Submicron flake-shaped barium sulfate and preparation method thereof

The invention discloses a submicron flake-shaped barium sulfate and a preparation method thereof. The preparation method comprises the following steps: (1) pretreating barium sulfate, namely, preparing sulfur into a sulfur aqueous solution with the concentration of 4.0+/-0.5mol/L, degassing under stirring, and subsequently cooling and filtering so as to obtain pretreated sulfuric acid; (2) pretreating barium sulfide, namely, performing hot filtration on the barium sulfide solution with the concentration of 60-90g/L so as to obtain pretreated barium sulfide; (3) continuously synthesizing, namely, stirring to react the obtained BaS solution with the sulfuric acid obtained in the step (1) in the flow of 600+/-50L/h, and keeping the concentration of the sulfuric acid in the reaction solution be greater than 3.0g/L in the reaction process so as to obtain reaction slurry; (4) performing an aftertreatment procedure; and (5) performing a finished product procedure so as to obtain the barium sulfate product. The bariu