electron1539 12/01/2009 10:07:46 alk-sulphate single salts Dear All , kindly i want to clarify info. about Alk-sulphate ( Na2SO4 & K2SO4 ) these compounds share in build up in kiln inlet or come out with clinker ? Best regards Michael Clark 13/01/2009 08:16:56 The alkali sulphates will normally come out with the clinker. Sulphate based build-ups in the kiln inlet are normally CaSO4 based.