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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
and phosphate rock in a mass ratio of, typically, : : . a modern furnace has a diameter of approximately m and is m high and can produce tonnes of phosphorus a year. the reaction may be represented as: gaseous phosphorus and carbon monoxide, from the top of the furnace, are passed into a spray of water...
https://essentialchemicalindustry.org/chemicals/phosphorus.html