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A brine refining device and method for directly removing calcium and magnesium

A brine refining, calcium and magnesium technology, applied in electrodialysis, alkali metal halide purification and other directions, can solve the problems of low efficiency, high cost, complicated process and so on

Active Publication Date: 2018-02-06
NANJING TECH UNIV
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  • Abstract
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Problems solved by technology

This water treatment process is cumbersome, inefficient and expensive

Method used

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  • A brine refining device and method for directly removing calcium and magnesium

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Embodiment Construction

[0015] The present invention is specifically described below by the embodiment, only for further illustrating the present invention, can not be interpreted as the limitation of protection scope of the present invention, the technical engineer of this field can make some non-essential improvements and improvements to the present invention according to the content of the above-mentioned invention Adjustment.

[0016] Such as figure 1 Shown, the brine refining method that the present invention proposes, to magnesium ion (Mg 2+ ), calcium ions (Ca 2+ ) and sodium ions (Na + ) for separation, the method mainly lies in the design of the separation membrane. Here, an enlarged view of the separation membrane is shown. As shown in the figure, the surface of the separation membrane 1 is micro-machined, and countless micro-channels 11 are etched (the channel size can be controlled between 10um and 100um, because the channel pressure is proportional to the -4th power of the pore diame...

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Abstract

The invention discloses a saline-water refining device and method capable of directly removing calcium and magnesium. The saline-water refining device comprises a separation film, wherein multiple micron channels in the same orientation are formed in the separation film, the diameters of the micron channels are 10-100 microns, a stock solution region communicated with inlet ends of the micron channels is arranged on one side of the separation film, and a separation region connected with outlet ends of the micron channels is arranged on the other side of the separation film; a section of anion exchange membrane is arranged on the inner wall of each micron channel, and the outer surfaces of the anion exchange membranes are communicated with inner cavities of the micron channels; and a first electrode is arranged on one side, opposite to the stock solution region, of the separation film, a second electrode is arranged on one side, opposite to the separation region, of the separation film, the first electrode and the second electrode are used for generating field intensity covering the field intensity directions of the micron channels from the separation region to the stock solution region, and third electrodes are arranged on the anion exchange membranes. The saline-water refining device has the advantages that only a hundred-micron-order aperture is required, and the operational pressure and the manufacturing difficulty are reduced, so that the separation cost is lowered, and the industry promotion is improved.

Description

technical field [0001] The invention belongs to the technical field of metal ion separation and treatment, and in particular relates to a brine refining device and method for directly removing calcium and magnesium. Background technique [0002] The main raw material for electrolytic chlor-alkali production is saturated brine solution. In the process of chlor-alkali production, whether sea salt, lake salt, rock salt or any raw material in brine is used, it contains inorganic impurities such as calcium and magnesium, as well as natural organic matter and organic impurities such as bacteria, algae residues, and humic acid. These impurities will be brought into the brine system during salt conversion, if not removed, it will cause damage to the membrane, thereby reducing its efficiency, destroying the normal production of the electrolytic cell, and greatly shortening the life of the membrane. Some impurities in the brine will produce side reactions in the electrolytic cell, re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/48C01D3/14
CPCC01D3/14
Inventor 朱育丹李子瑞陆小华阮洋
Owner NANJING TECH UNIV
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