| 摘要 |
1368092 Cement NORCEM AVD DALEN AS 26 Aug 1971 [26 Aug 1970] 36942/71 Heading C1H The alkali content of cement clinker is reduced by washing with water during or after milling to cement and optionally with the addition of gypsum. A coarse fraction can be separated off and then further milled. S- containing compounds can be added to the raw charge so that the alkalies are transformed into soluble sulphates during burning. Further washing with a liquid which does not react with cement and which can be evaporated and recovered can be made. Retarders can be added to the wash water. |
