Volume No. 6 Issue No.: 3A Page No.: 653-659 Jan-Mar 12

 

CHEMICAL DEMINERALIZATION OF HIGH VOLATILE INDIAN BITUMINOUS COAL BY CARBOXYLIC ACID AND CHARACTERIZATION OF THE PRODUCTS BY SEM/EDS

 

Manoj B.

Department of Physics, Christ University, Hosur Road, Bangalore (INDIA)

 

Received on : November 25, 2011

 

ABSTRACT

 

A high Volatile Indian bituminous coal was subjected to a series of organic acid treatment at room temperature. Chemical leaching experiments were carried out using organic acids such as citric acid, oxalic acid, gluconic acid, acetic acid and EDTA. Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrum (EDS) analysis of the leached sample were carried out to study the efficiency of leaching. Citric acid and EDTA leaching reduced the ash content to less than 1.94% and 1.81 wt% respectively. EDTA, acetic acid and gluconic acid leaching was able to remove Ca completely with substantial removal of Al and Si. Citric acid leaching could remove the Al completely from the coal matrix.SEM image showed that surface areas of mineral phases were reduced with leaching. The calorific value of the leached coal reported an increase of 12% with EDTA and gluconic acid leaching.

 

Keywords : Organic acid leaching, Bituminous coal, Minerals, SEM, EDS

 

 

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