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Effect of depressants on flotation separation of magnesite from dolomite and calcite

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The flotation separation of magnesite from calcium-containing minerals has always been a difficult sub-ject in minerals processing.This work studied the inhibition effects of carboxymethyl cellulose(CMC),sodium lignosulphonate,polyaspartic acid(PASP)and sodium silicate on flotation behaviors of magne-site,dolomite and calcite,providing guidance for the development of reagents in magnesite flotation.The micro-flotation results showed that among these four depressants,sodium silicate presented the strongest selectivity due to the highest recovery difference,and the flotation separation of magnesite from dolomite and calcite could be achieved by using sodium silicate as the depressant.Contact angle measurement indicated that the addition of sodium silicate caused the largest differences in surface wet-tability of the three minerals,which was in line with micro-flotation tests.Furthermore,zeta potential test,the Fourier transform infrared(FT-IR)spectroscopy and atomic force microscope(AFM)imaging were used to reveal the inhibition mechanism of sodium silicate.The results indicated that the domi-nated component SiO(OH)3-of sodium silicate could adsorb on minerals surfaces,and the adsorption of sodium silicate hardly affected the adsorption of NaOL on magnesite surface,but caused the reduction of NaOL adsorption on dolomite and calcite surfaces,thereby increasing the flotation selectivity.

Sodium silicateMagnesiteDolomiteCalciteFlotation separationInhibition

Wenqing Qin、Junjie Hu、Hailing Zhu、Fen Jiao、Wenhao Jia、Junwei Han、Chen Chen

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School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China

Youth Science Foundation of ChinaKey Laboratory of Hunan Province for Clean and Efficiency Utilization of Strategic Calciumcontaining Mineral Resources

520043332018TP1002

2023

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCD北大核心EI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2023.33(1)
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