PROCESS FOR THE PREPARATION OF HETEROPOLY ACID COMPLEX COMPOUNDS OF METAPHOSPHORIC METASILIC ACID, METAPHOSPHORIC ACID AND PHOSPHOROUS PENTOXIDE

摘要

A process for the production and recovery of oxygen containing compounds of phosphorous or silicon from starting materials comprising orthophosphoric acid and amorphous silica or its hydrates by adding siliceous material to an aqueous solution of orthophosphoric acid and thereafter heating the resulting product to dissolve the added silica and then to effect volatilization and boiling off of at least some of the water of solution and combined water of hydration of said product and continuing the heating to obtain a dry solid product which is at least one oxygen containing compound of phosphorous and/or silicon.