Circular acid leaching extraction process for lepidolite

An extraction process, lepidolite technology, applied in the direction of improving process efficiency, etc., can solve the problems of cumbersome operation steps, many external materials, and many by-products, and achieve the goal of improving ion exchange efficiency, improving leaching efficiency, and improving utilization rate Effect

Inactive Publication Date: 2012-08-29
张韵 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of high energy consumption, many external materials, many by-products, low comprehensive utilization rate, cumbersome operation steps, high equipment requirements, high production cost and poor extraction effect existing in the prior art. Pro...

Method used

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  • Circular acid leaching extraction process for lepidolite
  • Circular acid leaching extraction process for lepidolite
  • Circular acid leaching extraction process for lepidolite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Primary leaching process: first add lepidolite ore powder with a particle size of 150 mesh into the acid leaching solution under stirring, and the mass ratio of lepidolite ore powder and acid leaching solution is 1:5. The acid leaching solution contains 30% (mass percentage concentration, the same below) sulfuric acid, which is prepared from the crystallized residual acid solution of the previous round of acid leaching, sulfuric acid with a mass percentage concentration of 98% and the initial washing liquid of the releaching filter residue washing operation. become. Then stir the reaction under normal pressure for 4 hours to carry out the initial immersion reaction, the reaction temperature is 120°C, and the fluorine-containing gas generated during the reaction is exported and absorbed by water. After the reaction is finished, the reaction solution is filtered and separated to obtain primary leaching residue and primary leaching filtrate, and then the primary leaching f...

Embodiment 2

[0042] Primary leaching process: first add lepidolite ore powder with a particle size of 200 mesh into the acid leaching solution under stirring, the mass ratio of lepidolite ore powder and acid leaching solution is 1:4. The acid leaching solution contains 40% sulfuric acid, which is prepared from the crystallized residual acid solution of the previous round of acid leaching, sulfuric acid with a mass percentage concentration of 98% and the initial washing solution of the releaching filter residue water washing operation. Then stir the reaction under normal pressure for 3 hours to carry out the initial immersion reaction, the reaction temperature is 110°C, and the fluorine-containing gas generated during the reaction is exported and absorbed by water. After the reaction is finished, the reaction solution is filtered and separated to obtain primary leaching residue and primary leaching filtrate, and then the primary leaching filtrate is sequentially subjected to cooling crystall...

Embodiment 3

[0047] Primary leaching process: first add lepidolite ore powder with a particle size of 250 mesh into the acid leaching solution under stirring, the mass ratio of lepidolite ore powder and acid leaching solution is 1:3. The acid leaching solution contains 35% sulfuric acid, which is prepared from the crystallized remaining acid solution of the previous round of acid leaching, sulfuric acid with a mass percentage concentration of 98% and the initial washing solution of the releaching filter residue water washing operation. Then stir the reaction under normal pressure for 2 hours to carry out the initial immersion reaction, the reaction temperature is 100°C, and the fluorine-containing gas generated during the reaction is exported and absorbed by water. After the reaction, the reaction solution is filtered and separated to obtain the primary leaching residue and primary leaching filtrate, and then the primary leaching filtrate is sequentially subjected to cooling crystallization...

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Abstract

The invention relates to a circular acid leaching extraction process for lepidolite, which comprises the following steps of: firstly, adding lepidolite mineral powder to acid leaching liquid to react; then, performing filtering separation on reaction liquid to obtain preliminarily-leached filter residues and preliminarily-leached filtrate, cooling to crystallize the preliminarily-leached filtrate, and performing the filtering separation to obtain preliminarily-leached crystals and preliminarily-leached crystal spent acid liquid; adding the preliminarily-leached filter residues to the acid leaching liquid, and then, adding a fluosilicic acid solution to react; performing the filtering separation on the reaction liquid to obtain re-leached filter residues and re-leached filtrate; cooling to crystallize the re-leached filtrate, and performing the filtering separation to obtain re-leached crystals and re-leached crystal spent acid liquid; washing the re-leached filter residues, and drying to obtain silicon dioxide of which the purity exceeds 98 percent; mixing the preliminarily-leached crystals with the re-leached crystals, dissolving by water, performing recrystallization and filtering to remove mixed alum to obtain recrystallization mother liquid; and adding sodium hydroxide to the recrystallization mother liquid to regulate the pH value to be 7-10 so as to precipitate aluminum, filtering to remove aluminum hydroxide, adding sodium carbonate to the filtrate, and filtering to obtain lithium carbonate.

Description

technical field [0001] The invention relates to a decomposition method of lepidolite, in particular to a method for efficiently extracting lithium, potassium, aluminum, fluorine, rubidium, and cesium elements from lepidolite, and at the same time obtaining high value-added white carbon black, which is particularly suitable for improving lepidolite The extraction rate of lithium, potassium, aluminum, fluorine, rubidium, and cesium elements can be improved, thereby improving the purity of the acid leaching filter residue and obtaining high value-added white carbon black. Background technique [0002] Yichun, Jiangxi, my country contains a large amount of lepidolite mineral resources. Lepidolite is the tailings of tantalum and niobium mining, Li in lepidolite 2 O content up to 4.5%, K 2 O content is as high as 8.6%, and contains aluminum, fluorine and expensive rubidium, cesium and other elements. "The 21st century is the century of lithium". With the application of lithium ...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B3/08C22B26/12
CPCY02P10/20
Inventor 袁灿张韵凌玉峰熊伟
Owner 张韵
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