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为了综合利用工业废料,降低建筑造价和解决抹面石灰短缺,长沙市城建科研所和长沙市第二机制砖厂在1979年对湖南省湘乡铝厂在生产氢氟酸过程中排放出大量废渣——化学石膏即氟石膏进行了作建筑物室内抹面材料的试验与研究,目前已经批量生产。湘乡铝厂所排放的氟石膏,在存放过程中逐渐由无水石膏转化为半水石膏或二水石膏或其混合物,其化学成分(％)SiO_2 1.02;Al_2O_30.5;MgO 0.54;Fe_2O_3 0.21;CaO 33.08;SO_3 43.68;结晶水19.7。
In order to comprehensively utilize industrial waste, reduce construction costs, and solve the shortage of screed lime, the Changsha Urban Construction Research Institute and the Changsha Second Mechanism Brick Factory produced a large amount of waste residue during the production of hydrofluoric acid in Hunan Xiangxiang Aluminum Plant in 1979— - Chemical gypsum, ie, fluorogypsum, was tested and researched as a building interior plastering material and it has now been mass-produced. Fluorine gypsum discharged from Xiangxiang Aluminum Factory is gradually converted from anhydrous gypsum into hemihydrate gypsum or dihydrate gypsum or a mixture thereof during storage, and its chemical composition (%) SiO 2 1.02; Al 2 O 3 0.5; MgO 0.54; Fe 2 O 3 0.21 CaO 33.08; SO_3 43.68; Crystalline water 19.7.