A PROCESS FOR THE PRODUCTION OF A FLUORIDE-CONTAINING COMPACTED FLUX

A compacted fluoride flux made by treating an aq. soln. of fluosilicic acid pref. 20-30 wt. % concn., with an alkaline earth carbonate suspension in water, followed by sepn. of the fluoride-silica ppte., drying and granulation. At a convenient stage of the process, a material low in silica is opt. a...

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Bibliographische Detailangaben
Hauptverfasser:	SPRECKELMEYER B, NIEDERPRUEM H
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY FERROUS OR NON-FERROUS ALLOYS METALLURGY METALLURGY OF IRON PRETREATMENT OF RAW MATERIALS PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL PRODUCTION AND REFINING OF METALS TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	A compacted fluoride flux made by treating an aq. soln. of fluosilicic acid pref. 20-30 wt. % concn., with an alkaline earth carbonate suspension in water, followed by sepn. of the fluoride-silica ppte., drying and granulation. At a convenient stage of the process, a material low in silica is opt. added so that the silica content of the end prod. is 3-15, pref. 5-10 wt.% SiO2. The carbonates are pref. calcium- or magnesium- carbonate, in an excess of pref. 1-5% in relation to the fluosilicic acid, and in an aq. suspension with a solid:water ratio of 1:1-4. The low-silica material is pref. natural fluorspar, waste prods. contg. fluoride, surplus alkaline-earth carbonates, bauxite and/or clay. For granulation, lignine sulphonate, molasses and/or bentonite may be used. The briquettes made from the material were heated for 1 hour at 250 degrees C, after which they showed good strength and were water- and frost-resistant.