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Device and process for extracting mirabilite from lithium deposition mother liquor for producing lithium salt from lithium mica

A technology of lepidolite and lithium precipitation, which is applied in the fields of alkali metal sulfite/sulfate purification, solution crystallization, chemical instruments and methods, etc., which can solve frequent parking and cleaning cycles, high energy consumption of recovery process, long crystallization time, etc. problems, to achieve the effect of preventing equipment blockage, reducing investment costs, and reducing temperature differences

Inactive Publication Date: 2019-05-28
河北云瑞化工设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The recycling process has high energy consumption, long crystallization time, large equipment volume, low crystallization yield, easy to block during the crystallization process, frequent shutdown and cleaning cycles

Method used

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  • Device and process for extracting mirabilite from lithium deposition mother liquor for producing lithium salt from lithium mica
  • Device and process for extracting mirabilite from lithium deposition mother liquor for producing lithium salt from lithium mica

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Embodiment 1

[0029] The invention provides a device for extracting Glauber's salt from lithium salt preprecipitation liquid produced from lepidolite, comprising a flash crystallization device and a freeze crystallization device, the flash crystallization device is connected with the freeze crystallization device, and the flash crystallization device is connected to the freeze crystallization device. The crystallization device is used to perform flash crystallization treatment on the material, and the freeze crystallization device is used to perform freeze crystallization treatment on the flashed material, and the flash crystallization device includes a two-stage precooler, a flash crystallizer 3 and a condenser 6, the two-stage pre-cooler includes a primary pre-cooler 1 and a secondary pre-cooler 2, the pre-cooler is used for preliminary cooling of materials, the pre-cooler and the flash crystallization The upper end of the flash crystallizer 3 is connected to the first exhaust port, and th...

Embodiment 2

[0031] The present invention also provides a process for extracting Glauber's salt from lithium salt preprecipitation liquid produced from lepidolite, comprising the following steps in sequence:

[0032] (1): The front-end lithium sinking liquid passes through the two-stage precooler in turn to reduce the temperature of the feed liquid to 40-45°C;

[0033] (2): The pre-precipitated lithium solution after cooling enters the flash crystallizer 3 to perform vacuum flash evaporation under the action of the flash circulation pump 4, and the flash evaporation temperature is controlled to be 20°C;

[0034] (3): Then, it is sent to the freezing crystallizer 23 through the flash discharge pump 5 to carry out freezing and crystallization through three sets of external coolers, and the circulation is cooled to 0°C-5°C;

[0035] (4): After the crystallization is completed, the material is sent to the thickener 18 by the crystallization discharge pump 17 of the freezing crystallizer 23, and ...

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Abstract

The invention relates to a device for extracting mirabilite from lithium deposition mother liquor for producing lithium salt from lithium mica, comprising a flash crystallization device and a freezingcrystallization device, wherein the flash crystallization device comprises a precooler, a flash crystallizer and a condenser, and the freezing crystallization device comprises a freeze crystallizer,an outer cooler, a thickener and a centrifuge. The invention also provides a process for extracting mirabilite from the lithium deposition mother liquor for producing lithium salt from lithium mica. Firstly the lithium deposition mother liquor is subjected to two-stage pre-cooling treatment, then mirabilite is obtained by recovering in the ways of flash crystallization and freeze crystallization,and a crystallization control scheme, anti-blocking measures and a cleaning system are arranged in the freezing crystallization system. Compared with a conventional process, on one hand, the process greatly reduces the system energy consumption, and on the other hand the risk of equipment clogging during crystallization is reduced.

Description

technical field [0001] The invention belongs to the technical field of cooling crystallization, and in particular relates to a device and a process for extracting Glauber's salt from lepidolite to produce lithium salt. Background technique [0002] At present, in the process of extracting lithium salts from lepidolite in China, the pre-precipitation solution contains a large amount of sodium sulfate. Sodium sulfate decahydrate is the main component of the traditional Chinese medicine Glauber's salt, which can be used for the treatment of symptoms such as stagnation of excess heat, abdominal fullness and pain, dry stool, intestinal pain, swelling and pain, etc., and has good medicinal value; sodium sulfate is used in the chemical industry, Paper industry, glass industry, textile industry and other fields have a wide range of applications, so it is necessary to precipitate the mirabilite crystals in the pre-precipitation solution. [0003] The existing technology for recoveri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/16B01D9/00B01D9/04
Inventor 赵敏刚周艳丽张伟翟民张彦博
Owner 河北云瑞化工设备有限公司
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