Study on Modification of Titanium Gypsum by Mineralizers

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.