Neutralization of Sulfuric Acid in Copper Sulfate Solution

Barium sulphate is very insoluble, so you could add barium hydroxide. Calcium sulphate is moderately soluble, about 1.6 gm/l, which I would guess is too high for your needs. But if not calcium hydroxide (lime) is likely to be much more readily available, and cheaper.

Excellent answer from Codemaster- providing it is not a concern if you have excess alkalinity or else you are prepared to titrate each batch.

Otherwise you could wash the solution with marble chips (calcium carbonate), which would likely be much slower but will not risk a pH overshoot.

No matter what chemicals you use, what reaction you use or volumes you are working with MAKE SURE THE PROPER PERSONAL PROTECTIVE EQUIPMENT ARE USED BY EVERYONE! Sulfuric Acid at any strength, which you didn't mention, requires an extreme amount of caution and respect. You probably have seen what battery acid, a low concentration, can do to clothes and hands let alone eyes. Sulfuric is hydroscopic so it draws water out of such things as eyes, mouths, arms, legs, torsos, ears, noses, etc. which are burns of great pain.

Please show it the proper respect. If in doubt overprotect those involved. I gained extreme respect for it after someone's unauthorized apparatus exploded in a high school lab. No it wasn't mine but a couple of small burns were. Please use extreme caution no matter what mixture or concentration the material is if it has any sulfuric acid in it.

Good Luck, Old Salt