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A PROCESS TO PRODUCE LOW ASH CLEAN COAL FROM HIGH ASH COALS FOR VARIOUS METALLURGICAL APPLICATIONS
A PROCESS TO PRODUCE LOW ASH CLEAN COAL FROM HIGH ASH COALS FOR VARIOUS METALLURGICAL APPLICATIONS
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机译：各种冶金应用中由高灰分煤生产低灰分洁净煤的方法
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摘要
The invention relates to a process for treating coal to lower ash content comprising (i) forming a slurry of coal fines in a N-Methyl-2-pyrrolidona (NMP) with a small amount of Cyclohexylamine (CHA), NMP and CHA ratio may vary 14:1 to 24:1 solution, said slurry containing about 15 to 25 ml of solution per g of coal, (ii) maintaining said slurry in refluxed condition at a temperature of about 170.degree. C for a period of about 15 minutes to 2 hours depending on the requirement, (iii) separating the refluxed solution in two parts by coarse filtration at 0.025 mm filter cloth separation cut size being variable depending on the particle size to be treated and the use of the end product namely filtrate or extract and the residue, (iv) recovering the solvent up to 85% by distillation of the extract, (v) precipitating the coal by adding water in concentrated extract, (vi) separating the coal by filtration, said coal having a reduced ash content and (vii) recovering the rest of the solvent by distillation of water-solvent solution.
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