Evaluation of the washability characteristics of Khushab coal (Pakistani) by heavy media separation process

Hafiz Sana, Sumaira Kanwal, Javaid Akhtar, Naseer Sheikh and Shahid Munir

Energy & Environment, 2017, vol. 28, issue 5-6, 598-607

Abstract: The use of high-sulfur Pakistani coals can cause serious problems of slagging and fouling in thermochemical conversion reactors along with environmental issues like acid rain, etc. In this study, a pre-combustion technique, namely heavy media separation, is employed for the cleaning of low-grade Pakistani coal. Six crushed coal samples of different particle sizes were individually subjected to heavy media solutions of ZnCl 2 of different specific gravities. It was found that the sample with a particle size of −6.25+4 mm at specific gravity of 1.4 produced the optimum float product as clean coal, showing 83.53% yield of clean coal with 1.24% ash and 1.0% sulfur contents. An overall reduction of 91.68% in ash and 86.11% sulfur contents was obtained. Moreover, up to 19.3% enhancement of gross calorific value was achieved. The resultant clean coal can be used in various energy recovery schemes in Pakistan such as coal-fired power plants and cement industries.

Keywords: Coal washing; Pakistani coal; ash; sulfur; proximate analysis; gross calorific value (search for similar items in EconPapers)
Date: 2017
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Persistent link: https://EconPapers.repec.org/RePEc:sae:engenv:v:28:y:2017:i:5-6:p:598-607

DOI: 10.1177/0958305X17714151

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