Preparation of Ultra-fine TiO_2 Particles Using Micro-Mixing Precipitation Technology

A method of micro-mixing-precipitation technology was developed from membrane dispersion technology to prepare ultra-fine TiO2 particles. Titanic sulfate was selected as the dispersed phase, and ammonium acid carbonate as the continuous phase. The influences of the re-actant concentrations and two-phase flow rate were investigated. The crystal structure and crystal dimension of the particles were analyzed by XRD, morphology, particle size and size distribution by TEM. The results showed that the spheric TiO2 nano-particles with small size and narrow size distribution could be prepared with the method. The crystal dimension and the particle size of the Ti02 particles were increased with the increasing of reactant concentrations at first, then decreased. They also were decreased with the increasing of the flow rate of Ti(SO4)2 solution, but increased with the increasing of the flow rate of NH4HCO3 solution.