Optimization of Process Conditions for Leaching of Middling Coal. Issue 2 (17th February 2018)

• Record Type: Journal Article
• Authors: Sriramoju, S. K.; Suresh, A.; Lingam, R. K.; Ray, T.; Dash, P. S.; Banerjee, P. K.
• Is Part Of: International journal of coal preparation and utilization. Volume 38:Issue 2(2018)
• Page Start: 88
• Page End: 97
• Publication Date: 2018-02-17
• Subjects: Coal -- mineral matter -- alkali -- demineralization -- leaching -- mineral processing; Coal preparation -- Periodicals; Coal -- Research -- Periodicals; 662.62
• DOI: 10.1080/19392699.2016.1200034
• Languages: English
• ISSNs: 1939-2699

Abstract

ABSTRACT: In a typical coal washery, middlings are generated as a byproduct of a dense media cyclone having a size range of -13+0.5 mm and an ash content of 40–45%. Nearly 40% of the feed material is discharged as middlings. Middlings have good carbon values but embedded minerals in it and, hence, it is difficult to wash using conventional physical-cleaning techniques. Here in this article, the optimization of process variables from the lab scale to the pilot scale with a chemical-leaching technique is reported. Almost a 68% ash reduction could be achieved while maintaining the optimum process conditions. Higher reaction temperature, increased alkali concentration, and lesser reaction time favor the leaching process. Moreover, the alumina-to-silica ratio reduced from 0.53 to 0.25 and the phosphorus content significantly reduced by 90%.