Process for producing salt through concentrating strong brine after sea water desalination adopting two-way cycle method and bromine extraction

A two-way cycle, concentrated brine technology, applied in seawater treatment, water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as low production efficiency, pollution, and poor quality, and achieve high quality and low cost Effect

Active Publication Date: 2014-09-10
QINGDAO EASTERN SEA OASIS SEAWATER TREATMENT TECH CO LTD
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Problems solved by technology

[0002] The current field drying salt process method occupies a large area, has low production efficiency, high cost and poor quality
However, seawater desalination projects implemented in freshwater-scarce areas cannot adapt to the market price due to the high cost of water production. After the freshwater is extracted, the salt water can not be used, and the discharge will cause pollution.

Method used

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  • Process for producing salt through concentrating strong brine after sea water desalination adopting two-way cycle method and bromine extraction
  • Process for producing salt through concentrating strong brine after sea water desalination adopting two-way cycle method and bromine extraction
  • Process for producing salt through concentrating strong brine after sea water desalination adopting two-way cycle method and bromine extraction

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Embodiment 1

[0045] Embodiment 1, a two-way circulation method seawater desalination and extracting bromine concentrated brine concentration salt production process, comprising the following steps:

[0046] A. Firstly, the seawater is passed through the high-pressure reverse osmosis unit to produce fresh water and concentrated brine through the reverse osmosis method, and the concentration of the prepared concentrated brine is 70000~80000PPM (7~8°);

[0047] B. The concentrated brine with a concentration of 70000~80000PPM is used for two-way circulation by the concentration difference method to separate the concentration until the concentrated brine crystallizes.

[0048] C. In the process of separating the thick and thin brine, the magnesium chloride, potassium chloride and bromine contained in the brine are sequentially extracted.

[0049] In the above step B, the concentration difference method is carried out in a two-way cycle for concentration separation process, including the followi...

Embodiment 2

[0055] Embodiment 2, in above-mentioned embodiment 1, magnesium chloride extraction adopts physical method, the extraction that carries out in 14~16 degree concentrated brine area, after magnesium chloride crystallizes when about 15 °, proposes magnesium chloride crystal.

Embodiment 3

[0056] Embodiment 3, in above-mentioned embodiment 1, potassium chloride extraction adopts physical method, the extraction that carries out in 25~26 degree concentrated brines, after potassium chloride crystallizes when about 25 °, proposes potassium chloride crystals.

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Abstract

The invention discloses a process for producing salt through concentrating strong brine after sea water desalination adopting two-way cycle method and bromine extraction. The process comprises the following steps of A, preparing fresh water and strong brine from sea water through a reverse osmosis process in a high-pressure reverse osmosis unit, wherein the concentration of the prepared strong brine is 70000-80000PPM; and B, performing fresh and concentrated separation on the strong brine with the concentration of 70000-80000PPM by utilizing a concentration difference method by adopting two-way cycle until the strong brine is crystallized. The salt is produced by carrying out sea water desalination on the strong brine, the problem that pollution is caused due to discharge of the strong brine after sea water desalination is solved, the yield in unit area is 30-50 times of the yield of a salt pan producing method, and the cost is far lower than that of salt pan production.

Description

technical field [0001] The invention relates to a process for separating and extracting table salt, bromine, potassium chloride and magnesium chloride from seawater, in particular to a two-way circulation method for desalination of seawater and concentration of concentrated brine for salt production after extracting bromine, which belongs to seawater desalination and industrial The technical field of salt production coupling. Background technique [0002] The current field drying salt process method occupies a large area, has low production efficiency, high cost and poor quality. However, seawater desalination projects implemented in freshwater-scarce areas cannot meet the market price due to the high cost of water production. After the freshwater is extracted, the salt water can not be used, and the discharge will cause pollution. Contents of the invention [0003] The problem to be solved by the present invention is to provide a two-way circulation method that can reduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06C01F5/30C01B7/09
CPCC02F1/441B01D61/025B01D2311/08C01B7/096C01B35/121C01D3/06C01D3/10C01F5/30C02F2103/08Y02A20/131Y02W10/37
Inventor 蔡泮敏
Owner QINGDAO EASTERN SEA OASIS SEAWATER TREATMENT TECH CO LTD
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