CN104694745A - Preparation method of pellets for blast furnace smelting - Google Patents
Preparation method of pellets for blast furnace smelting Download PDFInfo
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- CN104694745A CN104694745A CN201510098396.2A CN201510098396A CN104694745A CN 104694745 A CN104694745 A CN 104694745A CN 201510098396 A CN201510098396 A CN 201510098396A CN 104694745 A CN104694745 A CN 104694745A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a preparation method of pellets for blast furnace smelting. The method comprises the following steps: (1) punching steel melting sludge into a plate-and-frame filter press to form steel-melting sludge with the water content of 8-11 percent; (2) pouring the steel melting sludge subjected to press filtration into a sludge tank to be soaked so as to form a steel melting sludge finished product with the water content of 25-35 percent; (3) inputting the 2-3 percent by mass of steel melting sludge, 30-40 percent by mass of Ukraine flavor powder, 15-25 percent by mass of northeast flavor powder, 30-40 percent by mass of Aukoala flavor powder and 1.8-2.2 percent by mass of bentonite used as pellet raw materials into a damp mill to be fully mixed; (4) making the five pellet raw materials which are uniformly mixed by a pelletizing disc into green pellets with the diameters of 6.3-20 mm; (5) then roasting the green pellets in a vertical furnace and performing reaction for 4-5 hours to form cooked pellets. The method has the advantage of improving the grade of pellet iron.
Description
Technical field
The present invention relates to a kind of preparation method of blast-furnace smelting pelletizing.
Background technology
Pelletizing (also claim " ripe pelletizing) be blast furnace burden important in Iron And Steel Industry.The pelletizing preparation method used at present is: first using Ukraine's fine powder common in the market, northeast fine powder, Australia's OK a karaoke club fine powder, wilkinite totally four kinds of raw materials drop in damp mill as pellet feed, send in balling disk (-sc) after damp mill fully mixes and form green pellets, and then the green pellets formed by balling disk (-sc) is sent into calcination in shaft furnace and forms ripe pelletizing.: wilkinite is the important source material of producing pelletizing, and it is binding agent all fine powder bondings are made the green pellets of some strength in the shortcoming of above-mentioned pelletizing preparation method.Due in wilkinite not iron content and its major ingredient is content >=70% of SiO2(SiO2), therefore addition of bentonite in pelletizing, the iron-holder that can reduce pelletizing is (more with addition of amount, then the iron-holder of pelletizing is lower), when the pelletizing of low iron, after entering stove smelting as blast furnace raw material, greatly can increase the waste residue amount in blast furnace, absorb heat in stove simultaneously, increase the consumption of coke, and then reduce blast-furnace smelting efficiency; And bentonitic cost is higher, and then considerably increase the production and application cost of enterprise.Due in Iron And Steel Industry, steel-smelting sewage sludge is the primary product of steelworks final dusting, the iron level of steel-smelting sewage sludge is higher is about 54-55%, and the viscosity of steel-smelting sewage sludge and surmise and all reach binding agent ingredient requirement, current iron and steel enterprise is all generally by being dried by steel-smelting sewage sludge, sinter after fragmentation again, very easily cause environmental pollution.
Summary of the invention
The object of this invention is to provide one and can reduce enterprise's production and application cost, the preparation method of a kind of blast-furnace smelting pelletizing of pelletizing Iron grade can be improved again.
For achieving the above object, present invention employs following technical scheme: the preparation method of described a kind of blast-furnace smelting pelletizing, comprises the following steps:
(1) first get in plate-and-frame filter press with water pump by the steel-smelting sewage sludge in sludge sump, then steel-smelting sewage sludge filters 7 ~ 10 minutes by plate-and-frame filter press under the filter pressure of 0.6MPa, and forming water content is the steel-smelting sewage sludge of 8 ~ 11%;
(2) steel-smelting sewage sludge being then 8 ~ 11% by water content after plate-and-frame filter press press filtration is again poured in sludge sump and is soaked 3 ~ 5 minutes, and then the steel-smelting sewage sludge after again soaking is taken out from sludge sump, form the finished product steel-smelting sewage sludge that water content is 25 ~ 35%;
(3) needed for shaft furnace, then produce the raw material gross weight of pelletizing, by finished product steel-smelting sewage sludge, Ukraine's fine powder, northeast fine powder, Australia's OK a karaoke club fine powder, wilkinite totally five kinds of raw materials drops in damp mill as pellet feed and by following weight percent and fully mixes, the add-on of described finished product steel-smelting sewage sludge accounts for 2 ~ 3% of raw material gross weight, the add-on of described Ukraine fine powder accounts for 30 ~ 40% of raw material gross weight, the add-on of described northeast fine powder accounts for 15 ~ 25% of raw material gross weight, the add-on of described Australia OK a karaoke club fine powder accounts for 30 ~ 40% of raw material gross weight, described bentonitic add-on accounts for 1.8 ~ 2.2% of raw material gross weight,
(4) then five kinds of pellet feeds after mixing through damp mill are sent into balling disk (-sc)s, five kinds of pellet feeds after mixing are made into the green pellets that diameter is 6.3 ~ 20mm by balling disk (-sc);
(5) green pellets be then made into by balling disk (-sc) is sent in shaft furnace again, and green pellets calcination in vertical furnace forms ripe pelletizing in 4 ~ 5 hours.
Further, the preparation method of aforesaid a kind of blast-furnace smelting pelletizing, wherein: the add-on of described finished product steel-smelting sewage sludge accounts for 2% of raw material gross weight.
Further, the preparation method of aforesaid a kind of blast-furnace smelting pelletizing, wherein: the add-on of described Ukraine fine powder accounts for 36% of raw material gross weight.
Further, the preparation method of aforesaid a kind of blast-furnace smelting pelletizing, wherein: the add-on of described northeast fine powder accounts for 24% of raw material gross weight.
Further, the preparation method of aforesaid a kind of blast-furnace smelting pelletizing, wherein: the add-on of described Australia OK a karaoke club fine powder accounts for 36% of raw material gross weight.
Further, the preparation method of aforesaid a kind of blast-furnace smelting pelletizing, wherein: described bentonitic add-on accounts for 2% of raw material gross weight.
Further, the preparation method of aforesaid a kind of blast-furnace smelting pelletizing, wherein: green pellets forms ripe pelletizing in 4.5 hours in shaft furnace reaction in furnace.
By the enforcement of technique scheme, the invention has the beneficial effects as follows: (1) by using steel-smelting sewage sludge together with wilkinite as production pelletizing needed for binding agent, on the one hand, because steel-smelting sewage sludge is cheap, and then greatly reduce the production and application cost of enterprise; On the other hand, reduce bentonitic with addition of amount, and because the iron level in steel-smelting sewage sludge enriches, thus make the Iron grade of pelletizing increase, the Iron grade of the pelletizing adopting steel-smelting sewage sludge to produce can exceed 0.1% than the Iron grade of the pelletizing not adopting steel-smelting sewage sludge to produce, blast furnace feeding grade is also than front improve 0.01% simultaneously, and decreases the waste residue amount in blast-furnace smelting, substantially increases blast-furnace smelting efficiency; (2) again steel-smelting sewage sludge need not be carried out sintering processes; decrease one manufacturing procedure, greatly reduce environmental pollution again simultaneously, protect environmental quality; and the benefit produced after steel-smelting sewage sludge is used for pellet formation comparatively sinters the benefit of rear generation, many create beneficial results 119 yuan/ton per ton.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment one
A preparation method for blast-furnace smelting pelletizing, comprises the following steps:
(1) first get in plate-and-frame filter press with water pump by the steel-smelting sewage sludge in sludge sump, then steel-smelting sewage sludge is filtered 8 minutes by plate-and-frame filter press under the filter pressure of 0.6MPa, and forming water content is the steel-smelting sewage sludge of 10%;
(2) steel-smelting sewage sludge being then 10% by water content after plate-and-frame filter press press filtration is again poured in sludge sump and is soaked 4 minutes, and then is taken out from sludge sump by the steel-smelting sewage sludge after again soaking, and forms the finished product steel-smelting sewage sludge that water content is 30%;
(3) needed for shaft furnace, then produce the raw material gross weight of pelletizing, by finished product steel-smelting sewage sludge, Ukraine's fine powder, northeast fine powder, Australia's OK a karaoke club fine powder, wilkinite totally five kinds of raw materials drops in damp mill as pellet feed and by following weight percent and fully mixes, the add-on of described finished product steel-smelting sewage sludge accounts for 2% of raw material gross weight, the add-on of described Ukraine fine powder accounts for 36% of raw material gross weight, the add-on of described northeast fine powder accounts for 24% of raw material gross weight, the add-on of described Australia OK a karaoke club fine powder accounts for 36% of raw material gross weight, described bentonitic add-on accounts for 2% of raw material gross weight,
(4) then five kinds of pellet feeds after mixing through damp mill are sent into balling disk (-sc)s, five kinds of pellet feeds after mixing are made into the green pellets that diameter is 15mm by balling disk (-sc);
(5) green pellets be then made into by balling disk (-sc) drops in shaft furnace again, and green pellets calcination in vertical furnace forms ripe pelletizing in 4.5 hours.
Embodiment two
A preparation method for blast-furnace smelting pelletizing, is characterized in that: comprise the following steps:
(1) first get in plate-and-frame filter press with water pump by the steel-smelting sewage sludge in sludge sump, then steel-smelting sewage sludge is filtered 7 minutes by plate-and-frame filter press under the filter pressure of 0.6MPa, and forming water content is the steel-smelting sewage sludge of 8%;
(2) steel-smelting sewage sludge being then 8% by water content after plate-and-frame filter press press filtration is again poured in sludge sump and is soaked 3 minutes, and then is taken out from sludge sump by the steel-smelting sewage sludge after again soaking, and forms the finished product steel-smelting sewage sludge that water content is 25%;
(3) needed for shaft furnace, then produce the raw material gross weight of pelletizing, by finished product steel-smelting sewage sludge, Ukraine's fine powder, northeast fine powder, Australia's OK a karaoke club fine powder, wilkinite totally five kinds of raw materials drops in damp mill as pellet feed and by following weight percent and fully mixes, the add-on of described finished product steel-smelting sewage sludge accounts for 3% of raw material gross weight, the add-on of described Ukraine fine powder accounts for 30% of raw material gross weight, the add-on of described northeast fine powder accounts for 25% of raw material gross weight, the add-on of described Australia OK a karaoke club fine powder accounts for 40% of raw material gross weight, described bentonitic add-on accounts for 2% of raw material gross weight,
(4) then five kinds of pellet feeds after mixing through damp mill are sent into balling disk (-sc)s, five kinds of pellet feeds after mixing are made into the green pellets that diameter is 6.3mm by balling disk (-sc);
(5) green pellets be then made into by balling disk (-sc) drops in shaft furnace again, and green pellets calcination in vertical furnace forms ripe pelletizing in 4 hours.
Embodiment three
A preparation method for blast-furnace smelting pelletizing, is characterized in that: comprise the following steps:
(1) first get in plate-and-frame filter press with water pump by the steel-smelting sewage sludge in sludge sump, then steel-smelting sewage sludge is filtered 10 minutes by plate-and-frame filter press under the filter pressure of 0.6MPa, and forming water content is the steel-smelting sewage sludge of 11%;
(2) steel-smelting sewage sludge being then 11% by water content after plate-and-frame filter press press filtration is again poured in sludge sump and is soaked 5 minutes, and then is taken out from sludge sump by the steel-smelting sewage sludge after again soaking, and forms the finished product steel-smelting sewage sludge that water content is 35%;
(3) needed for shaft furnace, then produce the raw material gross weight of pelletizing, by finished product steel-smelting sewage sludge, Ukraine's fine powder, northeast fine powder, Australia's OK a karaoke club fine powder, wilkinite totally five kinds of raw materials drops in damp mill as pellet feed and by following weight percent and fully mixes, the add-on of described finished product steel-smelting sewage sludge accounts for 2% of raw material gross weight, the add-on of described Ukraine fine powder accounts for 40% of raw material gross weight, the add-on of described northeast fine powder accounts for 15.8% of raw material gross weight, the add-on of described Australia OK a karaoke club fine powder accounts for 40% of raw material gross weight, described bentonitic add-on accounts for 2.2% of raw material gross weight,
(4) then five kinds of pellet feeds after mixing through damp mill are sent into balling disk (-sc)s, five kinds of pellet feeds after mixing are made into the green pellets that diameter is 20mm by balling disk (-sc);
(5) green pellets be then made into by balling disk (-sc) drops in shaft furnace again, and green pellets calcination in vertical furnace forms ripe pelletizing in 5 hours.
Advantage of the present invention is: (1) by using steel-smelting sewage sludge together with wilkinite as production pelletizing needed for binding agent, on the one hand, because steel-smelting sewage sludge is cheap, and then greatly reduce the production and application cost of enterprise; On the other hand, reduce bentonitic with addition of amount, and because the iron level in steel-smelting sewage sludge enriches, thus make the Iron grade of pelletizing increase, the Iron grade of the pelletizing adopting steel-smelting sewage sludge to produce can exceed 0.1% than the Iron grade of the pelletizing not adopting steel-smelting sewage sludge to produce, blast furnace feeding grade is also than front improve 0.01% simultaneously, and decreases the waste residue amount in blast-furnace smelting, substantially increases blast-furnace smelting efficiency; (2) again steel-smelting sewage sludge need not be carried out sintering processes; decrease one manufacturing procedure, greatly reduce environmental pollution again simultaneously, protect environmental quality; and the benefit produced after steel-smelting sewage sludge is used for pellet formation comparatively sinters the benefit of rear generation, many create beneficial results 119 yuan/ton per ton.
Claims (7)
1. a preparation method for blast-furnace smelting pelletizing, is characterized in that: comprise the following steps:
(1) first get in plate-and-frame filter press with water pump by the steel-smelting sewage sludge in sludge sump, then steel-smelting sewage sludge filters 7 ~ 10 minutes by plate-and-frame filter press under the filter pressure of 0.6MPa, and forming water content is the steel-smelting sewage sludge of 8 ~ 11%;
(2) steel-smelting sewage sludge being then 8 ~ 11% by water content after plate-and-frame filter press press filtration is again poured in sludge sump and is soaked 3 ~ 5 minutes, and then the steel-smelting sewage sludge after again soaking is taken out from sludge sump, form the finished product steel-smelting sewage sludge that water content is 25 ~ 35%;
(3) needed for shaft furnace, then produce the raw material gross weight of pelletizing, by finished product steel-smelting sewage sludge, Ukraine's fine powder, northeast fine powder, Australia's OK a karaoke club fine powder, wilkinite totally five kinds of raw materials drops in damp mill as pellet feed and by following weight percent and fully mixes, the add-on of described finished product steel-smelting sewage sludge accounts for 2 ~ 3% of raw material gross weight, the add-on of described Ukraine fine powder accounts for 30 ~ 40% of raw material gross weight, the add-on of described northeast fine powder accounts for 15 ~ 25% of raw material gross weight, the add-on of described Australia OK a karaoke club fine powder accounts for 30 ~ 40% of raw material gross weight, described bentonitic add-on accounts for 1.8 ~ 2.2% of raw material gross weight,
(4) then five kinds of pellet feeds after mixing through damp mill are sent into balling disk (-sc)s, five kinds of pellet feeds after mixing are made into the green pellets that diameter is 6.3 ~ 20mm by balling disk (-sc);
(5) green pellets be then made into by balling disk (-sc) is sent in shaft furnace again, and green pellets calcination in vertical furnace forms ripe pelletizing in 4 ~ 5 hours.
2. the preparation method of a kind of blast-furnace smelting pelletizing according to claim 1, is characterized in that: the add-on of described finished product steel-smelting sewage sludge accounts for 2% of raw material gross weight.
3. the preparation method of a kind of blast-furnace smelting pelletizing according to claim 1, is characterized in that: the add-on of described Ukraine fine powder accounts for 36% of raw material gross weight.
4. the preparation method of a kind of blast-furnace smelting pelletizing according to claim 1, is characterized in that: the add-on of described northeast fine powder accounts for 24% of raw material gross weight.
5. the preparation method of a kind of blast-furnace smelting pelletizing according to claim 1, is characterized in that: the add-on of described Australia OK a karaoke club fine powder accounts for 36% of raw material gross weight.
6. the preparation method of a kind of blast-furnace smelting pelletizing according to claim 1, is characterized in that: described bentonitic add-on accounts for 2% of raw material gross weight.
7. the preparation method of a kind of blast-furnace smelting pelletizing according to claim 1, is characterized in that: green pellets forms ripe pelletizing in 4.5 hours in shaft furnace reaction in furnace.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108103308A (en) * | 2016-11-25 | 2018-06-01 | 上海梅山钢铁股份有限公司 | A kind of device and method for steel-smelting sewage sludge pelletizing |
| CN110699543A (en) * | 2019-11-22 | 2020-01-17 | 中南大学 | Method for preparing iron ore sintered pellet binder by using steel oily sludge, binder and application |
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| CN110699543A (en) * | 2019-11-22 | 2020-01-17 | 中南大学 | Method for preparing iron ore sintered pellet binder by using steel oily sludge, binder and application |
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Application publication date: 20150610 |