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oxide, aluminium oxide, and silica. it occurs widely but important sources are in the us (florida, north carolina), morocco, tunisia, russia and china. to optimize production efficiency, the feed of phosphate rock into a furnace needs to be as uniform as possible. to achieve this, phosphate rock is heated
well as phosphorus oxy-acids, hexafluorosilicic acid, ammonia, and silica. phossy water is neutralized with lime (occasionally ammonia), settled, and then treated with chlorine to remove the last traces of phosphorus. phosphorus is transported in tanks under water, or under nitrogen, the tanks being heated...
https://www.essentialchemicalindustry.org/chemicals/phosphorus.html