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Minerals 2018, 8(4), 122; doi:10.3390/min8040122

Influence of Particle Size in Talc Suppression by a Galactomannan Depressant

1
School of Minerals Processing and Bio-Engineering, Central South University, Changsha 410083, China
2
School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, China
*
Authors to whom correspondence should be addressed.
Received: 28 January 2018 / Revised: 14 March 2018 / Accepted: 16 March 2018 / Published: 21 March 2018
(This article belongs to the Special Issue Flotation Chemistry)
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Abstract

Flotation behavior of different sizes of particles may follow different trends. The influence of particle size in talc suppression by a depressant galactomannan was studied in this research. The flotation response and mechanism were examined by flotation tests, modified flotation rate constant and entrainment recovery calculation, laser particle size experiments, adsorption tests, and advancing contact angle measurement as well as scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDS). The maximum recovery increased with particle size increases in the absence of galactomannan FPY (Fenugreek polysaccharide). The obviously suppressed effect was observed for the size fraction of −74 + 38 μm after reacting with FPY, but low efficiency was received for −38 μm and −10 μm, respectively. Laser particle size analysis indicated that the FPY has a certain function for the flocculation of fine particles. It is beneficial for reducing recovery by entrainment. EDS and advancing contact angle test results showed that the difference in contact angles probably is a result of genuine differences in the quantity of O and Mg bearing surface species, while the contact angle varied with particle size fraction in the absence of FPY. Adsorption and SEM test results demonstrated that in the case of −74 + 38 μm, the depressant adsorption density on the mineral surface is higher than the other two size fractions. On the whole, FPY probably is not enough of a depressant for talc suppression. View Full-Text
Keywords: size fraction; depressant galactomannan; entrainment; advancing contact angle; talc flotation size fraction; depressant galactomannan; entrainment; advancing contact angle; talc flotation
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Chen, Z.; Gu, G.; Li, S.; Song, S.; Wang, C. Influence of Particle Size in Talc Suppression by a Galactomannan Depressant. Minerals 2018, 8, 122.

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