Method of producing phosphorus pentoxide in a kiln with reduced

Details Method of producing phosphorus pentoxide in a kiln with reduced Method of producing phosphorus pentoxide in a kiln with reduced

1982-05-10

1983-08-09

Heller, Gregory A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423318, 423322, 423323, C01B 2512

Patent

active

043978266

ABSTRACT:
A process for producing phosphorus pentoxide from phosphate ore includes the steps of mixing phosphate ore containing silica with solid carbonaceous material and a silica fluxing agent to form a feed mixture and thereafter forming the feed mixture into pellets. Alternatively, pellets may be formed using phosphate ore containing silica and carbonaceous material which are then coated with a silica fluxing agent. The pellets are heated by exposure to radiation eminating from an oxidation zone within a kiln to a temperature enabling the silica fluxing agent to promote melting of the silica proximate to surface areas of the pellet in order to seal internal portions of the pellet from the oxidizing zone and thereby reduce premature oxidation of the carbonaceous material in the pellet. Thereafter the pellets are heated to a temperature sufficient to reduce the phosphate in the pellets by reaction with the solid carbonaceous material to form elemental phosphorus vapor. Sufficient oxygen-containing gas is introduced into the kiln to cause oxidation of the elemental phosphorus vapor within the oxidation zone to produce phosphorus pentoxide.

REFERENCES:
patent: 1655981 (1928-01-01), Barr
patent: 3235330 (1966-02-01), Lapple
patent: 3241917 (1966-03-01), Lapple
Megy et al, Ser. No. 265,307, filed May 20, 1981.

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