Comprehensive process method for salt production by seawater desalination

A technology of comprehensive process and process method, applied in the field of seawater treatment, can solve the problems of limited application range, low output rate, polluted surface water and groundwater, etc., and achieve the effect of saving land resources, improving utilization efficiency, and reducing the area of ​​tanning

Inactive Publication Date: 2018-04-20
山东省盐业集团有限公司
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Problems solved by technology

Direct discharge of concentrated seawater will have a certain impact on marine organisms and the marine environment, pollute surface water and groundwater, and increase the processing burden of sewage treatment plants
In terms of reuse, the method of tanning in salt fields is mainly used now, but with the economic development of coastal areas, the area of ​​brine making in salt fields is gradually shrinking, which limits its application range
[0004] For the salt industry, du

Method used

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  • Comprehensive process method for salt production by seawater desalination

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Embodiment 1

[0052] A seawater desalination plant with a reverse osmosis device has an inflow of 25,000 tons / day, an inflow concentration of 3.2°Bé, sodium ions 11g / L, calcium ions 0.4g / L, magnesium ions 1.2g / L, and sulfate ions 2.3g / L , chloride ion 18g / L, bromide ion 0.065g / L, after pretreatment, enter the reverse osmosis device (1), the recovery rate is 40%, the water production is 10000 tons / day, and the water conductivity is 300μs·cm -1 Enter the secondary reverse osmosis to produce pure water; the volume of concentrated water is 15,000 tons / day, and the concentration of concentrated water is 4-5°Bé, of which sodium ions are 18.3g / L, calcium ions are 0.6-0.7g / L, and magnesium ions are 1.8-2.2g / L, sulfate ion 3.5~4.5g / L, chloride ion 29~31g / L, bromide ion 0.1g / L.

[0053] The concentrated seawater enters the bromine extraction device to extract bromine. The bromine concentration of the concentrated seawater is 0.1g / L, the pH value is controlled at 2.5-4, the chlorine distribution rate...

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Abstract

The invention provides a comprehensive process method for salt production by seawater desalination and belongs to the technical field of seawater treatment. The process method comprises the followingsteps: enabling pre-treated seawater to be subjected to reverse osmosis treatment, entering a nano-filtration device after reverse osmosis concentrated water is subjected to bromine extraction and pHregulation and is added with a reducing agent, performing salt production with nano-filtration concentrated water, and enabling concentrated water obtained by the treatment of nano-filtration producedwater with a high-pressure reverse osmosis device to enter an electrodialysis device so as to obtain strong brine and performing salt production with the strong brine through a mechanical steam recompression device. By utilizing a series of technologies such as nano-filtration, high-pressure reverse osmosis, electrodialysis, a mechanical steam recompression technology, a closed circulating loop is formed through dosage, concentration and graded reuse, and further, salt production, bromine extraction, magnesium extraction, mirabilite production and the like are performed, so that the comprehensive utilization of the seawater is realized.

Description

technical field [0001] The invention relates to the technical field of seawater treatment, in particular to a comprehensive process for seawater desalination and salt production. Background technique [0002] my country's water resources are in serious shortage, with low per capita fresh water and uneven temporal and spatial distribution. Desalination of seawater can provide fresh water resources stably without restriction. In recent years, with the advancement of technology, the cost of water production has been greatly reduced, and desalination of seawater in my country has developed rapidly. [0003] With the expansion of the scale of seawater desalination industry, the discharge of by-product concentrated seawater is an urgent problem to be solved in seawater desalination technology. At present, the commonly used concentrated brine treatment methods can be divided into two categories: the first category is direct discharge, such as discharge into the ocean, surface wate...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F103/08
CPCC02F1/001C02F1/22C02F1/441C02F1/442C02F1/4693C02F1/66C02F9/00C02F2103/08Y02A20/131
Inventor 孙树声柴子华吴桐李明明刘雪芝朱梁郭有智郝庆山郭亮杨彦
Owner 山东省盐业集团有限公司
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