| 摘要 |
Preparing calcium sulfate hemihydrate, comprises (a) introducing gypsum and optionally water into a stationary pressure-tight gypsum kettle, to form a material column, (b) supplying energy to the gypsum kettle until the temperature of gypsum is greater than 110[deg] C, and converting gypsum into calcium sulfate hemihydrate at a maximum excess pressure of 100-5000 hPa, and (c) drying calcium sulfate hemihydrate. Independent claims are also included for: (1) calcium sulfate hemihydrate obtainable by the above method; and (2) a device for producing calcium sulfate hemihydrate, comprising a pressure-tight receiving container having a filling opening for filling gypsum and optionally water, which is closable in a pressure-tight manner, a discharge opening for removing the produced calcium sulfate hemihydrate, which is closable in a pressure-tight manner, and a safety device for discharging excess of pressure. |
