| 摘要 |
<p>PURPOSE:To produce gypsum hemihydrate useful for the production of gypsum board for architectural material, etc., by using hydrogen sulfide as a starting raw material. CONSTITUTION:Gypsum hemihydrate is produced by introducing a gas having high SO2 concentration and obtained by the combustion of hydrogen sulfide separated from a stock oil into a reactor to contact the gas with a water slurry, supplying limestone powder (CaCO3) and air to the reactor to effect the absorption, oxidation and neutralization of SO2 and obtain a gypsum slurry, separating a gypsum cake from the slurry by solid-liquid separation and heating the cake with heat generated by the combustion process. The process enables the production of gypsum hemihydrate in high efficiency by effectively utilizing the heat generated in the same process.</p> |
