CN1264994C - Process for preparing slag by pelletization of steel-making dust slime - Google Patents
Process for preparing slag by pelletization of steel-making dust slime Download PDFInfo
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- CN1264994C CN1264994C CNB2005100653441A CN200510065344A CN1264994C CN 1264994 C CN1264994 C CN 1264994C CN B2005100653441 A CNB2005100653441 A CN B2005100653441A CN 200510065344 A CN200510065344 A CN 200510065344A CN 1264994 C CN1264994 C CN 1264994C
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- China
- Prior art keywords
- steel
- delivered
- ball
- making dust
- dust slime
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- Expired - Fee Related
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- 238000009628 steelmaking Methods 0.000 title claims abstract description 35
- 239000000428 dust Substances 0.000 title claims abstract description 24
- 238000005453 pelletization Methods 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 239000002893 slag Substances 0.000 title claims description 13
- 239000008188 pellet Substances 0.000 claims abstract description 33
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000000292 calcium oxide Substances 0.000 claims abstract description 11
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 238000005096 rolling process Methods 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 10
- 239000011230 binding agent Substances 0.000 claims description 9
- 238000012216 screening Methods 0.000 claims description 9
- 229930000044 secondary metabolite Natural products 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 15
- 239000003795 chemical substances by application Substances 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 10
- 239000007767 bonding agent Substances 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- 238000007605 air drying Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003325 tomography Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-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
- 239000004571 lime Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000036314 physical performance Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention relates to a comprehensive utilization technique for steel-making dust slime, more specifically to a technology for making pelletizing agents of steel-making dust slime for steel making. The present invention has the technological process that the steel-making dust slime is naturally dried in air; a mixture prepared from 2% to 6% of quick lime and 0.5% to 1% of bonding agent is added to the steel-making dust slime as a raw material; the mixture is delivered to a stirrer to be uniformly stirred, is delivered to a wheel roller to be sufficiently rolled and then is delivered to a pelletizer to be made into raw pellets in a pellet rolling mode, the pelletizing pressure is from 40 to 60KN, and the sizes of the pellets are from phi 20mm to phi 30mm; the raw pellets are sieved by a vibration sieve, the raw pellets on the sieve are finished raw pellets, and scraps below the sieve are used as returning materials to be delivered to the stirrer; the raw pellets are delivered to a shaft furnace through a feeding system to be baked and solidified, the baked and solidified pellets are finished pellets which can be used as the pelletizing agents applied to steel-making production.
Description
Technical field
The present invention relates to a kind of steel making dust slime comprehensive utilization technique, specifically a kind of manufacturing process of using Steelsmelting dust-mud pelletizing slag-melting agent of making steel.
Background technology
The comprehensive utilization technique of present steel making dust slime, mainly be that steel making dust slime is processed into slag decomposing agent for smelting steel, return STEELMAKING PRODUCTION and use, show through process for making research and production application, steel making dust slime has cooling, changes effects such as slag, dephosphorization, desulfurization as slag decomposing agent for smelting steel.In the existing technology that steel making dust slime is processed into slag decomposing agent for smelting steel, mainly contain annular kiln sintering process and coal-pressing ball method.In general, the annular kiln sintering process need be equipped with the high temperature service and the extrusion equipment of even heating, and its shortcoming is that investment is big, the energy consumption height, and the product needed behind the sintering just can be gone into the steel-making use after being broken into certain particle; The coal-pressing ball method is after being dried to steel making dust slime to a certain degree, behind various binding agents, carry out pressure ball, and then carry out nature and stack maintenance, make it to obtain certain intensity, the shortcoming of this technology be need be very big place and long maintenance, the binding agent cost that uses is higher, and the pellet strength that is obtained, particularly hot strength are difficult to guarantee.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of steel making dust slime pelletizing manufacturing process as slag decomposing agent for smelting steel is provided, this technology has stable, finished pellet intensity height, the characteristics that Pulverization ratio is low.
The object of the present invention is achieved like this:
Technological process of the present invention is: with the steel making dust slime natural air drying; In the steel making dust slime raw material, add the unslaked lime of dirt mud weight 2～6%, the binding agent of dirt mud weight 0.5～1%, be mixed with the mixed once material; Mixed once material and the mixing of returns secondary are delivered to stirrer through conveyor, stir; The secondary compound is delivered to crushing mill through conveyor, fully pulverize, material particles reaches 0.05～0.15mm, and the secondary mixture moisture is 8～12% behind the rolling; The secondary compound is delivered to pelletizer through conveyor, and so that roll-in group mode is made green-ball, the group's of pressure pressure is 40～60KN, and pelletizing is of a size of Φ 20～Φ 30mm; Green-ball is crossed vibratory screening apparatus, and green-ball is the finished product green-ball on the sieve, and sieve particle is down delivered to stirrer as returns; It is fixed that the finished product green-ball is delivered to shaft roasting through feeding system, and be 20～30 minutes warm up time, and preheating temperature is 550～700 ℃, roasting time is 25～35 minutes, maturing temperature is 900～1000 ℃, and the pelletizing behind the baking and concretion is a finished pellet, can be used as dissolving agent and is applied to STEELMAKING PRODUCTION.
Technology of the present invention is utilized unslaked lime and water to react and is generated Ca (OH) as binding agent with wilkinite in the unslaked lime replacement prior art during batching
2The viscosifying power of colloidal solid bears the intensity of heating rapidly with intensity and the green-ball that improves green-ball, helps generating calcium ferrite simultaneously, promotes the quick slagging of steel-making.Adopt when making ball roll-in group mode is improved green pellet strength, the group's of pressure pressure-controlling can improve the connecting forces of inlaying that forms in the viscous deformation degree of material particles and the pelletizing about 50KN, further improve green ball strength; Material moisture is controlled at about 10% when making ball, helps the green pellets demoulding, reduces the cracking and the tomography of green pellets, can reduce the explosion phenomenon of green pellets in consolidation process simultaneously, compared with prior art greatly reduces the breakage rate of green-ball; The pelletizing size control can improve the ultimate compression strength of finished pellet at Φ 20～Φ 30mm, can also improve its melting properties in steel-making is used simultaneously, strengthens result of use.
Adopt unslaked lime as binding agent when technology of the present invention is prepared burden, improve green ball strength; Adopt when making ball roll-in group mode, the rational group's of pressure pressure and moisture controlled, when improving green ball strength, reduced the breakage rate of green-ball; Adopt rational maturing temperature and time during roasting, guaranteed finished pellet intensity, reduced the secondary Pulverization ratio in finished pellet storage, transportation and the use thereof; The product of explained hereafter of the present invention, ultimate compression strength is greater than 1500N/, and the dropping strength index is greater than 90%, and volume density is greater than 3.0g/cm
3Technology of the present invention compared with prior art, and is stable, operation is convenient, finished pellet intensity height, advantage such as Pulverization ratio is low.
Production application in converter shows as dissolving agent in the dirt mud ball group of explained hereafter of the present invention, and this dirt mud ball group dissolving agent has obvious effect in the dephosphorization ability that improves converter initial stage slag hardness, quickening initial stage slag formation time, raising converter slag; Converter steelmaking process can provide some amount oxygen, reclaim a certain amount of ferro element, improve metal recovery rate, play cooling effect simultaneously, can substitute the part ore, reduce lime consumption, reduce the oxygen depletion amount.
The product leading indicator of explained hereafter of the present invention is as follows:
1, Chemical Composition index
The chemical ingredients of dirt mud ball group
| Composition | TFe | FeO | Fe 2O 3 | CaO | SiO 2 | Al 2O 3 | S | P |
| ％ | 57.44 | 12.18 | 66.15 | 12.30 | 2.58 | 2.17 | 0.053 | 0.038 |
2, physical performance index
The physicals of dirt mud ball group
| Bulk density g/cm 3 | Melting temperature ℃ | Finished product agglomerate ultimate compression strength N/ | Finished product agglomerate dropping strength index % | Water content % |
| 1.84 | 1260-1280 | 1640 | 93.1 | 0.5 |
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Below in conjunction with process flow sheet technology of the present invention is described further:
Technology of the present invention comprises batching, stirring, rolling, makes ball, operation such as fixed,
(1) batching: in the steel making dust slime raw material of natural air drying, add the unslaked lime of dirt mud weight 2～6% and the binding agent of dirt mud weight 0.5～1%, mixed once, be mixed with the mixed once material, the adding of unslaked lime and additive can improve the intensity of yield rate and finished pellet, makes product be suitable for using in steel-making;
(2) stir: mix with the mixed once material with through the undersized returns secondary of vibratory screening apparatus, dirt mud raw material, unslaked lime, the binding agent of secondary compound are stirred, to guarantee finished pellet intensity, stable components, avoid the finished pellet quality fluctuation, influence product and in steel-making, use;
(3) rolling: the secondary compound is delivered to crushing mill through conveyor, fully pulverize, make mixture particle reach 0.05～0.15mm, can prevent pelletizing explosion in roasting process, mixture moisture is 8～12% behind the rolling, helps the green pellets demoulding, reduces the cracking and the tomography of green pellets;
(4) group of pressure: the secondary compound is delivered to pelletizer through conveyor, employing is made green-ball to roll-in group mode, the group's of pressure pressure is 40～60KN, pelletizing is of a size of Φ 20～Φ 30mm, can improve the intensity of green-ball and finished pellet, pelletizing is shaped as oblateness, and conveyor is carried when being beneficial to the steel-making application;
(5) screening: green-ball is crossed vibratory screening apparatus, and green-ball is the finished product green-ball on the sieve, and sieve is delivered to stirrer less than the particle of 5mm as returns down;
(6) fixed: it is fixed that the finished product green-ball is delivered to shaft roasting through feeding system, the fixed processes such as preheating, heating, roasting that comprise, improve along with temperature in the consolidation process, pelletizing moisture reduces, capillary force increases, simultaneously, generate the rhombohedral iron ore crystallite on the magnetite surface, and make each material combination, improve pellet strength, be 20～30 minutes warm up time, preheating temperature is 550～700 ℃, and roasting time is 25～35 minutes, and maturing temperature is 900～1000 ℃, pelletizing behind the baking and concretion is a finished pellet, can be used as dissolving agent and is applied to process for making.
Embodiment:
A collection of steel making dust slime raw material behind natural air drying, unslaked lime with addition of 5% and 0.7% binding agent are made the mixed once material; The mixed once material is mixed with the returns secondary, get 4 tons of secondary compounds and deliver to screw mixer stirring 5 minutes through conveyor, deliver to wheel roller through conveyor again and carry out rolling, rolling 10 minutes is made ball after conveyor is delivered to roll-in group formula pelletizer; Mixture moisture is controlled at 10% when making ball, and pressure-controlling is at 50KN; The green pellets of making is through vibratory screening apparatus, and green pellets is packed on the sieve, and to send into shaft furnace through feeding system fixed for hopper, and sieve particle down returns stirrer as returns and utilizes; After green pellets added shaft furnace, preheating was 25 minutes under 600 ℃ of temperature, 950 ℃ of roasting temperatures 30 minutes, was the steel making dust slime finished pellet after the cooling of coming out of the stove then.
Claims (3)
1, a kind of process for preparing slag by pelletization of steel-making dust slime comprises following operation, it is characterized in that,
(1) batching: with the steel making dust slime raw material, the unslaked lime of steel making dust slime weight 2～6%, the binding agent mixed once of steel making dust slime weight 0.5～1% is mixed with the mixed once material;
(2) stir:, stir delivering to stirrer after mixed once material and the mixing of returns secondary;
(3) rolling: the secondary compound is delivered to wheel roller, fully pulverize, material particles reaches 0.05～0.15mm, and mixture moisture is 8～12% behind the rolling;
(4) group of pressure: the secondary compound is delivered to pelletizer, and so that roll-in group mode is made green-ball, the group's of pressure pressure is 40～60KN, and pelletizing is of a size of φ 20～φ 30mm;
(5) screening: green-ball is crossed vibratory screening apparatus, and green-ball is the finished product green-ball on the sieve, and sieve particle is down delivered to stirrer as returns;
(6) fixed: it is fixed that the finished product green-ball is delivered to shaft roasting, and be 20～30 minutes warm up time, and preheating temperature is 550～700 ℃, and roasting time is 25～35 minutes, and maturing temperature is 900～1000 ℃, and the pelletizing behind the baking and concretion is a finished pellet.
2, process for preparing slag by pelletization of steel-making dust slime according to claim 1, described pressure is rolled into a ball in the operation, and pelletizing is shaped as oblateness.
3, process for preparing slag by pelletization of steel-making dust slime according to claim 1, in the described screening operation, the vibratory screening apparatus sieve is delivered to stirrer less than the particle of 5mm as returns down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100653441A CN1264994C (en) | 2005-04-04 | 2005-04-04 | Process for preparing slag by pelletization of steel-making dust slime |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100653441A CN1264994C (en) | 2005-04-04 | 2005-04-04 | Process for preparing slag by pelletization of steel-making dust slime |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1664120A CN1664120A (en) | 2005-09-07 |
| CN1264994C true CN1264994C (en) | 2006-07-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100653441A Expired - Fee Related CN1264994C (en) | 2005-04-04 | 2005-04-04 | Process for preparing slag by pelletization of steel-making dust slime |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1264994C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103667691B (en) * | 2013-12-12 | 2015-03-25 | 攀枝花钢城集团有限公司 | High-iron-content pellet for converter steelmaking and preparation method of high-iron-content pellet |
| CN103952540B (en) * | 2014-03-24 | 2016-04-13 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Ion dust mud contaning and high silicon iron concentrate is utilized to produce the technique of prereduced burden |
| CN106191435A (en) * | 2016-08-09 | 2016-12-07 | 重庆大学 | A kind of municipal sludge resource utilization method in pellet sintering |
| CN106244798A (en) * | 2016-08-22 | 2016-12-21 | 山东钢铁股份有限公司 | A kind of method utilizing sintering process Treatment of Wastewater in Coking |
| CN112062545A (en) * | 2020-07-30 | 2020-12-11 | 玉溪新兴钢铁有限公司 | Iron-dust-containing mud ball and preparation method and application thereof |
| CN114875236A (en) * | 2022-05-17 | 2022-08-09 | 新源县渣宝环保技术有限公司 | Method for producing high-strength pellets by using steel slag fine powder |
-
2005
- 2005-04-04 CN CNB2005100653441A patent/CN1264994C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1664120A (en) | 2005-09-07 |
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Granted publication date: 20060719 Termination date: 20110404 |