Flotation of oxidized coal using coal tar as a new collector

Yang, Zili; He, Qi; Chang, Guohui; Xia, Yangchao; Xing, Yaowen; Gui, Xiahui

doi:10.1080/15567036.2020.1819916

Cited by 4 publications

(2 citation statements)

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“…[ 30–32 ] Besides these pre‐treatments, some efficient surfactants and promoters have a substantial role in the flotation response of low rank/oxidized coal. [ 33,34 ]…”

Section: Introductionmentioning

confidence: 99%

“…[30][31][32] Besides these pre-treatments, some efficient surfactants and promoters have a substantial role in the flotation response of low rank/oxidized coal. [33,34] Most of the Indian coal washeries use a physical beneficiation process involving unit operations such as heavy media bath, jig, spiral, and hydro-cyclone. During the process, a significant amount of recoverable carbon values escapes to the tailing pond.…”

Section: Introductionmentioning

confidence: 99%

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Flotation response of coal washery reject fines: Characteristics, process optimization, and oxidation

et al. 2023

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The present paper outlines the characterization, electrokinetic behaviour, and flotation response of rejected coking coal fines with 32.5% ash generated in a coal washery in Eastern India. The response methodology and central composite rotatable design (RSM-CCRD) were used for the process modelling and optimization of the flotation process using diesel, methyl isobutyl carbinol (MIBC), and sodium hexametaphosphate as a collector, frother, and depressant to maximize ash reduction, yield, and combustible recovery. At optimum condition, a 9.7% clean ash coal was achieved with a 63% yield at collector, frother, and depressant dosages of 0.78, 0.31, and 0.80 kg/ton, respectively. The model prediction and experimental data corroborated sufficiently. Subsequently, within 1 year, the fines oxidized and did not float with the collector. Fourier-transform infrared spectroscopy (FTIR) confirmed surface oxidation on oxidized coal. The oxidized coal responded favourably to acid oil, a vegetable oil refinery waste. With acid oil as a collector, the oxidized coal can upgrade to 12% clean ash coal with a 60% yield; the combustible recovered is 80%. The work indicates successful upgradation of fresh and oxidized coal using the froth flotation process.

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“…[ 30–32 ] Besides these pre‐treatments, some efficient surfactants and promoters have a substantial role in the flotation response of low rank/oxidized coal. [ 33,34 ]…”

Section: Introductionmentioning

confidence: 99%