Method for preparing barium titanate

A method for preparing barium titanate, comprising:

• 1) Preparation of Ba—Ti mixed solution:
• dissolving BaCl2.2H2O into TiCl4 solution to prepare Ba—Ti mixed solution with a Ba/Ti molar ratio of 1:1;
• 2) Preparation of synthetic agent:
• adding ammonia and ammonium bicarbonate into deionized water to prepare a solution with NH4OH/NH4HCO3 molar ratio of 5:1;
• 3) Preparation of barium titanate:
• adding the Ba—Ti mixed solution and the synthetic agent into a reactor for synthesis reaction to obtain a slurry;
• 4) Separation:
• separating the slurry from step 3) by pressure filtration, thermal washing the obtained solid, then pressure filtering and obtaining a filter cake;
• 5) Calcination:
• calcining the filter cake from step 4) for 1 hour at 590-610° C., and then calcining for 2 hours at 700-950° C.;
• 6) Crushing:
• crushing the solid from step 5) by a crusher to obtain barium titanate product.