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4673431 Furnace dust recovery process
369
NewPatents leaching with sodium hydroxide and/or sodium aluminate to dissolve molybdenum, vanadium and/or tungsten and provide a solid, filterable residue containing alumina and cobalt and/or nickel, the residue is digested with sodium hydroxide to give a sodium aluminate solution and a residue enriched in nickel and/or cobalt, alumina is recovered from the sodium aluminate solution as a solid and the remaining supernatant solution is recycled to the oxygen pressure leaching step wherein the alumina content of the aluminate solution is precipitated and a bleed for metals in the aluminate solution is provided.
4673431 FURNACE
DUST RECOVERY PROCESS
Francis H Bricmont assigned to Bricmont & Associates Inc A process for selective vaporization of oxides from recovered waste dust collected from a bag house. Pellets are formed from the waste dust and dried to permit charging in an oxidizing chamber wherein an oxidizing atmospheric is maintained. The chamber is heated to a temperature sufficient to vaporize lead oxide and, if present, also oxides of cadmium, potassium and sodium. The vapors are cooled and separated from furnace gas. The residual oxidized mass is cooled after removal from the oxidizing chamber and fed into a reduction chamber wherein a reducing atmosphere is maintained. The reduction chamber is heated to a temperature of between 1800 and 2000 degrees Fahrenheit to reduce zinc oxide and form zinc vapors which are cooled and separated from furnace gas. Lead oxide particles recovered from the oxidizing process are reduced to lead.
fluent of said mixture and bringing it into contact with baffles which are arcuately disposed in series so as to divert the gold onto collecting trays. The trays are disposed within a chamber in such manner as to create pathways for the effluent so that divergent streams of said effluent are directed to the baffles to enhance the recovery operation.
8703575 METHOD AND PLANT FOR THE RECOVERY OF ENERGY FROM WASTE AND RESIDUES Bernard NOBILET, Michel BONHOMME, Philippe DESPLAT, 10, le Petit Nice, F-13320 Bout Be1 Air, France assigned to PROPI0RG.A After screening, the residues are subjected to bacterial digestion in a methanisation reactor (105) and the solid phase of the digestate is then subjected to incineration in a furnace (116) which supplies a heat recuperator (119), the furnace being supplied with make-up fuel by the methane coming from the digester (105), whereas the circuit of fumes downstream of the recuperator (119) is used to heat by means of at least one secondary circuit (138, 139) the magma being processed in the digester and/or the slurry separated from the digestate before being recycled to the digester.
4676900 WATER TRAP SYSTEM FOR RECOVERING PRECIOUS METALS Jorge Masihy, Jose Navarrete
4673492 GOLD RECOVERY
APPARATUS
Hubert C Jasinski An apparatus for recovering gold from goldcontaining mixtures by forming a gaseous ef-
Disclosed is an apparatus for recovering solid particulates in liquid, typically water containing precious metal particles, such as is produced as a by-product of jewelry manufacture. The apparatus has a settling tank, which contains a fabric trap for entrapping very fine particles. Water in the tank is moved through the trap by a syphon producing a very small pressure gradient across the trap, which, because the pressure is so
NewPatents leaching with sodium hydroxide and/or sodium aluminate to dissolve molybdenum, vanadium and/or tungsten and provide a solid, filterable residue containing alumina and cobalt and/or nickel, the residue is digested with sodium hydroxide to give a sodium aluminate solution and a residue enriched in nickel and/or cobalt, alumina is recovered from the sodium aluminate solution as a solid and the remaining supernatant solution is recycled to the oxygen pressure leaching step wherein the alumina content of the aluminate solution is precipitated and a bleed for metals in the aluminate solution is provided.
4673431 FURNACE
DUST RECOVERY PROCESS
Francis H Bricmont assigned to Bricmont & Associates Inc A process for selective vaporization of oxides from recovered waste dust collected from a bag house. Pellets are formed from the waste dust and dried to permit charging in an oxidizing chamber wherein an oxidizing atmospheric is maintained. The chamber is heated to a temperature sufficient to vaporize lead oxide and, if present, also oxides of cadmium, potassium and sodium. The vapors are cooled and separated from furnace gas. The residual oxidized mass is cooled after removal from the oxidizing chamber and fed into a reduction chamber wherein a reducing atmosphere is maintained. The reduction chamber is heated to a temperature of between 1800 and 2000 degrees Fahrenheit to reduce zinc oxide and form zinc vapors which are cooled and separated from furnace gas. Lead oxide particles recovered from the oxidizing process are reduced to lead.
fluent of said mixture and bringing it into contact with baffles which are arcuately disposed in series so as to divert the gold onto collecting trays. The trays are disposed within a chamber in such manner as to create pathways for the effluent so that divergent streams of said effluent are directed to the baffles to enhance the recovery operation.
8703575 METHOD AND PLANT FOR THE RECOVERY OF ENERGY FROM WASTE AND RESIDUES Bernard NOBILET, Michel BONHOMME, Philippe DESPLAT, 10, le Petit Nice, F-13320 Bout Be1 Air, France assigned to PROPI0RG.A After screening, the residues are subjected to bacterial digestion in a methanisation reactor (105) and the solid phase of the digestate is then subjected to incineration in a furnace (116) which supplies a heat recuperator (119), the furnace being supplied with make-up fuel by the methane coming from the digester (105), whereas the circuit of fumes downstream of the recuperator (119) is used to heat by means of at least one secondary circuit (138, 139) the magma being processed in the digester and/or the slurry separated from the digestate before being recycled to the digester.
4676900 WATER TRAP SYSTEM FOR RECOVERING PRECIOUS METALS Jorge Masihy, Jose Navarrete
4673492 GOLD RECOVERY
APPARATUS
Hubert C Jasinski An apparatus for recovering gold from goldcontaining mixtures by forming a gaseous ef-
Disclosed is an apparatus for recovering solid particulates in liquid, typically water containing precious metal particles, such as is produced as a by-product of jewelry manufacture. The apparatus has a settling tank, which contains a fabric trap for entrapping very fine particles. Water in the tank is moved through the trap by a syphon producing a very small pressure gradient across the trap, which, because the pressure is so