite lithium deposits. Lithium-containing salt lakes in the world are divided into three types: carbonate type, sulfate type (sodium sulfate subtype, magnesium sulfate subtype) and chloride type, with extremely uneven distribution, mainly located in the South American Andes Plateau (Argentina, Bolivia, Chile), China's Qinghai-Tibet Plateau and North America's Nevada. [0003] Lithium-rich brine is the main process raw material for each salt lake lithium extraction enterprise. It connects the original brine, potash fertilizer production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02
CPCC01D15/02
Inventor 周文龙杨永亮徐长庆邱爽羡鹏飞杜国山汪德华唐建文桑园李少华
Owner CHINA ENFI ENGINEERING CORPORATION
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