| 摘要 |
<p>Producing difficultly soluble anhydrite-II comprises dehydrating dry finely divided dihydrate in a calcining unit, holding at 580-650 degrees C under a steam atmosphere of less than 0.2 bars partial pressure preferably for 12-30, preferably 14-18 minutes to form a phase mixture of mainly difficultly soluble anhydrite-II and a small amount of insoluble anhydrite-II and anhydrite-III, and then grinding to a Blaine specific surface of greater than 4000, preferably 4000-6000, cm<2>/g.</p> |
| 申请人 |
SICOWA VERFAHRENSTECHNIK FUER BAUSTOFFE GMBH & CO. KG, 52072 AACHEN, DE |
发明人 |
MORGENROTH, HENNING, DR.-ING., 52152 SIMMERATH, DE;GLUECKLER, MARTIN, DR.-ING., 52064 AACHEN, DE;HENDAN, BENEDIKT, DR.RER.NAT., 52070 AACHEN, DE |
