Title: Integration of advanced preparation with coal liquefaction. Second quarterly technical progress report, January 1-March 31, 1984
Abstract: Illinois No. 6 and Wyodak coal samples were wet ground in a ball mill to >50 wt %-10 ..mu.. particle size. Several methods have been tried to directly measure the amount of ash released from the organic portion of the coal, such that it might be separated by oil agglomeration, including the use of electron microscopy and ion microprobe analysis. The results have been inconclusive. Hot-water treatment of Wyodak coal at 280 C for 30 minutes with 1% Fe/dry coal weight added as Fe/sub 2/(SO/sub 4/)/sub 3/ results in the removal of 90% of the calcium in the coal by ion exchange. This is the easiest known way to remove calcium, which can cause reactor plugging in the direct liquefaction of subbituminous coals by the formation of calcium carbonate deposits. Efforts to improve ash removal from Illinois No. 6 bituminous coal by oil agglomeration have resulted in the simultaneous removal of up to 55% of the non-pyritic ash while retaining 92% of the organic matter and 91 to 93% of the pyrite in the coal. The conditions may be optimized further. 4 tabs.
Publication Year: 1984
Publication Date: 1984-04-24
Language: en
Type: article
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