Method for leaching lithium from lepidolite

A lepidolite and leaching technology, which is applied in the field of lithium metallurgy, can solve the problems of unfavorable clean production environmental protection requirements, increase the cost of auxiliary materials, and environmental protection pressure, and achieve the effects of avoiding entrainment loss, improving purity, and reducing consumption

Inactive Publication Date: 2021-08-24
GUANGDONG JIANA ENERGY TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the conventional way to remove aluminum and iron is to use milk of lime for precipitation. Due to the large amount of slag and the strong adsorption of aluminum hydroxide, a lot of lithium will be taken away during the precipitation process, and a large amount of leaching slag and precipitation slag will be produced. environmental pressure
Chinese invention patent CN201010160302.7 provides a method for producing lithium carbonate by two-stage conversion of lithium ore. By adding reducing agents such as coal powder and coke powder, aluminum sulfate and iron sulfate are reduced and decomposed into metal oxides and sulfur dioxide to reduce the amount of leachate. However, when this method uses a carbonaceous reducing agent, it will produce a greenhouse gas-carbon dioxide, which is not conducive to the environmental protection requirements of clean production, and also increases the cost of auxiliary materials; the gas produced by its reduction and decomposition is sulfur dioxide, which must be It needs to be oxidized to sulfur trioxide before it can be recycled and returned to use, so another process is added

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  • Method for leaching lithium from lepidolite

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0040] 1. Mix 98% sulfuric acid and lepidolite powder evenly at a mass ratio of 1.2:1; roast at 100°C for 1.5 hours to obtain a roasted material.

[0041] 2. After the calcined material is crushed appropriately (just crush the agglomerates), it is calcined at 880° C. for 4 hours to obtain the calcined material. The gas produced in the process is absorbed with sulfuric acid, and after the mass percentage of sulfuric acid reaches 98%, return to step 1 for sulfation roasting for batching.

[0042] 3. According to the solid-to-liquid ratio of 1:2, leaching the calcined material with water for 4 hours at room temperature, and filtering to obtain the leaching solution and leaching residue.

[0043] The leaching solution and leaching slag were taken for measurement, and the results of the leaching solution measurement are as follows:

[0044] analysis element Li Fe Ca Mg Al pH Leachate 8.03 <0.001

[0045] Lithium content in leaching residue: 0.14%. The le...

example 2

[0047] 1. Mix 98% sulfuric acid and lepidolite powder evenly at a mass ratio of 0.75:1; roast at 150°C for 2.5 hours to obtain a roasted material.

[0048] 2. After the calcined material is properly crushed (just crush the agglomerate), it is calcined at 900° C. for 6 hours to obtain the calcined material. The gas produced in the process is absorbed with sulfuric acid, and after the mass percentage of sulfuric acid reaches 98%, return to step 1 for sulfation roasting for batching.

[0049] 3. According to the solid-to-liquid ratio of 1:3, add water to leaching the calcined material at room temperature for 2.5 hours, and filter to obtain leaching liquid and leaching residue.

[0050] The leaching solution and leaching slag were taken for measurement, and the results of the leaching solution measurement are as follows:

[0051] analysis element Li Fe Ca Mg Al pH Leachate 6.03 <0.001

[0052] Lithium content in leaching residue: 0.16%. The lithium le...

example 3

[0054] 1. Mix 98% sulfuric acid and lepidolite powder evenly at a mass ratio of 0.9:1; bake at 150°C for 2 hours.

[0055] 2. After the calcined material is crushed appropriately (just crush the agglomerate), calcined at 800° C. for 5 hours to obtain the calcined material. Gases generated during the process are absorbed with sulfuric acid. After the mass percent of sulfuric acid reaches 98%, return to the first step for sulfation roasting batching.

[0056] 3. According to the solid-to-liquid ratio of 1:4, add water to leaching the calcined material at room temperature for 2 hours, and filter to obtain leaching liquid and leaching residue.

[0057] The leaching solution and leaching slag were taken for measurement, and the results of the leaching solution measurement are as follows:

[0058] analysis element Li Fe Ca Mg Al pH Leachate 4.25 <0.001

[0059] Lithium content in leaching residue: 0.12%. The lithium leaching rate was calculated to be 9...

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Abstract

The invention discloses a method for leaching lithium from lepidolite. After the lepidolite is subjected to sulfuric acid roasting, a calcining decomposition process is added, so that metal sulfate formed by aluminum and iron impurities in the sulfuric acid roasting process is decomposed into metal oxides, and the metal oxides are not leached in the subsequent water leaching process. Compared with the prior art, the purity of the lithium-containing leachate is improved, the precipitation and impurity removal process is omitted, a large amount of precipitation slag generated in the precipitation and impurity removal process and entrainment loss caused by the precipitation slag are avoided, the direct recovery rate of lithium is improved, the product has higher market competitiveness, and the impurity aluminum is retained in the leaching slag in the form of aluminum oxide, leaching residues can be sold as bauxite through post-treatment, so that zero emission of discharged residues in the method can be basically achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium metallurgy, and in particular relates to a method for leaching lithium from lepidolite. Background technique [0002] With the rapid development of lithium batteries, the demand for lithium will also increase. In nature, lithium resources mainly exist in solid ore and liquid brine, such as Li in lepidolite concentrate. 2 The O content can reach about 4.5%, so it has very important practical significance for the development of lepidolite. The main component of lepidolite is 3SiO 2 AL 2 o 3 2[(Li,K)(F,OH)]. At present, the methods for extracting lithium from lepidolite mainly include sulfuric acid roasting and water leaching, sulfate roasting and water leaching, chlorination roasting and water leaching, limestone roasting and acid leaching, and pressure cooking. Among them, the sulfuric acid roasting water leaching method has become the mainstream leaching process because of its simple process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/06C22B1/00C22B3/04C22B26/12
CPCC22B1/06C22B1/00C22B26/12Y02P10/20
Inventor 钟晖文定强易陆郑江峰
Owner GUANGDONG JIANA ENERGY TECH CO LTD
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