US3725038A - Process for making polygon coke in coking chambers and coke so produced - Google Patents
Process for making polygon coke in coking chambers and coke so produced Download PDFInfo
- Publication number
- US3725038A US3725038A US00107231A US3725038DA US3725038A US 3725038 A US3725038 A US 3725038A US 00107231 A US00107231 A US 00107231A US 3725038D A US3725038D A US 3725038DA US 3725038 A US3725038 A US 3725038A
- Authority
- US
- United States
- Prior art keywords
- coke
- coal
- iron ore
- percent
- weight
- 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
- 239000000571 coke Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004939 coking Methods 0.000 title abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 48
- 239000003245 coal Substances 0.000 abstract description 33
- 229910052742 iron Inorganic materials 0.000 abstract description 24
- 239000011872 intimate mixture Substances 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 13
- 239000008188 pellet Substances 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000000470 constituent Substances 0.000 description 4
- 229910052595 hematite Inorganic materials 0.000 description 4
- 239000011019 hematite Substances 0.000 description 4
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 4
- 238000011049 filling Methods 0.000 description 2
- 238000005453 pelletization Methods 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- ZEKANFGSDXODPD-UHFFFAOYSA-N glyphosate-isopropylammonium Chemical compound CC(C)N.OC(=O)CNCP(O)(O)=O ZEKANFGSDXODPD-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011369 resultant mixture Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/08—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form in the form of briquettes, lumps and the like
-
- 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
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
Definitions
- a process for producing coke in polygonal shape in indirectly heated coke oven chambers which comprises applying to shaped pieces of fine-grained, including pelleti'zed or briquetted, coal, an intimate mixture of size, thereby forming a shell on said pieces before subjecting them to the coking operation.
- the grain size of the coal and the iron ore are below 1 mm, the ratio of coal to iron ore in the shell 33% by weight: 67 percent by weight.
- the invention also comprises the polygonal coke made coal and iron ore, both of fine grainm H /0 4 4W 9/ M 1 0 m ,A 7 MCI 6 mm s 7.n.
- the present invention relates to a process for making polygon coke in heated chambers from pieces of coal.
- the special method leading to such formation consists in applying a thin outer layer of hematitic iron ore to pieces of coal to be coked which contains l8 to 38 percent by weight of volatile constituents or to pelletized or briquetted pieces of fine-grained coal, and then converting the pieces so prepared to a normal coking process; in a preferred embodiment of the process, the pieces to be coked are in the shape of shell pellets.
- the invention is based on the surprising discovery that it is possible to produce polygon coke when using much smaller quantities of iron ore and yet have the desired separating effect at the surface between the individual pieces of coke, by using as separating layers not pure iron ore, as up to now, but by employing a mixture of fine coal and fine ore; it is an added advantage that the fine coal used in the mix can be the same, as a rule, as the one from which the coke is to be produced.
- FIG. 1 shows, in section, a fragment of a filling for a coke oven chamber as introduced into a chamber
- FIG. 2 illustrates the filling after coking according to the invention has taken place.
- water is added to the coal in an amount which is sufficient for starting the formation of pellets as soon as the coal particles are placed in a pelletizing dish or drum. This amount of water is slightly below the one at which a paste would form; about 8 percent by weight is a good quantity for the initial wetting of the coal.
- pellets will be automatically formed. During this operation, more water is sprayed onto the pellets under formation, so that the final water content will be about 16 percent by weight.
- the pellets have a diameter of 30-40 mm.
- Fine coal of the same type as described above having a mean grain size below 1 mm was intimately mixed with 65 percent by weight of hematite, likewise having a grain size below 1 mm.
- the ratio of coal ore in the mix was 33 67 by weight.
- a mixture of hematite with magnesite or with hydroxides will be satisfactory.
- This mixture of coal and ore is then pelletized onto the coal pellets. This is done by using a rimmed pelletizing dish, the rim of which is filled with the mixture above described, and there the coal pellets are rolled until a shell is formed thereon of the mixture. In order to make the mixture adhere to the coal pellets, some more water is sprayed into the mixture. The amount of water should again be about 16% by weight of the orecoal mixture, so that the outer shell and the pellet coated thereby will have the same water content.
- the shell applied is of a thickness which will cause a content of iron ore to be 2.5 percent by weight distributed throughout the finished piece.
- the process of the invention permits to obtain polygon coke with very low ore contents and, moreover, it makes it possible to recover a large part of the added ore in the form of iron sponge. Since it is the main object of the process to make coke for blast furnaces, not even the iron or iron ore remaining in the coke is to be considered a loss.
- the iron in the polygon coke is obtained from the blast furnace as pig iron. Any iron contained in small coke pieces below 30 mm grain size is likewise recovered in a sintering plant and therefore not lost in the metallurgical process.
- Process for producing coke in more or less regular polygon shape at least a major portion of which have a diameter of from about 40 to about 60 mm, which comprises (a) mixing together intimately fine grains of coal and hematite iron ore, said grains being below 1 mm, (b) applying the resultant mixture of fine grains of coal and iron ore to the outer surface of coal shapes which have been compacted of fine grains of coal and which contain from about 18 percent to about 38 percent by weight of volatile constituents, (c) thereafter heating the so-obtained shapes with coal-ore mixture coated thereon at coking temperature in an oven for a time sufficient to form substantially regular polygons of coke, and (d) removing and recovering the polygon shaped coke from the coking oven, the ratio of coal to iron ore in the mixture of step (b) being in the range of about 33 to 67 percent (by weight), and the thickness of the outer coating of said mixture on the coal shapes being such as to result in a weight of about 2.5 percent iron ore in the resultant polygonal co
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Coke Industry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
A process for producing coke in polygonal shape in indirectly heated coke oven chambers which comprises applying to shaped pieces of fine-grained, including pelletized or briquetted, coal, an intimate mixture of coal and iron ore, both of fine grainsize, thereby forming a shell on said pieces before subjecting them to the coking operation. Preferably, the grain size of the coal and the iron ore are below 1 mm, the ratio of coal to iron ore in the shell 33% by weight: 67 percent by weight. The invention also comprises the polygonal coke made by the process.
Description
[ 51 Apr. 3, 1973 United States Patent [1 1 Wenzel et a1.
2,127,632 8/1938 Najarian..,................................. 2,805,141 9/1957 Apull.... 2,411,873 12/1946 I 2,052,329
[54] PROCESS FOR MAKING POLYGON COKE IN COKING CHAMBERS AND COKE SO PRODUCED 8/1936 Wendeborn................................75/3
Heitmann et a1...........................75/3
....75/3 Price m t e n O S n a H 54 66 99 11 l/ 11 ll 69 31 93 6 33 .9f ko c l e z c u 3 n m d a0 H m e uh nfl W W. m en'- "-I I. 9 w" s r- 0 t n e V n 1 l 5 7 1 Aachen, Germany said Wenzel and Schenck, by said Gudenau Primary Examiner-Murray Katz [73] Assignee:
Assistant Examiner-William R. Trenor AttorneyMcGlew and Toren [22] Filed: Jan. 18, 1971 [21] Appl. No.: 107,231
ABSTRACT [30] Foreign Application Priority Data Apr. 14, 1970 Germany....................
A process for producing coke in polygonal shape in indirectly heated coke oven chambers which comprises applying to shaped pieces of fine-grained, including pelleti'zed or briquetted, coal, an intimate mixture of size, thereby forming a shell on said pieces before subjecting them to the coking operation. Preferably, the grain size of the coal and the iron ore are below 1 mm, the ratio of coal to iron ore in the shell 33% by weight: 67 percent by weight. The invention also comprises the polygonal coke made coal and iron ore, both of fine grainm H /0 4 4W 9/ M 1 0 m ,A 7 MCI 6 mm s 7.n. m2 "4 I "5 m7 M3 I m5 7 .1 M 4 5 .U N 5 l [51] Int. Cl............C21b 1/10, 1301] 2/12, C22b 1/14 [58] Field of Search 17/46, 100 A, 100 B; 44/6, 44/10, 14; 75/3, 4, 42; 201/5 References Cited UNITED STATES PATENTS by the process.
2 Claims, 2 Drawing Figures I Von PATENTEnAPRs I975 F l G. 2
IN VE/V TORS' mm L wHH
ATTORNEYS PROCESS FOR MAKING POLYGON COKE IN COKING CHAMBERS AND COKE SO PRODUCED SUMMARY OF THE INVENTION The present invention relates to a process for making polygon coke in heated chambers from pieces of coal.
In a known process (US. patent application, Ser. No. 65,935 filed Aug. 21, 1970 it has been described that in conventional, indirectly heated coke oven chambers a coke of substantially even size may be obtained, where the pieces have the form of more or less regular polygons with distinctly planar shape. The resulting form is due to a special process of coke formation.
The special method leading to such formation consists in applying a thin outer layer of hematitic iron ore to pieces of coal to be coked which contains l8 to 38 percent by weight of volatile constituents or to pelletized or briquetted pieces of fine-grained coal, and then converting the pieces so prepared to a normal coking process; in a preferred embodiment of the process, the pieces to be coked are in the shape of shell pellets.
It is, however, a considerable drawback of the known coking process that on the one hand, large quantities of iron ore are necessary, in order to produce a sufficiently marked separating effect between the individual polygons after the coke has been removed from the GENERAL DESCRIPTION OF THE INVENTION structures 5 coated by shells 6. The interstices have dischamber and that, on the other hand, the layers of iron ore on the pieces of coke incur the risk of an early wearing away of the chamber walls. With normal coal for coking, i.e. a coal having a mean content of about 24 percent by weight of volatile constituents, and with pieces of coke intended to have the size of about'40-60 mm, good separating effects could only be accomplished when more than 10 percent of ore were pelletized onto the pieces.
It is an object of the present invention to provide a process which is free from the drawbacks of the known method in the preparation of polygon coke.
It is another object of the invention to provide a process which leads to satisfactory pieces of polygonal coke without the use of the large amounts of iron ore hitherto necessary for the separating effect.
Other objects and advantages of the process according to the invention will become apparent from the following detailed description and the accompanying drawings.
The invention is based on the surprising discovery that it is possible to produce polygon coke when using much smaller quantities of iron ore and yet have the desired separating effect at the surface between the individual pieces of coke, by using as separating layers not pure iron ore, as up to now, but by employing a mixture of fine coal and fine ore; it is an added advantage that the fine coal used in the mix can be the same, as a rule, as the one from which the coke is to be produced.
In the accompanying drawing, the structure of the polygon coke is schematically illustrated.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows, in section, a fragment of a filling for a coke oven chamber as introduced into a chamber; and
FIG. 2 illustrates the filling after coking according to the invention has taken place.
appeared.
In the following example, the process of the invention will be described in greater detail, but it should be understood that the example is given by way of illustration and not of limitation and that many changes in the details may be made without departing from the spirit of the invention.
EXAMPLE Coal used conventionally in the production of blast furnace coke and having a mean content of 24 percent by weight of volatile constituents, was comminuted to a grain size of below about 1 mm, which is the size coal usually assumes when being ground; about 15-25 percent had the size of 0.09 mm, about 60 percent from 0.1-0.2 mm. In order to shape pellets, water is added to the coal in an amount which is sufficient for starting the formation of pellets as soon as the coal particles are placed in a pelletizing dish or drum. This amount of water is slightly below the one at which a paste would form; about 8 percent by weight is a good quantity for the initial wetting of the coal. As the dish or drum rotates, pellets will be automatically formed. During this operation, more water is sprayed onto the pellets under formation, so that the final water content will be about 16 percent by weight. The pellets have a diameter of 30-40 mm.
Fine coal of the same type as described above having a mean grain size below 1 mm was intimately mixed with 65 percent by weight of hematite, likewise having a grain size below 1 mm. The ratio of coal ore in the mix was 33 67 by weight. Instead of pure hematite, a mixture of hematite with magnesite or with hydroxides will be satisfactory.
This mixture of coal and ore is then pelletized onto the coal pellets. This is done by using a rimmed pelletizing dish, the rim of which is filled with the mixture above described, and there the coal pellets are rolled until a shell is formed thereon of the mixture. In order to make the mixture adhere to the coal pellets, some more water is sprayed into the mixture. The amount of water should again be about 16% by weight of the orecoal mixture, so that the outer shell and the pellet coated thereby will have the same water content. The shell applied is of a thickness which will cause a content of iron ore to be 2.5 percent by weight distributed throughout the finished piece.
These shell pellets were then coked in a cylindrical chamber having a diameter of 38 cm and a height of 65 cm. About 2000 pellets of size 30-40 mm are charged at one time for coking. The temperature was maintained at about 1 C, the coking time 12 hours.
Grain analysis of the coke produced was as shown below:
O-Smm 5 H) mm 0.4% 30 mm l.2% 30 60 mm 68.5% over 60 mm 20.2% total l00.0%
In a rattler test the polygon coke with grain size above 40 mm was 88.4 percent at 100 drum revolutions.
it was further found that the bulk of the added ore, namely 75 percent, was contained in the smallest fraction with grain size below 5 mm. From there, a considerable amount of the iron used can be recovered by magnetic separation.
As seen from the example, the process of the invention permits to obtain polygon coke with very low ore contents and, moreover, it makes it possible to recover a large part of the added ore in the form of iron sponge. Since it is the main object of the process to make coke for blast furnaces, not even the iron or iron ore remaining in the coke is to be considered a loss. The iron in the polygon coke is obtained from the blast furnace as pig iron. Any iron contained in small coke pieces below 30 mm grain size is likewise recovered in a sintering plant and therefore not lost in the metallurgical process.
It is of great importance that by the admixture of large amounts of coal to the iron ore, before application of the shell, an effective protection of the chamber walls against attack by iron oxides is guaranteed.
What is claimed is:
1. Process for producing coke in more or less regular polygon shape, at least a major portion of which have a diameter of from about 40 to about 60 mm, which comprises (a) mixing together intimately fine grains of coal and hematite iron ore, said grains being below 1 mm, (b) applying the resultant mixture of fine grains of coal and iron ore to the outer surface of coal shapes which have been compacted of fine grains of coal and which contain from about 18 percent to about 38 percent by weight of volatile constituents, (c) thereafter heating the so-obtained shapes with coal-ore mixture coated thereon at coking temperature in an oven for a time sufficient to form substantially regular polygons of coke, and (d) removing and recovering the polygon shaped coke from the coking oven, the ratio of coal to iron ore in the mixture of step (b) being in the range of about 33 to 67 percent (by weight), and the thickness of the outer coating of said mixture on the coal shapes being such as to result in a weight of about 2.5 percent iron ore in the resultant polygonal coke.
2. Polygonal coke of more or less regular shape prepared according to the process of claim 1.
i i i
Claims (1)
- 2. Polygonal coke of more or less regular shape prepared according to the process of claim 1.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2017816A DE2017816C3 (en) | 1970-04-14 | 1970-04-14 | Process for the production of equal piece coke in coking chambers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3725038A true US3725038A (en) | 1973-04-03 |
Family
ID=5768054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00107231A Expired - Lifetime US3725038A (en) | 1970-04-14 | 1971-01-18 | Process for making polygon coke in coking chambers and coke so produced |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3725038A (en) |
| JP (1) | JPS4921082B1 (en) |
| BE (1) | BE759577A (en) |
| DE (1) | DE2017816C3 (en) |
| FR (1) | FR2092272A5 (en) |
| NL (1) | NL7012646A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3841849A (en) * | 1970-09-25 | 1974-10-15 | F Beckmann | Process of manufacturing fuel briquettes |
| DE2444066A1 (en) * | 1974-09-14 | 1976-03-25 | Gudenau Heinrich Wilhelm | Coke from poorly coking coal - by agglomeration of fine coal with binder before normal coking |
| US4105501A (en) * | 1975-10-23 | 1978-08-08 | Nippon Kokan Kabushiki Kaisha | Method for producing metallurgical coke |
| US4886521A (en) * | 1988-05-05 | 1989-12-12 | U.S. Department Of Energy | Decaking of coal or oil shale during pyrolysis in the presence of iron oxides |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6029271U (en) * | 1983-08-03 | 1985-02-27 | 日本電気株式会社 | oil detection sensor |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2052329A (en) * | 1931-09-12 | 1936-08-25 | American Lurgi Corp | Process of and apparatus for granulating fine material by adhesion to moistened nuclear fragments |
| US2127632A (en) * | 1935-05-08 | 1938-08-23 | St Joseph Lead Co | Concretionary agglomerate |
| US2411873A (en) * | 1944-06-15 | 1946-12-03 | Erie Mining Co | Process of molding balls |
| US2805141A (en) * | 1954-05-24 | 1957-09-03 | Univ Minnesota | Pelletizing process |
| US3163519A (en) * | 1961-10-05 | 1964-12-29 | Allis Chalmers Mfg Co | Pellet of iron ore and flux, apparatus and method for making same |
| US3188195A (en) * | 1961-10-05 | 1965-06-08 | Allis Chaimers Mfg Company | Pellet of iron ore and flux, and method for making same |
| US3219436A (en) * | 1962-06-30 | 1965-11-23 | Metallgesellschaft Ag | Method for reducing iron oxides into sponge iron |
| US3377146A (en) * | 1967-01-26 | 1968-04-09 | Ireland James D | Process for pelleting and extruding materials |
-
0
- BE BE759577D patent/BE759577A/en unknown
-
1970
- 1970-04-14 DE DE2017816A patent/DE2017816C3/en not_active Expired
- 1970-08-26 NL NL7012646A patent/NL7012646A/xx unknown
- 1970-10-02 JP JP45086563A patent/JPS4921082B1/ja active Pending
- 1970-11-23 FR FR7041951A patent/FR2092272A5/fr not_active Expired
-
1971
- 1971-01-18 US US00107231A patent/US3725038A/en not_active Expired - Lifetime
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2052329A (en) * | 1931-09-12 | 1936-08-25 | American Lurgi Corp | Process of and apparatus for granulating fine material by adhesion to moistened nuclear fragments |
| US2127632A (en) * | 1935-05-08 | 1938-08-23 | St Joseph Lead Co | Concretionary agglomerate |
| US2411873A (en) * | 1944-06-15 | 1946-12-03 | Erie Mining Co | Process of molding balls |
| US2805141A (en) * | 1954-05-24 | 1957-09-03 | Univ Minnesota | Pelletizing process |
| US3163519A (en) * | 1961-10-05 | 1964-12-29 | Allis Chalmers Mfg Co | Pellet of iron ore and flux, apparatus and method for making same |
| US3188195A (en) * | 1961-10-05 | 1965-06-08 | Allis Chaimers Mfg Company | Pellet of iron ore and flux, and method for making same |
| US3219436A (en) * | 1962-06-30 | 1965-11-23 | Metallgesellschaft Ag | Method for reducing iron oxides into sponge iron |
| US3377146A (en) * | 1967-01-26 | 1968-04-09 | Ireland James D | Process for pelleting and extruding materials |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3841849A (en) * | 1970-09-25 | 1974-10-15 | F Beckmann | Process of manufacturing fuel briquettes |
| DE2444066A1 (en) * | 1974-09-14 | 1976-03-25 | Gudenau Heinrich Wilhelm | Coke from poorly coking coal - by agglomeration of fine coal with binder before normal coking |
| US4105501A (en) * | 1975-10-23 | 1978-08-08 | Nippon Kokan Kabushiki Kaisha | Method for producing metallurgical coke |
| US4886521A (en) * | 1988-05-05 | 1989-12-12 | U.S. Department Of Energy | Decaking of coal or oil shale during pyrolysis in the presence of iron oxides |
Also Published As
| Publication number | Publication date |
|---|---|
| BE759577A (en) | 1971-04-30 |
| NL7012646A (en) | 1971-10-18 |
| FR2092272A5 (en) | 1971-01-21 |
| DE2017816C3 (en) | 1979-12-20 |
| DE2017816A1 (en) | 1971-10-28 |
| DE2017816B2 (en) | 1979-04-26 |
| JPS4921082B1 (en) | 1974-05-29 |
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