Production process of lithium chloride

A production process, lithium chloride technology, applied in the field of lithium extraction process, can solve the problems of shortage of lithium chloride, lithium metal and lithium salt resources, unfavorable industrial production and use, and very high requirements for adsorbents, so as to solve the problems of lithium metal and lithium salt The effect of shortage, convenient production process and high purity

Active Publication Date: 2017-05-10
ЦИНХАЙ СОЛТ ЛЕЙК ИНДАСТРИ ГРУП КО ЛТД
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a production process of lithium chloride, which is used to solve the problem that the existing lithium chloride preparation process cannot fundamentally solve the problem of shortage

Method used

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Examples

Experimental program
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Example Embodiment

[0069] Example one

[0070] This embodiment provides a production process of lithium chloride, which includes the following steps:

[0071] Step S1: using reverse osmosis and electrodialysis to concentrate the raw brine. Among them, the raw material brine is prepared after the process of extracting lithium from salt lake brine by ion exchange adsorption method. The lithium ion concentration in the raw material brine in this embodiment is 0.4g / L, the magnesium ion concentration is 0.5g / L, and the sodium ion concentration It is 0.3g / L, and the chloride ion concentration is 2.5g / L.

[0072] (a) First, the raw brine is treated by reverse osmosis to obtain the raw brine concentrate. The lithium concentration in the prepared raw brine concentrate is 4.0 g / L, and the prepared light brine is reused for ion exchange in the salt lake brine Lithium extraction step by adsorption method.

[0073] (b) Next, the first qualified liquid obtained by treating the raw brine concentrate by the electrodi...

Example Embodiment

[0088] Example two

[0089] The production process of this embodiment is the same as that of the first embodiment, except that the ingredients used in the raw brine are: lithium ion concentration is 0.8g / L, magnesium ion concentration is 1.5g / L, sodium ion concentration is 0.5g / L, chlorine The ion concentration is 4g / L.

[0090] In the first qualified liquid prepared after the first concentration process in step S1, the lithium concentration is 25 g / L. In the second qualified solution obtained after purification by the first adsorption process in step S2, the concentration of calcium ions is 0.015 mg / L, the concentration of magnesium ions is 0.016 mg / L, the concentration of boron ions is 0.3 mg / L, and the organic matter The concentration is 3.8mg / L. In the third qualified liquid prepared after the second concentration process in step S3, the lithium ion concentration is 100 g / L and the sodium ion concentration is 3.5 g / L. In the fourth qualified liquid purified through the secon...

Example Embodiment

[0092] Example three

[0093] The production process of this embodiment is the same as that of the first embodiment, except that the ingredients used in the raw brine are: lithium ion concentration is 0.5g / L, magnesium ion concentration is 1.0g / L, sodium ion concentration is 0.4g / L, chlorine The ion concentration is 3g / L.

[0094] In the first qualified liquid prepared after the first concentration process in step S1, the lithium concentration is 20 g / L. In the second qualified solution obtained after purification by the first adsorption process in step S2, the concentration of calcium ions is 0.010 mg / L, the concentration of magnesium ions is 0.011 mg / L, the concentration of boron ions is 0.4 mg / L, and the organic matter The concentration is 4.0mg / L. In the third qualified liquid prepared after the second concentration process in step S3, the lithium ion concentration is 90 g / L and the sodium ion concentration is 5 g / L. In the fourth qualified liquid purified through the second...

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Abstract

The invention discloses a production process of lithium chloride. The production process of the lithium chloride comprises the steps: S1, increasing the lithium concentration of raw material brine to be 15 to 25 g/L by a first concentration procedure to prepare first qualified liquid; S2, purifying the first qualified liquid by a first adsorption procedure and removing calcium and magnesium ions and boron ions to prepare second qualified liquid; S3, increasing the lithium concentration of the second qualified liquid to be 80 to 100 g/L by a second concentration procedure to prepare third qualified liquid, wherein the sodium ion concentration is less than 5 g/L; S4, purifying the third qualified liquid by a second adsorption procedure until the sodium ion concentration is less than 5 mg/L to prepare fourth qualified liquid; and S5, dehydrating the fourth qualified liquid to prepare anhydrous lithium chloride. According to the production process of the lithium chloride, provided by the invention, the recovery rate of the lithium ions is high, the purity of the prepared anhydrous lithium chloride product can reach above 99.3 percent, and the production process is suitable for industrialized large-scale production.

Description

technical field [0001] The invention relates to the technical field of lithium extraction technology, in particular to a technology for producing lithium chloride using salt lake brine as raw material. Background technique [0002] Lithium metal is widely used in rechargeable batteries, glass, ceramics, alloys, lubricants, medicine and other fields, especially rechargeable lithium batteries have received extensive attention as the main power source of hybrid and electric vehicles in recent years. In addition, there is a huge market for using lithium in existing small batteries such as mobile phones and notebook computers. As a result, lithium metal is in high demand both domestically and abroad across the industrial spectrum. The only current industrial method for producing lithium metal is lithium chloride molten salt electrolysis. Therefore, in order to meet the market demand for metallic lithium, it is necessary to greatly increase the production of lithium chloride. L...

Claims

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Application Information

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IPC IPC(8): C01D15/04
CPCC01D15/04C01P2006/80
Inventor 何永平王文海邢红王石军毛新宇宁鹏张占伟杨建育马存彪马汉晓齐唯张荣子严雄仲
Owner ЦИНХАЙ СОЛТ ЛЕЙК ИНДАСТРИ ГРУП КО ЛТД
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