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Process for producing lithium hydroxide by using lithium carbonate and lime milk

A technology of lithium hydroxide and lithium carbonate, which is applied in the direction of lithium oxide; And the effect of high yield and short process flow

Pending Publication Date: 2020-09-04
广西天源新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process is long, the investment in engineering and equipment is large, and the cost is high

Method used

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  • Process for producing lithium hydroxide by using lithium carbonate and lime milk

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Embodiment Construction

[0014] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0015] Such as figure 1 Shown, a kind of technology of the present invention produces lithium hydroxide with Quilonum Retard and milk of lime, comprises the following steps:

[0016] 1) Dissolve lithium carbonate into a slurry, and adjust calcium oxide into milk of lime with water. The solid content of the two is controlled at 10%~55%. Add the milk of lime into the slurry of lithium carbonate, and stir evenly to allow the two to react ;

[0017] 2) The material after the above reaction is sent to the filter press for filtration and backwashing to obtain calcium carbonate and lithium hydroxide clear liquid, and the concentration of lithium hydroxide is controlled by LiO 2 The equivalent meter is in the range of 10~75g / L, the water content of calcium carbonate is ≤18%, and it is sold as a compound product.

[0018] 3) After the above-mentioned lithiu...

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Abstract

The invention discloses a process for producing lithium hydroxide by using lithium carbonate and lime milk, which comprises the following steps: 1) dissolving lithium carbonate to prepare slurry, preparing calcium oxide into lime milk by using water, and uniformly stirring to react the lithium carbonate and the lime milk; 2) conveying the reacted material to a filter press for filtering and backwashing to obtain calcium carbonate and lithium hydroxide clear liquid; 3) filtering the lithium hydroxide clear liquid through a precision filter to remove calcium salt, and then feeding into low-temperature negative-pressure complete crystallization equipment for evaporation, concentration and purification; 4) centrifugally separating and drying the lithium hydroxide solution obtained in the step3) again to obtain a lithium hydroxide monohydrate product. The method is short in process, low in engineering and equipment investment, wide in raw material source, high in conversion rate and yieldand low in energy consumption.

Description

technical field [0001] The invention relates to the technical field of lithium hydroxide production, in particular to a process for producing lithium hydroxide with lithium carbonate and milk of lime. Background technique [0002] Lithium hydroxide is widely used in chemical raw materials, battery industry, metallurgy, ceramics, national defense, atomic energy, aerospace and other industries. In the battery industry, it is used as an additive for alkaline storage batteries, which can prolong its life and increase storage capacity. At present, the conventional production process of lithium hydroxide is to calcine and acidify spodumene, leaching with calcium carbonate, purifying with calcium oxide, causticizing with liquid caustic, filtering, and freezing the filtered clear liquid to separate sodium sulfate to obtain hydrogen. Lithium oxide solution is then evaporated, concentrated and dried to obtain lithium hydroxide. The technological process is long, the investment in eng...

Claims

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Application Information

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IPC IPC(8): C01D15/02
CPCC01D15/02
Inventor 伍震洲何东利何开茂汪梨超姚伟明欧展鸣蒋卓灿苏宙
Owner 广西天源新能源材料有限公司