Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
  • F27D13/002—Preheating scrap
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
  • B03B9/00—General arrangement of separating plant, e.g. flow sheets
  • B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
  • B03B9/061—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse the refuse being industrial
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
  • C22B1/00—Preliminary treatment of ores or scrap
  • C22B1/005—Preliminary treatment of scrap
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
  • C22B21/00—Obtaining aluminium
  • C22B21/0007—Preliminary treatment of ores or scrap or any other metal source
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
  • F23G2201/00—Pretreatment
  • F23G2201/50—Devolatilising; from soil, objects
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
  • F23G2900/00—Special features of, or arrangements for incinerators
  • F23G2900/52002—Rotary drum furnaces with counter-current flows of waste and gas
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P10/00—Technologies related to metal processing
  • Y02P10/20—Recycling
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S266/00—Metallurgical apparatus
  • Y10S266/901—Scrap metal preheating or melting

Definitions

• This invention relates to apparatus for heat processing scrap materials in the recovery of their useful constituents and removal as by vapourization or burning of contaminants such as lacquer or paint coatings.
• the invention is particularly but not exclusively applicable to scrap metal materials, for example in the recycling of metal containers typically aluminium or aluminium alloy beverage cans.
• the object of the present invention is to provide heat processing apparatus for the above purpose, e.g. incorporating a rotary kiln, which is economical to manufacture and install, compact, adaptable in design, and affective and efficient in operation.
• apparatus for heat processing scrap material to separate contaminants therefrom comprising a kiln defining an enclosed furnace chamber having a feed path extending therethrough along which a flow of the mater.- al is passed in use between material input and ma-erial output ends of the chamber: and gas circulation means for providing a flow of heated gases through the chamber to act on said flow of material in use: characterised in that said circulation means includes an inlet duct extending into the kiln from the material input end and opening into the chamber adjacent the output end, and an outlet flue opening from the chamber at said input end whereby the flow of gases within the chamber acting directly on the material is in the opposite direction of travel to the passage of the material along said path, and those parts of the gas circulation means which are outside the kiln are all located at or adjacent to the material input end thereof
• the kiln is a rotary kiln centered on an inclined axis and the inlet duct is disposed co axially therein. Said duct may rotate in common with the kiln.
• Said gas circulation means may include a recirculation connection externally of the kiln and at or adjacent said input end thereof for operative recirculation of at least part of the gases exhausted from the furnace through the outlet flue.
• Said circulation means may further include flow inducing means for forced movement of gases through the furnace: control means for regulating the operating temperature of the gases an after burner for high temperature disposal or breaking down of the contaminant content of the gases so exhausted at a higher temperature than the operating temperature within the chamber; and/or cooling means acting on the gases fed to the inlet duct to reduce their temperature to a predetermined level.
• the apparatus comprises a rotary kiln 10 defining an enclosed furnace chamber 12.
• the axis of the kiln is inclined so that it slopes downwardly from its material input end 14 to its material output end 16 i.e. from left to right as viewed in the drawing.
• the extremities of the rotating kiln being provided with airtight seals 13.20 connecting it with respective non-rotating upper and lower enclosure formations 22.24 at said respective endc in conventional manner .
• the scrap material is fed into the chamber from a hopper or the like (not shown) through a delivery chute 26 opening into inlet end 14 to pass along a feed path through the rotating kiln, exiting from a discharge chute 28 at the output end 16 to drop onto a conveyor 30.
• Gas circulation means of the apparatus comprises an inlet duct 32 extending co-axially of chamber 12 through the rotating kiln 10 to open into said chamber within closure formation 24 i.e. at the material output end of the chamber.
• Duct 32 is conveniently mounted for rotation with kiln 10, its upper end opening through the end wall of the closure formation 22 at the material input end of the chamber by way of a further airtight seal 34.
• Heated gases at controlled temperature are fed into duct 32 from an ante-chamber 36 defined by fixed structure of the gas circulation means all of which is at or immediately adjacent to said material input end 14.
• the gas flow within chamber 12 is operated at negative pressure, i.e. less than ambient atmospheric pressure in the manner described in our said co-pending application GB-A-2229801 to avoid any escape of contaminated gases e.g. if there should be any leakage past the various seals.
• Said negative pressure is induced by a centrifugal fan 38 in an outlet flue 40 opening from the top of closure formation 22 at the material input end 14 of chamber 12
• Flue 40 opens into the upper end of a vertical after burner chamber 42 disposed alongside ante-chamber 36 and containing a gas fuelled or other burner head 44, the temperature in chamber 42 being such that the lacquer and other contaminant content of the exhaust gases is further broken down at a higher temperature than that in the kiln chamber 12.
• the gases exiting from the bottom of chamber 42 pass into the ante-chamber 36, a proportion thereof being recirculated through the kiln chamber 12 as described above and a proportion being led off from ante ⁇ chamber 36 through a branch duct 46 for after-treatment and eventual disposal. Provision (not shown) may be made for cooling the gases fed into furnace chamber 12.
• Delivery chute 26 is preferably arranged so that the material passing therethrough is preheated, e.g. in part by radiant heat from the upper end of inlet duct 32. for drying the material and raising its temperature before it enters the chamber 12, again providing increased efficiency of operation and minimising heat loss.
• Control means are provided for monitoring and regulating the operating temperatures in chamber 12 and elsewhere, regulating the flow rate of the gases etc as described in our said application G3-A-2229801.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Geology (AREA)
• Manufacturing & Machinery (AREA)
• Life Sciences & Earth Sciences (AREA)
• Environmental & Geological Engineering (AREA)
• Metallurgy (AREA)
• General Engineering & Computer Science (AREA)
• Muffle Furnaces And Rotary Kilns (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
• General Preparation And Processing Of Foods (AREA)
• Furnace Details (AREA)
• Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10697519

Family Applications (1)

Country Status (12)

Families Citing this family (15)

Citations (4)

Family Cites Families (9)

• 0
  • TW TW081105641A patent/TW221462B/zh active
• 1991
  • 1991-06-28 GB GB9114030A patent/GB2257239B/en not_active Expired - Fee Related
• 1992
  • 1992-06-19 CA CA 2112249 patent/CA2112249C/en not_active Expired - Fee Related
  • 1992-06-19 DK DK92305638T patent/DK0523858T3/da active
  • 1992-06-19 ES ES92305638T patent/ES2094296T3/es not_active Expired - Lifetime
  • 1992-06-19 AU AU20214/92A patent/AU666315B2/en not_active Ceased
  • 1992-06-19 DE DE69215284T patent/DE69215284T2/de not_active Expired - Lifetime
  • 1992-06-19 AT AT92305638T patent/ATE145434T1/de not_active IP Right Cessation
  • 1992-06-19 EP EP92305638A patent/EP0523858B1/en not_active Expired - Lifetime
  • 1992-06-19 US US08/167,998 patent/US5451033A/en not_active Expired - Lifetime
  • 1992-06-19 WO PCT/GB1992/001120 patent/WO1993000450A1/en not_active Ceased
• 1997
  • 1997-02-12 GR GR960403333T patent/GR3022514T3/el unknown

Patent Citations (4)

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