EP0120509A1 - Verfahren zur Direktreduktion von gesintertem eisenoxidhaltigem Material zu Eisenschwamm in einem Drehrohrofen - Google Patents
Verfahren zur Direktreduktion von gesintertem eisenoxidhaltigem Material zu Eisenschwamm in einem Drehrohrofen Download PDFInfo
- Publication number
- EP0120509A1 EP0120509A1 EP84200183A EP84200183A EP0120509A1 EP 0120509 A1 EP0120509 A1 EP 0120509A1 EP 84200183 A EP84200183 A EP 84200183A EP 84200183 A EP84200183 A EP 84200183A EP 0120509 A1 EP0120509 A1 EP 0120509A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotary kiln
- sinter
- charged
- sintering
- sintered
- 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.)
- Withdrawn
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 17
- 239000000463 material Substances 0.000 title claims description 14
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 title claims description 12
- 238000000034 method Methods 0.000 title claims description 9
- 229910052742 iron Inorganic materials 0.000 title claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 11
- 239000001257 hydrogen Substances 0.000 claims abstract description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000005245 sintering Methods 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 5
- 239000004449 solid propellant Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 238000001465 metallisation Methods 0.000 abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000377 silicon dioxide Substances 0.000 abstract description 2
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 239000000571 coke Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 239000003077 lignite Substances 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 239000003476 subbituminous coal Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- -1 anthracite Chemical class 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052595 hematite Inorganic materials 0.000 description 1
- 239000011019 hematite Substances 0.000 description 1
- 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 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003278 mimic effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
Definitions
- the invention relates to a process for the direct reduction of sintered containing iron oxide material to sponge iron in a rotary kiln, wherein a sintered mixture of fine-grained containing iron oxide material and solid fuel is sintered on a sintering machine while passing sour b toff ambiencen gases and the sinter after a crushing fixed kohleiistoff ambiencem reducing agent in the rotary kiln is charged.
- Sponge iron is generally produced in a rotary kiln using chippings or pellets, since the use of fine-grained ores leads to difficulties or requires special measures.
- fine-grained sponge iron generally has to be agglomerated on pig iron or steel before further processing.
- the material For pelleting, the material must be in pellet fineness, i.e. very fine-grained.
- the object of the invention is to minimize the amount of undersize in the direct reduction of sinter in the rotary kiln and to achieve good metallization with as little effort as possible.
- the fine-grained oxidic material mainly consists of fine-grained iron ores and the oxidic material produced in the direct reduction plant. Metallized or pre-reduced fine-grained material that is produced in the direct reduction system can also be used.
- the oxidic material is mixed with the additives required to adjust the ratio of CaO to SiO 2 , such as limestone and silica, the solid fuel required for sintering, usually fine-grained coke, the return material from the sintering machine and with adjustment of the required moisture.
- the sinter mixture produced in this way is fed onto the sintering machine.
- the conditions for producing the sintered mixture taking into account the ratio of CaO to Si0 2 of the present invention, and the condition for sintering in the sintering machine correspond to the known B EDIN conditions for the production of sintered for the use in the blast furnace. In the adjustment of the ratio of C to SiO aO other basic or acidic G remain angart worrymaschinen.
- the sintered mixture is metallized or Pre-reduced fine material is added, its heat of oxidation is taken into account when measuring the addition of coke.
- the addition of metallized or pre-reduced fines is not necessary.
- the solid carbon-containing reducing agent charged in the rotary kiln should not release any elemental hydrogen at all up to a temperature of 600-700 ° C. In any case, the value must be below 1% by weight, based on the reducing agent used.
- the amount of elemental hydrogen released generally increases with the volatiles content of the coals. Coals that release little hydrogen, such as anthracite, or sulphurized coals, such as coke.
- Coals that release a higher content of elemental hydrogen must therefore be used at a point on the rotary kiln where the feed *, already Has a higher temperature and is not cooled below this temperature by the subsequent addition of the reducing agent.
- Such a subsequent addition of part of the solid reducing agent can take place, for example, by blowing coal into the discharge end of the rotary kiln and distributing it over the reduction zone if the rotary kiln is operated in countercurrent between the feed and the gas atmosphere.
- a preferred embodiment is that the sinter is charged with a ratio of CaO to Si0 2 of 1.1-1.3 in the rotary kiln. This gives particularly good results.
- a preferred embodiment consists in charging the sinter with a slag content of at least 10% by weight in the rotary kiln.
- the slag content is chosen so that the amount is as close as possible to 10%, but is also sufficient for good results.
- the optimal value is determined empirically for each material.
- a preferred embodiment consists in charging the sinter in a piece size of 5-50 mm into the rotary kiln. With this piece size, good degrees of metallization are achieved.
- a preferred embodiment consists in charging the sinter in a piece size of 5-30 mm into the rotary kiln. This piece size results in further improved degrees of metallization.
- a preferred embodiment is that the exhaust gas from the rotary kiln is used for indirect heating of air, and the hot air is passed through the sintering mixture after the ignition of the sintering mixture on the sintering machine.
- the hot air can be passed through as sintered air only over part of the sintered section of the sintering machine or over the entire length of the sintered section.
- fuel savings mainly occur, while in the second case the temperature of the sinter that is thrown off is increased, so that the sinter can be charged into the rotary kiln at a high temperature and the rotary kiln is relieved of the corresponding heating work.
- the sintering tests were carried out on a square sintering pan with an area of 0.16 m 2 .
- the sinter mixture was ignited after each mixing of the individual components, moistening and filling into the sintering pan with hot air at 1200 ° C.
- the firing front was then pulled through the sintering mixture under reduced pressure and the sintering cake was then cooled on the sintering pan.
- the sinter was then dropped 5 times from a height of 2 m to mimic the stress in an industrial plant.
- the fraction - 6 mm was used as return material (50%), the fraction 15 - 25 mm as rust (3 cm).
- the R eduzier muscles first drops with increasing alkalinity and then rises sharply from 0.42.
- the decrease in the amount of slag expressed here as CaO + Si0 2 content, has a negative influence on both the low-temperature decay and the mechanical strength.
- the tests were carried out in a short drum furnace with a sintering insert of 70 kg.
- the reducing agents were added in an amount for a Cfix / Fe ratio of 0.6.
- the reduction time after heating to the reaction temperature prescribed by the reactivity of the coal was 3 hours.
- the sintering insert had a grain size of 5 - 30 mm.
- Lignite and sub-bituminous coal or their coke were used in each case.
- Subbituminous coal requires higher reaction temperatures than lignite because of its lower reactivity.
- the sintering properties already mentioned are particularly important for direct solids reduction of sinter in the rotary tube.
- Mechanical strength and low-temperature disintegration stability determine disintegration and fine fraction development in the rotary tube, the reducibility affects in particular the furnace performance.
- Fine particles in particular - 3 mm disrupt the process.
- the advantages of the invention are that a direct reduction from sinter containing iron oxide to sponge iron in a rotary kiln is possible with good levels of metallization and low disintegration.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3306614 | 1983-02-25 | ||
| DE19833306614 DE3306614A1 (de) | 1983-02-25 | 1983-02-25 | Verfahren zur direktreduktion von gesintertem eisenoxidhaltigem material zu eisenschwamm in einem drehrohrofen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0120509A1 true EP0120509A1 (de) | 1984-10-03 |
Family
ID=6191798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP84200183A Withdrawn EP0120509A1 (de) | 1983-02-25 | 1984-02-09 | Verfahren zur Direktreduktion von gesintertem eisenoxidhaltigem Material zu Eisenschwamm in einem Drehrohrofen |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0120509A1 (enrdf_load_stackoverflow) |
| DE (1) | DE3306614A1 (enrdf_load_stackoverflow) |
| IN (1) | IN158582B (enrdf_load_stackoverflow) |
| TR (1) | TR21789A (enrdf_load_stackoverflow) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1177178B (de) * | 1963-07-10 | 1964-09-03 | Thyssen Huette Ag | Verfahren zur Herstellung von Eisenerz-Sinter |
| DE1265764B (de) * | 1961-12-08 | 1968-04-11 | Metallgesellschaft Ag | Verfahren und Vorrichtung zur direkten Reduktion von auf einem Sinterband hartgebrannten Eisenerzpellets im Drehrohrofen |
| DE1266321B (de) * | 1956-07-30 | 1968-04-18 | R N Corp | Verfahren zur Reduktion von Eisenerz |
| DE1758951B2 (de) * | 1968-09-07 | 1977-09-08 | Fried Krupp GmbH, 4300 Essen | Verfahren zur herstellung von eisenschwamm |
-
1983
- 1983-02-25 DE DE19833306614 patent/DE3306614A1/de active Granted
-
1984
- 1984-02-09 EP EP84200183A patent/EP0120509A1/de not_active Withdrawn
- 1984-02-09 IN IN96/CAL/84A patent/IN158582B/en unknown
- 1984-02-24 TR TR2178984A patent/TR21789A/xx unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1266321B (de) * | 1956-07-30 | 1968-04-18 | R N Corp | Verfahren zur Reduktion von Eisenerz |
| DE1265764B (de) * | 1961-12-08 | 1968-04-11 | Metallgesellschaft Ag | Verfahren und Vorrichtung zur direkten Reduktion von auf einem Sinterband hartgebrannten Eisenerzpellets im Drehrohrofen |
| DE1177178B (de) * | 1963-07-10 | 1964-09-03 | Thyssen Huette Ag | Verfahren zur Herstellung von Eisenerz-Sinter |
| DE1758951B2 (de) * | 1968-09-07 | 1977-09-08 | Fried Krupp GmbH, 4300 Essen | Verfahren zur herstellung von eisenschwamm |
Non-Patent Citations (1)
| Title |
|---|
| STAHL UND EISEN, Band 88, Nr. 20, 3. Oktober 1968, Düsseldorf K. GREBE "Kornzerfall von Sinter während der Reduktion", Seiten 1098-1104 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3306614C2 (enrdf_load_stackoverflow) | 1991-08-01 |
| IN158582B (enrdf_load_stackoverflow) | 1986-12-13 |
| TR21789A (tr) | 1985-07-15 |
| DE3306614A1 (de) | 1984-08-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Designated state(s): DE FR GB IT |
|
| 17P | Request for examination filed |
Effective date: 19841031 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
| 18W | Application withdrawn |
Withdrawal date: 19851220 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: ROMBERG, MICHAEL Inventor name: CAPPEL, FRED, DR. |