Results 251 to 260 of about 6,379 (303)

Desulfurization of coal by microbial column flotation

Biotechnology and Bioengineering, 1994
AbstractTwenty‐three strains capable of oxidizing iron were isolated from coal and ore storage sites as well as coal and ore mines, volcanic areas, and hot spring. Four strains were found to have high iron‐oxidizing activity. One strain (T‐4) was selected for this experiment since the strain showed the fastest leaching rate of iron and sulfate from ...
N, Ohmura, H, Saiki
openaire   +2 more sources

Effect of column height on flotation column performance

Mining, Metallurgy & Exploration, 1988
The question is posed as to why columns typically have a collection zone 10 m high (H) by 1 m in diameter (D). Three geometry dependent factors are considered: degree of mixing, Np; volumetric bias rate, B; and volumetric gas rate, G. Increasing H:D decreased Np and B, which improves performance but decreases G, which causes the column to approach ...
J. B. Yianatos, R. Espinosa-Gomez, J. A. Finch, A. B. Laplante, G. S. Dobby   +4 more
openaire   +1 more source

Bubble spargers in column flotation: Adaptation to precipitate flotation

Minerals Engineering, 2000
Abstract The limiting factor for metal-organic precipitate flotation in a column is the level of aggregate stability under the turbulence created by the rising bubbles. The hydrodynamic conditions in a 75 mm diameter pilot column were optimised by using different bubble spargers (Microcel, Flotaire, Imox) and by varying the gas flow rate into the ...
L.O. Filippov, R. Joussemet, R. Houot
openaire   +1 more source

An investigation of the flotation mechanism in the aerosol column flotation machine

Russian Journal of Non-Ferrous Metals, 2009
It is shown that the induction time decreases as the temperature decreases if there is air bubble adhesion to hydrophobic and hydrophilic particles; if there isn’t, the time decreases where hydrophobic particles stick to one another and increases in the case of adhesion of hydrophilic particles.
S. I. Evdokimov, A. M. Pan’shin
openaire   +1 more source

Semi-batch flotation column

Minerals Engineering, 2012
Abstract A compact (75 cm ht × 7 cm dia.) semi-batch type flotation column was developed for use as a convenient testing and research apparatus especially in laboratories that do not have sufficient headroom for a full-size experimental column installation.
L.P. Gu, T. Yalcin
openaire   +1 more source

Flow characterization of a flotation column

The Canadian Journal of Chemical Engineering, 1989
AbstractThe flow characteristics of a froth flotation column have been experimentally studied using air and aqueous surfactant solutions without the presence of solids. The hold‐up behaviours of the bubbly and the froth zones of the column were linked together using the drift‐flux model.
Rajinder Pal, Jacob Masliyah
openaire   +1 more source

Developments in the control of flotation columns

International Journal of Mineral Processing, 1988
Abstract The methods used currently for the control of flotation columns are summarised. The major deficiency of these methods is that they rely on inaccurate and indirect measurements of slurry-froth interface level and bias flowrate (the net downward flowrate of water through the froth phase).
M.H. Moys, J.A. Finch
openaire   +1 more source

Arsenopyrite enrichment by column flotation

Minerals Engineering, 1993
Abstract Arsenic-rich, gold-bearing pyrite concentrates may be further enriched in arsenic to assist subsequent Au beneficiation. Among several amines tested in refloating a local Chalkidiki pyrite concentrate, 2-coco 2-methyl ammonium chloride proved successful by raising the grade from 9% to 22%, although total solids recovery was low. The use of a
P. Mavros, K.A. Kydros, K.A. Matis
openaire   +1 more source

Carrying capacity in flotation columns

Minerals Engineering, 1996
The equation proposed by Espinosa-Gomez et. al. for the carrying capacity in flotation columns is revised to give better fit to the data. Flotation columns are found to be normally operated around 60% of their maximum carrying capacities.
openaire   +1 more source

Control alternatives for flotation columns

Minerals Engineering, 1993
Abstract The optimisation of flotation column operation relies mostly on the identification of the key variables to be controlled, how accurately they can be measured and how coordinately they can be dynamically influenced. Even though substantial efforts have been made during the last years, there is still a lack of process knowledge, which ...
L.G. Bergh, J.B. Yianatos
openaire   +1 more source