Impact of acid surface pretreatment on the flotation of ilmenite and titanaugite and its functional mechanism

The effect of acid surface pretreatment on the flotation behaviors of ilmenite and titanaugite was investigated with BHA collector and Pb2+ activator. The flotation recovery of ilmenite improved from 62.56% to 84.68% at pH 8.0 after pretreated with H2SO4 solution, while that of titanaugite decreased...

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Bibliographic Details
Published in:Powder technology 2020-10, Vol.376, p.622-630
Main Authors: Du, Yusheng, Meng, Qingyou, Yuan, Zhitao, Zhao, Xuan, Xu, Yuankai
Format: Article
Language:English
Subjects:
Acid surface pretreatment
Acids
Active sites
Calcium
Flotation
Ilmenite
Iron
Lead
Magnesium
Pretreatment
Sulfuric acid
Surface pretreatments
Titanaugite
Titanium
X ray photoelectron spectroscopy
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Summary:The effect of acid surface pretreatment on the flotation behaviors of ilmenite and titanaugite was investigated with BHA collector and Pb2+ activator. The flotation recovery of ilmenite improved from 62.56% to 84.68% at pH 8.0 after pretreated with H2SO4 solution, while that of titanaugite decreased from 35.73% to 0.54%. The results of SEM and ICP analysis showed that the dissolution of Fe, Ca, and Mg elements on titanaugite surfaces was greater than those of ilmenite in the acid solution, especially Fe element. XPS analysis indicated that after the acid surface pretreatment, Ti became a new active site reacted with BHA and the main active sites for ilmenite changed from Fe, Mg, and Ca to Ti and Fe, while the Fe active site disappeared for titanaugite. These changes in the active sites increased the floatability of ilmenite and reduced the floatability of titanaugite. [Display omitted] •Acid surface pretreatment enhanced the floatability of ilmenite.•Acid surface pretreatment decreased the floatability of titanaugite.•Fe, Ca, and Mg dissolved from titanaugite surfaces were greater than those of ilmenite.•Ti and Fe became active sites in ilmenite flotation after the acid surface pretreatment.•Fe active site for titanaugite disappeared after the acid surface pretreatment.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2020.08.057