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1. (WO2013123722) METHOD FOR CYCLICALLY PREPARING ELEMENTAL BORON AND SIMULTANEOUSLY PRODUCING POTASSIUM CRYOLITE USING POTASSIUM FLUOROBORATE AS AN INTERMEDIATE MATERIAL

Pub. No.:    WO/2013/123722    International Application No.:    PCT/CN2012/074949
Publication Date: Fri Aug 30 01:59:59 CEST 2013 International Filing Date: Mon Apr 30 01:59:59 CEST 2012
IPC: C01B 35/02
C01F 7/54
Applicants: SHENZHEN SUNXING LIGHT ALLOYS MATERIALS CO., LTD
深圳市新星轻合金材料股份有限公司
CHEN, Xuemin
陈学敏
YANG, Jun
杨军
ZHOU, Zhi
周志
YU, Yueming
余跃明
YE, Qingdong
叶清东
Inventors: CHEN, Xuemin
陈学敏
YANG, Jun
杨军
ZHOU, Zhi
周志
YU, Yueming
余跃明
YE, Qingdong
叶清东
Title: METHOD FOR CYCLICALLY PREPARING ELEMENTAL BORON AND SIMULTANEOUSLY PRODUCING POTASSIUM CRYOLITE USING POTASSIUM FLUOROBORATE AS AN INTERMEDIATE MATERIAL
Abstract:
Disclosed is a method for cyclically preparing elemental boron and simultaneously producing potassium cryolite using potassium fluoroborate as an intermediate material, comprising the steps: A) adding hydrofluoric acid to boric acid or boric anhydride to obtain by reaction fluoroboric acid; B) adding a potassium sulfate aqueous solution to the fluoroboric acid to obtain by reaction potassium fluoroborate; C) introducing the potassium fluoroborate into a reactor and then adding aluminum to obtain by reaction elemental boron and potassium cryolite; alternatively, introducing the aluminum into the reactor and then adding potassium fluoroborate to obtain by reaction elemental boron and potassium cryolite; D) extracting the potassium cryolite and feeding same, along with concentrated sulfuric acid, into a rotary reaction kettle to obtain by reaction hydrogen fluoride gas, aluminum potassium sulfate, and potassium sulfate, collecting the hydrogen fluoride gas and dissolving same in water to obtain hydrofluoric acid; E) recycling the obtained hydrofluoric acid to step A to be used to leach boric acid or boric anhydride. The present invention recycles the by-product potassium cryolite, shortening the elemental boron preparation process, lowering the overall costs of production, raising production efficiency, and reducing environmental pollution.