CN1038259C - Method for preventing sponge iron from binding in production - Google Patents
Method for preventing sponge iron from binding in production Download PDFInfo
- Publication number
- CN1038259C CN1038259C CN94108166A CN94108166A CN1038259C CN 1038259 C CN1038259 C CN 1038259C CN 94108166 A CN94108166 A CN 94108166A CN 94108166 A CN94108166 A CN 94108166A CN 1038259 C CN1038259 C CN 1038259C
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- CN
- China
- Prior art keywords
- powder
- sponge iron
- ore
- sticking
- iron
- 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 - Fee Related
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 42
- 230000008569 process Effects 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003245 coal Substances 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 6
- 239000004571 lime Substances 0.000 claims abstract description 6
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- 229910000514 dolomite Inorganic materials 0.000 claims abstract 3
- 239000010459 dolomite Substances 0.000 claims abstract 3
- 239000000853 adhesive Substances 0.000 claims abstract 2
- 230000001070 adhesive effect Effects 0.000 claims abstract 2
- 230000004523 agglutinating effect Effects 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 229910002114 biscuit porcelain Inorganic materials 0.000 claims description 2
- 239000000428 dust Substances 0.000 claims 2
- 238000006722 reduction reaction Methods 0.000 abstract description 8
- 239000002184 metal Substances 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 abstract description 2
- 239000011812 mixed powder Substances 0.000 abstract 2
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 230000024121 nodulation Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000002817 coal dust Substances 0.000 description 6
- 239000008188 pellet Substances 0.000 description 6
- 238000005245 sintering Methods 0.000 description 5
- 235000012255 calcium oxide Nutrition 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001465 metallisation Methods 0.000 description 3
- 238000005453 pelletization Methods 0.000 description 3
- 238000011946 reduction process Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000009687 sponge iron process Methods 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention relates to a method for preventing sponge iron from binding in production. The present invention is characterized in that in the stage for preparing raw materials, the manufactured ore balls or ore blocks are bound with powder through the powder binding technology. The method comprises the steps: coal (or carbon) powder is proportionally mixed with lime (or dolomite) powder to prepare mixed powder; water is used as an adhesive; the mixed powder is firmly pasted on the surfaces of ore bodies through rolling operation or extrusion. The ore bodies bound with powder can effectively prevent iron protoxide and active metal iron from diffusing and binding in the process of the reduction reaction, and thereby, the purpose of preventing the binding between the ore bodies and nodulation of a furnace wall in the process of directly reducing and producing sponge iron is achieved. Simultaneously, the method is favorable to enhancing the yield and the quality of the sponge iron, and has the advantages of simple implementation and low cost.
Description
The present invention belongs to directly also original production sponge iron technical field, relates to a kind of novel method that prevents bonding, dross in the sponge iron production process.
With direct also original production sponge iron is a sophisticated technology, but has the problem of bonding and ore body and furnace wall dross between ore body in process of production, has directly influenced normally carrying out and the raising of productivity of production, also influences the sponge iron career development.At present, taked many measures at this problem both at home and abroad, as: the proportioning in carbon and ore deposit 1, enlarged, to reduce between ore deposit and the ore deposit or to react the chance that the furnace wall directly contacts.2, improve the body of heater geometric angle.3, improve the smooth finish on inboard wall of furnace body surface.4, utilize active high coal (carbon), adopt the lowest temperature red-tape operati.5, isolate contacting of ore body and furnace wall with coke powder or coal dust.6, before the shove charge ore body powder is removed or the like.These retouch execute still can not stop in practice ore body ferric oxide be converted into iron protoxide in the metallic iron process, reactive metal iron to its ore body between the diffusion or the bonding of surface and furnace wall.
The objective of the invention is: at the shortcoming and defect of prior art, providing a kind of passes through at ore body surface adhesion duff (or carbon), lime (or rhombspar), make sticking fine ore body (ball or piece) as the raw material of producing sponge iron, can effectively prevent the diffusion and the bonding of iron protoxide and reactive metal iron in smelting sponge iron reduction reaction process.The method of the bonding between the solution ore body and the dross of furnace wall.
The object of the present invention is achieved like this: in the raw material preparatory stage of directly going back the original production sponge iron, at first powder is caused ore deposit ball (or nugget), diameter (or particle diameter) is 10-15mm, carries out the sticking powder of ore body again.Its technological process is that employing coal (or carbon) powder, lime (or rhombspar) powder are powder (it is following that its granularity is 0.147mm), and the volume ratio of two kinds of powder is 3-6: 1 mixing fills and gets final product.Water bonds powder mix as wedding agent (moisture content should be 8-12%) on the ore body surface, and makes the roll extrusion of mixing bisque extremely by till the water saturates by pelletizer or extrusion machine.Powder layer thickness is to decide according to ore body character, if general 0.2-1.2mm than the sphere of powder (or piece), can directly drop in the stove and produce, Yi Bian also can go into to depositing, dries in the shade naturally, if the sphere of powder is carried out high temperature, high humidity processing, better effects if.
In the process of making the sphere of powder, CaO and hydrate thereof not only are bonded at the ore body surface to coal (or carbon) powder, its plastic mass is permeated the ore body surface simultaneously, breeze forms shell under its effect, coal dust and breeze are bonded as one, make it have certain intensity, sticking fine ore body is in process of production from the hygrometric state to the dry state, can keep definite shape and the load request that satisfies under the different technology conditions from the normal temperature district to the high-temperature zone, little to the reduction reaction influence.
In reduction process, after coal dust is oxidized, being the very weak powdery layer of intensity exists, its remains are bonded in the ore body surface as coal ash, has prevention and disruptive oxidation ferrous, reactive metal iron diffusion and agglutinating ability, other has its powdery layer can become sealing coat, and the crystalline phase in later stage of preventing to reduce bonds.Therefore, adopt sticking coal dust ore body to produce sponge iron, can prevent bonding and furnace wall dross between ore body effectively.
In addition, adopt this method, can suitably improve temperature of reaction, the accelerated reaction process helps boosting productivity, and simultaneously because of the outer field CaO of ore body has the effect of the sulfide of absorption, can reduce that sulphur content is favourable improves the quality of products.
The present invention produces sponge iron with not sticking fine ore body and relatively has following advantage:
1, adopting sticking fine ore body is raw material, can prevent effectively that in producing the sponge iron process ore body bonding and furnace wall dross accident from taking place, and guarantees to produce to carry out smoothly.
2, technology of the present invention is simple, easy to operate, only in the raw material preparatory stage ore body is made the sticking powder craft of satisfactory ball or piece and increase and gets final product, and reduces investment outlay.
3, adopt this method to produce sponge iron, can directly adopt cold ball of breeze or piece (not sintering),, opened up the new road that sponge iron is produced than generally low with agglomerates of sintered pellets material cost.
4, present method is mixed other material few (mainly adding entry) so impurity is few in making ball (or piece) process, and the sulfide in the fuel can be absorbed by the CaO on ore body top layer, therefore, can improve the quality of products.
5, present method adopts the ore body (without sintering) that pressure or rolling are shaped, and still keeps certain slit, good permeability between breeze.Other has, and sticking fine ore material also can suitably improve temperature of reaction, all can quicken the reduction reaction process, helps boosting productivity.
Embodiment:
The embodiment of the invention is that two kinds of ore deposit balls of employing are raw material: a kind of is sticking powder sintering pelletizing feed, and a kind of is the ore deposit ball material of sticking powder.In same equipment, produce the sponge iron test with Same Way, in the reduction reaction process, present following two kinds of situations, in order to further specify, under the prerequisite that guarantees output and quality, sticking powder ore pellets can effectively stop ore body bonding and furnace wall dross problem.
(1), raw material is prepared:
Not sticking powder sintering pelletizing feed: adopt high mouthful of agglomerates of sintered pellets material of Taiyuan Iron and Steel Co..Sticking powder ore pellets: adopting high mouthful of breeze diameter of Taiyuan Iron and Steel Co. is φ 10-15mm ore deposit ball.
Material powder: be to adopt fat gas coal or Yangquan coal and the calcareous unslaked lime granularity of one-level to be about 0.175mml.
Tackiness agent is a water.
(1), sticking powder craft: coal dust, lime powder are mixed into powder mix by 4: 1 volume ratios, be tackiness agent (moisture content is 8%) with water, will make the ore deposit ball and put into garden dish pelletizer sticking powder is advanced on ball surface, ore deposit, powder layer thickness is 0.3-1.0mm, till the powder roll extrusion on ball surface, ore deposit is extremely soaked into by moisture content, can directly throw in the stove and use, surplus part can be put and be deposited on one side, dry in the shade naturally (temperature can at 18-32 ℃).
(3), directly go back the bright and beautiful iron tests in original production sea.
This test is to adopt external heating (coal-based), equipment is 30mm for reaction narrow-necked earthen jar wall thickness, internal diameter is the high alumina matter refractory tube of 90mm, reduction temperature: the outer temperature of narrow-necked earthen jar is 1100-1230 ℃, the narrow-necked earthen jar interior reaction temperature is 1050-1150 ℃, reductive agent is that coke powder (also available coal dust) particle diameter is 0.8-4mm, mix charging, the ore deposit ball, the coke powder ratio is 1: 0.6, is divided into left and right sides two halves with sealing coat in the narrow-necked earthen jar, Yi Bian high mouthful of agglomerates of sintered pellets material is housed, sticking powder ore pellets material is housed on one side, in the reduction process, under different metal rate condition, bonding and narrow-necked earthen jar wall dross situation between two kinds of ore deposit ball ore bodies relatively see the following form.
Two kinds of ore deposit balls contrast table in reaction process:
| Degree of metalization (%) | Not sticking powder sintering pelletizing feed | Sticking point ore deposit ball material |
| About 24% | The existing bonding of more ball | No |
| About＜80% | The narrow-necked earthen jar wall is had slight knurl knot | No |
| About＞80% | Indivedual balls are difficult for peeling off because of " iron pin palpus " bonding | Indivedual spheres of powder are also because of " iron pin palpus " bonding, but the crystalline phase bonding is not firm, easily peels off |
| About 〉=90% | Amplify 20 times with magnifying glass and observe the surface, surface irregularities is adhered to seldom | Surface impurity adheres to more, is that the surface forms due to the powdery layer |
Be not difficult to find out that from last table the sticking sphere of powder directly can effectively stop ore body bonding and narrow-necked earthen jar wall adhesion problem in the reduction process.
Two kinds of ore deposit balls influence situation to reduction reaction: under same affair part, and degree of metalization＜70% o'clock, sphere of powder appearance is good not as the sintered balls reductive, but that section is observed sphere of powder internal-response is more even, and better than sintered balls reductive.When degree of metalization＞80%, both are similar.Therefore, little to the reduction reaction influence.
Claims (5)
1, a kind ofly prevents to produce the sponge iron adhesive method, it is characterized in that, in the raw material preparatory stage of directly going back the original production sponge iron, to make ore deposit ball or the nugget with certain size, carry out the sticking powder in surface through sticking powder craft, its process is: with coal or carbon dust and lime or ground dolomite, example mixes as powder according to a certain volume, water carries out roll extrusion or pushes powder mix firmly is bonded at the ore body surface as tackiness agent, and the sticking fine ore body of making is as producing the sponge iron raw material.
2, prevent to produce sponge iron agglutinating method according to claim 1 is described, the diameter or the particle diameter that it is characterized in that making ore deposit ball or nugget are 10-15mm.
3, prevent to produce sponge iron agglutinating method according to claim 1 is described, it is characterized in that, coal or carbon dust and lime or ground dolomite, granularity is below the 0.147mm, and two kinds of powder mixed volumes are than being 3-6: 1.
4, prevent to produce sponge iron agglutinating method according to claim 1 is described, it is characterized in that tackiness agent is a water, moisture content is 8-12%.
5, prevent to produce sponge iron agglutinating method according to claim 1 is described, it is characterized in that sticking bisque decides according to the performance of ore body own, be generally 0.2-1.2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94108166A CN1038259C (en) | 1994-07-20 | 1994-07-20 | Method for preventing sponge iron from binding in production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94108166A CN1038259C (en) | 1994-07-20 | 1994-07-20 | Method for preventing sponge iron from binding in production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1115336A CN1115336A (en) | 1996-01-24 |
| CN1038259C true CN1038259C (en) | 1998-05-06 |
Family
ID=5033368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94108166A Expired - Fee Related CN1038259C (en) | 1994-07-20 | 1994-07-20 | Method for preventing sponge iron from binding in production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1038259C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100424190C (en) * | 2005-08-19 | 2008-10-08 | 张和起 | Sponge iron for charge and its manufacturing method |
| CN101624639B (en) * | 2009-08-05 | 2010-11-10 | 安徽工业大学 | Method for preventing fluidization high-hydrogen reduction bonding defluidization of iron ore powder |
| CN102864264B (en) * | 2011-07-08 | 2014-05-07 | 攀钢集团有限公司 | Anti-adhesion method and device for metallized pellets |
| CN102321799A (en) * | 2011-08-26 | 2012-01-18 | 沈阳博联特熔融还原科技有限公司 | Method for preventing directly reduced metallic pellets from bonding |
| CN106676221A (en) * | 2016-12-06 | 2017-05-17 | 江苏省冶金设计院有限公司 | Jarosite slag treatment method and system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS627806A (en) * | 1985-07-02 | 1987-01-14 | Kobe Steel Ltd | Direct steel making method using vertical furnace |
| CN86104943A (en) * | 1985-07-19 | 1987-07-15 | 株式会社神户制钢所 | The method of reduction smelting iron ore |
-
1994
- 1994-07-20 CN CN94108166A patent/CN1038259C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS627806A (en) * | 1985-07-02 | 1987-01-14 | Kobe Steel Ltd | Direct steel making method using vertical furnace |
| CN86104943A (en) * | 1985-07-19 | 1987-07-15 | 株式会社神户制钢所 | The method of reduction smelting iron ore |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1115336A (en) | 1996-01-24 |
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