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Two-way circulation method for desalination of seawater and extraction of bromine followed by concentrated brine concentration salt production process

A two-way circulation and concentrated brine technology is applied in the two-way circulation method for seawater desalination and extraction of bromine, concentrated brine salt production process, magnesium chloride, bromine, potassium chloride, separation and extraction of table salt, which can solve pollution, low production efficiency, Large footprint and other issues, to achieve the effect of low cost and high quality level

Active Publication Date: 2015-08-05
QINGDAO EASTERN SEA OASIS SEAWATER TREATMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Two-way circulation method for desalination of seawater and extraction of bromine followed by concentrated brine concentration salt production process
  • Two-way circulation method for desalination of seawater and extraction of bromine followed by concentrated brine concentration salt production process
  • Two-way circulation method for desalination of seawater and extraction of bromine followed by concentrated brine concentration salt production process

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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 70,000-80,000ppm is used for two-way circulation by the concentration difference method to separate the concentrated brine until the 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 to carry out the process of separation of concentration, includin...

Embodiment 2

[0055] Embodiment 2, in above-mentioned embodiment 1, magnesium chloride extraction adopts physical method, the extraction that carries out in 140000~160000ppm strong brine area, after magnesium chloride crystallizes when about 150000ppm, 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 250000~260000ppm concentrated brine, after potassium chloride crystallizes when about 250000ppm, 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 r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/06C01F5/30C01B7/09
CPCC01D3/06C01F5/30C01D3/10B01D2311/08Y02W10/37Y02A20/131B01D61/025C01B7/096C01B35/121C02F1/441C02F2103/08B01D2311/26B01D2311/2669
Inventor 蔡泮敏
Owner QINGDAO EASTERN SEA OASIS SEAWATER TREATMENT TECH CO LTD