摘要:
钛石膏为硫酸法钛白生产过程中的副产品,钛石膏大量堆积对环境造成污染,研究钛石膏的性能特点,对于选择合理的回收利用方案具有重要的指导意义。主要对钛石膏的物相组成、脱水温度、脱水时间和凝结特点进行试验研究。结果表明:钛石膏的主要物相为二水硫酸钙,少量物相为白云石,钛石膏脱除结晶水温度控制在200℃左右,脱除结晶水时间控制在50 min左右较适宜。添加柠檬酸作缓凝剂时,煅烧温度从120℃提高到200℃,钛石膏的凝结时间从1 800 s缩短为1 000 s,可以满足浇注成型的时间要求。
Abstract:
Titanium gypsum,which is a byproduct in titanium dioxide production by sulfuric acid method,causes environmental contamination during accumulation.Investigations on the properties and characters of titanium gypsum have important guiding significance on proper selection of recycle and utilization methods of titanium gypsum.The Phase component,anhydration temperature and time,and coagulation features of titanium gypsum were studied in this paper.It is shown that titanium gypsum is composed of calcium sulfate dihydrate as main phase and small quantity of dolomite.The feasible temperature and time for anhydration of the crystal water in titanium gypsum should be controlled at about 200℃ and 50 min,respectively.With addition of citric acid as retarder and calcination temperature increased from 120 to 200℃,the coagulation time of titanium gypsum can be decreased from 1 800 to 1 000 s,which satisfies the time requirement for pouring.
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