Method for directly producing environment-friendly lithium hydroxide monohydrate from spodumene

A spodumene, environmentally friendly technology, applied in the direction of lithium oxide; / hydroxide, etc., can solve problems such as damage, and achieve the effect of good fluidity and crystal enlargement

Active Publication Date: 2012-12-26
SICHUAN GUORUN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above technical problems, the present invention proposes a method that can block the dust source and the irritating smell of

Method used

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  • Method for directly producing environment-friendly lithium hydroxide monohydrate from spodumene

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1:

[0034] The 200 mesh spodumene powder is calcined under high temperature conditions for 30 minutes, among which: Li in the spodumene 2 The content of O is greater than 5%; the roasted spodumene is ball milled to a particle size greater than 200 mesh by a ball mill; the concentrated sulfuric acid with a concentration of 98% is mixed with the ball-milled spodumene powder uniformly, and the reaction temperature is controlled at 250°C ; Make a slurry of acidified ore and water, add double fly powder and adjust the pH to 5.5, then add quicklime or lime slurry to adjust the pH to 13.5, then stir and react for 20 minutes; separate the liquid and slag in the disc filter, The slag is washed with water for 1-6 times and drained to make bricks. First, NaOH is added to the liquid separated in step (5) and the mother liquor separated in step (9) is stirred evenly; sent to the freezing tank to cool to 0 degrees for precipitation Sodium sulfate crystals, separated by a separa...

Example Embodiment

[0036] Example 2:

[0037] Spodumene is transformed into industrial grade LiOH·H through traditional process transformation, acidification, leaching, freezing, evaporation, drying and other processes 2 O. Take 500 kg of industrial grade LiOH·H 2 Put O into the three-dimensional mixer, press the new activator and LiOH·H 2 The mass ratio of O is 0.8:100, and a new activator is added. The activator is composed of 70% C12 linear alkanes, 20% 2,5-dinonylheptane and 10% cyclopentane. . And the three-dimensional mixer is sealed, the mixing speed is 120 rpm, and the time is half an hour. Finally get environmentally friendly LiOH·H 2 O, the environmentally friendly LiOH·H obtained 2 O passes through a 320-mesh sample sieve, and the dust under the sieve (by mass percentage) is less than 0.5%.

Example Embodiment

[0038] Example 3:

[0039] Spodumene is transformed into industrial grade LiOH·H through traditional process transformation, acidification, leaching, freezing, evaporation, drying and other processes 2 O. Take 500 kg of industrial grade LiOH·H 2 Put O into the three-dimensional mixer, press the new activator and LiOH·H 2 The ratio of O is 0.5:100 and the new activator is added. The activator is in accordance with the ratio of 75% C15 linear alkanes, 20% 2,5-dimethyl-3-propyl octane and 5% cyclohexane. consist of. And the three-dimensional mixer is sealed, the revolution of the three-dimensional mixer is 50 revolutions per minute, and the time is half an hour. Finally get environmentally friendly LiOH·H 2 O, the environmentally friendly LiOH·H obtained 2 O passes through a 320-mesh sample sieve, and the dust under the sieve (calculated by mass percentage) is 0.6%.

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Abstract

The invention discloses a method for directly producing environment-friendly lithium hydroxide monohydrate from spodumene. The method includes (1) calcining: calcining 80-200 mesh spodumene powder under high temperature; (2) ball-milling: ball-milling the calcined spodumene to 200 mesh; (3) acidifying: mixing the milled spodumene with concentrated sulfuric acid, introducing into an acidification kiln, and acidifying at 200-300 DEG C; (4) leaching: mixing the acidified mineral powder with washing water in subsequent step to prepare pulp, and regulating pH value with calcium carbonate heavy. The environment-friendly lithium hydroxide has no air pollution, and no influence on application quality. Fine dust of the environment-friendly lithium hydroxide is adsorbed through a novel activator (alkane or cycloalkane), to agglomerate dust, cut off dust source, remove irritant odor of original product, and solve human body damage problem caused by original product.

Description

technical field [0001] The invention relates to the technical field of mineral smelting technology, in particular to using spodumene to directly produce environment-friendly LiOH.H 2 O's method. Background technique [0002] Lithium is a rare metal. Due to its unique physical and chemical properties, it has been widely used in military, chemical, optical, grease, refrigeration and other fields. It has the reputation of "energy metal". There are three ways to refine lithium: the first is extraction from spodumene; the second is extraction from lepidolite; the third is extraction from salt lake brine. In the prior art, there are mainly two methods for extracting lithium from spodumene: one is called the alkali method, which uses the spodumene-limestone method to produce lithium hydroxide monohydrate; the other is called the acid method, That is, lithium sulfate is produced by spodumene-sulfuric acid method, and lithium hydroxide monohydrate is produced after causticizati...

Claims

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Application Information

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IPC IPC(8): C01D15/02
Inventor 邓智林严显伟
Owner SICHUAN GUORUN NEW MATERIAL
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