Influence of controlled dispersion on rheology of swelling clay suspensions in the presence of coal flotation reagents
Wei Yu 1
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School of Environmental Science & Spatial Informatics, China University of Mining & Technology
National Engineering Research Centre of Coal Preparation and Purification, China University of Mining & Technology
Publication date: 2017-05-14
Corresponding author
Mingqing Zhang   

School of Environmental Science & Spatial Informatics, China University of Mining & Technology
Physicochem. Probl. Miner. Process. 2017;53(2):1148-1160
Swelling clay minerals, which are innately capable of dispersing into thin flakes in water, can significantly depress coal flotation. Some researchers partially attribute depression to pulp viscosity increments. This study sought to understand the role of swelling clay minerals in fine coal flotation, by investigating the rheological behavior of bentonite suspensions under controlled and uncontrolled dispersion conditions. The effect of collector, frother, and solution pH on rheological properties of the pulp was studied. Findings showed that at a natural pH, Newtonian flow properties were displayed when bentonite was directly added into a swelling suppressed solution containing calcium ions. The same process was repeated under uncontrolled conditions, and the suspensions transferred from Newtonian to non-Newtonian flows with pseudo-plastic characteristics, depending on the solid density. Further, pH value, methyl isobutyl carbinol (MIBC) and kerosene had the potential to alter the rheological behavior of controlled and uncontrolled systems, especially pH value in the uncontrolled system.
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