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为了开发利用南京石膏矿每年生产近30万吨、储量十分丰富的硬石膏,近年来南京工学院与该矿配合,根据硬石膏的水化机理,选用粉煤灰、水泥和明矾石作为水化激发剂开展研究利用已取得成功。研究采用该矿生产的硬石膏是一种粒径≯20厘米的块状体,加工细度为4,900孔筛余≯4％,测得的比重为2.92克/厘米~3,其松散容重为919公斤/米~3,水化初凝时间为15小时,终凝时间为17小时,是一种三天抗压强度很低、原无实用价值的材料。粉煤灰系采用南京热电厂的干排灰废料(灰黑色粉体)。加工细度亦要求达到4,900孔筛余≯4％。水泥就近取用中国水泥厂生产的525号普硅水泥和庐江矾矿出产
In order to develop and use the Nanjing Gypsum Mine to produce an anhydrite of nearly 300,000 tons per year, which is very rich in reserves, in recent years, Nanjing Institute of Technology cooperated with this mine. According to the hydration mechanism of anhydrite, fly ash, cement and alumite were selected as hydration. Research and utilization of stimulating agents have been successful. The anhydrite produced by this mine was studied to be a lumpy body with a size of ≯20 cm. The processing fineness was 4,900 holes, and the measured specific gravity was 2.92 g/cm~3. The loose bulk density was 919. Kg/m~3, hydration initial settling time is 15 hours, and final settling time is 17 hours, which is a kind of material with low three-day compressive strength and no practical value. Fly ash uses dry ash waste from Nanjing Thermal Power Plant (gray black powder). The processing fineness also required to reach 4% of the 4,900 hole sieve. The cement was taken near the No. 525 Portland cement produced by the China Cement Plant and the Minjiang Tantalum mine.