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 the problems of no pollution, damage, etc., and achieve the effect of good fluidity and crystal enlargement

Active Publication Date: 2014-03-12
SICHUAN GUORUN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 the original product, and solve the problems of the original product causing harm to the human body and no pollution to the air. ·H 2 O's method

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The 200-mesh spodumene powder was roasted for 30 minutes under high temperature conditions, wherein: 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; the concentrated sulfuric acid with a concentration of 98% is mixed evenly with the spodumene powder after ball milling, and the reaction temperature is controlled at 250?? C: Make a slurry of acidified ore and water, add Shuangfei powder and adjust the pH value to 5.5, then add quicklime or lime slurry to adjust the pH value 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 discharged to make bricks. First, add NaOH and the mother liquor separated in step (9) to the liquid separated in step (5) and stir evenly; send it to the freezing tank to cool down to 0 degrees Precipitate sodium sulfate crystals, separate sodium sulfate crystals with a se...

Embodiment 2

[0037] Spodumene is made into industrial-grade LiOH·H 2 O. Take 500 kg of industrial grade LiOH·H 2 O was placed in a three-dimensional mixer, and the new activator was mixed with LiOH·H 2 The mass ratio of O is 0.8:100, and a new activator is added, which is composed of 70% C12 linear alkanes, 20% 2,5-dinonylheptane and 10% cyclopentane . And seal the three-dimensional mixer, the mixing rotation number is 120 rpm, and the time is half an hour. Finally, the environmentally friendly LiOH·H 2 O, the resulting environmentally friendly LiOH·H 2 O Pass through a 320-mesh sieve, wherein the dust in the under-sieve (by mass percentage) is <0.5%.

Embodiment 3

[0039] Spodumene is made into industrial-grade LiOH·H 2 O. Take 500 kg of industrial grade LiOH·H 2 O was placed in a three-dimensional mixer, and the new activator was mixed with LiOH·H 2The ratio of O is 0.5:100 to add a new type of activator, the activator is based on the ratio of 75% C15 linear alkanes, 20% 2, 5-dimethyl-3-propyl octane and 5% cyclohexane consist of. And seal the three-dimensional mixer, the number of revolutions of the three-dimensional mixer is 50 rpm, and the time is half an hour. Finally, the environmentally friendly LiOH·H 2 O, the resulting environmentally friendly LiOH·H 2 O pass through a 320-mesh sieve, wherein the dust (by mass percentage) of the part under the sieve 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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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/02
Inventor 邓智林严显伟
Owner SICHUAN GUORUN NEW MATERIAL
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