Method for recovering rubidium, caesium, aluminum and potassium from mixed alum by-produced during extraction of lithium from lithionite

A by-product, lepidolite technology, which is applied in the field of recycling rare metals, achieves the effects of high comprehensive utilization rate, reduced production cost, and reduced production cost

Active Publication Date: 2018-12-14
江西海汇龙洲锂业有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The production of traditional rubidium and cesium salts mostly adopts the method of organic solvent extraction, and there are few reports on the production of rubidium and cesium salts by recrystallization

Method used

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  • Method for recovering rubidium, caesium, aluminum and potassium from mixed alum by-produced during extraction of lithium from lithionite
  • Method for recovering rubidium, caesium, aluminum and potassium from mixed alum by-produced during extraction of lithium from lithionite
  • Method for recovering rubidium, caesium, aluminum and potassium from mixed alum by-produced during extraction of lithium from lithionite

Examples

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Embodiment 1

[0022] Embodiment 1: The concentration involved in the embodiment is the mass concentration.

[0023] Get 2.5 tons of mixed alum as a by-product of lepidolite extraction of lithium, and the mixed alum is a mixture containing potassium alum, rubidium alum, and cesium alum; according to the mass ratio of mixed alum and water, add water to 25 cubic meters of In the slurry mixing tank, add the additive CaO, react at a reaction temperature of 70°C for 60 minutes, and the pH of the reaction end point is 6; perform liquid-solid separation to obtain solid slag containing aluminum hydroxide and calcium sulfate and rubidium, cesium, and potassium. Sulfate solution; the obtained solid slag of aluminum hydroxide and calcium sulfate and 30% sulfuric acid are reacted at 70°C for 80 minutes at a mass ratio of 1:2, and the pH at the end of the reaction is 2.5; liquid-solid separation is carried out to obtain Aluminum sulfate solution; the aluminum sulfate solution is evaporated and concentrat...

Embodiment 2

[0025] The technical methods in the following examples are all the same as in Example 1 except for the following descriptions.

[0026] Take 3.0 tons of mixed alum as a by-product of lepidolite extraction of lithium, add water in a 25 cubic slurry tank according to the mass ratio of mixed alum and water of 1:7, and add additive CaO, and react at a reaction temperature of 80°C 90min; Reaction end point pH=8; Carry out liquid-solid separation, obtain the solid slag containing aluminum hydroxide and calcium sulfate and the sulfate solution containing rubidium, cesium, potassium; % sulfuric acid, according to the mass ratio of 1:3.5, reacted at 80°C for 80 minutes, and the pH of the reaction end point was 1.5; carried out liquid-solid separation to obtain aluminum sulfate solution; evaporated and concentrated the aluminum sulfate solution to Al 2 o 3 After the concentration is 190g / L, carry out cooling crystallization, and the crystallization temperature is controlled at 35±2°C. ...

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Abstract

The invention discloses a method for recovering rubidium, cesium, aluminum and potassium from mixed alum by-produced during extraction of lithium from lithionite. According to the invention, the byproduct, i.e., the mixed alum, obtained after the extraction of lithium from lithionite is used as a raw material, and a plurality of products like rubidium sulfate and cesium sulfate are separately extracted. The method comprises the following steps: 1) a hybrid reaction; 2) preparation of aluminum sulfate crystals; and 3) refining of rubidium sulfate and cesium sulfate crystals. The operation of the method is safe and easily practicable. Compared with traditional methods normally using organic solvent extraction for production of rubidium and cesium salts, the method provided by the invention has the following advantages: the comprehensive utilization rate of lithionite is increased, the production cost of lithium salt extraction is lowered, harm to environment during lithium extraction isreduced; and equipment investment is lowered.

Description

Technical field: [0001] The invention relates to a method for recovering rare metals by using the by-products of lithium extraction from lepidolite, a mineral raw material, in particular to a method for recovering rubidium, cesium, aluminum and potassium from mixed alum as by-products of lithium extraction 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/74C01D5/00C01D17/00
CPCC01D5/008C01D17/003C01F7/745C01P2006/80
Inventor 旷戈尚亚伟陈善军杨云龙乐清斌张嗣和
Owner 江西海汇龙洲锂业有限公司
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