Method for producing lithium hydroxide by dissolving spodumene out of pipeline reactor

A pipeline reactor and lithium hydroxide technology, applied in the field of ore extraction of lithium, can solve the problems of complex steps of lithium hydroxide, low value of mirabilite, and large equipment investment, and achieve the effects of less material consumption, simple steps, and reduced equipment investment.

Inactive Publication Date: 2014-08-27
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods produce lithium hydroxide with complicated steps, large equipment investment, large consumption of raw materials, low value of by-product Glauber's salt, and high energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: The β-spodumene concentrate powder containing 5% lithium oxide obtained by converting the calcined crystal form, according to the weight ratio: β-spodumene powder: sodium hydroxide: lime: water = 1: 0.15: 0.1 : 2 Slurry, transported by pump to the metal pipeline connected front and back or the metal pipeline reactor with outer jacket steam jacket, the flow velocity of the reaction slurry in it is: 0.10 m / s, the reaction time is: 2.5 hours, the reaction pressure It is: 0.6 MPa, the reaction temperature range is: 90°C-180°C heating and elution; after the reaction, the slurry is heat-exchanged and cooled, the liquid-solid is separated and the filter residue is cleaned. The obtained filtrate is a solution containing lithium hydroxide, spodumene The dissolution rate of lithium in the medium reaches 91%; the lithium hydroxide monohydrate product is obtained through the steps of concentration, impurity removal, and crystallization of the obtained solution containing ...

Embodiment 2

[0025] Example 2: The β-spodumene concentrate powder containing 5.5% lithium oxide obtained by converting the calcined crystal form, according to the weight ratio: β-spodumene powder: sodium hydroxide: lime: water = 1: 0.3: 0.1 : 2.5 Slurry, transported by pump to the metal pipeline connected front and back or the metal pipeline reactor with outer jacket steam jacket, the flow velocity of the reaction slurry in it is: 0.30 m / s, the reaction time is: 4.5 hours, the reaction pressure It is: 0.2MPa, the temperature range of the reaction is: 90°C-130°C heating and elution; after the reaction, the slurry is cooled by heat exchange, the liquid is separated from the solid, and the filter residue is cleaned. The obtained filtrate is a solution containing lithium hydroxide, spodumene The dissolution rate of lithium in the medium reaches 92%; the lithium hydroxide monohydrate product is obtained through the steps of concentration, impurity removal, and crystallization of the obtained sol...

Embodiment 3

[0026] Example 3: The β-spodumene concentrate powder containing 5.5% lithium oxide obtained by converting the calcined crystal form, according to the weight ratio: β-spodumene powder: sodium hydroxide: lime: water = 1: 0.3: 0.1 : 2.5 Slurry, transported by pump to the metal pipeline connected front and back or the metal pipeline reactor with outer jacket steam jacket, the flow velocity of the reaction slurry in it is: 0.30 m / s, the reaction time is: 1.5 hours, the reaction pressure It is: 0.8MPa, and the temperature range of the reaction is: 120°C-220°C heating and elution; after the reaction, the slurry is heat-exchanged and cooled, the liquid-solid is separated and the filter residue is cleaned. The obtained filtrate is a solution containing lithium hydroxide, spodumene The dissolution rate of lithium in the medium reaches 96%; the lithium hydroxide monohydrate product is obtained through the steps of concentration, impurity removal and crystallization of the obtained solutio...

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Abstract

The invention provides a method for producing lithium hydroxide by dissolving spodumene out of a pipeline reactor. The method comprises the following steps: carrying out size mixing on water and beta spodumene powder, sodium hydroxide and lime which are obtained by transforming a calcined crystal, delivering into the pipeline reactor by using a pump, mixing by utilizing the flow of slurry in a pipeline, and reacting at a certain temperature and pressure; after the reacted slurry flows out of the pipeline reactor, carrying out solid-liquid separation; and carrying out concentration, impurity removal, crystallization and mother solution circulation on filter liquor to obtain a lithium hydroxide product. The method provided by the invention is simple in lithium hydroxide production process, small in investment, low in production energy consumption and high in lithium extraction rate without sodium sulphate frozen precipitation or sulfuric acid transformation.

Description

technical field [0001] The invention belongs to the technical field of extracting lithium from ores, and in particular relates to a method for producing lithium hydroxide by stripping spodumene pipeline reactors. Background technique [0002] Lithium and lithium salts have been expanded from traditional application fields such as glass ceramics, electrolytic aluminum, grease, refrigeration, etc. to high-tech fields such as aluminum-lithium alloys, lithium batteries, nuclear fusion, etc., especially the explosive potential of new energy for high-efficiency batteries. The increase in demand poses an urgent challenge to the technological progress of the lithium salt industry. Research on low-cost lithium mineral extraction technology is of great significance to the development of new energy sources in the world. [0003] At present, the production of lithium hydroxide mainly adopts the calcining reaction of β-spodumene and sulfuric acid. The reaction residue is leached to obtai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02
Inventor 旷戈孙加兴杨晶喜金冉胡松李欢尚亚伟陈光炉
Owner FUZHOU UNIV
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