Abstract: Commercial tests for fluidized-bed chlorination without sieve plate were carried out using titanium slag high or low in calcium and magnesium as main raw materials.In view of the fact that high calcium and magnesium content tends to cause agglomeration of the burden and blockage of the sieve plate which affects the normal process of chlorination,measures including gradual increase of blending ratio of high calcium and magnesium content titanium slag,appropriate addition of carbon and regular deslagging were taken to avoid negative influences.During the experiments,reaction temperatures in the fluidized-bed chlorinator,pressure fluctuation and deslagging conditions,as well as chemical analyses on furnace slag,slag from dust collecting and tail gas were studied.The commercial tests show that as the amount of titanium slag high in calcium and magnesium increases,there is a downward trend for reaction temperature in the fluidized-bed chlorinator and furnace top temperature,which can be solved by additional heat supply; slag discharging and fluctuation of bed pressure as well as the chemical compositions of furnace slag,slag from dust collecting and tail gas are in normal.It is feasible to use fluidized-bed chlorinator without sieve plate to chloridize titanium slag high in calcium and magnesium to obtain titanium tetrachloride.