Substantially all of the fluorine that is present in the stack gas from fused tricalcium phosphate furnaces, nodulizing kilns, and calcium metaphosphate furnaces is in the form of hydrogen fluoride (HF). A considerable portion of the fluorine in the gases evolved from superphosphate manufacture is in the form of silicon tetrafluoride (SiF4) (1). Conclusive information is not at hand regarding the form of the fluorine compounds from other processes.
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