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At 14:56 25/09/01 +0100, you wrote: >I have today come across 2 references to the use of barytes in coal >washeries, in one case ( Lilleshall) the washery was not working and the >offer of barytes was turned down, in the other case (Cupola, Sheffield) the >offer was turned down because the barytes, though the quality was adequate >was not fine enough. As far as I am aware Snailbeach (Lordshill) Mine sold >their product jigged, double jigged or crude at this time (1945). What was >the barytes used for in the washeries? >All the best >Mike Shaw > Barytes was used as a density medium to float coal. As the Barytes slurry has a higher density than natural mediums the density of the cut off is higher and results in a product with a lower ash content (higher CV) Graham **************************** * Graham Owens * * [log in to unmask] * ****************************