The selective depression effect of sodium hexametaphosphate on the separation of chlorite and specularite
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1
State Key Laboratory of Safety and Health for Metal Mine, Maanshan 243071, China
 
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School of Metallurgy Engineering, Anhui University of Technology, Ma'anshan 243032, China.
 
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Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China
 
 
Publication date: 2023-05-25
 
 
Corresponding author
Mingyang Li   

School of Metallurgy Engineering, Anhui University of Technology, Ma'anshan 243032, China.
 
 
Physicochem. Probl. Miner. Process. 2023;59(2):166495
 
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ABSTRACT
Flotation is the most known beneficiation method for the separation of complex and refractory iron ores. As a typical iron-containing silicates, it is difficult to separate chlorite from specularite, because of the similar surface physicochemical properties. In this study, the selective depression effect of sodium hexametaphosphate (SHMP) was conducted via the cationic micro-flotation. The surface adsorption mechanism between SHMP and the two mineral surface was explored through surface adsorption amount tests, Zeta-potential measurements, Fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) analyses. The micro-flotation results indicated that SHMP could selectively depress around 90% of chlorite, while its effect on the floatability of specularite was negligible (<20% depressing). The surface adsorption amount tests, Zeta-potential measurements analysis demonstrated that SHMP selectively adsorb on chlorite surface while on the surface of specularite is feeble. The further surface adsorption analysis via FT-IR and XPS proved that SHMP selective adsorption occurred on the chlorite surface mainly by chemisorption mainly through the chelation reaction between O in the phosphate groups of SHMP molecular and metal ions on surface of chlorite.
eISSN:2084-4735
ISSN:1643-1049
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