A CHEMICAL PROCESS FOR DEMINERALISATION OF CARBONACEOUS MATERIALS SUCH AS COAL AND COKE

摘要

A process for the demineralisation of carbonaceous material such as coal or coke, for the production of low ash per cent or less coal or coke which comprises in treating the high ash (above 17 to 35 percent) carbonaceous material with one or more alkalis selected from the ----- soda, causie potash soda ash and line ----- rapging between 100 and 400 Degree Celsius for a ----- 1 to 5 hours under ----- during which treatment reaction between ----- material and alkali takes place to form water soluble salits sodium and acid soluble sodio alumino complexes following which the reacted mass is diluted with water where after alkali-treated solid carbonaceous material is separated from the spent alkaline liquor by filtration or centrifugation from lowing which the said alkali-treated material is further treatment with ----- acid (e.g. 1-2N H2BO1) to dissolve ----- columino complexes which are filtered off to obtain ----- coal or coke.