Clean and energy-saving type production and salt preparation process

An energy-saving and technological technology, applied in the field of clean and energy-saving production of salt-making technology, can solve the problems of large environmental pollution, high energy consumption of the salt-making process, low resource utilization rate, etc., and achieve the effect of improved purity and obvious quality advantages.

Active Publication Date: 2018-01-12
CHINASALT JINTAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problems to be solved by the present invention are: the existing salt making

Method used

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  • Clean and energy-saving type production and salt preparation process
  • Clean and energy-saving type production and salt preparation process
  • Clean and energy-saving type production and salt preparation process

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0039] Example 1

[0040] To NaCl 300g / L, Na 2 SO 4 12g / L and contains CaSO 4 , MgSO 4 Add lime milk (Ca(OH) in lime milk) to the brine of the raw material of impurities 2 Is 80g / L, the molar ratio of calcium ion to sulfate ion in brine is controlled to be 1.05:1), and then lime flue gas (CO 2 The volume concentration is 15%, SO 2 The volume concentration is 1%, the rest is nitrogen, oxygen, and water vapor). Treat the brine. When the brine pH value reaches 10, stop the lime flue gas to precipitate calcium and magnesium ions in the original brine, and remove the reacted brine. After being filtered by the coarse filter, pump into the ceramic ultrafiltration membrane filtration device to remove calcium and magnesium;

[0041] The resulting clarified liquid (mainly containing sodium ions, chloride ions and sulfate ions) are all put into the mechanical thermal compression (MVR) evaporation crystallization technology to prepare solid salt: the clarified liquid is heated by the multi-sta...

Example Embodiment

[0058] Example 2

[0059] To NaCl 300g / L, Na 2 SO 4 12g / L and contains CaSO 4 , MgSO 4 Add lime milk (Ca(OH) in lime milk) to the brine of the raw material of impurities 2 80g / L, control the molar ratio of calcium ions to sulfate ions in the brine to 1.05:1), and then use lime flue gas through the desulfurization device to treat the brine, and stop the lime flue gas when the brine pH reaches 10 , To precipitate the calcium ions and magnesium ions in the original brine, filter the reacted brine through a coarse filter, and pump it into a ceramic ultrafiltration membrane filter device to remove calcium and magnesium;

[0060] After the above-mentioned purification, the brine clarified liquid is divided into two paths, one is fed into the storage tank for standby, the other is mixed with dilute brine, and after mixing, it passes through the pretreatment system and is pumped into the nanofiltration membrane for separation to reduce the sulfate content in the brine. After filtration, t...

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Abstract

The invention belongs to the field of clean production, and particularly relates to a clean and energy-saving type production and salt preparation process. Firstly, lime cream is fed into raw materialbrine; then, the brine is processed by a lime flue gas method; the reacted brine is filtered by a coarse filter, and is then pumped into a ceramic filtering membrane filtering device to remove calcium and magnesium; the obtained clear liquid is used for preparing liquid salt or is fed into machinery for preparing solid salt through a hot compression MVR evaporative crystallization technology.

Description

technical field [0001] The invention belongs to the field of clean production, and in particular relates to a clean and energy-saving salt production process. Background technique [0002] Salt is the mother of industry and plays a very important role in the national economy. However, the traditional salt production consumes a lot of energy, produces a large amount of salt mud, and has serious environmental problems. It is urgent to develop new salt production processes. As a raw material for two alkalis, from mining salt to soda ash production, on the one hand, it has to go through five "from solid to liquid" conversions. In my country, only two alkalis consume 80 million tons of salt per year, which consumes a lot of energy; on the other hand The salt refining process produces a large amount of salt mud, and solid waste of about 2 million tons per year has become a bottleneck restricting the development of the salt industry and the chlor-alkali industry. Therefore, it is ur...

Claims

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Application Information

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IPC IPC(8): C01D3/06C01D5/00B01D53/81B01D53/50
CPCY02P20/10
Inventor 陈留平赵营峰朱旭初李文华徐敏崔耀星
Owner CHINASALT JINTAN
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