Quantitative analysis of surface adsorption reactivity during flotation process by surface complexation model: diaspore and kaolinite

被引：9

作者：

Gao, Ya ^{[1
]}

Fu, Xinzhuang ^{[1
]}

Yue, Tong ^{[1
]}

Han, Haisheng ^{[1
]}

Gao, Zhiyong ^{[1
]}

Wang, Li ^{[1
]}

Sun, Wei ^{[1
]}

机构：

[1] Cent South Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Peoples R China

来源：

MINERALS ENGINEERING | 2022年 / 183卷

基金：

中国国家自然科学基金;

关键词：

Surface complexation model; Sodium oleate; Diaspore and kaolinite; Adsorption; Flotation; CHARGE-DISTRIBUTION; REVERSE FLOTATION; OXIDE; ACID; MONTMORILLONITE; SEPARATION; INTERFACE; CHEMISTRY; COLLECTOR; HEMATITE;

D O I：

10.1016/j.mineng.2022.107623

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The considerable discrepancy of reagent adsorption is definitely a prerequisite to separate different minerals in flotation, making it necessary to quantify and analyze adsorption reaction with surface sites. In present study, it is the first attempt to quantitatively describe complexation adsorption of sodium oleate (NaOL) on diaspore and kaolinite surfaces through surface complexation model (SCM) theory. The high precision potentiometric titration was conducted to clarify hydration process of active sites on mineral surfaces. Furthermore, NaOL adsorption with great precision and stability was implemented by GCMS method. For diaspore, logarithmic protonation constants for =AlOH2+ and =AlO- are 5.308 and - 8.701, respectively, while =AlOH density is 7.956 sites/nm2. For kaolinite, 5.601, -9.405, -1.1, -7.725, 3.899 are output as the corresponding values of =AlOH2+, =AlO-, =SiOH2+, =SiO-, =XH. The site ratio on edge and basal planes (=SOH: =X-) was 1.07: 1. NaOL adsorption equilibrium constants were 13.55 for =AlOL onto diaspore and 11.76 and 10.35 for =AlOL and =SiOL onto kaolinite. Finally, all the obtained results were successfully verified and predicted. It not only reflects the chemical characteristic of hydration and adsorption for mineral sites, but also provides the theoretical guidance and foundation for flotation optimization and database construction.

引用

页数：11

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