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5667553 Methods for recycling electric arc furnace dust
392
PatentsALERT
metal ion into an alkali metal salt of mineral acid, converting phosphorus into hydroxyapatite, and pyrolyzing off the organic material; and pouring a solid mixture of the alkali metal salt of mineral acid and hydroxyapatite into water for dissolving the alkali metal salt of mineral acid in water for separate recovery of hydroxyapatite and the alkali metal salt of mineral acid. 5667553
METHODS FOR RECYCLING ELECTRIC ARC FURNACE DUST Keegel Joseph F Spring Lake, NJ, UNITED STATES assigned to Complete Recovery Process LLC A method for the separation and recovery of metals selected from the group consisting of iron, cadmium, zinc, and lead, from raw material comprising a mixture of metals, which comprises the steps of heating the raw material to a temperature sufficient to substantially vaporize cadmium, zinc, and lead, and insufficient to substantially vaporize iron;separating secondary dust and vapors produced during the first step from the residual sinter mass, which mass comprises iron; slurrying the secondary dust in an aqueous solution of ammonia ammonium carbonate to dissolve zinc and cadmium; separating a zinc/cadmium bearing leach liquor from substantially insoluble lead containing particles by filtration; treating the zinc/cadmium bearing leach liquor to recover cadmium by adding metallic zinc to the leachate to produce a cadmium containing cement; separating the cement from the leach liquor; and removing ammonia from the leach liquor to precipitate basic zinc carbonate. The methods of the invention are especially
suitable for treating electric arc furnace dusts. 5667555 METHOD FOR THE REMOVAL OF CALCIUM BY PRODUCTS DURING THE PRODUCTION OF AN IRON FEEDSTOCK
Myerson Allan; Burrows Charles A; Sanzenbacher Charles W; DiBella Paul R Brooklyn, NY, UNITED STATES assigned to Metals Recycling Technologies Corporation A method for the removal of calcium byproducts created during the production of an iron-based feedstock suitable for use as the feedstock for steel mills, from industrial waste streams containing iron, by treating the waste stream with an ammonium chloride leaching solution, treating the leachant with a soluble ammonium salt in which the negative ion will form an insoluble compound with calcium, and separating the undissolved precipitates comprising iron compounds and calcium compounds from the leachant solution. The undissolved precipitants may be treated further by elevated temperature roasting, resulting in the iron-based feedstocks. 5667557
HYDROMETALLURGICAL EXTRACTION AND RECOVERY OF COPPER, GOLD, AND SILVER VIA CYANIDATION AND ELECTROWINNING Fleming Christopher Andrew; Grot Walther G; Thorpe John Anton Peterborough, CANADA assigned to E I Du Pont de Nemours and Company
PatentsALERT
metal ion into an alkali metal salt of mineral acid, converting phosphorus into hydroxyapatite, and pyrolyzing off the organic material; and pouring a solid mixture of the alkali metal salt of mineral acid and hydroxyapatite into water for dissolving the alkali metal salt of mineral acid in water for separate recovery of hydroxyapatite and the alkali metal salt of mineral acid. 5667553
METHODS FOR RECYCLING ELECTRIC ARC FURNACE DUST Keegel Joseph F Spring Lake, NJ, UNITED STATES assigned to Complete Recovery Process LLC A method for the separation and recovery of metals selected from the group consisting of iron, cadmium, zinc, and lead, from raw material comprising a mixture of metals, which comprises the steps of heating the raw material to a temperature sufficient to substantially vaporize cadmium, zinc, and lead, and insufficient to substantially vaporize iron;separating secondary dust and vapors produced during the first step from the residual sinter mass, which mass comprises iron; slurrying the secondary dust in an aqueous solution of ammonia ammonium carbonate to dissolve zinc and cadmium; separating a zinc/cadmium bearing leach liquor from substantially insoluble lead containing particles by filtration; treating the zinc/cadmium bearing leach liquor to recover cadmium by adding metallic zinc to the leachate to produce a cadmium containing cement; separating the cement from the leach liquor; and removing ammonia from the leach liquor to precipitate basic zinc carbonate. The methods of the invention are especially
suitable for treating electric arc furnace dusts. 5667555 METHOD FOR THE REMOVAL OF CALCIUM BY PRODUCTS DURING THE PRODUCTION OF AN IRON FEEDSTOCK
Myerson Allan; Burrows Charles A; Sanzenbacher Charles W; DiBella Paul R Brooklyn, NY, UNITED STATES assigned to Metals Recycling Technologies Corporation A method for the removal of calcium byproducts created during the production of an iron-based feedstock suitable for use as the feedstock for steel mills, from industrial waste streams containing iron, by treating the waste stream with an ammonium chloride leaching solution, treating the leachant with a soluble ammonium salt in which the negative ion will form an insoluble compound with calcium, and separating the undissolved precipitates comprising iron compounds and calcium compounds from the leachant solution. The undissolved precipitants may be treated further by elevated temperature roasting, resulting in the iron-based feedstocks. 5667557
HYDROMETALLURGICAL EXTRACTION AND RECOVERY OF COPPER, GOLD, AND SILVER VIA CYANIDATION AND ELECTROWINNING Fleming Christopher Andrew; Grot Walther G; Thorpe John Anton Peterborough, CANADA assigned to E I Du Pont de Nemours and Company