Consider what do you want, do you want a slurry of BaSO4 in water or solid BaSO4 ?

I would suggest mixing a solution of barium chloride with sodium sulfate in a centrifudge tube, then centrifudge it. Then decant off the supernatent, add water, shake, centrifudge again.

Repeat the process until the conductivity of the supernatent layer is nice and low, this would give you a good sample of barium sulfate. If you want to read about barium sulfate you should look at the recent work at Chalmers on the subject of radium sulfate, at the nuclear chemistry section in Chalmers a lot of work has been done in recent years on this topic. The goal of the work was to understand the solubility of radium sulfate under different conditions, but some of the work was done using barium as a surogate for radium.

Thanks Dear colleague

I need a procedure for synthesis of barium sulfate in large scale (industrially ).

Barium sulphate is prepared by  adding sulphuric acid in BaCl2 in water & digesting ppted solid on water bath, followed by filtration through filter paper No. 41