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Method for extracting lithium by processing lepidolite through alkali dissolution process

A technology of lepidolite and lepidolite powder, applied in the direction of improving process efficiency, etc., can solve the problems of large pollution, large energy consumption, and loss of money, and achieve the effect of reducing costs

Inactive Publication Date: 2012-02-01
INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Considering the traditional and above-mentioned production process for extracting lithium salts, the production equipment is extremely easy to corrode, (roasting required) consumes a lot of energy, and the production process is very polluting; according to the current raw material and product prices, the cost of producing lithium salts with lepidolite is much higher than The cost of producing lithium salt from brine and spodumene, and it is at a loss

Method used

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  • Method for extracting lithium by processing lepidolite through alkali dissolution process
  • Method for extracting lithium by processing lepidolite through alkali dissolution process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Put lepidolite powder crushed to 700 meshes and 50% (wt%) strong alkali solution into the pressure-resistant reactor at a weight ratio of lepidolite powder: strong alkali solution = 1: 8, start stirring, and React at 250°C and 10 atmospheres for 8 hours, cool and filter. The filtered solids are returned to the reactor, and the reaction is continued next time.

[0021] (2) The reaction solution is diluted with water to a concentration of 2% (wt%), and the diluted material is ion-exchanged with a weakly acidic cation exchange resin to obtain cations in the system. The remaining alumina-silica sol is passed through a weakly basic anion exchange resin to remove fluoride ions in the solution, and then a small amount of sodium hydroxide is added as a stabilizer to adjust the pH to 8. After crystallization and concentration, the finished alumina-silica sol is sold directly.

[0022] (3) The ion-exchange resin that has adsorbed cations is first washed with water, then rins...

Embodiment 2

[0027] (1) Put lepidolite powder crushed to 100 meshes and 25% (wt%) strong alkali solution into the pressure-resistant reactor at a weight ratio of lepidolite powder: strong alkali solution = 1: 3, start stirring, and React at 100°C and 6 atmospheres for 2 hours, cool and filter. The filtered solids are returned to the reactor, and the reaction is continued next time.

[0028] (2) The reaction solution is diluted with water to a concentration of 5% (wt%), and the diluted material is ion-exchanged with a weakly acidic cation exchange resin to obtain cations in the system. The remaining alumina-silica sol is passed through a weakly basic anion exchange resin to remove fluoride ions in the solution, and then a small amount of sodium hydroxide is added as a stabilizer to adjust the pH to 8. After crystallization and concentration, the finished alumina-silica sol is sold directly.

[0029] (3) The ion-exchange resin that has adsorbed cations is first washed with water, then rinse...

Embodiment 3

[0034] (1) Put lepidolite powder crushed to 200 meshes and 35% (wt%) strong alkali solution into the pressure-resistant reactor according to the ratio of lepidolite powder: strong alkali solution = 1: 6 by weight, and start stirring. React at 190°C and 8 atmospheres for 6 hours, cool and filter. The filtered solids are returned to the reactor, and the reaction is continued next time.

[0035] (2) The reaction solution is diluted with water to a concentration of 10% (wt%), and the diluted material is ion-exchanged with a strongly acidic cation exchange resin to obtain cations in the system. The remaining alumina-silica sol is passed through a weakly basic anion exchange resin to remove fluoride ions in the solution, and then a small amount of sodium hydroxide is added as a stabilizer to adjust the pH to 8. After crystallization and concentration, the finished alumina-silica sol is sold directly.

[0036] (3) The ion exchange resin that has adsorbed cations is first washed with...

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Abstract

The invention discloses a method for extracting lithium by processing lepidolite through an alkali dissolution process, which comprises the following steps of: enabling the lepidolite to react with alkali in a liquid environment so as to enable the lithium, sodium, potassium, rubidium and cesium in the lepidolite to enter a solution, diluting lepidolite powder after alkali dissolution, and further performing ion exchange to acquire cations in a system. By adopting the method, 100% of the lithium in the lepidolite can enter the solution, reaction filter slag of the lepidolite returns to the alkali dissolution process step, and the complete alkali dissolution is realized. As sodium ions, potassium ions, lithium ions, cesium ions and rubidium ions in the lepidolite are obtained through ion exchange, and the interference of silicon, aluminum, fluorine and other elements in the system is removed, the lithium ions, the cesium ions and the rubidium ions in the lepidolite are easier to be extracted. According to the method, as the reaction is performed in the alkaline liquid environment, the fluorine in the lepidolite can not generate highly-corrosive hydrofluoric acid capable of corroding equipment. A byproduct generated by the method is aluminum silicon sol with a wide range of applications, and the direct selling of the aluminum silicon sol can greatly lower the cost of lithium extraction reaction.

Description

technical field [0001] The invention relates to a method for extracting lithium by treating lepidolite by an alkali-dissolving method, in particular to a method for extracting lithium by treating lepidolite by an alkali-dissolution method. Background technique [0002] Throughout the country and abroad, there are about a dozen methods of producing lithium salts using lepidolite as raw materials, but these methods basically melt or sinter the enriched ore with various alkalis, salts or their mixtures, and then use different methods to The sintered material is further processed to produce lithium salt. To sum up, there are roughly the following: [0003] 1) Potassium sulfate method: according to a certain proportion, lepidolite and potassium sulfate are sintered together at high temperature, at this time, the lithium in the mineral is replaced by potassium, and the reaction results in lithium being transformed into water-soluble lithium sulfate. The aluminum, silicon and oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/12C22B3/42C22B26/12
CPCY02P10/20
Inventor 王丁程斌刘昕昕季清荣
Owner INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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