Abstract
In the past coal maceral separation have been carried out based on density difference e. g., sink-float analysis, density gradient centrifugation (DGC) techniques etc. These approaches are of limited success. Froth flotation is a physico-chemical process separating particles on the basis of difference in surface properties in a vessel consisting of two distinct zones viz., pulp and froth zones. Rate of floatability of individual size range particles varies with their ash percent and the maceral content present. Therefore, the flotation rate constant eventually becomes a function of maceral percentage of a coal particle. In the present paper, an attempt has been made by performing size-wise flotation tests using a sub-bituminous rank coal and flotation kinetics have been established based on maceral percentage reporting to concentrate at different time intervals of flotation. These results have been related to the kinetic behaviour of the process.
Highlights
Coal macerals can be defined as the microscopically recognizable organic constituents having no definite crystal structure and chemical composition. These macerals are generally classified into three major maceral groups such as vitrinite, liptinite and inertinite
Several beneficiation techniques were adopted for the concentration of macerals such as froth flotation [2,3,4,5], magnetic separation [6] and electrostatic separation [7] etc
Hardgrove grindability index (HGI) is most directly related to the coal maceral composition but it depends on the rank of the coal
Summary
Coal macerals can be defined as the microscopically recognizable organic constituents having no definite crystal structure and chemical composition. Froth flotation is the physico-chemical process consists of three phases such as solid, water and air phases It consists of two different zones such as pulp zone and froth zone. In another study macerals are arranged with the rate of flotation such as liptinite > vitrinite > inertinite, with a typical value of 0.118sec-1, 0.113sec-1 and 0.112sec-1 respectively [12]. Honaker, separated the macerals by using column flotation technique In this study, they take the coal sample having size -50mm collected from Illinois no-6 seam having ash, sulfur, mineral matter, vitrinite, liptinite, inertinite, are 8.3%, 1.1%, 9.50%, 79.10%, 3.90%, and 7.50% respectively. The coal samples are taken from Jharkhand colliery, India, with the objective of determining possibilities of the separation of maceral groups in different size fractions of -500+150, -150+75, -75+36, -36+25 and -25 microns, and flotation rate constant is studied with size-fraction. Froth fractions were collected at cumulative time such as 5, 15, 30, 60, and 90 second
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