GR78310

In the high-pressure sulfuric acid leaching of nickeliferous oxide and silicate ore, there is a tendency for the formation of scale on autoclave surfaces. The scale comprises oxides and sulfates of metals selected from the group consisting of aluminum, iron, silicon and magnesium. The scale is chemi...

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Bibliographische Detailangaben
Hauptverfasser:	MAHESH C. JHA, G. W. FUSSIEZ
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS DIFFUSION TREATMENT OF METALLIC MATERIAL FERROUS OR NON-FERROUS ALLOYS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL INORGANIC CHEMISTRY METALLURGY PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	In the high-pressure sulfuric acid leaching of nickeliferous oxide and silicate ore, there is a tendency for the formation of scale on autoclave surfaces. The scale comprises oxides and sulfates of metals selected from the group consisting of aluminum, iron, silicon and magnesium. The scale is chemically removed by flushing the autoclave following completion of a leaching regime with a sulfuric acid solution containing about 20 to 100 gpl H2SO4 at a temperature of about 150 DEG C. to 250 DEG C. and a pressure ranging from about 54 psig to 562 psig for a time sufficient to effect substantial removal of the scale.