Patent GB-1122781-A (GB)
Title: Process for the production of finelydivided inorganic mixtures
IPC: C01B33/20
Filed: 1965-07-16
Abstract: Finely divided inorganic mixtures containing silica are produced by injecting into a stream of silicon monoxide at above 1000 DEG C., a solution of one or more acids, bases, thermally-decomposable metal salts, thermally-decomposable salts of anion-forming elements or complex compounds of heavy metals, and recovering the resulting inorganic mixture by cooling. Examples of the compounds yielding the co-components are boric acid, phosphoric acid, sodium hydroxide, magnesium nitrate, magnesium acetate, silver nitrate, copper acetate, bismuth citrate, zinc nitrate, nickel chloride, nickel nitrate, nickel acetate, ferric nitrate, sodium carbonate, sodium phosphate, aluminium formate, ammonium dichromate, molybdate or phosphate, complexes e.g. ammines or of tartaric acid, citric acid or EDTA, such as ferriammonium citrate.  These compounds may be in aqueous solution and may be fed through nozzles e.g. with simultaneous supply of air or oxygen.  The gas stream of silicon monoxide may be formed by reduction of quartz with carbon e.g. coke, silicon, silicon carbide, aluminium or magnesium in an electric arc furnace.  The silica may be dissolved out e.g. by caustic soda or hydro-fluoric acid.  The remaining oxides may be reduced to the metals with hydrogen and the mixture is then suitable for use as a catalyst.ALSO:Finely divided inorganic mixtures containing silica are produced by injecting into a stream of silicon monoxide at above 1000 DEG  C., a solution of one or more acids, bases, thermally-decomposable metal salts, thermally-decomposable salts of anion-forming elements or complex compounds of heavy metals, and recovering the resulting inorganic mixture by cooling. Examples of the compounds yielding the co-components are boric acid, phosphoric acid, sodium hydroxide, magnesium nitrate, magnesium acetate, silver nitrate, copper acetate, bismuth citrate, zinc nitrate, nickel chloride, nickel nitrate, nickel acetate, ferric nitrate, sodium carbonate, sodium phosphate, aluminium formate, ammonium dichromate, molybdate or phosphate, complexes, e.g. amines or of tartaric acid, citric acid or EDTA, such as ferriammonium citrate.  These compounds may be in aqueous solution and may be fed through nozzles, e.g. with simultaneous supply of air or oxygen.  The gas stream of silicon monoxide may be formed by reduction of quartz with carbon, e.g. coke, silicon, silicon carbide, aluminium or magnesium in an electric arc furnace.  The silica may be dissolved out, e.g. by NaOH or KOH or hydrofluoric acid.  The co-component may be converted into the sulphide by treatment with H2S or S vapour, or into the silicate by heating.ALSO:Finely divided inorganic mixtures containing silica are produced by injecting into a stream of silicon monoxide at above 1000 DEG C, a solution of one or more acids, bases, thermally-decomposable metal salts, thermally-decomposable salts of anion-forming elements or complex compounds of heavy metals, and recovering the resulting inorganic mixture by cooling. Examples of the compounds yielding the co-components are boric acid, phosphoric acid, sodium hydroxide, magnesium nitrate, magnesium acetate, silver nitrate, copper acetate, bismuth citrate, zinc nitrate, nickel chloride, nickel nitrate, nickel acetate, ferric nitrate, sodium carbonate, sodium phosphate, aluminium formate, ammonium dichromate, molybdate or phosphate, complexes e.g. ammines or of tartaric acid, citric acid or EDTA, such as ferriammonium citrate.  These compounds may be in aqueous solution and may be fed through nozzles e.g. with simultaneous supply of air or oxygen.  The remaining oxides may be reduced to the metals with hydrogen and the mixture is then suitable for use as a catalyst.