Defluorination of wet process phosphoric acid

Details Defluorination of wet process phosphoric acid Defluorination of wet process phosphoric acid

C - Chemistry, Metallurgy

01

B

23/72

C01B 25/237 (2006.01)

Patent

CA 1165975

ABSTRACT An improved method of defluorinating wet process phosphoric acid using silica-containing dust which is obtained as a waste product collected from the fumes of a submerged arc furnace process of making silicon metal alloys. The silica-containing dust has a very small particle size, and contains at least about 60% by weight silica (Sio2), and has a very high surface/mass ratio which increases the effi- ciency of the defluorination reaction. The defluorination reaction using this silica-contain- ing fume takes less time than required using prior methods employing diatomaceous earth as the silica source. The pre- sence of silicon metal alloy particles in the dust are thought to have a catalytic effect on the defluorination reaction.

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