It's the primary acid in grape wine. It sometimes is added to other wines to balance the acidity and to give the wine a bit more acid if it needs it. I typically use acid blend which is a blend of tartaric, malic and citric acid, but tartaric acid can be used alone if you want to.
If you are not a winemaker I don't think you would find any reasonable use for the tartaricacid and especially such a large quantity!