期刊论文详细信息
Minerals
Study on the Activation of Scheelite and Wolframite by Lead Nitrate
Gang Zhao2  Shuai Wang1  Hong Zhong1 
[1] College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, China; E-Mail
关键词: flotation;    scheelite;    wolframite;    activation;    lead nitrate;    DFT;   
DOI  :  10.3390/min5020247
来源: mdpi
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【 摘 要 】

The activation of scheelite and wolframite by lead nitrate with benzohydroxamic acid (BHA) as collector was investigated by means of micro flotation test, zeta potential measurement, X-ray photoelectron spectroscopy (XPS) analyses and density functional theory (DFT) calculation. The flotation results confirmed that the addition of lead nitrate can markedly enhance the recovery of scheelite and wolframite. In the zeta potential curves obvious positive shifts were observed with the presence of lead nitrate. Lead was detected on mineral surface in microscopic analysis and the survey XP spectra. Both the electrokinetic study and XPS analyses indicated that lead ion can be adsorbed onto mineral surface. In DFT calculation, the coordination model of BHA with metal hydroxyl ions (Ca(OH)+, Mn(OH)+, Fe(OH)+ and Pb(OH)+) was simulated and their binding energy were also calculated. The calculated results revealed that the binding ability of BHA and Pb(OH)+ is the strongest, indicating that BHA can preferentially coordinate with Pb ion compared with Ca, Mn and Fe ions.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.

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