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Two-stage chlorination roasting-alkali leaching method extracts lithium from lepidolite and prepares lithium carbonate

A technology of lye leaching and chlorination roasting, which is applied in the field of metallurgy, can solve the problems of large amount of chlorination agent, environmental pollution, equipment corrosion, etc., and achieve the effects of high recovery rate, reduced energy consumption, and low cost

Active Publication Date: 2021-10-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the amount of chlorinating agent used in the chlorination roasting method is relatively large, and excessive HCl gas will be generated during the chlorination roasting process, which will cause great corrosion to the equipment and cause environmental pollution, and the chlorination roasting temperature is above 800 ° C, and the energy consumption is high.

Method used

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  • Two-stage chlorination roasting-alkali leaching method extracts lithium from lepidolite and prepares lithium carbonate

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Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 1 Shown, a kind of two-stage chlorination roasting-lye leaching method extracts lithium from lepidolite and prepares the method for lithium carbonate, comprises the following steps:

[0039] (1) Will Li 2 Lepidolite with O content of 3.8% and calcium chloride are ground and mixed at a mass ratio of 1:0.5, and then wetted with a certain quality of ammonium chloride solution to form pellets to obtain green pellets with a particle size of 15mm (if the pellets need to be dried, they can be roasted) Drying the raw pellets can reduce part of the water and reduce the energy loss of the subsequent chlorination treatment. Generally, the pelletizing process needs to add water several times. According to the principle of "reduce water when the ball is large, and add water when the ball is small", control The mass ratio of ammonium chloride to lepidolite is 0.3:1;

[0040] (2) The green balls obtained in step (1) are roasted for 1 hour at 150°C, and then roasted fo...

Embodiment 2

[0046] A two-stage chlorination roasting-lye leaching method extracts lithium from lepidolite and prepares lithium carbonate, comprising the following steps:

[0047] (1) Will Li 2 Lepidolite with O content of 4.5% and calcium chloride are ground and mixed at a mass ratio of 1:0.5, and then wetted with a certain mass of ammonium chloride solution to obtain green pellets with a particle size of 10mm (if the pellets need to be dried, they can be roasted) Drying the raw pellets can reduce part of the water and reduce the energy loss of the subsequent chlorination treatment. Generally, the pelletizing process needs to add water several times. According to the principle of "reduce water when the ball is large, and add water when the ball is small", control The mass ratio of ammonium chloride and lepidolite is 0.5:1;

[0048] (2) Carry out the green ball obtained in the step (1) at 200 ℃ for 0.5h, and then at 650 ℃ for 2.5h to obtain clinker (can be carried out in the same calcinat...

Embodiment 3

[0054] A two-stage chlorination roasting-lye leaching method extracts lithium from lepidolite and prepares lithium carbonate, comprising the following steps:

[0055] (1) Will Li 2 O content of 4.3% lepidolite and calcium chloride are ground and mixed at a mass ratio of 1:0.5, and then wetted with a certain quality of ammonium chloride solution to form pellets to obtain green pellets with a particle size of 10mm (if the pellets need to be dried, they can be roasted) Drying the raw pellets can reduce part of the water and reduce the energy loss of the subsequent chlorination treatment. Generally, the pelletizing process needs to add water several times. According to the principle of "reduce water when the ball is large, and add water when the ball is small", control The mass ratio of ammonium chloride to lepidolite is 0.4:1;

[0056] (2) Carry out the green ball obtained in step (1) at 250 ℃ for 0.5h, and then at 550 ℃ for 1.5h to obtain clinker (can be carried out in the same...

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Abstract

The invention discloses a method for preparing lithium carbonate from lepidolite by extracting lithium from lepidolite by a two-stage chlorination roasting-alkali leaching method, comprising the following steps: (1) grinding lepidolite ore and calcium chloride and adding it to chlorine mixing in the ammonium chloride solution to obtain green pellets; (2) performing one-stage roasting on the green pellets obtained in step (1) at 150-300°C, and then performing second-stage roasting at 500-800°C to obtain clinker; (3) leaching the clinker obtained in step (2) with water, and filtering to obtain the leachate; (4) adding carbonate solution to the leachate obtained in step (3), stirring and filtering to obtain mother liquor and filter residue, collecting the filter residue to obtain carbonic acid lithium. In the present invention, each step cooperates and acts synergistically, and the process of extracting lithium from lepidolite to prepare lithium carbonate is environmentally friendly, has low energy consumption, low cost, high extraction efficiency, and has broad industrial application prospects.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular to a method for preparing lithium carbonate by extracting lithium from lepidolite. Background technique [0002] As a new type of energy and strategic resource, lithium is known as "the energy metal that promotes the progress of the world", and it is widely used in various fields of the national economy. Lithium metal not only plays an important role in traditional consumer fields such as glass, ceramics, and lubricants, but also promotes the development of high-tech fields such as lithium batteries, nuclear energy, and aerospace. Especially with the rapid development of the new energy automobile industry, wearable devices and large-scale energy storage devices, the demand for lithium in the global market is increasing year by year. my country has abundant lepidolite resources, among which Li 2 The content of O is generally around 4%. At present, the methods for extracting lithium from ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/08C22B1/24C22B3/46C22B26/12
CPCC22B1/08C22B1/2406C22B3/46C22B26/12Y02P10/20
Inventor 王接喜肖晓李新海王志兴郭华军颜果春胡启阳彭文杰
Owner CENT SOUTH UNIV
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