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Method of extracting lithium salt from lepidolite

A lepidolite and lithium extraction technology, which is applied in the field of lithium salt extraction, can solve the problems of increasing the loss rate of rare metal materials, reducing the recycling rate of rare metals, and long heating time at high temperature, so as to reduce equipment damage and environmental impact Pollution, improving extraction utilization, and reducing energy consumption

Inactive Publication Date: 2015-01-28
李宇龙 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It takes at least 60 minutes to use the current calcination device and method at this temperature, which will cause the first one to maintain high temperature heating time for too long and the energy consumption to be too large; Dissolution and calcination increase the loss rate of rare metal materials in lepidolite raw materials and reduce the recovery rate of rare metals

Method used

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  • Method of extracting lithium salt from lepidolite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: The concentration involved in the embodiment is the mass concentration.

[0020] Get its main chemical composition of the lepidolite raw material that Yichun tantalum-niobium-lithium ore produces as follows table 1 (wt%) surplus is fluorine; Table 1 is:

[0021] Li 2 o

K 2 o

Na 2 o

Al 2 o 3

SiO 2

Fe 2 o 3

Rb 2 o

Cs 2 o

4.8

10.56

0.59

24.0

53.57

0.37

1.72

0.30

[0022] 1) Lepidolite with CaO and Ca(CH 3 COO) 2 Roasted at a high temperature by a plasma generator and defluorinated:

[0023] The above-mentioned lepidolite ore was crushed to 200 mesh, and mixed with CaO and Ca(CH 3 COO) 2 Lepidolite ore powder according to mass ratio: CaO: Ca(CH 3 COO) 2 =1:0.1:0.05 for mixed ball milling, mixed for 0.5h, and then placed in a plasma generator for heating and roasting, controlling the roasting temperature to 1500°C, and the roasting time was 30 minutes; at th...

Embodiment 2

[0031] 1) with the lepidolite ore powder described in example 1 and CaO and Ca(CH 3 COO) 2 Lepidolite ore powder according to mass ratio: CaO: Ca(CH 3 COO) 2 =1:0.4:0.01 Mixing ball milling, mixing for 2 hours, and then heating and roasting in a plasma generator, controlling the roasting temperature to 2000°C, and roasting time for 10 minutes, to obtain roasted material; after that, grind the roasted material to obtain roasted powder material;

[0032] The roasting powder and the mass concentration are 15% dilute sulfuric acid solution and (NH 4 ) 2 SO 4 Mix according to the mass ratio of 1:4:0.05, and heat up to 100°C, pressurize and control the reaction pressure at 2.5 atmospheres, stir to make it fully react, control the reaction time for 2 hours, and defluoride again Treatment (further removal of fluorine remaining in the lepidolite raw material) to form a solid-liquid mixed solution containing sulfate;

[0033] Filtrate and separate the solid-liquid mixed solution,...

Embodiment 3

[0038] 1) with the lepidolite ore powder described in example 1 and CaO and Ca(CH 3 COO) 2 Lepidolite ore powder according to mass ratio: CaO: Ca(CH 3 COO) 2 =1:0.3:0.03 Mixing ball milling, mixing for 1 hour, then heating and roasting in a plasma generator, controlling the roasting temperature to 1800°C, and roasting time for 20 minutes, to obtain roasted material; after that, grind the roasted material to obtain roasted powder material;

[0039] The roasting powder and the mass concentration are 25% dilute sulfuric acid solution and (NH 4 ) 2 SO 4 Mix according to the mass ratio of 1:3:0.15, and heat up to 90°C, pressurize and control the reaction pressure at 2 atmospheres, stir to make it fully react, control the reaction time for 3 hours, and perform defluorination again Treatment (further removal of fluorine remaining in the lepidolite raw material) to form a solid-liquid mixed solution containing sulfate;

[0040] Filtrate and separate the solid-liquid mixed solut...

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Abstract

The invention discloses a method of extracting a lithium salt from lepidolite. The method comprises the following steps: roasting lepidolite mineral aggregates with CaO and Ca(CH3COO)2 in a plasma generator after ball-milling and mixing; reacting roasted materials with a dilute sulfuric acid solution and (NH4)2SO4 under a pressurized state, controlling an acid leaching temperature to 85-100 DEG C to obtain a solid-liquid mixture, cooling and freezing the solid-liquid mixture to separate potassium, rubidium, cesium and alum, filtering, adding alkali and removing impurities and depositing lithium to prepare the lithium salt. The method disclosed by the invention is capable of completely removing fluorine in the raw materials, reducing the equipment damages and environmental pollution caused by fluorine gas generation in a raw material roasting stage, improving the extraction and utilization efficiency of rare metal raw materials in the lepidolite raw material, lowering the energy consumption, shortening the reaction time and reducing the consumption of acid-base raw materials. The method disclosed by the invention is mild in condition, stable in operation process, short in production period, high in equipment efficiency, capable of realizing comprehensive utilization of resources, low in production cost and beneficial to realizing industrial production of extracting the lithium salt from the lepidolite.

Description

technical field [0001] The invention relates to a method for extracting lithium salts, in particular to a method for extracting lithium salts from lepidolite. Background technique [0002] Lepidolite is an important mineral resource, which is rich in rare metal materials, such as lithium, sodium, potassium, rubidium, cesium, aluminum, etc. As the world's energy becomes increasingly tense, the development and utilization of new energy is a common issue in the world. Lithium battery new energy, as one of the important industries for the development of new energy, has been paid more and more attention by various countries; lithium and its salts lithium carbonate, lithium sulfate, etc. Salt is the basic raw material product of the lithium battery new energy industry, and lepidolite contains lithium metal, the basic material of the lithium battery new energy industry, so the development and application of lepidolite has become a hot topic today. [0003] The current methods for ...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B3/08C22B1/02C22B3/44
CPCY02P10/20
Inventor 李宇龙胡春晖
Owner 李宇龙
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