Abstract: The technology，which uses titanium slag to replace ilmenite for the production of titanium dioxide can effectively reduce consumption of sulfuric acid，and especially can prevent the generation of copperas.It is the development trend of clean production of titanium dioxide industry with sulfuric acid process.However，due to lack of the strongly exothermal materials（such as Fe₂O₃） in the slag，the acidolysis reaction will need to supplement some heat to maintain it go on continuously like ilmenite.A set of laboratory continuous acidolysis device was independently developed by heat analysis of slag′s continuous acidolysis.Experimental results showed the titanium slag continuous acidolysis could be heated and the problem of insufficient heat was solved；the key process parameters，such as the slurry preheating temperature，aging time，acid-material ratio，and reaction acid concentrations etc.were mastered，and the device worked very steadily；continuous acidolysis rate compared with intermittent acid solution was improved by more than 2%.Furthermore，energy consumption in the production of titanium dioxide was saved，and the quality of titanium liquid of continuous acidolysis was stable and controllable.

Key words: titanium slag, ilmenite , continuous acidolysis, titanium dioxide