North America
...
2025-08-15 00:50
2041
North America
Scrap zinc or concentrated zinc ores are dissolved in sulfuric acid, the solution is purified and the two solutions are reacted. A heavy mixed precipitate results that is 28 to 30% zinc sulfide and 72 to 70% barium sulfate.
Porcelain White, 32 per cent sulphide, 68 per cent barium sulphate.