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Method for removing silicon and aluminum through one-time refining of ionic membrane caustic soda brine

An ionic membrane caustic soda and brine technology, which is applied in the purification of alkali metal halides, electrolysis process, electrolysis components, etc., can solve the problems of shortening the service life of ion exchange membranes, and achieve the effect of improving the diversity of impurity removal and improving the elasticity

Active Publication Date: 2021-12-17
ZHEJIANG OCEANKING DEVELOPMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to improve the problem that silicon-aluminum ions in refined brine tend to shorten the service life of ion exchange membranes, this application provides a method for removing silicon-aluminum by one-time refining of ion-exchange membrane caustic soda brine

Method used

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  • Method for removing silicon and aluminum through one-time refining of ionic membrane caustic soda brine
  • Method for removing silicon and aluminum through one-time refining of ionic membrane caustic soda brine

Examples

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Embodiment 1

[0051] A method for one-time refining of ion-exchange membrane caustic soda brine to remove silicon and aluminum, which sequentially includes an acidic air flotation method for removing silicon and a neutral precipitation method for removing aluminum;

[0052] Among them, the acid flotation silicon removal process includes the following steps:

[0053] (1) Mix 1L brine, 2mg sodium dodecylsulfonate and 10mg dodecylsulfonic acid to obtain pretreated brine;

[0054] (2) adding carbon dioxide gas in the form of bubbling into the pretreated brine, and driving the colloidal silicon to be trapped on the foam phase at a pH range between 5.0-6.0, to obtain preliminary desiliconized brine;

[0055] (3) Pass the preliminary desiliconized brine into the filter for filtration, then remove the dodecylsulfonate, dodecylsulfonic acid and carbonate in the siliconized brine through a perfluorosulfonic acid membrane, and finally obtain the refined desilicate brine Silicate;

[0056] The alumin...

Embodiment 2

[0061] The difference from Example 1 is that in (1), the added amount of sodium dodecylsulfonate is 4 mg, and the added amount of dodecylsulfonic acid is 20 mg.

Embodiment 3

[0063] The difference from Example 1 is that in (1), the added amount of sodium dodecylsulfonate is 6 mg, and the added amount of dodecylsulfonic acid is 30 mg.

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Abstract

The invention relates to the technical field of caustic soda preparation processes, in particular to a method for removing silicon and aluminum through one-time refining of ionic membrane caustic soda brine. The invention discloses a method for removing silicon and aluminum through one-time refining of ionic membrane caustic soda brine. The method comprises an acid air flotation method silicon removal process and a neutral precipitation method aluminum removal process. The acid gas flotation method silicon removal process comprises the following steps: (1) adding a foaming agent and a silicon ion trapping agent; (2) adding a gas auxiliary agent; (3) filtering through a nanofiltration membrane; the neutral precipitation method aluminum removal process comprises the following steps: S1, adding a sodium hydroxide solution; and S2, filtering in a filter. The method has the advantage that silicon and aluminum ions in the saline water can be removed.

Description

technical field [0001] The application relates to the technical field of caustic soda preparation process, more specifically, it relates to a method for removing silicon and aluminum by primary refining of ion membrane caustic soda brine. Background technique [0002] Ionic membrane caustic soda is caustic soda made by electrolyzing brine with ion exchange membrane method. The main principle is to firstly electrolyze the brine in the anode chamber to obtain Na + , Cl - , OH - and H + , the pure water in the cathode chamber is electrolyzed to obtain OH - and H + ; then through the selective permeability of the cation exchange membrane, the Na in the anode chamber + and H + transferred to the cathode chamber, and finally, the H in the cathode chamber + gradually generate H at the cathode 2 And volatilize, while the Na in the cathode chamber + with OH - Combine with each other and form NaOH. [0003] However, ionic membrane caustic soda has strict requirements on imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14C25B1/16
CPCC01D3/14C25B1/16
Inventor 周文斌沈曙光叶阳阳张远张翼任科恩卢学锋
Owner ZHEJIANG OCEANKING DEVELOPMENT CO LTD