Transactions . at, if there is a washery loss, or refuse, of 15per cent., the float in the refuse should range from 7 to 10 per cent. Thesink in the washed coal should be held to the minimum, also, to obtainthe most efficient reduction of impurities, though there is no loss of prod-uct as in the case of float in the refuse. The sink and float tests on the raw coal may not be a correct guideas to the results to be obtained by washing but it gives some indicationof the possibilities. I have always maintained that the actual washingoperation ought to produce a lower sulfur than is indicated by th
Transactions . at, if there is a washery loss, or refuse, of 15per cent., the float in the refuse should range from 7 to 10 per cent. Thesink in the washed coal should be held to the minimum, also, to obtainthe most efficient reduction of impurities, though there is no loss of prod-uct as in the case of float in the refuse. The sink and float tests on the raw coal may not be a correct guideas to the results to be obtained by washing but it gives some indicationof the possibilities. I have always maintained that the actual washingoperation ought to produce a lower sulfur than is indicated by the deter-mination of the sulfur in the float on the raw coal, due to the fact thatwater in a jig is much thinner than the dense heavy solutions used formaking sink and float tests, and thus permits a separation of the floatsulfur. With this in view it may be permissible to multiply the sulfurin the float by a factor, say , to give the sulfur in the washed coal by I J. R. CAMPBELL 601 Railroad UDlObdlDgHoppers. Diatributing llupper ArniDgtdfor Delivenr .^f Coal aa Pt>nowB:Fines to CocTcyur tilze to Codtcjot Coal to ConTcyor 3 bl2«8 to k Intcnrediate. Col>. H orCoan>€ i ... G or Centrifugml Fig. 2.—^Flow sheet, Middlefokk Washery, U. S. Fuel Co. ()92 MECHANICAL SEPARATION OF SULFUR MINERALS FROM COAL jigging or lahling. Jlius, il llic suliui in Uie float from tlu; raw coalis per cent, then X ) = per cent., the sulfur in thewashed coal.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
