US2901321A - Two-step method of making calcium oxide from ...
US2901321A US592478A US59247856A US2901321A US 2901321 A US2901321 A US 2901321A US 592478 A US592478 A US 592478A US 59247856 A US59247856 A US 59247856A US 2901321 A US2901321 A US 2901321A Authority US United States Prior art keywords calcium sulfate gypsum calcium oxide sulfur temperature Prior art date 1956-06-20 Legal status (The legal status is an .