Method freezing separating mirabilite by brine solution

A technology for freezing separation and brine solution, which is applied in the field of separation of mirabilite from high awning brine solution, can solve the problems of wasting energy, frequently brushing tanks or cleaning heat exchangers, shortening production cycle, etc., and achieves extended operation cycle, reduced cost and stable process. Effect

Inactive Publication Date: 2007-09-26
山东布莱恩化工技术有限公司
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Problems solved by technology

When the pre-cooled Gaomang brine enters the refrigeration heat exchange system and the temperature is further lowered, because sodium sulfate decahydrate precipitates after forming crystals, it is extremely easy to block the refrigeration heat exchanger and pipelines. This process is applied when the sulfate concentration is less than 30g /L solution can also maintain a long period of operation, when the concentration of sulfate radicals exceeds this value,

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  • Method freezing separating mirabilite by brine solution
  • Method freezing separating mirabilite by brine solution

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Embodiment Construction

[0017] The method for freezing and separating Glauber's salt of the present invention will be further described below with reference to the drawings and specific embodiments.

[0018] The process of the method for freezing and separating Glauber's salt with brine solution is shown in Figure 2. The high-salt solution of mirabilite comes from the fields of chlor-alkali, soda ash, salt production, etc., using NF method, MRO method, RO method and other new de-mirabilite processes to obtain sodium sulfate Concentration of saline solution. The specific separation process is:

[0019] 1) After the high-mountain salt solution produced by the removal of sulfate radicals from the nanofiltration membrane, reverse osmosis membrane and modified reverse osmosis membrane technology, first adjust the pH to alkaline with NaOH, and the pH is preferably 9 to 11 , In order to reduce the corrosion of acidic solution to the equipment in the subsequent process;

[0020] 2) The cold brine with a temperat...

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Abstract

The invention discloses a method of cold separating mirabilite in salt water solution, which comprises the following steps: (1) adjusting pH value of armed salt cake solution as alkalify; (2) proceeding pre-cool in the precooling system; (3) mixing with low-temperature low-nitrate water of incorporating salt cake with lower temperature through demirabilite treatment; controlling temperature at -10-0 deg.c; proceeding solid-liquid separation in salt cake settler; getting ten water sodium sulfate crystal and low nitrate water; (4) lowering temperature of part low nitrate water through freezing heat exchanger; recycling as low temperature nitrate water of step (3); discharging the other part of low nitrate water as byproduct.

Description

Technical field [0001] The invention relates to a method for separating Glauber's salt from an aqueous solution of Glauber's salt, which is used for the treatment of an aqueous solution of Glauber's salt in chlor-alkali, soda ash, salt making and other industries. Background technique [0002] In the membrane denitrification technology of chlor-alkali and other fields, the brine solution containing high sodium sulfate concentration is called high awn brine. There are currently the following treatment methods: [0003] One is to use the discharge method to achieve the purpose of eliminating sulfate. Although sulfate can be removed, the concentrated solution also contains sodium chloride. If the concentrated solution is directly discharged without treatment, sodium chloride will also be discharged. Will pollute the environment and increase operating costs. [0004] The second is to use the conventional freezing method, the principle is to use NaCl and Na 2 SO 4 The difference in th...

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Application Information

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IPC IPC(8): C01D5/00
Inventor 李德敏宋绍勇宋作强
Owner 山东布莱恩化工技术有限公司
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