US3802847A - Rotary furnace for carburization - Google Patents

Rotary furnace for carburization Download PDF

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Publication number
US3802847A
US3802847A US00187953A US18795371A US3802847A US 3802847 A US3802847 A US 3802847A US 00187953 A US00187953 A US 00187953A US 18795371 A US18795371 A US 18795371A US 3802847 A US3802847 A US 3802847A
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United States
Prior art keywords
rotary
furnace
powder
furnace according
rotary furnace
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Expired - Lifetime
Application number
US00187953A
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English (en)
Inventor
A Hara
M Miyake
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Filing date
Publication date
Priority claimed from JP45095243A external-priority patent/JPS504360B1/ja
Priority claimed from JP46071233A external-priority patent/JPS5110600B2/ja
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Application granted granted Critical
Publication of US3802847A publication Critical patent/US3802847A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/08—Rotary-drum furnaces, i.e. horizontal or slightly inclined externally heated
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/90—Carbides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/06—Rotary-drum furnaces, i.e. horizontal or slightly inclined adapted for treating the charge in vacuum or special atmosphere
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/42—Magnetic properties
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/80—Compositional purity
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/90—Other properties not specified above
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0006—Electric heating elements or system
    • F27D2099/0008—Resistor heating
    • 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
    • Y10S266/905—Refractory metal-extracting means

Definitions

  • An improved furnace of the rotating type comprises a rod-shaped or tubular heating core of graphite or carbonaceous material fixedly arranged in the central portion of the furnace.
  • a rotaryvcylinder having an inner wall of graphite or carbonaceous material is secured to rotate around the heating core.
  • a casing is provided with means for rotatably holding the rotary cylinder, an opening for feeding a raw material, means for supplying electric power, an opening for discharging a product and a gas flow opening and is secured to hold an atmosphere of carburization inside the furnace.
  • This invention relates to a furnace for carburization, and more particularly it is concerned with a rotary furnace for carburization, which is suitable for the production of carbides of elements of Groups lV-A, V-A and VI-A of Periodic Table, actinide elements, boron and silicon.
  • this method has a disadvantage that, since the reaction of forming these carbides is accompanied by the generation of heat, an abnormal generation of heat takes place in the lower portion of the boat, resulting in a localized grain growth, and the degree of cementation differs between the upper portion and lower portion of the boat in the carburization in hydrogen, being accompanied by cementation, resulting in unevenness of the quantity of carbon combined.
  • it is necessary to advance the reaction in a continuous manner with agitation of the reactants.
  • the accompanying drawings are to illustrate the principle and merits of the invention in more detail.
  • FIG. 1 shows schematically one form of the rotary furnace for carburization according to the invention.
  • FIG. 2. shows a cross sectional view of the furnace of 7 FIG. 1 at the central portion thereof.
  • heating core 1 Located at the center of furnace body 18 is heating core 1, around which rotating cylinderv 10 and fixed cylinder 11 are arranged.
  • FIG. 3 shows a dispersion of the quantity of carbon in tungsten carbide powder carburized by the prior art furnace.
  • a rotary furnace for carburization which comprises a rod-shaped or tubular heating core of graphite or carbonaceous material fixedly positioned in the central portion of the furnace, a rotary cylinder having an inner wall of graphite or carbonaceous material and positioned to rotate coaxially around the heating core, and a casing provided with means for rotatably supporting the rotary cylinder, an opening for feeding a raw material, means for supplying electric power, an opening for discharging a product and a gas flow opening and being constructed to maintain an atmosphere of carburization within the furnace.
  • the most important aspect of this furnace lies in that rotation of the rotary cylinder is independent of the fixed heating core and, consequently, sliding electrical contacts are unnecessary. Since the furnace'is of an internal heating type, an outer wall for shielding hydrogen gas can be kept at normal temperature by inserting a heat insulating mate rial between the inner and outer walls, and the problems of insulating materials can thus be solved.
  • the rotating cylinder is modified into a double structure of a rotating cylinder and fixed cylinder.
  • the fumace comprises a rod-shaped or tubular heating core of graphite or carbonaceous material fixedly positioned in the central portion of the furnace, a rotary cylinder having an inner wall of graphite or carbonaceous material and positioned to rotate coaxially around the heating core, a fixed cylinder fixedly positioned to surround the rotary cylinder, and a casing provided with means for rotatably supporting the rotary cylinder, means for fixedly supporting the fixed cylinder, an opening for feeding a raw material, means for supplying electric power, an opening for discharging a product, a gas flow opening, and being constructed to maintain an atmosphere of carburization with the furnace.
  • carbides of high melting point metals such as tungsten, titanium, tantalum, columbium, hafnium, zirconium, vanadium, chromium and molybdenum having a substantially stoichiometric amount of combined carbon and a very narrow grain size distribution are economically produced from the high melting point metals or oxides thereof.
  • high melting point metals such as tungsten, titanium, tantalum, columbium, hafnium, zirconium, vanadium, chromium and molybdenum having a substantially stoichiometric amount of combined carbon and a very narrow grain size distribution
  • the furnace is of the internal heating type with a heating core provided therein, it is relatively easy to maintain high temperatures, the raw material is directly exposed to the heat radiation from the heating core, and the furnace can be adapted for the continuous production of hard carbides without the us e of expensive heat insulating materials.
  • the heating core is fixedly arranged in the central portion of the furnace, the thermal efficiency is raised and a large electric current can be supplied independently of the rotating mechanism of the cylinder.
  • the cylinder is of a double structure of a rotary cylinder and fixed cylinder, rotation of the cylinder can smoothly be effected, and accordingly, feeding of powdered raw materials can be carried out corresponding to movement of the powder in the cylinder. Moreover, leakage of hydrogen gas can be prevented.
  • the furnace structure is so simple that the driving mechanism is composed of shafts only.
  • Reactants fed into the rotary furnace of the invention flow down between the inner wall and the heating core little by little in the form of powder or granules.
  • the diameter of the heating core and the inner diameter of the rotary cylinder may be varied with the quantity of reactants and reaction temperature. When it is further desired to increase the surface area of the heating core, it may be tubular shaped. Moreover, the inclination of the furnace body may be varied depending on the desired reaction speed.
  • carbon heating core 1 is fixed by copper electrode 2 and furnished with a large electric current through bus bar 3, which is fixed by insulator 4 and supported by metal fitting 5. Copper electrode 2 is cooled by water supplied by conduit 8.
  • Rotary cylinder or tube is located coaxially around heating core 1 and rotated within and in'contact with fixed cylinder or tube 1 1 and carbon ring 12. That is to say, rotary cylinder or tube.
  • furnace 10 is set by carbon ring 12 and moved in fixed cylinder or tube 11.
  • Fixed cylinder or tube 11 is positioned in the center of the furnace by carbon disk 13.
  • the driving mechanism of rotary cylinder 10 consists of stainless steel gears 14 supported by carbon bearings 15 and shafts 17 in gear box 16, the driving being effected through shafts 17.
  • the above mentioned mechanism is enclosed in furnace body or casing 18.
  • the space between fixed cylinder ll and furnace body 18 is filled with heat insulating material 19 so that the temperature of the central portion may be raised up to 2,200C.
  • l-Iydrogen gas enters hydrogen inlet 20 and leaves from hydrogen outlet 21.
  • Teflon 22 is used for the purpose of insulation and preventing leakage of hydrogen from around bus bar 3.
  • Furnace body 18 is provided with cooling water tube 23 on the outer surface thereof to prevent it from overheating.
  • carbon tube pyrometer 31 for measurement of the outer surface temperature of rotary cylinder 10 is positioned to extend through furnace body 18 and fixed cylinder 11.
  • Furnace body 18 is mounted on support frame 32 in such a manner that its inclination may be varied in accordance with the desired reaction speed.
  • a raw material powder is charged in hopper 24 from a feed opening (not shown) of hopper cover 25 and moved downwardly by screw 26 upon rotation of shaft 27.
  • EXAMPLE 2 Tungsten powder of 0.711. was mixed with 6.25 of carbon powder in a ball mill and the granulated powder having a grain size distribution of 1 mm to 0.02 mm was obtained. The resulting granulated powder was subjected to carburization reaction by the use of a rotary v furnace for carburization according to the invention as shown in FIGS. 1 and 2, to obtain WC powder.
  • the various conditions of the furnace are as follows:
  • WC powder was added 7 of cobalt powder and mixed with acetone for 100 hours in a ball mill having an inner diameter of 200 mmqb and cylinder length of 270 mm, followed by drying by heating at 100 C.
  • EXAMELE 4 inner diameter of rotary cylinder 80 mm Outer diameter of heating core 20 mmdz Inclination of furnace body 4 Rotation speed of rotary cylinder 2 rpm Flow rate of hydrogen l0 l/min Electric power 18 KW Carburization temperature
  • the reactants were fed to the furnace from the hopper at a rate of 10 kg/hr.
  • the so obtained WC powder had a total carbon quantity of 6.23 and free carbon quantity of 0.10 and the grain size distribution was much better than in the case of using a carburizing furnace of the prior art.
  • a TiC powder with a combined with 16 by weight of carbon powder and 2 by carbon of 19.5 was obtained without explosive reacweight of stearic acid in a ball mill, pressed in a mold tion ina yield of 98 under a pressure of 1 ton/cm and then crushed to give a powder having a grain size distribution of 2 mm to 0.2 Th h b i d Tic powder was i d i h 10 mm-
  • the resulting Powder was jecte to calbullzvar of nickel powder and 10 of molybdenum powder for tion in two steps by the use Of the rotary Car g 10 hours by means of a vibrating mill using balls each furnace of the invention.
  • the first step was carried out having a diameter of 10 mm and being a cermet ball at 1,400 C in nitrogen and the second step, at 1,800 and alcohol in an amount of two times the powder.
  • Various conditions of the furnace are mixed powder was pressed under a pressure of 2 shown in Table 4.
  • TiH powder was mixed with 21 powder was reacted at 2,000 C in hydrogen using the of carbon and 5 of stearic acid for 20 hours in a rotary furnace of the invention under the following ba11mi11, pressed in a mold and crushed to obtain a sizeconditions:
  • EXAMPLE 9 30 of tungsten powder, 22 of tantalum oxide (Ta O powder and 30 of titanium dioxide (TiO powder were mixed with 18 of carbon powder for 1 hour by means of a high speed mixer. The mixture was etone thereon. The thus granulated powder was subjected to carburization under the following conditions:
  • EXAMPLE 1 1 Inner diameter of rotary cylinder Heating core Inclination of furnace body 80 mm4 rod shaped, 20 mm 4 o Rotation speed 1 rpm Flow rate of hydrogen 5 l/min Whole length of rotating part 3 m The furnace, yielding the product at a rate of 5 kg/hr, was fit for use as a rotary furnace on a commercial scale.
  • Tantalum oxide (Ta O powder and 16 of powder were ball-milled, pressed and crushed to obtain a controlled grain size. The resulting powder was heated at 1,700 C in hydrogen by the use of the rotary furnace of the invention to give a TaC powder with a theoretical amount of combined carbon,-TC 6.30 and FC 0.1 1
  • the conditions of the furnace are as follows:
  • V 0 powder and 29 carbon powder were ball-milled, pressed and crushed to obtain a controlled grain size.
  • the resulting powder was a l 1 heated at 2,100 "C in hydrogen by the use of the rotary carburizing furnace to give a V C powder with a theoretical amount of carbon, TC 19.00 and FC 4.02
  • the conditions of the furnace are as follows:
  • a rotary furnace for carburization which comprises:
  • an enclosing casing constructed to maintain a carburization atmosphere within said furnace, said casing having an opening at the upper portion thereof for feeding a solid raw material therein, an opening at the lower portion thereof for discharging a carburized product therefrom, a gas feed inlet, a gas exhaust outlet, and being inclineable to provide a downward slope thereof;
  • a raw material feeding means communicating with said upper opening;
  • a product collecting means communicating with said lower opening;
  • I a rotary hollow cylinder of graphite or carbonaceous material having a large ratio of length to diameter, tubular supporting member means of graphite or carbonaceous material arranged in said enclosing casing, said rotary hollow cylinder being rotatably mounted on said supporting member means and having means to receive said raw material from said raw material feeding means and to discharge said carburized product to said product collecting means;
  • an elongated heating core of graphite or carbonaceous material fixedly positioned substantially coaxially at the center of said rotary cylinder;
  • said supporting member means is a fixed hollow cylinder of graphite or carbonaceous material having a slightly larger diameter than said rotary hollow cylinder, the inner periphery of said fixed hollow cylinder being in contact with the outer periphery of said rotary hollow cylinder, and said fixed hollow cylinder being fixed to said enclosing casing.
  • said electric power supplying means is a bus bar fixed by an insulator and supported by a metal fitting.
  • said gear mechanism comprises a plurality of gears and shafts supported by carbon bearings, one of said shafts being air-tightly connected to a power source outside said enclosing casing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
US00187953A 1970-10-30 1971-10-12 Rotary furnace for carburization Expired - Lifetime US3802847A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP45095243A JPS504360B1 (enExample) 1970-10-30 1970-10-30
JP46071233A JPS5110600B2 (enExample) 1971-09-16 1971-09-16

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US (1) US3802847A (enExample)
AU (1) AU458361B2 (enExample)
CA (1) CA958887A (enExample)
DE (1) DE2152717C3 (enExample)
FR (1) FR2110148A5 (enExample)
GB (1) GB1370652A (enExample)
IT (1) IT938624B (enExample)
SE (1) SE376965B (enExample)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3895174A (en) * 1974-06-04 1975-07-15 Lothar Jung Method and apparatus for conversion of crystalline silica raw materials into amorphous silica
US4200262A (en) * 1978-07-10 1980-04-29 College Research Corporation Method and apparatus for removing combustible material from metal scrap
US4292276A (en) * 1976-05-24 1981-09-29 Ibigawa Electric Industry Co., Ltd. Apparatus for producing silicon carbide
US5291876A (en) * 1991-10-07 1994-03-08 Astec Industries, Inc. Feed hopper for providing preheated aggregate material
US5358682A (en) * 1991-08-23 1994-10-25 Rogerson L Keith Method and apparatus for rotational application of polymers
US5380688A (en) * 1993-08-09 1995-01-10 The Dow Chemical Company Method for making submicrometer carbides, submicrometer solid solution carbides, and the material resulting therefrom
US5383981A (en) * 1993-06-14 1995-01-24 The United States Of America As Represented By The United States Department Of Energy Reusable crucible for containing corrosive liquids
US5718929A (en) * 1995-03-27 1998-02-17 Rogerson; L. Keith Rotational molding apparatus having fluid cooled arms
EP1079190A1 (en) * 1999-08-20 2001-02-28 Harper International Corp. Graphite rotary tube furnace
US6268590B1 (en) * 2000-03-06 2001-07-31 Summit Valley Equipment And Engineering, Corp. Apparatus and method for continuous retorting of mercury from ores and others mercury contaminated materials
US6271501B1 (en) * 1998-06-22 2001-08-07 Cabot Corporation High temperature rotating vacuum kiln and method for heat treating solid particulate material under a vacuum
US6380517B2 (en) * 1999-06-21 2002-04-30 Cabot Corporation High temperature rotating vacuum kiln and method for heat treating solid particulate material under a vacuum
WO2003074744A3 (en) * 2001-11-06 2003-12-31 Cerbide Method of making a ceramic body of densified tungsten carbide
US20040265208A1 (en) * 2003-04-25 2004-12-30 Zongtao Zhang Method for the production of metal carbides
WO2011044943A1 (de) * 2009-10-15 2011-04-21 Pyromex Holding Ag Hochtemperaturofen und verfahren zur umsetzung organischer materialien in synthesegas
CN104501580A (zh) * 2014-12-01 2015-04-08 咸阳华光窑炉设备有限公司 电加热超高温内热式回转窑炉
US20160264872A1 (en) * 2013-11-13 2016-09-15 Mitsubishi Heavy Industries Environmental & Chemical Engineering Co., Ltd. Externally heated carbonization furnace

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8708604D0 (en) * 1987-04-10 1987-05-13 Grieveson P Making carbides of high-melting metals
EP0746738A1 (en) * 1994-03-03 1996-12-11 Anglo American Corporation of South Africa Limited A furnace
BG64771B1 (bg) * 2000-09-27 2006-03-31 Димитър КРЪСТЕВ Метод за получаване на високотопими и твърди карбиди

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3895174A (en) * 1974-06-04 1975-07-15 Lothar Jung Method and apparatus for conversion of crystalline silica raw materials into amorphous silica
US4292276A (en) * 1976-05-24 1981-09-29 Ibigawa Electric Industry Co., Ltd. Apparatus for producing silicon carbide
US4200262A (en) * 1978-07-10 1980-04-29 College Research Corporation Method and apparatus for removing combustible material from metal scrap
US5358682A (en) * 1991-08-23 1994-10-25 Rogerson L Keith Method and apparatus for rotational application of polymers
US5291876A (en) * 1991-10-07 1994-03-08 Astec Industries, Inc. Feed hopper for providing preheated aggregate material
US5383981A (en) * 1993-06-14 1995-01-24 The United States Of America As Represented By The United States Department Of Energy Reusable crucible for containing corrosive liquids
US5380688A (en) * 1993-08-09 1995-01-10 The Dow Chemical Company Method for making submicrometer carbides, submicrometer solid solution carbides, and the material resulting therefrom
US5718929A (en) * 1995-03-27 1998-02-17 Rogerson; L. Keith Rotational molding apparatus having fluid cooled arms
US5728423A (en) * 1995-03-27 1998-03-17 Rogerson; L. Keith Method and apparatus for internally and externally coating enclosed metallic structures
US6271501B1 (en) * 1998-06-22 2001-08-07 Cabot Corporation High temperature rotating vacuum kiln and method for heat treating solid particulate material under a vacuum
US6380517B2 (en) * 1999-06-21 2002-04-30 Cabot Corporation High temperature rotating vacuum kiln and method for heat treating solid particulate material under a vacuum
EP1079190A1 (en) * 1999-08-20 2001-02-28 Harper International Corp. Graphite rotary tube furnace
US6268590B1 (en) * 2000-03-06 2001-07-31 Summit Valley Equipment And Engineering, Corp. Apparatus and method for continuous retorting of mercury from ores and others mercury contaminated materials
WO2003074744A3 (en) * 2001-11-06 2003-12-31 Cerbide Method of making a ceramic body of densified tungsten carbide
US20070235908A1 (en) * 2001-11-06 2007-10-11 Cerbide Corporation Method of making a ceramic body of densified tungsten carbide
US7309373B2 (en) 2001-11-06 2007-12-18 Cerbide Corporation Method of making a ceramic body of densified tungsten carbide
US20040265208A1 (en) * 2003-04-25 2004-12-30 Zongtao Zhang Method for the production of metal carbides
US7625542B2 (en) 2003-04-25 2009-12-01 Inframat Corporation Method for the production of metal carbides
WO2011044943A1 (de) * 2009-10-15 2011-04-21 Pyromex Holding Ag Hochtemperaturofen und verfahren zur umsetzung organischer materialien in synthesegas
US20160264872A1 (en) * 2013-11-13 2016-09-15 Mitsubishi Heavy Industries Environmental & Chemical Engineering Co., Ltd. Externally heated carbonization furnace
US10465119B2 (en) * 2013-11-13 2019-11-05 Mitsubishi Heavy Industries Environmental & Chemical Engineering Co., Ltd. Externally heated carbonization furnace
CN104501580A (zh) * 2014-12-01 2015-04-08 咸阳华光窑炉设备有限公司 电加热超高温内热式回转窑炉

Also Published As

Publication number Publication date
SE376965B (sv) 1975-06-16
GB1370652A (en) 1974-10-16
CA958887A (en) 1974-12-10
DE2152717A1 (de) 1972-05-10
AU458361B2 (en) 1975-02-27
DE2152717C3 (de) 1979-09-13
AU3511171A (en) 1973-05-03
FR2110148A5 (enExample) 1972-05-26
DE2152717B2 (de) 1979-01-18
IT938624B (it) 1973-02-10

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