Defluorination of wet process phosphoric acid

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

1981-03-27

1982-05-18

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

C01B 2516

Patent

active

043305172

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 (SiO.sub.2), and has a very high surface/mass ratio which increases the efficiency of the defluorination reaction.
The defluorination reaction using this silica-containing fume takes less time than required using prior methods employing diatomaceous earth as the silica source. The presence of silicon metal alloy particles in the dust are thought to have a catalytic effect on the defluorination reaction.

REFERENCES:
patent: 2123783 (1938-07-01), Knox
patent: 2987376 (1961-06-01), Gloss
patent: 3800029 (1974-03-01), Omoto et al.
patent: 3951646 (1976-04-01), Hamada et al.
patent: 3983218 (1976-09-01), Heins
patent: 4046860 (1977-09-01), Kidde
patent: 4055626 (1977-10-01), Drechsel et al.

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