| http://www.w3.org/ns/prov#value | - HF gas is released, leaving tailings of silica, carbon, sulfur, calcium carbonate, phosphorus pentoxide, and a host of othertailings generally not worth recovering mixed in with bulk fluorogypsum.Gaseous HF is condensed enough to liquify it to remove impurities such as SO2 and SiF4, which remain gasseous.
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