| 摘要 |
<p>A plaster for use in the production of surface coatings, moulds and moulded artifacts can be made from ferrous sulphate, for example industrial waste ferrous sulphate in the form of copperas. The process involves heating a slurry or solution of the ferrous sulphate and a suitable calcium compound, which may be ground limestone, ground chalk, slaked lime or quicklime, under elevated temperature and pressure. The resulting crystalline product can be formed into a powder or used directly as a slurry and gives properties similar to commercial gypsum based plasters.</p> |
