Flow guide type freezing crystallizer

A frozen crystallizer and crystallization tank technology, which is applied in heat exchange cooling crystallization, solution crystallization, crystallization adjustment/control, etc., can solve the problems of stopping production and cleaning heat exchangers, and having no technical advantages, so as to improve equipment production capacity and reduce scarring Risk, the effect of optimizing flow patterns

Inactive Publication Date: 2020-08-11
GANFENG LITHIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the disadvantage is that the problem of scabbing of heat exchange tubes has not been solved, and it is necessary to stop production frequently to clean the heat exchanger
Although it is a new technology, it has no absolute technical advantage over the traditional technology, so the traditional technology has not been eliminated.

Method used

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  • Flow guide type freezing crystallizer
  • Flow guide type freezing crystallizer
  • Flow guide type freezing crystallizer

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0032] Specific implementation method: see Figure 1-3 As shown, it includes crystallization tank, cooling system, stirring system and control system;

[0033] The crystallization tank includes a tank body 1, a bottom bracket, and a top bracket; the tank body 1 adopts the simplest cylindrical structure, which is beneficial to layout and installation, and is also beneficial to the layout of coils, baffles and other internal parts, and its length-to-diameter ratio is between Between 2:1 and 1:1, the manufacturing cost per unit volume is lower. The inner wall of the tank body 1 is provided with a cold insulation layer, and the cold insulation layer adopts the overall foaming spraying process, which has strong adhesion, no gaps, and good cold insulation effect; the tank body 1 is fixed on the bottom bracket; the top bracket is fixed on the upper part of the tank body 1, and the top bracket The bracket is used to support components such as the frequency conversion motor 13 and the...

Embodiment 1

[0061] Embodiment 1: the feed liquid of sodium sulfate solution consists of: LiOH 4.2%, NaOH 1.1%, Na 2 SO 4 31.0%, the feed temperature is 39°C;

[0062] During the crystallization process, it took 90 minutes at 40-25°C, 242 minutes at 25-5°C, 146 minutes at 10-0°C, and 110 minutes at 0-5°C, totaling 588 minutes, or 9.8 hours;

[0063] The crystal growth process takes 1h;

[0064] During the settling process, after 30 minutes, take a sample from the clear liquid port 4, and there is still a small amount of solids. After another 30 minutes of settling, there is no obvious solid in the sample taken from the clear liquid port 4, and the settling process takes 1 hour;

[0065] During the discharge process, it takes 58 minutes to discharge the clear liquid, and 74 minutes to discharge the crystal slurry, a total of 132 minutes, or 2.2 hours;

[0066] The whole process takes a total of 14.0 hours, and the composition of the clear liquid is: LiOH 9.5%, NaOH 2.5%, NaOH 2 SO 4 ...

Embodiment 2

[0067] Embodiment 2: the feed liquid of sodium sulfate solution consists of: LiOH 4.4%, NaOH 1.2%, NaOH 2 SO 4 30.5%. The feed temperature was 37°C.

[0068] During the crystallization process, it took 86 minutes at 40-25°C, 236 minutes at 25-5°C, 148 minutes at 10-0°C, and 115 minutes at 0-5°C, totaling 585 minutes, or 9.8 hours;

[0069] The crystal growth process takes 1h;

[0070] During the settling process, take a sample from the clear liquid port 4 after 30 minutes, there is no obvious solid, and the settling process takes 0.5h;

[0071] During the discharge process, it takes 55 minutes to discharge the clear liquid and 75 minutes to discharge the crystal slurry, a total of 130 minutes, that is, 2.2 hours;

[0072] The whole process takes a total of 13.4 hours, and the composition of the clear liquid is: LiOH 9.8%, NaOH 2.7%, NaOH 2 SO 4 4.2%. Na 2 SO 4 ﹒ 10H 2 O crystallization rate 93.8%

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Abstract

The invention discloses a flow guide type freezing crystallizer which comprises a crystallizing tank, a cooling system, a stirring system and a control system; the crystallizing tank comprises a tankbody; a cold insulation layer is arranged on the inner wall of the tank body; a manhole, a feeding hole, a liquid level meter hole, a clear liquid hole, a crystal mush hole and a thermometer hole areformed in the tank body; the cooling system comprises an inlet header pipe, a racemization coil pipe, a flow guide coil pipe, an outlet header pipe and a bracket; the stirring system comprises a variable frequency motor, a speed reducer, a water seal, a rigid shaft, a push type paddle and a bottom cone; the control system comprises a liquid level sensor, a feeding switch valve, a temperature sensor, a refrigerant regulating valve, an ampere meter, a variable frequency controller, a clear liquid switch valve, a crystal mush switch valve and a logic controller; compared with a conventional intermittent groove type freezing crystallizer, the flow guide type freezing crystallizer has the advantages of being large in heat exchange area, large in capacity, few in scabs and the like, has a certain crystal selection function and a crystal slurry thickening function, and facilitates subsequent crystal slurry solid-liquid separation operation.

Description

technical field [0001] The invention relates to a crystallizer, in particular to a flow-guiding freezing crystallizer. Background technique [0002] In the sulfuric acid metallurgical process, such as the production of lithium carbonate and lithium hydroxide monohydrate by the spodumene sulfuric acid method, a large amount of sodium sulfate will be produced due to the use of sulfuric acid and soda ash or liquid caustic soda. Whether sodium sulfate can be removed from the product solution with high efficiency and low consumption often affects production capacity and cost. The removal of sodium sulfate often adopts two methods: evaporative crystallization and freezing crystallization. [0003] In the production process of lithium hydroxide, the method of freezing and crystallization is often used to obtain a higher primary crystallization rate of sodium sulfate. During the freezing process, sodium sulfate is precipitated in the form of sodium sulfate heptahydrate or sodium s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D9/02
CPCB01D9/0013B01D9/005B01D9/0063
Inventor 李良彬罗光华李广梅胡斌周晴彭文革符龙朱志全符礼冬李海桃黄小强
Owner GANFENG LITHIUM CO LTD
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