US3124471A - Basic patching material for rotatable - Google Patents
Basic patching material for rotatable Download PDFInfo
- Publication number
- US3124471A US3124471A US3124471DA US3124471A US 3124471 A US3124471 A US 3124471A US 3124471D A US3124471D A US 3124471DA US 3124471 A US3124471 A US 3124471A
- Authority
- US
- United States
- Prior art keywords
- tar
- pitch
- weight
- lining
- dolomite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 title claims description 106
- 239000011295 pitch Substances 0.000 claims description 48
- 229910000514 dolomite Inorganic materials 0.000 claims description 40
- 239000010459 dolomite Substances 0.000 claims description 40
- 239000000126 substance Substances 0.000 claims description 10
- HHSPVTKDOHQBKF-UHFFFAOYSA-J calcium;magnesium;dicarbonate Chemical compound [Mg+2].[Ca+2].[O-]C([O-])=O.[O-]C([O-])=O HHSPVTKDOHQBKF-UHFFFAOYSA-J 0.000 claims 4
- 239000011269 tar Substances 0.000 description 66
- 239000011339 hard pitch Substances 0.000 description 18
- 239000000203 mixture Substances 0.000 description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 238000009835 boiling Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 238000004508 fractional distillation Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000001771 impaired Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- 235000011837 pasties Nutrition 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
- C21C5/441—Equipment used for making or repairing linings
- C21C5/443—Hot fettling; Flame gunning
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/013—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics containing carbon
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
Definitions
- the present invention relates to basic patching material for rotatable drum type furnaces.
- basic mixtures are employed which comprise primarily granulated sintered dolomite, and tar for steel making purposes as binding agent. These mixtures are pressed to bricks or are tamped into molds and are subsequently burned, or they are tamped into the cold furnace which is subsequently heated. When the mixture is being burned, the tar leaves a carbon skeleton which binds the dolomite grains to each other and fills in the interstices between the grains.
- the crude tar obtained from pit coal consists of a mixture of colloidal solutions of resins in oils of different boiling points and on an average contains 60% of pitch which is obtained as residue during the customary fractional distillation of the crude tar.
- a tar with a higher pitch content can be produced which tar also will have a higher viscosity.
- Such steel mill tar has proved particularly suitable which contains approximately from 60 to 65% pitch.
- the employment of tars with very high pitch content or of pitch for the manufacture of converter bottoms causes difliculties and leads to poor results.
- the heretofore known and employed lining material for converter bottoms have a tar content amounting to approximately from 7 to 9% by weight of the tardolomite mixture. Lining material with an essentially lower tar content, e. g. a tar content lower than 5%, resultsin a considerable impairment of the workability of the lining material and the resistance of the refractory lining.
- Lining materials with a tar content exceeding the amount of approximately are not usable inasmuch as they are too pasty and, when being burned, easily cause the separation of oil and thereby bring about an increased formation of pores.
- the repair work is particularly impaired by' the fact that the drum type furnace rotates about its horizontal axis during the repair of the cylindrical furnace lining, and by the fact that the patching material deposited on the damaged portion may drop off due to the force of gravity, i.e. its weight, before a consolidation and binding with the base material has occurred.
- Example I indicates the composition of the heretofore known tar-dolomite lining material
- Examples II and III show the compositions of a lining material according to the invention. All examples are based on a medium pitch content in the tar of 60% by weight.
- Example I A material composed of 9% by weight of tar (with 60% pitch) and 91% by weight of dolomite.
- the patching material contains 5.4% by weight of pitch.
- Example II The material consists of 9% by weight of tar (with 60% pitch), 8% by weight of hard pitch, 83% by weight of dolomite.
- Example 111 Patented Mar. 10, 1964 i
- the patching material will, even with a high addition of hard pitch, have a granular friable character, it can without difiiculty manually' or automatically be deposited on the damaged portions.
- the binding of the patching material to the drum lining is effected at such a speed that the patching material will not drop off when the drum type furnace rotates during the repair Work.
- a basic lining material for repairing the refractory lining of rotary drum furnaces in hot condition which consists essentially of dolomite and a bonding substance the latter consisting essentially of tar containing 60 to 65% pitch, said tar being in amount ranging from 5 to l 11% by weight of said dolomite, and hard pitch to the extent that the total pitch content of the lining material is from 7 to 25 by Weight of said lining material, said lining material being in a granular friable condition.
- a basic lining material for repairing the refractory lining of rotary drum furnaces in hot condition which consists essentially of dolomite and a bonding substance the latter consisting essentially of tar containing 60 to 65 pitch, said tar being in amount ranging from 5 to l l% by Weight of said dolomite, and hard pitch to the extent of from 10 to 18% by Weight of said lining material, said llining material being in a granular friable condition.
- a basic lining material for repairing the refractory lining of rotary drum furnaces in hot condition which consists essentially of approximately 83% by weight of dolomite, approximately 9% by Weight of tar with a pitch content of approximately 60% by weight, and approximately 8% by Weight of hard pitch.
- a basic lining material for repairing the refractory lining of rotary drum furnaces in hot condition which consists essentially of approximately 73% by weight of dolomite, approximately 8% by' Weight of tar with a pitch content of approximately 60 by weight, and approximately 19% by weight of hard pitch.
Description
3 124 471 BASIC PATCHING MATERIAL non ROTATABLE DRUM TYPE FURNACES.
Edgar Spetzler and Josef Auer, Oberhansen, Germany, assignors to Hiittenwtcrk ()berhausen Aktiengesellschaft, Oherhausen, Germany No Drawing. Filed Nov. 30, 1060, Ser. No. 72,560
Claims priority, application Germany Dec. 21, 1959 4 Claims. (Cl. 106-58) The present invention relates to basic patching material for rotatable drum type furnaces.
As refractory lining for industrial furnaces, melting furnaces or the like, especially for converter bottoms, basic mixtures are employed which comprise primarily granulated sintered dolomite, and tar for steel making purposes as binding agent. These mixtures are pressed to bricks or are tamped into molds and are subsequently burned, or they are tamped into the cold furnace which is subsequently heated. When the mixture is being burned, the tar leaves a carbon skeleton which binds the dolomite grains to each other and fills in the interstices between the grains.
The crude tar obtained from pit coal consists of a mixture of colloidal solutions of resins in oils of different boiling points and on an average contains 60% of pitch which is obtained as residue during the customary fractional distillation of the crude tar. By partially driving out low boiling oils from the crude tar, a tar with a higher pitch content can be produced which tar also will have a higher viscosity. 'For the production of resistant converter bottoms, such steel mill tar has proved particularly suitable which contains approximately from 60 to 65% pitch. Experience has proved that the employment of tars with very high pitch content or of pitch for the manufacture of converter bottoms causes difliculties and leads to poor results.
Already tars with a pitch content exceeding 68% are too viscous for being processed and yield no improvement in the resistance of the lining.
The heretofore known and employed lining material for converter bottoms have a tar content amounting to approximately from 7 to 9% by weight of the tardolomite mixture. Lining material with an essentially lower tar content, e. g. a tar content lower than 5%, resultsin a considerable impairment of the workability of the lining material and the resistance of the refractory lining.
Lining materials with a tar content exceeding the amount of approximately are not usable inasmuch as they are too pasty and, when being burned, easily cause the separation of oil and thereby bring about an increased formation of pores.
It is known for purposes of patching brickwork of industrial furnaces to employ lining material having a tar content of approximately from 7 to 9% and a pitch content in the tar of approximately from 60 to 65%. In this connection, the patching material is tamped onto the damaged portion and is burned at a temperature up to 500 C. If this temperature is exceeded, it cannot be assured any longer that the patching material will satisfactorily bind with the base material or that a higher proportion of the tar of the patching material will not burn already when the patching material is introduced into the furnace. Damaged portions in the lining of hearth type furnaces have been repaired by throwing the patching material by hand or by centrifuges into the hot furnace having a temperature exceeding 500 C. Due to the penetration of slag into the patching material, eventually in the course of time a sufiicient consolidation of the patching material and a binding with the base material occurs.
Such methods are, however, not usable when repairing United States, Patent M damaged portions in the lining of cylindrical drum type furnaces which rotate about their horizontal axis during their operation. For economic reasons, it is not permissible with each required repair to wait till the drum type furnace has cooled down to a temperature below 500 C. because such waiting period would result in a long standstill of the furnace and in intolerable losses in production. The repair of the lining of a drum type furnace must, therefore, be carried out at a temperature in excess of 600 C. At such high temperatures, the heretofore known tar-dolomite lining material is not adapted sufficiently to sinter because a great portion of the tar will burn prematurely. The repair work is particularly impaired by' the fact that the drum type furnace rotates about its horizontal axis during the repair of the cylindrical furnace lining, and by the fact that the patching material deposited on the damaged portion may drop off due to the force of gravity, i.e. its weight, before a consolidation and binding with the base material has occurred.
When employing a basic lining material for repairing the refractory lining of drum type furnaces, which lining contains dolomite and tar in a quantity from 5% to ll% by weight of the dolomite, the above mentioned drawbacks will in conformity with the present invention be avoided by employing a lining material with such an addition of hard pitch that the total pitch content of the lining material will amount to from 7 to approximately 25% by weight, preferably from 10 to 18% by weight of the lining material. The invention is more fully explained in connection with the following numerical examples. Example I indicates the composition of the heretofore known tar-dolomite lining material, whereas Examples II and III show the compositions of a lining material according to the invention. All examples are based on a medium pitch content in the tar of 60% by weight.
Example I A material composed of 9% by weight of tar (with 60% pitch) and 91% by weight of dolomite.
kilograms of material contain Kilograms Dolomite 9-1 Pitch from tar 5.4 Pitch-free tar substance 3.6
The patching material contains 5.4% by weight of pitch.
Example II The material consists of 9% by weight of tar (with 60% pitch), 8% by weight of hard pitch, 83% by weight of dolomite.
:100 kilograms of material contain Kilograms Dolomite 83 Hard pitch 8 Pitch from tar 5.4 Pitch-free tar substance 3.6
The patching material contains 8+5.4=13.4% by weight pitch.
Example 111 Patented Mar. 10, 1964 i The patching material contains l9+4.8=23.8% by weight of pitch.
Experience has shown that the repair of the lining of rotatable drum furnaces by means of patching material having its pitch content increased in conformity with the present invention to from 7 to 25% by admixing hard pitch to a tar-dolomite mixture, will have considerable advantages. Although a portion of the tar will burn While the patching material is being introduced into the furnace, the carbon content of the patching material is sufliciently high so that during the burning of the patching material a still resistant carbon skeleton will form between the dolomite grains. The repair Work may be carried out in the rotatable drum furnace at temperatures exceeding 600 C. Inasmuch as the patching material will, even with a high addition of hard pitch, have a granular friable character, it can without difiiculty manually' or automatically be deposited on the damaged portions. The binding of the patching material to the drum lining is effected at such a speed that the patching material will not drop off when the drum type furnace rotates during the repair Work.
It is, of course, to be understood that the present invention is, by no means, limited to the specific examples referred to above but also comprises any modifications within the scope of the appended claims.
What we claim is:
1. A basic lining material for repairing the refractory lining of rotary drum furnaces in hot condition, which consists essentially of dolomite and a bonding substance the latter consisting essentially of tar containing 60 to 65% pitch, said tar being in amount ranging from 5 to l 11% by weight of said dolomite, and hard pitch to the extent that the total pitch content of the lining material is from 7 to 25 by Weight of said lining material, said lining material being in a granular friable condition.
2. A basic lining material for repairing the refractory lining of rotary drum furnaces in hot condition, which consists essentially of dolomite and a bonding substance the latter consisting essentially of tar containing 60 to 65 pitch, said tar being in amount ranging from 5 to l l% by Weight of said dolomite, and hard pitch to the extent of from 10 to 18% by Weight of said lining material, said llining material being in a granular friable condition.
3. A basic lining material for repairing the refractory lining of rotary drum furnaces in hot condition, which consists essentially of approximately 83% by weight of dolomite, approximately 9% by Weight of tar with a pitch content of approximately 60% by weight, and approximately 8% by Weight of hard pitch.
4. A basic lining material for repairing the refractory lining of rotary drum furnaces in hot condition, which consists essentially of approximately 73% by weight of dolomite, approximately 8% by' Weight of tar with a pitch content of approximately 60 by weight, and approximately 19% by weight of hard pitch.
Sejersted et a1. Sept. 29, 1953 Martinet June 28, 1960
Claims (1)
1. A BASIC LINING MATERIAL FOR REPAIRING THE REFRACTORY LINING OF ROTARY DRUM FURNACES IN HOT CONDITION, WHICH CONSISTS ESSENTIALLY OF DOLOMITE AND A BONDING SUBSTANCE THE LATTER CONSISTING ESSENTIALLY OF TAR CONTAINING 60 TO 65% PITCH, SAID TAR BEING IN AMOUNT RANGING FROM 5 TO 11% BY WEIGHT OF SAID DOLOMITE, AND HARD PITCH TO THE EXTENT THAT THE TOTAL PITCH CONTENT OF THE LINING MATERIAL IS FROM 7 TO 25% BY WEIGHT OF SAID LINING MATERIAL, SAID LINING MATERIAL BEING IN A GRANULAR FRIABLE CONDITION.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3124471A true US3124471A (en) | 1964-03-10 |
Family
ID=3453906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US3124471D Expired - Lifetime US3124471A (en) | Basic patching material for rotatable |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3124471A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3310415A (en) * | 1965-05-13 | 1967-03-21 | Baker Co J E | Refractory material |
| US3340075A (en) * | 1964-12-16 | 1967-09-05 | Cabot Corp | Tar-bonded refractories containing pine tar |
| US3376040A (en) * | 1964-01-16 | 1968-04-02 | Olin Mathieson | Compacted frangible target of agglomerated particulate material |
| US3382084A (en) * | 1964-12-11 | 1968-05-07 | Union Oil Co | Asphalt binder pitch |
| US3399255A (en) * | 1966-08-01 | 1968-08-27 | Olin Mathieson | Method for producing projectable targets |
| FR2086417A1 (en) * | 1970-04-28 | 1971-12-31 | Koninklijke Hoogovens En Staal | |
| US4390166A (en) * | 1978-05-29 | 1983-06-28 | Shinagawa Refractories Co., Ltd. | Hot-gunning method for repairing converters |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2653878A (en) * | 1948-11-20 | 1953-09-29 | Elektrokemisk As | Process for the production of electrodes |
| US2943240A (en) * | 1959-04-06 | 1960-06-28 | Kaiser Aluminium Chem Corp | Furnace structures |
-
0
- US US3124471D patent/US3124471A/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2653878A (en) * | 1948-11-20 | 1953-09-29 | Elektrokemisk As | Process for the production of electrodes |
| US2943240A (en) * | 1959-04-06 | 1960-06-28 | Kaiser Aluminium Chem Corp | Furnace structures |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3376040A (en) * | 1964-01-16 | 1968-04-02 | Olin Mathieson | Compacted frangible target of agglomerated particulate material |
| US3382084A (en) * | 1964-12-11 | 1968-05-07 | Union Oil Co | Asphalt binder pitch |
| US3340075A (en) * | 1964-12-16 | 1967-09-05 | Cabot Corp | Tar-bonded refractories containing pine tar |
| US3310415A (en) * | 1965-05-13 | 1967-03-21 | Baker Co J E | Refractory material |
| US3399255A (en) * | 1966-08-01 | 1968-08-27 | Olin Mathieson | Method for producing projectable targets |
| FR2086417A1 (en) * | 1970-04-28 | 1971-12-31 | Koninklijke Hoogovens En Staal | |
| US4390166A (en) * | 1978-05-29 | 1983-06-28 | Shinagawa Refractories Co., Ltd. | Hot-gunning method for repairing converters |
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