Brine concentration method for sea salt production

A technology for concentrating brine and sea salt, which is used in seawater treatment, general water supply conservation, chemical instruments and methods, etc. The effect of reducing the sunning area and reducing the production cost

Active Publication Date: 2018-04-24
山东省盐业集团有限公司
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Problems solved by technology

[0003] Traditional sea salt production is realized through tanning in salt fields, which covers a large area, is seriously affected by climate, and has a long salt production cycl

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  • Brine concentration method for sea salt production

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Embodiment

[0038] The production capacity of raw seawater or concentrated seawater pretreatment is 15,000 tons / day, after that, the concentration of concentrated seawater is 4~5°Bé, of which sodium ion is 18.3g / L, calcium ion is 0.6~0.7g / L, magnesium ion is 1.8~2.2 g / L, sulfate ion 3.5~4.5g / L, chloride ion 29~31g / L, bromide ion 0.1g / L.

[0039] Concentrated seawater enters the nanofiltration device, the recovery rate is 55%~65%, the concentration of nanofiltration water is 3~4°Bé, sodium ion is 16~17g / L, calcium ion is 0.05g / L, magnesium ion is 0.02g / L, sulfate radical Ion 0.02g / L, chloride ion 26~27g / L.

[0040] The water produced by the nanofiltration device enters the high-pressure reverse osmosis device for concentration. After concentration, the concentration of the product water is 9-12°Bé, the sodium ion is 60-65g / L, the calcium ion is 0.15g / L, the magnesium ion is 0.06g / L, and the sulfate ion is 0.06 g / L, chloride ion 60~100g / L; the better conductivity of the high-pressure rever...

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Abstract

The invention provides a brine concentration method for sea salt production and belongs to the technical field of sea salt production. The method comprises steps as follows: seawater enters a pretreatment device for removal of impurities and enters a nanofiltration device for removal of divalent ions, nanofiltration producing water enters a multi-stage high-pressure reverse osmosis device for highconcentration, and high-concentration saline water is prepared; part of high-pressure reverse osmosis producing water is subjected to low-pressure reverse osmosis for preparation of pure water, and the other part of water flows back to a seawater desalting plant. The multi-stage high-pressure reverse osmosis device is formed through series connection of high-pressure reverse osmosis membrane groups in a form of continuous section groups, producing water of each section of the high-pressure reverse osmosis membrane groups flows back for use or enters a pure water preparation process, concentrated water of each section of the high-pressure reverse osmosis membrane groups enters the downstream high-pressure reverse osmosis membrane groups, the purpose of high concentration is finally achieved through continuous series connection, and strong brine is prepared. According to the method, more efficient concentration is realized, factory brine preparation is realized, the tedding area for salt making is greatly reduced, graded reuse of producing water is realized, utilization efficiency of the producing water is improved, and treatment cost is reduced.

Description

technical field [0001] The invention relates to the technical field of sea salt production, in particular to a method for producing concentrated brine from sea salt. Background technique [0002] With the development of my country's seawater desalination industry, the treatment of concentrated seawater after desalination has become an urgent problem to be solved. The direct discharge of concentrated seawater will have a certain impact on marine organisms and the marine environment, especially for my country's inland Bohai Sea, where seawater exchange capacity is poor, and direct discharge of concentrated seawater into the sea will cause ecological pollution, which limits the development of seawater desalination industry in the Bohai Rim region. Further development. For the salt industry, it is facing the challenge of the depletion of underground brine resources and the shrinking of salt fields; the concentration of concentrated seawater is about twice that of seawater, which...

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Application Information

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IPC IPC(8): C02F9/02C02F103/08
CPCC02F1/001C02F1/441C02F1/442C02F1/444C02F9/00C02F2103/08C02F2301/04Y02A20/131
Inventor 吴桐刘雪芝李明明朱梁柴子华孙树声郭亮郝庆山郭有智杨彦
Owner 山东省盐业集团有限公司
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