| 发明名称 |
Process for preparing calcium sulphate hemihydrate, and hemihydrate so obtained. |
| 摘要 |
Process for preparing calciumsulphate hemihydrate by recrystallizing calciumsulphate dihydrate, e.g. gypsum obtained by digestion of phosphate ore, using concentrated nitric acid at elevated temperatures. The diluted acid is concentrated by absorption of nitrous gases and recycled in the process.
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| 申请公布号 |
EP0021474(A1) |
申请公布日期 |
1981.01.07 |
| 申请号 |
EP19800200492 |
申请日期 |
1980.05.23 |
| 申请人 |
UNIE VAN KUNSTMESTFABRIEKEN B.V. |
发明人 |
SMIT, ANDREAS CHRISTIAAN MICHAEL;WETERINGS, CORNELIS ANTONIUS MARIA |
| 分类号 |
C01F11/46;(IPC1-7):C01F11/46 |
主分类号 |
C01F11/46 |
| 代理机构 |
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代理人 |
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| 地址 |
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