CN100348744C - Iron ore pellet and its preparation method - Google Patents
Iron ore pellet and its preparation method Download PDFInfo
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- CN100348744C CN100348744C CNB2006100182999A CN200610018299A CN100348744C CN 100348744 C CN100348744 C CN 100348744C CN B2006100182999 A CNB2006100182999 A CN B2006100182999A CN 200610018299 A CN200610018299 A CN 200610018299A CN 100348744 C CN100348744 C CN 100348744C
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Abstract
The present invention relates to a preparation method for an iron ore pellet, which has the technical scheme that 2 to 4 wt% of forsterite and 0.2 to 0.8 wt% of binder are added to an iron ore, and the forsterite, the binder and the iron ore are uniformly mixed by adding water to obtain a mixture containing 6 to 11 wt% of water; the mixture is preheated at a temperature of 900 to 1000 DEG C for 15 to 25 min after being pelletized and dried, and finally roasted at a temperature of 1260 to 1320 DEG C for 20 to 40 min; the binder is prepared by milling and mixing the components of the following weight percentage: 20 to 40% of sodium carboxymethyl starch, 5 to 10% of polyacrylamide, 0 to 5% of polypropylene, 0 to 5% of sodium humate, 20 to 40% of waterproof putty powder, 3 to 5% of kaoline, 5 to 10% of iron sulfate and 5 to 10% of sodium carbonate. The present invention can enhance the strength and thermal stability of raw pellets, and improve the reduction expansion properties, softening-melting properties, reduction degradation properties and reducibility of pellet ores.
Description
One, technical field
The invention belongs to iron-smelting raw material pellet agglomeration technology.Relate in particular to a kind of iron ore pellets and preparation method thereof.
Two, background technology
The target that blast furnace ironmaking production is pursued is high-quality, low consumption, high yield, and fine fodder is the basic substance of blast furnace high-quality, low consumption, high yield.Reinforcing blast furnace is smelted both at home and abroad, all fine fodder is put in the first place.Since the eighties, from world wide, pellet formation enters the 3rd developmental stage, transfers quality to by output.Pellet formation producer begins to turn to improving pellet quality, reduce cost and improving technology from pursuing pelletizing quantity.Roughly set about from following several respects:
The one-tenth that improves pelletizing is grouped into.Because the blast furnace smelting technology progress rapidly, operating speed is accelerated, and oneself does not satisfy the quick operating requirement of modernized blast furnace simple acidic pellet ore, from improving the viewpoint of metallurgical performance, improve one of pellet formation technology approach, improve the pelletizing composition by adding different additives exactly.Japan at first turns to from acid pellet and produces the alkaline pelletizing that adds Wingdale, and then produces dolomitic pellets." the peridotites pelletizing " of peridotites added in Sweden's research, facts have proved that through blast furnace this magnesium-containing pellets can make conditions of blast furnace be greatly improved.After the blast furnace of countries such as the U.S., Sweden, Japan and Germany uses this pelletizing, compare with common acid pellet, coke ratio has reduced by 40～50 kilograms of (J.W.Currier (U.S.), peridotites effects in blast furnace is produced, agglomerates of sintered pellets, 1989 the 5th phases: 50-56.).Common pelletizing additive mainly contains Wingdale, rhombspar, magnesite etc. at present.(Xu Manxing, the quality progress of opinion new millennium pellet, pelletizing technology, 1990 the 1st phases: 1-3) add Wingdale, rhombspar, magnesite, owing to be MeCO all
3Form is added, and thermolysis all can consume a large amount of heats in stove, and simultaneously, the flux thermolysis discharges a large amount of CO
2, cause that coal gas chemical energy utilization ratio reduces, and can cause the rising of pelletizing energy consumption like this.
Adopt new binding agent.At present, the binding agent that may or be used for the powdered iron ore moulding has wilkinite, lime, cement, water glass, borate, clay, coal tar, petroleum slag, flyash, spent pulping liquor, syrup, marine plant (sodium alginate), humic acids, various starch, water glass, Peridur and polyacrylamide etc., a multitude of names.Generally binding agent is divided into inorganic and organic binder bond etc. by its source.Characteristics such as in general, mineral binder bond has Heat stability is good, and the dry bulb group intensity that makes is better, but all can exist green ball strength relatively poor inevitably, brought impurity into, reduced concentrate grade etc.Though and existing organic binder bond green ball strength height, ubiquity problem (Huang Tianzheng, the present Research of pelletizing additive and development, agglomerates of sintered pellets, 1997,22 (3): 1-7) such as thermal characteristics is poor, on the high side.
Three, summary of the invention
The purpose of this invention is to provide a kind of intensity, thermostability that can improve green-ball, can improve iron ore pellets of pellet ore reduction, reduction degradation performance, reduction swellability performance and soft heat performance and preparation method thereof.This method neither increase facility investment, again do not change original production technique, do not increase cost and can improve pellet quality yet.
For achieving the above object, the technical solution used in the present invention is: add the forsterite of 2～4wt% and the binding agent of 0.2～0.8wt% in iron ore, add the water mixing, the water content that adds in the compound behind the water mixing is 6～11wt%; Reproducing ball, drying, is that preheating under 900～1000 ℃ of conditions, warm up time are 15～25min in temperature then; Be roasting under 1260～1320 ℃ of conditions in temperature at last, roasting time is 20～40min.
Binding agent is that percentage composition carries out the fine grinding mixing with sodium starch glycolate 20～40%, polyacrylamide 5～10%, polypropylene 0～5%, Sodium salts humic acids 0～5%, water-proof putty powder 20～40%, kaolin 3～5%, ferrous sulfate 5～10%, yellow soda ash 5～10% by weight.
Described iron ore is: TFe is that 58～68 wt%, CaO are that 0～2wt%, MgO are 0～3 wt%, SiO
2Be 2～8 wt%, Al
2O
3Be that 0～0.8wt%, S are 0～0.5wt%.
The MgO weight percentage of described forsterite is more than 40%; The forsterite granularity is≤content 〉=90% of 0.074mm.
Because adopt technique scheme, the present invention can improve pellet quality, improves the pelletizing performance comprehensively.Adopt new binding agent and add other binding agent and compare: it is individual that green ball strength can improve that 2.0～5.0 times/0.5m, burst temperature can improve about 100～150 ℃, pelletizing TFe content is high approximately by 1.5～2.0%, pelletizing ultimate compression strength improves 200～500N/.
The present invention makes the pellet metallurgical performance obtain very significantly improving owing to added forsterite, and its index is far superior to conventional acidic pellet ore, has improved the metallurgical performance of pellet effectively.
In a word, the present invention can improve intensity, the thermostability of green-ball, can improve pellet ore reduction swellability performance, soft heat performance, reduction degradation performance, reductibility.And do not increasing facility investment, do not changing under the condition of original production technique and can obviously improve the iron ore pellets quality again.
The present invention also has following advantage to blast-furnace smelting: can increase the flowability of slag, can improve reflowing temperature, reduction cohesive zone, compression dropping zone, the reduction SiO of furnace charge
2Activity, desulfurization in helping smelting, reduction coke ratio, and suppress the basic metal circulation.
Four, embodiment
A kind of preparation method of iron ore pellets, its embodiment is:
1, the iron ore of present embodiment employing is: TFe is that 63～66wt%, CaO are that 1～2wt%, MgO are 1～3wt%, SiO
2Be 4～6wt%, Al
2O
3Be that 0.2～0.3wt%, S are 0.05～0.2wt%;
2, the binding agent that adopts of present embodiment is: binding agent be by weight percentage composition just sodium starch glycolate 25～35%, polyacrylamide 5～10%, Sodium salts humic acids 1～5%, water-proof putty powder 30～40%, kaolin 3～5%, ferrous sulfate 8～10%, yellow soda ash 5～10% carry out fine grinding and mix, fine grinding is≤content 〉=80% of 0.074mm granularity.The molecular weight of polyacrylamide is more than 3,000,000.
3, the preparation method of present embodiment is: add forsterite 2.5～3.5wt%, binding agent 0.3～0.5wt% in iron ore concentrate.Wherein, forsterite is≤granularity content 〉=90% of 0.074mm, the MgO of forsterite is more than the 40%wt%.Add the water mixing earlier, the water content that adds in the compound behind the water mixing is 7～10wt%; Reproducing ball, drying, is that preheating under 900～950 ℃ of conditions, warm up time are 15～20min in temperature then; Be roasting under 1260～1300 ℃ of conditions in temperature at last, roasting time is 30～35min.
4, the detected result of present embodiment is: detect its ultimate compression strength and other performances after the cooling fully.The physical and chemical performance result contrast of this pellet sees the following form 1, and the metallurgical performance contrast sees Table 2.
The contrast of table 1 pellet physical and chemical performance
| Condition binding agent kind | Forsterite addition/% | Finished ball intensity | Chemical ingredients/% | ||||||
| Ultimate compression strength/N/ | Tumbler index+6.3mm, % | Abrasion resistance index/-0.5mm, % | TFe | FeO | MgO | CaO | SiO 2 | ||
| Wilkinite | 0 3 | 2873 3025～ | 90.33 92.00 | 4.50 3.31 | 64.07 62.67 | 0.65 1.05 | 1.91 3.09 | 1.17 1.03 | 4.65 5.28 |
| The binding agent that the present invention adopts | 0 3 | 2846 3141 | 92.66 90.85 | 4.31 4.18 | 64.86 63.39 | 0.43 0.85 | 1.95 2.89 | 1.14 1.05 | 4.06 5.17 |
The contrast of table 2 pellet metallurgical performance
| The binding agent kind | Forsterite addition/% | Reduction degree RI/% | Reduction degradation index RD 1-3.15 /％ | Reduction swellability rate RSI/% | Ta/ ℃ of softening beginning | Softening end of a period Ts/ ℃ | Melt-dropping property | |||
| Between the softened zone Ts-a/ ℃ | M/ ℃ of drippage temperature T | Interval Tm-s/ ℃ of soft heat | Maximum differential pressure/Pa under the molten state | |||||||
| Wilkinite | 0 3 | 69.41 75.22 | 15.59 7.3 | 15.61 7.17 | 1016 1151 | 1205 1303 | 189 152 | 1406 1471 | 201 168 | 3820 2401 |
| The binding agent that the present invention adopts | 0 3 | 71.36 77.48 | 11.5 9.18 | 10.84 6.81 | 1003 1153 | 1198 1310 | 195 157 | 1357 1478 | 159 168 | 2958 1978 |
From table 1, table 2 as can be seen, owing to add forsterite, finished pellet mining and metallurgy gold performance has obtained very significantly improving; The pelletizing reduction degree increases, and maximum increase rate is about 14%; Pelletizing low temperature reduction degradation index and expansion character are significantly improved, RDI
-3.15Minimumly drop to 5.50%, the maximum range of decrease is 64.7%; RSI is minimum to drop to 6.86%, and the maximum range of decrease is 56.0%.Index is far superior to conventional acidic pellet ore, has effectively improved the metallurgical performance of pelletizing.
In a word, present embodiment has improved intensity, the thermostability of green-ball, has improved pellet ore reduction swellability performance, soft heat performance, reduction degradation performance, reductibility, both needn't increase facility investment, original production technique must be do not changed again, the quality of iron ore pellets can be improved.
Present embodiment also has the flowability that can increase slag, the reflowing temperature that can improve furnace charge, reduces cohesive zone, compresses dropping zone, reduces SiO blast-furnace smelting
2Activity, help smelting in desulfurization, can reduce coke ratio, suppress basic metal round-robin advantage.
Claims (4)
1, a kind of preparation method of iron ore pellets is characterized in that adding the forsterite of 2～4wt% and the binding agent of 0.2～0.8wt% in iron ore, add the water mixing, and the water content that adds in the compound behind the water mixing is 6～11wt%; Reproducing ball, drying, is that preheating under 900～1000 ℃ of conditions, warm up time are 15～25min in temperature then; Be roasting under 1260～1320 ℃ of conditions in temperature at last, roasting time is 20～40min;
Binding agent is that percentage composition carries out the fine grinding mixing with sodium starch glycolate 20～40%, polyacrylamide 5～10%, polypropylene 0～5%, Sodium salts humic acids 0～5%, water-proof putty powder 20～40%, kaolin 3～5%, ferrous sulfate 5～10%, yellow soda ash 5～10% by weight.
2, the preparation method of iron ore pellets according to claim 1 is characterized in that described iron ore is, TFe is that 58～68wt%, CaO are that 0～2wt%, MgO are 0～3wt%, SiO
2Be 2～8wt%, Al
2O
3Be that 0～0.8wt%, S are 0～0.5wt%.
3, the preparation method of iron ore pellets according to claim 1, the MgO weight percentage that it is characterized in that described forsterite is more than 40%.
4, the preparation method of iron ore pellets according to claim 1 is characterized in that content 〉=90% of described forsterite granularity for≤0.074mm.
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| CNB2006100182999A CN100348744C (en) | 2006-01-25 | 2006-01-25 | Iron ore pellet and its preparation method |
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|---|---|---|---|
| CNB2006100182999A CN100348744C (en) | 2006-01-25 | 2006-01-25 | Iron ore pellet and its preparation method |
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| CN100348744C true CN100348744C (en) | 2007-11-14 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100562589C (en) * | 2007-12-27 | 2009-11-25 | 钢铁研究总院 | A kind of iron ore pellets sodium bentonite based binder and preparation method thereof |
| CN101906533B (en) * | 2010-08-23 | 2012-01-25 | 首钢总公司 | Low-silicon magnesium-containing pellets and production method thereof |
| CN101956064A (en) * | 2010-10-16 | 2011-01-26 | 山西太钢不锈钢股份有限公司 | Method for improving cracking temperature of ultrafine-granularity iron ore concentrate powder pellet ore |
| CN102021318A (en) * | 2010-12-22 | 2011-04-20 | 武汉钢铁(集团)公司 | Magnesian self-fluxed pellet and preparation method thereof |
| CN102094117B (en) * | 2011-01-20 | 2012-07-04 | 嵇建国 | Binder, preparation method of binder and application of binder used as metallurgical pellet binder |
| CN102605178B (en) * | 2012-03-22 | 2014-12-10 | 滕先弟 | Iron-based pelletizing binder and preparation method thereof |
| CN102899429A (en) * | 2012-09-19 | 2013-01-30 | 秦皇岛赛文冶金科技有限公司 | Blast furnace smelting raw material modifier |
| CN106381383A (en) * | 2015-07-27 | 2017-02-08 | 宝山钢铁股份有限公司 | Anti-cohesion alkaline pellet and manufacturing method thereof |
| CN106755985A (en) * | 2016-12-20 | 2017-05-31 | 江苏省冶金设计院有限公司 | The composite dry powder binding agent and iron powder forming method of iron powder shaping |
| CN106978533A (en) * | 2017-03-01 | 2017-07-25 | 江苏省冶金设计院有限公司 | Prepare the method and system of gas-based shaft kiln acid pellet |
| CN110551902B (en) * | 2019-09-11 | 2021-01-29 | 武汉理工大学 | Method for recycling fayalite type slag resources |
| CN115341092B (en) * | 2022-08-22 | 2024-03-29 | 云南玉溪玉昆钢铁集团有限公司 | Additive production and preparation method for magnesia and alkaline pellets |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4199348A (en) * | 1978-06-07 | 1980-04-22 | International Minerals & Chemical Corporation | Mineral ore pellets |
| CN1153218A (en) * | 1995-12-27 | 1997-07-02 | 北京科技大学 | Iron ore pellet compound additive |
| CN1662665A (en) * | 2002-05-10 | 2005-08-31 | 洛萨瓦拉-基鲁纳瓦拉公司 | Method to improve iron production rate in a blast furnace |
-
2006
- 2006-01-25 CN CNB2006100182999A patent/CN100348744C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4199348A (en) * | 1978-06-07 | 1980-04-22 | International Minerals & Chemical Corporation | Mineral ore pellets |
| CN1153218A (en) * | 1995-12-27 | 1997-07-02 | 北京科技大学 | Iron ore pellet compound additive |
| CN1662665A (en) * | 2002-05-10 | 2005-08-31 | 洛萨瓦拉-基鲁纳瓦拉公司 | Method to improve iron production rate in a blast furnace |
Non-Patent Citations (2)
| Title |
|---|
| 橄榄石在高炉生产中的作用 J.,W. Cu，Currier，邱实.烧结球团，第5期 1989 * |
| 镁橄榄石在铁矿球团中的应用试验研究 陈铁军，张一敏，王昌安，胡承凡.烧结球团，第30卷第2期 2005 * |
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| CN1807662A (en) | 2006-07-26 |
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