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Separation of Pyrite from Coal 40 Wet oxidation pretreatment 41 Ultrasonic vibration 44 Chemical comminution 46 Microbubble flotation 48 Kinetics of Coal Flotation 51 EXPERIMENTAL CONDITIONS 54 Experimental Apparatus and Procedures 54 Froth flotation test 54 Chemical pretreatment step 56 Microbubble flotation test 58 Other equipment 60
The characteristic separation performance achievable from the treatment of fine coal using a froth flotation process is commonly estimated using either the release or tree analysis procedure.
The amount and quality of concentrate obtained from froth flotation of a coal are very important to determine the efficiency of the separation process. The shape and size of the bubbles in the froth directly affect the amount and purity of the concentrate overflowed during the froth flotation of the coal. The froth structure is significantly dependent on parameters such as the size of the
#0183;#32;1. Introduction. Conventional froth flotation for fine coal cleaning suffers mainly from two problems: (i) a lack of selectivity for fast floating high rank coals due to the flotation of middlings and entrainment of mineral fines in the froth, and (ii) low recoveries for heavily oxidized or low rank coals due to poor adhesion between bubbles and particles.
Coal cleaning by froth flotation Separation of Pyrite from Coal 40 Wet oxidation pretreatment 41 Ultrasonic vibration 44 Chemical comminution 46 Microbubble flotation 48 Kinetics of Coal Flotation 51 EXPERIMENTAL CONDITIONS 54 Experimental Apparatus and Procedures 54 Froth flotation test 54 Chemical pretreatment step 56 Microbubble flotation test 58 Other equipment 60
Key words: flotation, coal, froth separation 1 INTRODUCTION Black coal is an important raw material not only for the power engineering, but also for the metallurgical and chemical industries. With the increased mechanization in the mining industry, an increase in yield of finegrained fractions occur that need to be further treated.
#0183;#32;In the past coal maceral separation have been carried out based on density difference e. g., sinkfloat analysis, density gradient centrifugation (DGC) techniques etc. These approaches are of limited success. Froth flotation is a physicochemical process separating particles on the basis of difference in surface properties in a vessel consisting of two distinct zones viz., pulp and froth zones.
as froth flotation [25], magnetic separation [6] and electrostatic separation [7] etc.,. Except froth flotation technique, none of the other techniques gained any acceptance due to techno
Coal Froth Flotation: Coal flotation is a separation process performed mainly based on differences in surface hydrophobicity between coal and gangue. The flotation reagent can improve the hydrophobicity of coal, and also the adhesion between coal and air bubbles.
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