首页>
外国专利>
Process for the hydrothermal conversion of gypsum from flue-gas desulphurization into alpha semihydrate calcium sulphate
Process for the hydrothermal conversion of gypsum from flue-gas desulphurization into alpha semihydrate calcium sulphate
展开▼
机译:烟气脱硫石膏水热转化为α-半水合硫酸钙的方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
Industrial waste gypsum is hydrothermally converted into calcium sulphate alpha -hemihydrate by heating an aqueous suspension of gypsum under pressure to temperatures of 130-180 DEG C, with addition of acids, flue gas desulphurisation gypsum in a concentration of 20-55 and preferably 40-50 % by weight being reacted with 0.02-1.0 and preferably 0.1-0.5 % by weight of sulphuric acid and 0.02-1.0 and preferably 0.1-0.6 % by weight of an organic acid at temperatures from 145 DEG C to 170 DEG C, preferably 155-165 DEG C, for times of 3-20 minutes, the reaction preferably being carried out continuously.
展开▼