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Novel environment-friendly process for producing lithium hydroxide monohydrate

A technology of lithium hydroxide monohydrate and lithium hydroxide, which is applied in the direction of lithium oxide;/hydroxide, inorganic chemistry, alkali metal compounds, etc., can solve the problems that the mixing effect needs to be improved, and the movement mode is single, so as to reduce dust The risk of emission, the effect of improving the uniformity and reducing the blind area of ​​work

Pending Publication Date: 2021-04-09
CENT SOUTH UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the existing humidifying mixer solves the problem of humidifying and stirring the powder to a certain extent, but its movement mode is single, there is a certain working blind area, and the mixing effect still needs to be improved

Method used

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  • Novel environment-friendly process for producing lithium hydroxide monohydrate
  • Novel environment-friendly process for producing lithium hydroxide monohydrate
  • Novel environment-friendly process for producing lithium hydroxide monohydrate

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Embodiment Construction

[0055] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0056] Such as figure 1 and figure 2 Shown, a kind of novel environment-friendly type produces the technique of lithium hydroxide monohydrate, comprises the following steps:

[0057] S1. Transform the spodumene through calcination. The calcination temperature is 950-1200°C. The smoke generated during the calcination process passes through the tail gas treatment system, and the dust is recycled to the twin-axis humidifying mixer for humidification treatment, and then calcined again;

[0058] S2. After cooling, fine grinding, acid reaction, and cooling in sequence, the product to be reacted with acid is cooled to ≤90°C and then made into a slurry with water, and the solid content of the slurry is 10% to 70%;

[0059] S3. Add calcium carbonate slurry to the slurry obtained in...

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Abstract

The invention relates to the technical field of lithium hydroxide production, in particular to a novel environment-friendly process for producing lithium hydroxide monohydrate, which comprises the following steps: sequentially calcining spodumene in a rotary kiln at high temperature, recovering dust generated in the calcining process to a double-shaft humidifying stirrer through a tail gas treatment system for humidifying treatment, and calcining again to obtain the lithium hydroxide monohydrate; cooling the material in a cooling kiln, ball-milling in a ball mill, roasting in an acidification kiln, cooling, size mixing, leaching, squeezing and separating in a filter press, freezing and separating sodium sulfate, evaporating, recrystallizing at low temperature, drying and the like. The special double-shaft humidifying stirrer is additionally arranged at the dust collecting position, dust is humidified, the risk of dust emission is reduced, and the environmental protection problem is effectively solved.

Description

technical field [0001] The invention relates to the technical field of lithium hydroxide production, in particular to a novel environment-friendly process for producing lithium hydroxide monohydrate. Background technique [0002] Lithium hydroxide is widely used in chemical raw materials, metallurgy, battery industry, 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 main method of producing lithium hydroxide monohydrate is to use spodumene as raw material, undergo high-temperature calcination transformation, cooling, ball milling, acidification roasting, cooling, pulping, leaching and pressing separation, freezing and separation of sodium sulfate, evaporation, low-temperature recrystallization, etc. It is obtained through process steps. This method requires spodumene to be calcined at a high tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02C01D5/00B01F7/22B01F11/00B01F15/00B01F15/02B01F27/91
CPCC01D15/02C01D5/00C01P2006/80B01F27/2312B01F27/2322B01F27/91B01F31/443B01F2035/351B01F35/184B01F35/7543
Inventor 汪梨超李荐何开茂何东利伍震洲许小林杨贤丽江莹黄剑新谭培渊
Owner CENT SOUTH UNIV
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