Extracting and zero-discharging method of seawater bittern multi-elements

A zero-emission, multi-element technology, applied in chemical instruments and methods, heavy water, magnesium halide, etc., can solve the problems of zero discharge of seawater bittern, waste of resources, poor economic benefits, etc., to reduce the pressure of sea salt production, Effect of avoiding marine pollution and protecting ecological balance

Active Publication Date: 2012-05-02
莱州诚源盐化有限公司
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Problems solved by technology

[0002] Various chemical elements in the by-product bittern during the salt making process are about 40 times more concentrated than seawater, which is an excellent raw material for extracting chemical elements in seawater, but limited by the technical level, the utilization rate of bittern is less than 20%. A large amount of bittern resources are discharged into the sea or circulated in salt pans, which not only causes a waste o

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  • Extracting and zero-discharging method of seawater bittern multi-elements

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Embodiment Construction

[0030] For further illustrating the present invention, specifically illustrate in conjunction with following examples:

[0031] combine figure 1 , the seawater bittern multi-element extraction and zero discharge method of the present invention comprises the following steps:

[0032] (1) The bittern of 28 degrees Baume is re-dried to obtain the bittern of more than 32 degrees Baume;

[0033] (2) the bittern obtained in the previous step is naturally frozen in the bittern storehouse, and the temperature is -5° C. to obtain the magnesium sulfate product;

[0034] (3) Calcium chloride is added in the bittern after the previous step processing, and calcium sulfate product is obtained after sedimentation and centrifugation;

[0035] (4) The bittern from which calcium sulfate is separated is subjected to four-effect evaporation, and the temperature of the termination boiling point is controlled to reach 112-115° C., and solid-liquid separation is carried out to obtain refined salt ...

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Abstract

The invention relates to an extracting and zero-discharging method of seawater bittern multi-elements. With the method, zero-discharging of seawater bittern can be realized, such that surrounding marine area ecological balance can be protected, and marine pollution can be avoided. Because economic benefits brought by traditional bittern utilization technologies are poor, the utilization rate of bittern is lower than 20%, and all of the rest of bittern is discharged into the sea. If the situation continues, marine environment will be polluted, and a variety of fishes will become extinct. With the method provided by the invention, energy can be saved with a high efficiency, cost can be saved, the bittern resource can be fully utilized, zero-discharging can be realized, bittern can be prevented from polluting the marine environment, and future sea salt production pressures on enterprises can be alleviated.

Description

technical field [0001] The invention relates to the comprehensive utilization technology of seawater bittern, in particular to a method for multi-element extraction and zero discharge of seawater bittern. Background technique [0002] Various chemical elements in the by-product bittern during the salt making process are about 40 times more concentrated than seawater, which is an excellent raw material for extracting chemical elements in seawater, but limited by the technical level, the utilization rate of bittern is less than 20%. A large number of bittern resources are discharged into the sea or circulated in salt pans, which not only causes a waste of resources but also affects the ecological balance of offshore waters. Realizing the thorough comprehensive utilization of bittern is an effective measure to solve the shortage of land resources, a necessary guarantee to realize energy saving and emission reduction in sea salt production, and it is also an urgent problem that ...

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Application Information

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IPC IPC(8): C01F5/40C01F11/46C01F5/30C01D3/06C01D15/08C01B35/10C01B7/09C01B7/03C01B5/02C01D5/00
Inventor 于波刘鸿领刘同强王维忠于皓
Owner 莱州诚源盐化有限公司
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