摘要:
钛石膏为硫酸法钛白生产过程中的副产品,主要物相为二水硫酸钙,少量物相为白云石。钛石膏中主要杂质为:Fe2O3、Al2O3、SiO2、MgO和TiO2,这些杂质会影响钛石膏的凝结性能,降低钛石膏的凝结强度。为了提高钛石膏的凝结强度,选择矿化剂对钛石膏进行改性,选择的矿化剂主要为:硅酸盐水泥熟料、硅微粉和粉煤灰,改性效果排序为:硅酸盐水泥熟料>硅微粉>粉煤灰。通过正交试验研究了矿化剂复配对钛石膏改性的影响,在本次试验条件下,最优复配配方为:硅酸盐水泥熟料配入量16%;硅微粉配入量6%;粉煤灰配入量3%。
Abstract:
Titanium gypsum is a by-product of titanium dioxide production by sulphate process,with calcium sulfate dihydrate as the main phase accompanying a small quantity of dolomite.The main impurities of titanium gypsum include Fe2O3,Al2O3,SiO2,MgO and TiO2,which will affect the condensation properties of titanium gypsum and reduce the condensation strength. In order to improve the condensation strength of titanium gypsum,modification of titanium gypsum was carried out respectively using the silicate cement clinker,silica powder and fly ash as mineralizer.The order of modification effect for the selected mineralizers is silicate cement clinker ﹥ silica powder ﹥ fly ash.The effect of multiple mineralizers on the titanium gypsum modification was investigated by orthogonal experiments, and the optimal formula was confirmed to be 16% silicate cement clinker,6% silica powder and 3% fly ash.
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