CN102658263B - Screening treatment method for imported lump ores for iron smelting - Google Patents
Screening treatment method for imported lump ores for iron smelting Download PDFInfo
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- CN102658263B CN102658263B CN2012101314261A CN201210131426A CN102658263B CN 102658263 B CN102658263 B CN 102658263B CN 2012101314261 A CN2012101314261 A CN 2012101314261A CN 201210131426 A CN201210131426 A CN 201210131426A CN 102658263 B CN102658263 B CN 102658263B
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Abstract
The invention relates to a screening treatment method for imported lump ores for iron smelting. According to the technical scheme, the method comprises the following steps of: for the imported lump ores which are frozen in winter, mixing pellets or returned pellets and the imported lump ores according to a ratio of 1: (1-4), standing for 8 to 24 hours, and performing screening twice, wherein the primary screening aperture is 5 millimeters, and the secondary screening aperture is 20 millimeters; and for the imported lump ores which are large in water content and cannot be frozen, mixing ores returned by a blast furnace and the imported lump ores according to a ratio of 1: (1-4), standing for more than 4 hours, and performing screening, wherein the screening aperture is 10 millimeters. The screening treatment method has the advantages that the imported lump ores can be screened without being influenced by water content or viscosity, the requirement of the blast furnace on the particle size of the lump ores is reduced, and the requirement of a factory for purchasing the lump ores is reduced; and therefore, a part of imported lump ores which are low in cost and can hardly be screened can be used, and the production cost is reduced.
Description
Technical field
The present invention relates to a kind of method for sieving of smelting iron the high or imported lump ore that water content is large of screening processing method, particularly viscosity with imported lump ore, belong to metallurgy industry iron-smelting raw material preparation techniques field.
Background technology
At present, ironmaking use imported lump ore has been the general knowledge of metallurgy industry directly into the stove smelting.Blast furnace is used the granularity requirements of lump ore to be 10-60mm, generally in imported lump ore, is greater than the less of 60mm, but the following powder of 10mm accounts for 10-50% according to the difference of lump ore quality, do not wait, so blast furnace must be through screening before using lump ore.The equipment major part of ironmaking screening lump ore is common shaking-sieving device, also has part producer to adopt the drum screen separating device, and its sieve is divided mesh screen, bar sieve mesh, mostly is the 10mm aperture.Imported lump ore enters blast furnace process after bolting, under sieve, be less than the 10mm powder and transport the sintering use.
The problem existed is:
1, the existing market lump ore is of a great variety, and quality differs, and the partial block mineral water divides large or viscosity is high, no matter uses which kind of lump ore sieve, all because of not blanking of Hatch Opening or screen cloth space, is clung by powder, cause lump ore to sieve or screening effect very poor, blast furnace can't be used.And this class imported lump ore resource low price often has higher cost performance in production cost.
2, north of china in winter cold, lump ore are formed by moisture effects to freeze piece to sieve, and adopt the method efficiency of manually beating very low, and usage mining machine or other machinery is broken freezes that the piece effect is bad and expense is higher.Lump ore froze piece powder and lump ore was frozen in to one winter, even powder also is frozen into piece, can't screen in screening, enter blast furnace after powder separated by temperatures involved, conditions of blast furnace is made a very bad impression, therefore cause the ratio of north of china in winter lump ore effectively to improve.
3, the lump ore screening plant mostly is outdoor study, during rainy season in lump ore excessive causing of water content can't sieve.Affected the lifting of blast furnace lump ore ratio.
Summary of the invention
The purpose of this invention is to provide a kind of screening processing method of using imported lump ore of smelting iron, make imported lump ore not be subjected to the impact of contained humidity or viscosity, not all can sieve by the impact of seasonal variations, meet the requirement of blast furnace to the lump ore grade.Solve the problems referred to above that background technology exists.
Technical scheme of the present invention is:
For the different situations of ironmaking with imported lump ore, carry out respectively different screenings and process:
(1) imported lump ore of piece appears freezing winter:
The imported lump ore that described winter occurs freezing piece refers to before imported lump ore sieves in the winter time and the phenomenon that freezes occurs, at first pellet or the pellet screening ratio (mass ratio) according to 1:1-4 is mixed with imported lump ore, after standing 8-24 hours, carry out regrading, once sieving aperture is 5mm, screenings is that imported lump ore powder or pellet are returned mine, and is transported to after sintering is chemically examined composition and uses as raw material; Oversize carries out regrading, the regrading aperture is 20mm, its screenings of regrading is pellet and 5-20mm imported lump ore, being transported to blast furnace uses, oversize is the above imported lump ore of 20mm, is transported to blast furnace and uses, and described pellet or pellet screening temperature are more than 200 ℃, the pellet granularity is 5-20mm, and the pellet screening granularity is less than 5mm;
(2) moisture is large and without the imported lump ore that freezes piece:
The imported lump ore that described moisture is large refers to that moisture is greater than the imported lump ore of 10% (mass ratio), without freezing piece, refer to that the phenomenon that freezes does not appear in imported lump ore in the winter time, the ratio (mass ratio) of BF return fines according to 1:1-4 mixed with imported lump ore, standing more than 4 hours after, sieve, the screening aperture is 10mm, described BF return fines is sintering deposit and the pellet powder that is less than 5mm, temperature is 30-60 ℃, and sinter return fine is loose structure, and water absorbing capacity is stronger.
3, moisture is little and without freezing the lump ore of piece
The imported lump ore that described moisture is little refers to that moisture is less than or equal to the 10%(mass ratio) imported lump ore, refer to that the phenomenon that freezes does not appear in imported lump ore in the winter time without freezing piece.Before entering blast furnace, directly sieve and get final product.
Good effect of the present invention is: imported lump ore is not subjected to the impact of contained humidity or viscosity, not all can sieve by the impact of seasonal variations, meets the requirement of blast furnace to the lump ore grade.Solved the difficult problem that factory causes the lump ore ratio to improve because of seasonal variations, reduced simultaneously the purchase requirement of factory to lump ore, the imported lump ore that the cheap difficult screening of part is used is used, thereby reduces production costs.
The accompanying drawing explanation
Fig. 1 is process chart of the present invention.
The specific embodiment
The present invention will be further described below by embodiment.
1, the imported lump ore of piece appears freezing winter
The imported lump ore that described winter occurs freezing piece refers to before imported lump ore sieves in the winter time and the phenomenon that freezes occurs.At first pellet is emitted before shaft furnace heat sieve, the pellet temperature is 200 ℃, and the pellet granularity is 5-20mm, is transported to the blast furnace stock ground with automobile.With loading machine, adopt pellet and imported lump ore 1:1(mass ratio) ratio mix, after being paved into the pyramid type stockpile, carry out secondary agitation, then collect together into the material buttress, standing 8 hours, observe steam on stockpile and disappear, after the lump ore skin drying, can carry out regrading, once sieving aperture is 5mm, and screenings is the imported lump ore powder, is transported to after sintering is chemically examined composition and uses as raw material; Oversize carries out regrading, and the regrading aperture is 20mm, and its screenings of regrading is pellet and 5-20mm imported lump ore, is transported to blast furnace and uses, and oversize is the above imported lump ore of 20mm, is transported to blast furnace and uses.
By temperature, be 200 ℃, granularity is the pellet screening of 5-20mm, is transported to the blast furnace stock ground with automobile, with loading machine, adopt pellet screening and imported lump ore 1:1(mass ratio) ratio mix, after being paved into the pyramid type stockpile, carry out secondary agitation, then collect together into the material buttress, standing 8 hours, observe steam on stockpile and disappear, can carry out regrading after the lump ore skin drying, once sieving aperture is 5mm, screenings is imported lump ore powder and pellet screening, is transported to after sintering is chemically examined composition and uses as raw material; Oversize carries out regrading, and the regrading aperture is 20mm, and its screenings of regrading is the 5-20mm imported lump ore, is transported to blast furnace and uses, and oversize is the above imported lump ore of 20mm, and be transported to blast furnace and use,
2, moisture is large and without the imported lump ore that freezes piece
The imported lump ore that described moisture is large refers to that moisture is greater than the 10%(mass ratio) imported lump ore, refer to that the phenomenon that freezes does not appear in imported lump ore in the winter time without freezing piece.By BF return fines according to the 1:2(mass ratio) ratio with imported lump ore, mix, after standing 4 hours, sieve, the screening aperture is 10mm, described BF return fines is sintering deposit and the pellet powder that is less than 5mm, and temperature is 40 ℃, and major part is sinter return fine simultaneously, sinter return fine is loose structure, and water absorbing capacity is stronger.
3, moisture is little and without freezing the lump ore of piece
The imported lump ore that described moisture is little refers to that moisture is less than or equal to the 10%(mass ratio) imported lump ore, refer to that the phenomenon that freezes does not appear in imported lump ore in the winter time without freezing piece.At feed bin, directly sieve and get final product.
Claims (1)
1. screening processing method of smelting iron with imported lump ore is characterized in that carrying out respectively different screenings and processing for the different situations of ironmaking with imported lump ore:
(1) imported lump ore of piece appears freezing winter:
The imported lump ore that described winter occurs freezing piece refers to before imported lump ore sieves in the winter time and the phenomenon that freezes occurs, at first pellet or the pellet screening ratio according to mass ratio 1:1-4 is mixed with imported lump ore, after standing 8-24 hours, carry out regrading, the aperture of screening for the first time in described regrading is 5mm, sieving for the first time screenings is imported lump ore powder or pellet screening, is transported to after sintering is chemically examined composition and uses as raw material; Sieving for the first time oversize sieves for the second time, sieving for the second time aperture is 20mm, sieving for the second time screenings is pellet and 5-20mm imported lump ore, being transported to blast furnace uses, sieving for the second time oversize is the above imported lump ore of 20mm, is transported to blast furnace and uses, and described pellet or pellet screening temperature are 200 ℃, the pellet granularity is 5-20mm, and the pellet screening granularity is less than 5mm;
(2) moisture is large and without the imported lump ore that freezes piece:
The imported lump ore that described moisture is large refers to that moisture is greater than the imported lump ore of 10% mass ratio, without freezing piece, refer to that the phenomenon that freezes does not appear in imported lump ore in the winter time, the ratio of BF return fines according to mass ratio 1:1-4 mixed with imported lump ore, standing more than 4 hours after, sieve, the screening aperture is 10mm, and described BF return fines is sintering deposit and the pellet powder that is less than 5mm, and temperature is 30-60 ℃.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103773948B (en) * | 2014-01-30 | 2015-08-26 | 首钢总公司 | A kind of method using powdered iron ore in ironmaking system |
| CN104313313A (en) * | 2014-10-29 | 2015-01-28 | 攀钢集团攀枝花钢钒有限公司 | Preparation method for granulating fine-particle fuel for sintering of iron ore in advance |
| CN105886753A (en) * | 2016-06-22 | 2016-08-24 | 中冶华天工程技术有限公司 | System and sintering process taking pellet return fines as embedded materials |
| CN111023845A (en) * | 2019-11-25 | 2020-04-17 | 攀钢集团攀枝花钢钒有限公司 | Utilization method of sinter waste heat of circular cooler |
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| CN201073637Y (en) * | 2007-07-27 | 2008-06-18 | 马鞍山钢铁股份有限公司 | Lump ore combination vibrating screen |
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| CN201073637Y (en) * | 2007-07-27 | 2008-06-18 | 马鞍山钢铁股份有限公司 | Lump ore combination vibrating screen |
| CN101254501A (en) * | 2008-01-30 | 2008-09-03 | 马鞍山钢铁股份有限公司 | Combination vibration sieve |
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Address after: 064200 South Road, Tangshan City, Hebei Province, No. 32 Patentee after: Tangshan Jianlong Special Steel Co., Ltd. Address before: 064200 South Road, Tangshan City, Hebei Province, No. 32 Patentee before: Jianlong Industrial Co., Ltd., Tangshan City |
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Effective date of registration: 20210319 Address after: No.32, Jianshe South Road, Zunhua City, Tangshan City, Hebei Province 064200 Patentee after: TANGSHAN JIANLONG JIANZHOU STEEL Co.,Ltd. Address before: 064200 No. 32 Jianshe South Road, Hebei, Tangshan City Patentee before: TANGSHAN JIANLONG SPECIAL STEEL Co.,Ltd. |