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Method for crystallizing magnesium sulfate

A technology of magnesium sulfate and magnesium sulfate mother liquor, which is applied in the direction of magnesium sulfate, solution crystallization, heat exchange cooling crystallization, etc., can solve the problems of low energy consumption and low eutectic point temperature, achieve low energy consumption, increase eutectic temperature, The effect of improving product quality

Active Publication Date: 2022-03-08
桐乡市思远环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of this invention is to provide a kind of method for magnesium sulfate crystallization, by increasing the eutectic point temperature of magnesium sulfate for system pressurization, overcome prior art EFC co-crystallization The technical defect of low crystal point temperature and the advantage of low energy consumption

Method used

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  • Method for crystallizing magnesium sulfate

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Embodiment 1

[0027] Prepare 5 L of magnesium sulfate solution with magnesium sulfate content of 17.3%. Ice water is used as the cooling medium to pre-cool 5L magnesium sulfate solution to 5°C through the shell and tube heat exchanger. The pre-cooled magnesium sulfate solution is pumped into the crystallizer, and the crystallizer is stirred to 250rpm. Inside the crystallizer, stop feeding carbon dioxide gas after the pressure shows 4.0Mpa, the ethylene glycol refrigerant continues to cool the magnesium sulfate solution through the jacket of the crystallizer, and stop precooling when the internal temperature of the crystallizer drops to 6.5°C, at this time CO 2 and feed valve closed. The pressure and temperature were maintained for an additional 1.0 hour, and crystallization was observed. The upper layer of the crystallizer forms a clathrate of carbon dioxide clathrate, and when the pressure is slightly lowered, CO is added 2 , otherwise it will lead to the decomposition of some carbon dio...

Embodiment 2

[0029] Prepare 5 L of magnesium sulfate solution with magnesium sulfate content of 17.3%. Ice water is used as the cooling medium to pre-cool 5L magnesium sulfate solution to 5°C through the shell and tube heat exchanger. The pre-cooled magnesium sulfate solution is pumped into the crystallizer, and the crystallizer is stirred to 250rpm. Inside the crystallizer, stop feeding carbon dioxide gas after the pressure shows 3.0Mpa. The ethylene glycol refrigerant continues to cool the magnesium sulfate solution through the jacket of the crystallizer. When the internal temperature of the crystallizer drops to 5.0°C, stop precooling. At this time, CO 2 and feed valve closed. The pressure and temperature were maintained for an additional 1.0 hour, and crystallization was observed. The upper layer of the crystallizer forms a clathrate of carbon dioxide clathrate, and when the pressure is slightly lowered, CO is added 2 , otherwise it will lead to the decomposition of some carbon dioxi...

Embodiment 3

[0031] Prepare 5 L of magnesium sulfate solution with magnesium sulfate content of 17.3%. Ice water is used as the cooling medium to pre-cool 5L magnesium sulfate solution to 5°C through the shell and tube heat exchanger. The pre-cooled magnesium sulfate solution is pumped into the crystallizer, and the crystallizer is stirred to 250rpm. Inside the crystallizer, stop feeding carbon dioxide gas after the pressure shows 2.0Mpa. The ethylene glycol refrigerant continues to cool the magnesium sulfate solution through the jacket of the crystallizer. When the internal temperature of the crystallizer drops to 1.9°C, stop precooling. At this time, CO 2 and feed valve closed. The pressure and temperature were maintained for an additional 1.0 hour, and crystallization was observed. The upper layer of the crystallizer forms a clathrate of carbon dioxide clathrate, and when the pressure is slightly lowered, CO is added 2 , otherwise it will lead to the decomposition of some carbon dioxi...

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Abstract

The invention discloses a magnesium sulfate crystallization method which comprises the following steps: (a) precooling a prepared magnesium sulfate solution in a heat exchanger, pumping the precooled magnesium sulfate solution into a crystallizer, simultaneously introducing CO2 gas into the crystallizer, cooling the crystallizer through a refrigerant, maintaining certain pressure and temperature in the crystallizer, and carrying out crystallization on the magnesium sulfate solution; forming a magnesium sulfate mixture and a carbon dioxide inclusion compound after a certain time; and (b) discharging the magnesium sulfate mixture through a discharge port at the bottom of the crystallizer, and carrying out solid-liquid separation on the magnesium sulfate mixture to obtain magnesium sulfate solid and magnesium sulfate mother liquor. According to the magnesium sulfate crystallization method adopting the structure, the eutectic point temperature of magnesium sulfate is increased by pressurizing the system, the technical defect of low eutectic point temperature of EFC in the prior art is overcome, and the method has the advantage of low energy consumption.

Description

technical field [0001] The invention relates to the technical field of salt recovery, in particular to a method for magnesium sulfate crystallization. Background technique [0002] Separation processes are crucial in many industrial processes for recovering salt from aqueous solutions or for reducing waste water. Cooling crystallization is a commonly used technique for salt production, but its yield is limited by salt solubility. To overcome this limitation, solutions must be concentrated by removing water. Eutectic freeze crystallization (EFC) is a new technology for treating high-salt wastewater. EFC technology cools high-salt wastewater to the eutectic point temperature. When the solution reaches the eutectic state, ice and salt coexist in the crystallizer at the same time. Due to the difference in density between the ice and salt, the ice will be suspended on the top of the saturated solution, while the salt will sink to the bottom of the crystallizer, and the two soli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D9/02C01F5/40
CPCB01D9/0009C01F5/40
Inventor 董飘平蒋航宇王璐赵尹刘宇豪
Owner 桐乡市思远环保科技有限公司
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