High temperature lepidolite hydrothermal treatment method for producing lithium hydroxide

A technology of lithium hydroxide and lepidolite, which is applied in the direction of lithium oxide; Easy to operate, simple process effect

Active Publication Date: 2018-06-15
江西云威新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of its high energy consumption, large material flow rate, low extraction rate of alkali metals such as Li, valuable metals such as rubidium and cesium cannot be fully utilized
The pressure cooking method is to react lepidolite and calcium hydroxide in liquid phase under high pressure and high temperature conditions, and then prepare crude lithium hydroxide. Due to its high reaction temperature and pressure and harsh reaction conditions, it is difficult to be widely used in industrial production. And the recovery rate of valuable metal elements is low
[0006] In view of the complex composition of lepidolite ore and high fluorine content, high-temperature roasting produces hourly F gas, which is not easy to recycle and control, and the lithium content is lower than spodumene, and the content of soluble impurities is high.
There is an urgent need for a simple, efficient, and industrialized production of lithium hydroxide, which can effectively solve the problems of material melting during high-temperature roasting, soluble impurities are easy to form insoluble double salts with lithium, and low-concentration lithium precipitation rate is low.

Method used

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  • High temperature lepidolite hydrothermal treatment method for producing lithium hydroxide
  • High temperature lepidolite hydrothermal treatment method for producing lithium hydroxide
  • High temperature lepidolite hydrothermal treatment method for producing lithium hydroxide

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The lepidolite concentrate is ball milled to an average particle size of 45 μm or less, the slurry overflows into the mixing tank, then granular calcium oxide is added, stirred rapidly, and then transported to the preheated reaction kettle after completion. The ring pipe extends to the reaction kettle, and is directly heated by the exhaust gas of the spray tower, and the temperature is controlled at 100 degrees Celsius for 4 hours. After the preheating reaction, the material is transported to the spray tower by a high-pressure pump, and instantaneous high-temperature water heat occurs at 450 degrees Celsius for 90 seconds. Reaction, after the completion of the hydrothermal reaction, the moisture content of the material is controlled to 20%. Reaction clinker, evaporative concentrated condensate and desalination mother liquor are mixed and leached, and the p-hour value of leaching is accurately controlled to 10 to realize simultaneous leaching and impurity removal. The lea...

Embodiment 2

[0038] The lepidolite concentrate is ball milled to an average particle size of 45 μm or less, the slurry overflows into the mixing tank, then granular calcium oxide is added, stirred rapidly, and then transported to the preheated reaction kettle after completion. The loop pipe extends to the reaction kettle, and is directly heated by the tail gas of the spray tower, and the temperature is controlled at 95 degrees Celsius for 6 hours. After the preheating reaction, the material is transported to the spray tower by a high-pressure pump, and instantaneous high-temperature water heat occurs at 420 degrees Celsius for 80 seconds. Reaction, after the completion of the hydrothermal reaction, the moisture content of the material is controlled to 20%. Reaction clinker, evaporative concentrated condensed water and desalted mother liquor are mixed and leached, and the leaching pH value is precisely controlled to 10 to realize simultaneous leaching and impurity removal. The leaching liqui...

Embodiment 3

[0043]The lepidolite concentrate is ball milled to an average particle size of 45 μm or less, the slurry overflows into the mixing tank, then granular calcium oxide is added, stirred rapidly, and then transported to the preheated reaction kettle after completion. The loop pipe extends to the reaction kettle, and is directly heated by the tail gas of the spray tower. The temperature is controlled at 90 degrees Celsius for 8 hours. After the preheating reaction, the material is transported to the spray tower by a high-pressure pump, and instantaneous high-temperature water heat occurs at 400 degrees Celsius for 90 seconds. Reaction, after the completion of the hydrothermal reaction, the moisture content of the material is controlled to 20%. Reaction clinker, evaporative concentrated condensed water and desalination mother liquor are mixed and leached, and the leaching pH value is precisely controlled to 10 to realize simultaneous leaching and impurity removal. The leaching liquid...

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Abstract

The invention discloses a high temperature lepidolite hydrothermal treatment method for producing lithium hydroxide. The method comprises following steps: step one, carrying out mechanical activation;step two, preparing raw materials; step three, carrying out preheating reactions; step four, performing hydrothermal reaction; step five, carrying out leaching and concentration; step six, removing salt: cooling concentrate at a temperature of 20 to 30 DEG C, and stirring the concentrate for 60 to 90 minutes to carry out crystallization to obtain a coarse product of lithium hydroxide. The methodhas the advantages of low energy consumption, cleanness, environmental friendliness, low cost, and high leaching efficiency, and is a novel method for fixing fluorine of lepidolite and leaching valuable metals. High temperature hydrothermal reactions are adopted to improve the burning performance of materials, and the problems that lepidolite is hard to melt at a high temperature and HF gas is generated during the melting process are solved. Moreover, the lithium conversion rate is largely improved at a proper temperature during a proper period, the technology is simpler, the material flux issmall during the production process, the recovery rate of lithium and alkali metals is high, and valuable metals are fully utilized.

Description

technical field [0001] The invention relates to the field of mineral raw material processing, in particular to a method for producing lithium hydroxide by high-temperature hydrothermal treatment of lepidolite. Background technique [0002] Lithium is widely used in industries such as batteries, ceramics, glass, lubricants, and optoelectronics. Among them, lithium carbonate and lithium hydroxide are two important lithium salts, and other lithium salt products are basically their downstream products. [0003] At present, there are many lithium-containing minerals, and the main ones with industrial value are spodumene, lepidolite, lithium feldspar, phosphorus lepidolite and iron lepidolite. At the same time, salt lake brine is an important source of lithium extraction. Lithium extraction from ore has been favored by some manufacturers and gradually started production, making the process of extracting lithium from ore gradually mature. [0004] Lepidolite ore contains Li, Na, K...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02
Inventor 李建球王春虎
Owner 江西云威新材料有限公司
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