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Barium chloride, BaCl2, (CAS Number 10361-37-2 (anhydrous) 10326-27-9 (dihydrate)) is a toxic, water soluble salt that is frequently used for the analysis of sulfate. Barium sulfate is an insoluble compound finding use in analytical procedures, as a support for poisoned Pd catalysts, and also (due to its insolubility and low bioavailability), as a contrast agent in medical imaging applications.
There were a method developed by the Bureau of Mines to melt copper out of electric motor windings by submerging them in a bath of molten calcium chloride or barium chloride.
Barium chloride in the waste stream
The EPA Limits for barium both in water and solid waste is 100 ppm (mg/l)
Adding a bit of a soluble sulfate salt or sulfuric acid will precipitate any barium chloride in solution from a waste solution.
- GRF : Using molten salt to melt copper from motor windings
- Wikipedia : Barium chloride