METHOD FOR SYNCHRONOUSLY REMOVING FLUORINE, CHLORINE AND IRON IN SOLUTION

WIPO Patent Application WO/2023/221907

A1

Disclosed is a method for synchronously removing fluorine, chlorine and iron in a solution, comprising: continuously introducing gas containing a strong oxidizing gas into a solution containing Fe2+, F- and Cl-, at the same time adding a catalyst, adding a neutralizer to control the pH value to be 1.5-4.2, undergoing a reaction under shear enhancement, and performing solid-liquid separation to obtain a purified solution and iron-removed slag. In the present invention, chlorine ions are catalyzed by the catalyst to react with the strong oxidizing gas to form chlorine, in the presence of the metal mineral type catalyst, a seed crystal does not need to be introduced, only the pH value is controlled, and shear enhancement is performed, so that iron-removed slag mainly in a goethite crystalline form having a small particle size can be efficiently generated, such that more fluorine ions are adsorbed, and thus efficient adsorptive fluorine removal is achieved. Therefore, by means of the method of the present invention, fluorine, chlorine and iron can be synchronously and efficiently removed. According to the present invention, fluorine, chlorine and iron can be removed from the solution in one step, and the method is an efficient, clean and energy-saving purification process.

YANG JIANGUANG (CN)
NAN TIANXIANG (CN)
ZHANG YAN (CN)
HU QINGCHENG (CN)
TANG CHAOBO (CN)
ZENG WEIZHI (CN)
LONG WEI (CN)

PCT/CN2023/094114

November 23, 2023

May 15, 2023

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UNIV CENTRAL SOUTH (CN)

C22B3/44; C22B19/20; C22B23/00

CN114892003A	2022-08-12
CN106381388A	2017-02-08
CN110339805A	2019-10-18
CN111961851A	2020-11-20
CN114058847A	2022-02-18
JP2002028446A	2002-01-29
JP2008196039A	2008-08-28

CHANGSHA RONG ZHI PATENT AGENCY (CN)

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