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A method and device for producing salt from seawater

A seawater and brine technology, which is applied in the fields of salt production and seawater desalination, can solve problems such as the bad influence of the surrounding environment of seawater and the imbalance of seawater ecological environment, and achieve the effect of realizing reuse and increasing the degree of brine

Inactive Publication Date: 2016-05-04
青岛盐邦创投集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current common operation is to directly discharge a large amount of concentrated brine (brine) into the sea; if things go on like this, the ecological environment of seawater will be seriously unbalanced, and it will also have a bad impact on the surrounding sea area and the environment around the seawater

Method used

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  • A method and device for producing salt from seawater
  • A method and device for producing salt from seawater
  • A method and device for producing salt from seawater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Please refer to figure 1 The method for producing salt from seawater provided by the embodiments of the present invention comprises the following steps:

[0057] Step 101: filtering seawater to obtain filtered seawater;

[0058] In this step, by filtering, the suspended solids contained in the seawater and the large particle size impurities (greater than 5 microns) are removed, thereby ensuring the cleanliness of the filtered seawater, and further overcoming the problem of the seawater in the nanofiltration process. Potential danger of damage to the nanofiltration membrane caused by large particle size impurities.

[0059] Step 102: heat-exchanging the filtered seawater until its temperature reaches 25°C, and then performing nanofiltration treatment to obtain concentrated brine and fresh water;

[0060] Generally speaking, in the process of nanofiltration treatment, when the temperature of the filtered seawater is 20-22°C, the nanofiltration effect is the best; moreov...

Embodiment 2

[0071] The method for producing salt from seawater provided by the embodiment of the present invention includes the following steps, please refer to figure 2 :

[0072] S21: After adding bactericide and flocculant to seawater, perform quartz sand filtration, activated carbon filtration and security filtration to obtain filtered seawater;

[0073] A fungicide is added to the seawater to kill harmful microorganisms in the seawater and ensure the safety of the subsequent fresh water and salt production process. The flocculants added mainly include inorganic flocculants, organic flocculants, microbial flocculants and composite flocculants. Among them, among the inorganic flocculants, aluminum salts and iron salts are the most widely used; while among the organic flocculants, poly(phenylene amide) is the most commonly used. The turbidity and chemical oxygen demand are reduced, and the suspended solids can be filtered out after flocculation. In this application, preferably, the ...

Embodiment 3

[0088] Example 3

[0089] The device for realizing the method of using seawater to produce salt provided by the embodiment of the present invention includes a primary filter device, a ground source heat pump, a nanofiltration device, bromine extraction equipment, and an MVR evaporator;

[0090] Among them, the primary filtering device: used to filter seawater to obtain filtered seawater; ground source heat pump: used to exchange heat for the filtered seawater and make the temperature reach 20-35°C; nanofiltration device: used for The filtered seawater after heat exchange is subjected to nanofiltration treatment, and concentrated brine and fresh water are obtained; bromine extraction equipment: used to separate bromine in concentrated brine, and to obtain secondary concentrated brine; MVR evaporator is used to extract saturated brine The fresh water in the brine is separated, and fresh water and industrial salt are obtained.

[0091] Preferably, in order to make the filtering ...

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Abstract

The invention provides a method and a device for making salt by using seawater and relates to the field of seawater desalination and salt making. The method comprises the following steps: filtering the seawater to obtain filtered seawater; exchanging heat of the filtered seawater to make sure that the temperature of the filtered seawater is 20 to 35 DEG C and then performing nanofiltration treatment to obtain concentrated brine and fresh water; delivering the concentrated brine to a bromine plant to extract bromine to obtain secondary concentrated brine; evaporating the secondary concentrated brine in the sun to obtain saturated brine and crude salt; treating the saturated brine by means of vacuum salt production to obtain the fresh water and industrial salt. According to the method provided by the invention, the seawater (or semi-finished brine) is taken as a source, and finished products such as the fresh water, the crude salt, the industrial salt, calcium chloride, magnesium sulfate and the like are separated from the seawater, so that reutilization of the concentrated brine is realized, and the defect that bad influences are caused to marine ecology due to direct emission of the concentrated brine in the sea is overcome.

Description

technical field [0001] The invention relates to the field of seawater desalination and salt production, in particular to a method and device for producing salt by using seawater. Background technique [0002] Freshwater refers to water with a salt content less than 500mg / L. Freshwater resources refer to groundwater, lake freshwater and riverbed water. The sum of the three accounts for about 0.77% of the total water on the earth. The total amount of water on the earth is 1.4 billion cubic kilometers, and the fresh water reserves account for only 2.53% of the total global water, and 68.7% of them belong to solid glaciers, which are distributed in the hard-to-use high mountains and the southern and northern poles. Fresh water is buried very deep underground, making it difficult to extract and utilize it. [0003] However, with the depletion of fresh water resources and the intensification of pollution of fresh water resources by various industries, the fresh water resources th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/02C02F9/04C01D3/06C01F11/24C01F5/40
CPCY02P20/129
Inventor 王博
Owner 青岛盐邦创投集团有限公司
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