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Method for preparing lithium carbonate from lepidolite

A technology of lithium carbonate and lepidolite, which is applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems of low leaching rate of valuable metals, low utilization rate of raw materials, and restrictions on large-scale production, and achieve effective Conducive to large-scale production, energy saving, and the effect of improving recovery rate

Inactive Publication Date: 2016-11-23
深圳前海南锂新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional processes using lepidolite as raw materials mainly include salt pressure cooking, alkali pressure cooking and sulfuric acid method, but these processes will generate a large amount of waste residue in production (about 30-40 tons of waste residue per ton of lithium carbonate produced , the main components of these "waste residues" are a mixture of silica and alumina, a large amount of gypsum and a small amount of iron oxide, etc., the yield of lithium is low (about 60%), and the reaction conditions are harsh, and it is easy to cause severe corrosion of equipment and other defects. On the one hand, the production cost is greatly increased and the possibility of large-scale production is restricted; low added value
[0005] Therefore, due to the high cost of the existing lepidolite production process, the low comprehensive utilization rate, and serious equipment corrosion

Method used

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  • Method for preparing lithium carbonate from lepidolite
  • Method for preparing lithium carbonate from lepidolite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First mix lepidolite (100-500 mesh) and 98% concentrated sulfuric acid at a ratio of 1:1 with a mixer, and then dry it twice in a drying kiln (100-350°C and 200-500°C each 2-4 hours), during the drying process, the sulfuric acid and the metal ions in lepidolite fully react, not only replacing all the metal ions, but also consuming all the sulfuric acid, which improves the lithium leaching rate and reduces the pressure of subsequent neutralization. The dried material is clinker, and the dried clinker is crushed again into 100-500 mesh by a crusher, and then soaked and stirred in an enamel reaction tank with twice the amount of water and boiled for 30-60 minutes, lithium and other metal ions All dissolved in water into liquid phase. In the actual reaction, drying can be carried out more than two times according to the need, and the drying conditions are consistent with the above.

[0031] After water leaching, the mixed solution is separated from the solid and liquid thr...

Embodiment 2

[0036] First mix lepidolite (100-500 mesh) and 98% concentrated sulfuric acid at a ratio of 1:0.8 with a mixer, and then dry twice in a drying kiln (100-350°C and 200-500°C each 2-4 hours), during the drying process, the sulfuric acid and the metal ions in lepidolite fully react, not only replacing all the metal ions, but also consuming all the sulfuric acid, which improves the lithium leaching rate and reduces the pressure of subsequent neutralization. The dried material is clinker, and the dried clinker is crushed again into 100-500 mesh by a crusher, and then soaked and stirred in an enamel reaction tank with twice the amount of water and boiled for 30-60 minutes, lithium and other metal ions All dissolved in water into liquid phase. In the actual reaction, drying can be carried out more than two times according to the need, and the drying conditions are consistent with the above.

[0037] After water leaching, the mixed solution is separated from the solid and liquid thro...

Embodiment 3

[0043] First mix lepidolite (100-500 mesh) and 98% concentrated sulfuric acid at a ratio of 1:2 with a mixer, and then dry twice in a drying kiln (100-350°C and 200-500°C each 2-4 hours), during the drying process, all the metal ions are replaced, which improves the lithium leaching rate and reduces the pressure of subsequent neutralization. The dried material is clinker, and the dried clinker is crushed again into 100-500 mesh by a crusher, and then soaked and stirred in an enamel reaction tank with twice the amount of water and boiled for 30-60 minutes, lithium and other metal ions All dissolved in water into liquid phase. In the actual reaction, drying can be carried out more than two times according to the need, and the drying conditions are consistent with the above.

[0044] After water leaching, the mixed solution is separated from the solid and liquid through the centrifuge while it is still hot (≥90°C), and the solid residue is washed and dried by the centrifuge, and...

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Abstract

The method for preparing lithium carbonate from lepidolite comprises the following steps: take lepidolite (100-500 mesh), add 98% concentrated sulfuric acid in a mass ratio of 1: [0.8-3], stir, and dry step by step to obtain clinker , and crush the clinker into 100-500 mesh, add water to soak, stir, and boil to obtain a mixed solution; centrifuge the mixed solution while it is hot to obtain mother liquor A, cool the mother liquor A in a reaction vessel to 20-80°C, and crystallize Rubidium cesium alum is extracted, and then centrifuged to obtain mother liquor B; the mother liquor B is cooled to -30~20°C in the reaction vessel, potassium alum is crystallized, and then centrifuged to obtain mother liquor C; mother liquor C is neutralized with lye to the pH value After centrifugation, the mother liquor D is obtained, and then the mother liquor D is evaporated and concentrated, and then filtered to obtain the mother liquor E; the mother liquor E is mixed with potassium carbonate or sodium carbonate solution, heated to 80-100°C, and completed under stirring. That is, the crude product of lithium carbonate is prepared, and the crude product is centrifuged, washed and dried to obtain the finished battery grade lithium carbonate. The invention improves the leaching rate of lithium, saves raw materials, generates less slag, and lowers requirements on equipment.

Description

【Technical field】 [0001] The present invention relates to the preparation method of lithium carbonate, especially relate to the method for preparing lithium carbonate from lepidolite. 【Background technique】 [0002] Lepidolite, also known as "scale mica", is mainly composed of KLi 1.5 al 1.5 [AlSi 3 o 10 ](F,OH) 2 , containing Li 2 O is about 1.23-5.90%, and it also contains other rare metals such as rubidium and cesium; lepidolite is the most common lithium mineral and an important mineral for lithium extraction. Its comprehensive development and utilization has very important economic and strategic value. [0003] Lithium carbonate is an important chemical raw material. With the national new energy development plan, lithium battery new energy has become one of the national key support for the development of energy industries; and lithium carbonate is an important basic raw material for the development of lithium battery new energy. It is used in new energy materials. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
Inventor 邱学成
Owner 深圳前海南锂新材料有限公司
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