Journal Article•
A correlation between water content in froth and flotation results of hard coals
TL;DR: In this paper, the influence of solids concentration in the pulp and flotation time on water contents in froth and coal yields was studied, and it was found that there is a correlation between water content in the froth products and the concentrate yields.
Abstract: Properties of the froth layer formed in a flotation machine can affect significantly the results of coal flotation. Froth is a product of flotation where concentration of particles of a useful component occurs. Water enters into the froth layer by surrounding both the bubbles and particles attached to the bubbles. Water content in the flotation froth is an important parameter because it affects significantly both the additional separation, taking place in the froth layer, and the amount of aqueous solution removed together with the collected particles. Therefore, the flotation froths should have a definite stability and water contents. Too much water in the froth layer removed from the flotation machine together with the collected concentrate is disadvantageous because it is an additional load for further processing operations, for example filtration. Moreover, it means also that solution and flotation reagents needed for the flotation process are being removed from the system. A low solution content in froth is unfavorable for the supplementary segregation process. The paper aims at finding a correlation between the coal flotation and water contents in the froth products. The influence of solids concentration in the pulp and flotation time on water contents in froth and coal yields was studied. Flotation tests of coal samples obtained from a jig concentrate were carried out in ca. 1 dm3 laboratory Denver type flotation machine. The coal samples used in the studies were the jig concentrate of hard coal fines obtained from the industrial processing plant. Low ash contents and good floatability were the characteristic features of the coal used. The influence of the solids content in the pulp and flotation time on yield of the coal concentrate and water recovery in the froth products was studied. It was observed that liquid contents in froth were proportional to the pulp volume. Moreover, it was found that there is a correlation between water content in the froth products and the concentrate yields. Highest water recovery and yield of the coal concentrates were observed for the solids contents of 80 g/dm3 for all flotation times studied. 61
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01 Jan 2010
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TL;DR: A general introduction to foams, the initial stages in the production of foams in aqueous solution, foam structures and the classification of bulk foams according to their lifetimes and stability are presented in this paper.
601 citations
"A correlation between water content..." refers background in this paper
...Thus, the water contents in froth column are of great importance for selectivity of the flotation separation (Laskowski 1998; Leja 1982; Pugh 1996)....
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TL;DR: In this article, the effect of cell operating conditions including air rate and froth height on the degree of entrainment was examined on a size-by-size basis, and it was found that there is a strong correlation between the entraining and the water recovery, which is close to lineal for the fines.
144 citations
"A correlation between water content..." refers background in this paper
...The degree of entrainment increases with water contents in froth and decreases with increase in grains size (Zheng et al. 2006)....
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TL;DR: In this paper, local velocities, size and deformation of bubble were measured in distilled water and solutions of n -butanol, n -hexanol and n -nonanol as a function of distance from capillary at which the bubbles were formed.
81 citations
Book•
01 Jan 1998
TL;DR: In this article, the effect of Particle and Bubble Size on Flotation Kinetics is discussed. And the relationship between Flotation Variables and Froth Appearance is analyzed using Froth Imaging Data.
Abstract: 1. Frothers and Frothing 2. Effect of Particle and Bubble Size on Flotation Kinetics 3. Mechanisms Operating in Flotation Froths 4. Characterization of Flotation Froth 5. Modelling of Froth Dynamics with Implications for Feed-Back Control 6. The Interrelationship Between Flotation Variables and Froth Appearance 7. Froth Image Analysis in a Flotation Control System 8. Kinetic Flotation Modelling Using Froth Imaging Data 9. Dependence of Froth Behavior on Galvanic Interactions 10. Water Content and Distribution in Flotation Froths 11. Simultaneous Determination of Collection Zone Rate Constant and Froth Zone Recovery Factor
77 citations
TL;DR: In this paper, the authors measured the acceleration and shape deformation of bubbles in solutions of n-trimethylammonium bromide, n-octyl-β-d-glucopyranoside and n-Octanoic acid.
53 citations
"A correlation between water content..." refers background in this paper
...Moreover, a dynamic adsorption layer formed by frothers molecules adsorbed over surface of the floating bubble cause a lowering the bubble velocity (Krzan et al. 2002, 2004)....
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