Hydrogen bubble flotation of silica

In this study the flotation recovery of silica using air, and molecular and electrolytically-generated hydrogen was investigated. For comparison of air and molecular hydrogen recoveries, a laboratory Denver, type D12, flotation machine was used. For both gases, pH of the suspension, gas flow rate, c...

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Veröffentlicht in:Advanced powder technology : the international journal of the Society of Powder Technology, Japan Japan, 2010-07, Vol.21 (4), p.412-418
Hauptverfasser: Sarkar, Md. Shahjahan Kaisar Alam, Donne, S.W., Evans, G.M.
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container_issue 4
container_start_page 412
container_title Advanced powder technology : the international journal of the Society of Powder Technology, Japan
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creator Sarkar, Md. Shahjahan Kaisar Alam
Donne, S.W.
Evans, G.M.
description In this study the flotation recovery of silica using air, and molecular and electrolytically-generated hydrogen was investigated. For comparison of air and molecular hydrogen recoveries, a laboratory Denver, type D12, flotation machine was used. For both gases, pH of the suspension, gas flow rate, concentration of collector and frother, solids concentration, particle size and speed of impeller were kept constant. Almost identical recoveries were obtained for both gases, suggesting that gas composition played no significant role in silica flotation. Electroflotation experiments were carried out using 12.6 μm mean diameter silica particles. While fine particles had very poor recovery in the Denver cell, greater than 70% recoveries were achieved in the electroflotation cell. This was thought to be the result of the very small (less than 40 μm) bubbles generated by the electroflotation process. A population-balance model, incorporating the hydrogen generation process, supported the conclusion that increased recovery for electroflotation, for very fine silica particles at least, was attributed to the reduced bubble size and not by the composition of the gas.
doi_str_mv 10.1016/j.apt.2010.04.005
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subjects Bubble diameter
Bubbles
Concentration (composition)
Denver
Electroflotation
Electrolytic cells
Flotation
Hydrogen
Powder technology
Recovery
Silica
Silicon dioxide
title Hydrogen bubble flotation of silica
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