CN105217987A - The complex slag utilizing electric arc furnace restored slag and flyash to produce and preparation technology thereof - Google Patents
The complex slag utilizing electric arc furnace restored slag and flyash to produce and preparation technology thereof Download PDFInfo
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- CN105217987A CN105217987A CN201510554744.2A CN201510554744A CN105217987A CN 105217987 A CN105217987 A CN 105217987A CN 201510554744 A CN201510554744 A CN 201510554744A CN 105217987 A CN105217987 A CN 105217987A
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- slag
- flyash
- electric arc
- arc furnace
- complex
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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The present invention relates to a kind of complex slag utilizing electric arc furnace restored slag and flyash to produce, its component and weight percent thereof are: the electric arc furnace restored slag of 25 ~ 45%, the flyash of 55 ~ 75% and 0.5 ~ 5% admixture.Not only can improve concrete performance, reduce concrete production cost, and can whole process clean, thoroughly administer electric arc furnace restored slag and flyash to the destruction of ecotope, turn waste into wealth, save valuable resource.
Description
Technical field
The invention belongs to technical field of comprehensive utilization of solid waste, relate to a kind of complex slag and the preparation technology thereof that utilize electric arc furnace restored slag and flyash production.
Background technology
Reducing slag is the metallurgical industry waste residue given off in Electric furnace steel making production process, is commonly called as white slag.The chemical composition of reducing slag is SiO
225 ~ 35%, Al
2o
33 ~ 6%, Fe
2o
30.5 ~ 2%, CaO45 ~ 55%, basicity factor ［ CaO/ (SiO
2+ P
2o
5) be about 2, wherein have an appointment 6% f-CaO, the powder of about TFe5%, granularity 0 ~ 500mm(wherein < 5mm accounts for 80%), and also have the SO of about 1.5%
3.Its possible mineral composition is: gehlenite, diopside, manganolite, szaibelyite, calcite, calcium hydroxide or free calcium oxide, there are not the mineral of hydraulically active and potential hydraulically active, reducing slag can not be recycled, ash discharge land occupation, cause the deterioration of eco-land planning, in its discharge and storage process, propagate airborne dust in dry season with wind-force to billow and cause serious atmospheric pollution, producing again mud contamination surrounding enviroment in overcast and rainy season, is one of large industrial solid wastes needing recycling badly.
Flyash is the waste residue that fuel-burning power plant, industry and civil equipment are discharged, and its chemical composition is SiO
240 ~ 50%, Al
2o
330 ~ 35%, Fe
2o
34 ~ 6%, CaO1 ~ 5%, about TFe4% and a small amount of magnesium, sulphur, carbon etc.Its mineral composition mainly contains: lime feldspar, quartz, mullite, magnetite and pyrite, a large amount of siliceous vitreum (Al
2o
32SiO
2) and active SiO
2, active A l
2o
3and a small amount of unburned carbon etc.Flyash throws aside accumulation, the same with white slag in its discharge and storage process, propagate airborne dust in dry season with wind-force to billow and cause serious atmospheric pollution, producing again mud contamination surrounding enviroment in overcast and rainy season, is also one of large industrial solid wastes needing recycling badly.
Utilizing solid waste to produce New Building Materials is decreasing pollution thing quantity dischargeds, is also simultaneously that cement and concrete industry realize saving resource, the energy and green ecologicalization transition, the strategic choice of taking a new road to industrialization.In order to better adapt to the development of recycling economy, country supports that enterprise takes measures, and reduces Air Pollutant Emission, reduces environmental pollution, energy-saving and cost-reducing, and comprehensive utilization industrial residue, improves resource utilization.
How high efficient resourcing the problem that whole process is clean, thoroughly the large industrial solid wastes of process become a reality and sternness.Final realization makes full use of large industrial solid wastes, turns waste into wealth, environmental protect, saves the object that waste residue takes up an area.
Up to now, domestic electric arc furnace restored slag and the flyash of also not utilizing produces complex slag, as the precedent of concrete mineral admixture.
Summary of the invention
In order to overcome the shortcoming of above-mentioned technology, the invention provides a kind of complex slag and the preparation technology thereof that utilize electric arc furnace restored slag and flyash production, the complex slag that it can utilize electric arc furnace restored slag and flyash to produce performance index to be better than the seconds of GB/T1596-2005 " flyash in cement and concrete ", not only can improve concrete performance, reduce concrete production cost, and can whole process clean, thoroughly administer electric arc furnace restored slag and flyash to the destruction of ecotope, turn waste into wealth, save valuable resource.
The technical scheme that the present invention adopts for technical solution problem is: a kind of complex slag utilizing electric arc furnace restored slag and flyash to produce, and its component and weight percent thereof are: the electric arc furnace restored slag of 25 ~ 45%, the flyash of 55 ~ 75% and 0.5 ~ 5% admixture.
A kind of preparation technology of the complex slag utilizing electric arc furnace restored slag and flyash to produce, its preparation process is: with electric arc furnace restored slag and flyash for raw material, first to water content about 8% electric arc furnace restored slag carry out fragmentation, oven dry, sieve classification and dry type magnetic separation, reducing slag is crushed to below 20mm, moisture drying is reduced to < 2% to < 3%, TFe; Carry out size classification by going out grind materials and together feeding in powder separating machine by the flyash that technique proportioning is measured again, fine powder is specific surface area and is greater than 420m
2/ kg, 45 μm of square hole sieves tail over the complex slag of < 5%, and meal adds the admixture accounting for complex slag unit-hour output 0.5 ~ 5% and carries out closed-circuit grinding in return tube grinding machine again after dry type magnetic separation.
Described flyash can with cinder Some substitute or completely alternative, need when taking cinder as raw material first reduction ground-slag and cinder together to be fed in tuber grinder after metering and carry out closed-circuit grinding, if when raw material does not contain cinder, direct electric arc furnace restored slag is carried out fragmentation, oven dry, sieve classification and dry type magnetic separation after and together to feed in powder separating machine by the flyash that technique proportioning is measured and carry out size classification.
Described electric arc furnace restored slag and cinder are transported in the material storage yard that complex slag production line specifies from EAF steelmaking plant and heat power plant respectively by wagon tremie, and flyash is then transported in the ad hoc flyash bin of complex slag production line by bulk cement tanker.
Be provided with in described material storage yard rain-proof shelter for stacking reducing slag and for stack cinder rain-proof dust-proof between.
Described admixture is for can effectively excite Al in flyash
2o
32SiO
2the alkaline matter of lateral reactivity, as admixture commonly used by the concrete such as dihydrate gypsum, industrially desulfurized gypsum, sodium sulfate, Sodium Nitrite, trolamine.
the invention has the beneficial effects as follows:the electric arc furnace restored slag of 25 ~ 45% and the flyash of 55 ~ 75% can be utilized, add the admixture of 0.5 ~ 5%, adopt tuber grinder closed-circuit grinding technique, and carry out meticulously selecting iron with high-efficiency dry powder magnetic separator to powder separating machine meal, produce the complex slag that performance index are better than the seconds of GB/T1596-2005 " flyash in cement and concrete ", product TFe < 2%, the high grade silicate cement of equivalent substitution 20 ~ 30% can be used for the production of commerical ready-mixed concrete, not only can improve concrete performance, reduce concrete production cost, and can whole process clean, thorough improvement electric arc furnace restored slag and flyash are to the destruction of ecotope, turn waste into wealth, save valuable resource.
Embodiment
Below in conjunction with embodiment, the invention will be further described:
Utilize the complex slag that electric arc furnace restored slag and flyash are produced, its component and weight percent thereof are: the electric arc furnace restored slag of 25 ~ 45%, the flyash of 55 ~ 75% and 0.5 ~ 5% admixture.
A kind of preparation technology of the complex slag utilizing electric arc furnace restored slag and flyash to produce, its preparation process is: with electric arc furnace restored slag and flyash for raw material, first to water content about 8% electric arc furnace restored slag carry out fragmentation, oven dry, sieve classification and dry type magnetic separation, reducing slag is crushed to below 20mm, moisture drying is reduced to < 2% to < 3%, TFe; Carry out size classification by going out grind materials and together feeding in powder separating machine by the flyash that technique proportioning is measured again, fine powder is specific surface area and is greater than 420m
2/ kg, 45 μm of square hole sieves tail over the complex slag of < 5%, and meal adds the admixture accounting for complex slag unit-hour output 0.5 ~ 5% and carries out closed-circuit grinding in return tube grinding machine again after dry type magnetic separation.
Described flyash can with cinder Some substitute or completely alternative, need when taking cinder as raw material first reduction ground-slag and cinder together to be fed in tuber grinder after metering and carry out closed-circuit grinding, if when raw material does not contain cinder, direct electric arc furnace restored slag is carried out fragmentation, oven dry, sieve classification and dry type magnetic separation after and together to feed in powder separating machine by the flyash that technique proportioning is measured and carry out size classification.
Described electric arc furnace restored slag and cinder are transported in the material storage yard that complex slag production line specifies from EAF steelmaking plant and heat power plant respectively by wagon tremie, and flyash is then transported in the ad hoc flyash bin of complex slag production line by bulk cement tanker.
Be provided with in described material storage yard rain-proof shelter for stacking reducing slag and for stack cinder rain-proof dust-proof between.
Described admixture is for can effectively excite Al in flyash
2o
32SiO
2the alkaline matter of lateral reactivity, as admixture commonly used by the concrete such as dihydrate gypsum, industrially desulfurized gypsum, sodium sulfate, Sodium Nitrite, trolamine.
embodiment 1:
produce 150000 tons of reducing slags and flyash production complex slag per year
Starting material are electric arc furnace restored slag (wet slag), cinder (dry slag) and each 50,000 tons/year of flyash, reducing slag by wagon tremie from EAF steelmaking plant, cinder (dry slag) is transported in the material storage yard that complex slag factory specifies respectively by heat power plant that (reducing slag is Lightweight Steel Construction rain-proof shelter, cinder is between Lightweight Steel Construction rain-proof dust-proof), flyash (dry ash) is then transported in complex slag factory special-purpose bin by bulk cement tanker.
1, reducing slag is as component one, and after size classification, fragmentation, oven dry, deironing, upper storehouse enters mill
Have an appointment in electric arc furnace restored slag 5% metal charge (steel scrap, slag steel etc.), therefore need to carry out pre-treatment, loading sieve aperture by reducing slag forklift is in the vibratory screening apparatus of 20 × 20mm: oversize is transported to jaw crusher by rotary conveyor and carries out fragmentation, automatically slips and get back in reducing slag stockyard after fragmentation; Minus mesh is then sent in φ 1.5 × 12m rotating drum type drying machine by rotary conveyor and is dried, and dryer inlet temperature controls at 700 ~ 800 DEG C, makes material moisture content be reduced to less than 3% by 8%, drop temperature≤80 DEG C.Dryer thermal source is supplied by fluidizing furnace, and fluidizing furnace is that the bituminous coal of 5000 × 4.18kJ/kg is for fuel with calorific value; Send on machine at oversize and minus mesh belt and self-discharging type permanent-magnetic iron expeller be all housed, the steel scrap in slag and slag steel are selected rear being automatically discharged in interim stockyard, to reach after certain reserves again by forklift bunch to magnetic slag stockyard, regularly return steelworks.
Granular reducing slag after oven dry is then carried transporting in permanent-magnet drum type magnetic separator by chapelet and is carried out dry type magnetic separation, magnetic slag delivers to magnetic slag stockyard (regularly returning steelworks) by rotary conveyor, non magnetic slag is then carried by chapelet and is transported to the grinding head dedicated storehouse of reducing slag, bistrique is equipped with electronic belt scale under storehouse, and in storehouse, material carries out grinding as component after metering in the ball mill of speed-governing belt transfer roller feeding φ 2.4 × 8m two storehouses.
2, cinder is as component two, and upper storehouse enters mill
Cinder forklift loads elevating hopper, carried by chapelet again and transport to the grinding head dedicated storehouse of cinder, bistrique is equipped with electronic belt scale under storehouse, and in storehouse, cinder is after metering as component two, sends in tuber grinder carry out intergrinding with pretreated reducing slag through speed-governing belt transfer roller.
3, flyash is as component three, enters mill after first selection by winnowing
In flyash, particle diameter is less than the amount of 45 μm about 80%; therefore first selection by winnowing goes out the particulate ash of less than 45 μm as product; cinder then enters mill; namely the dry ash in flyash bin, through storehouse bottom tube formula quantitative spiral conveyor, air conveyer flume deliver in mill tail lift with go out abrasive flows and together send in FSF750 flyash special efficient vortex powder separator and carry out size classification and mix.The fine powder that particle diameter is less than 45 μm is carried through air conveyer flume and chapelet and being transported in products pot, then is transported to concrete mixing plant by bulk cement tanker and uses as mineral admixture; The meal that particle diameter is greater than 45 μm is carried transporting in permanent-magnet drum type magnetic separator by chapelet and is carried out magnetic separation, Armco magnetic iron remaining in meal is separated, magnetic meal is transported to magnetic slag (powder) stockyard (regularly returning steelworks) through chain hook conveyer, and non magnetic meal is then sent back in φ 2.4 × 8m ball mill by air conveyer flume and carried out closed-circuit grinding.
φ 1.5 × 12m rotating drum type drying machine and φ 2.4 × 8m ball mill afterbody are respectively provided with a PPC64-5 air box impulse bag-type dust-precipitator, magnetic separator and each dirt pits that produces are equipped with DMC (A)-64 unit impulse bag type dust collector, to ensure that emission concentration meets national standard at 30mg/Nm
3below, collected dust is sent in products pot.
4, admixture is added in powder separating machine meal
Non magnetic meal is being sent back in the way of tuber grinder by air conveyer flume, adds industrially desulfurized gypsum 3%, Sodium Nitrite 0.6%, trolamine 0.06% respectively by composite powder unit-hour output, using as effectively exciting aluminosilicate glass body (Al in flyash
2o
32SiO
2) chemical activator of lateral reactivity, chemical activator is dispersed in composite powder system when carrying out closed-circuit grinding.
Dryer and tuber grinder afterbody are without being provided with air box impulse bag-type dust-precipitator, and magnetic separator and each dirt pits that produces are equipped with unit impulse bag type dust collector, and to ensure that emission concentration meets national standard, collected dust is sent in products pot.
5, reducing slag and flyash complex slag technical target of the product
Reducing slag flyash complex slag technical indicator
Note: inspection methods and criteria performs GB/T1596-2005 " flyash in cement and concrete " (in table, C class represents: the calcium oxide content in reducing slag flyash complex slag is greater than 10%).
The present invention can utilize the electric arc furnace restored slag of 25 ~ 45% and the flyash of 55 ~ 75%, add the admixture of 0.5 ~ 5%, adopt tuber grinder closed-circuit grinding technique, and carry out meticulously selecting iron with high-efficiency dry powder magnetic separator to powder separating machine meal, produce the complex slag that performance index are better than the seconds of GB/T1596-2005 " flyash in cement and concrete ", product TFe < 2%, the high grade silicate cement of equivalent substitution 20 ~ 30% can be used for the production of commerical ready-mixed concrete, not only can improve concrete performance, reduce concrete production cost, and can whole process clean, thorough improvement electric arc furnace restored slag and flyash are to the destruction of ecotope, turn waste into wealth, save valuable resource.
Claims (6)
1. the complex slag utilizing electric arc furnace restored slag and flyash to produce, is characterized in that component and weight percent thereof are: the electric arc furnace restored slag of 25 ~ 45%, the flyash of 55 ~ 75% and 0.5 ~ 5% admixture.
2. the preparation technology of a kind of complex slag utilizing electric arc furnace restored slag and flyash to produce as claimed in claim 1, it is characterized in that preparation process is: with electric arc furnace restored slag and flyash for raw material, first to water content about 8% electric arc furnace restored slag carry out fragmentation, oven dry, sieve classification and dry type magnetic separation, reducing slag is crushed to below 20mm, moisture drying is reduced to < 2% to < 3%, TFe; Carry out size classification by going out grind materials and together feeding in powder separating machine by the flyash that technique proportioning is measured again, fine powder is specific surface area and is greater than 420m
2/ kg, 45 μm of square hole sieves tail over the complex slag of < 5%, and meal adds the admixture accounting for complex slag unit-hour output 0.5 ~ 5% and carries out closed-circuit grinding in return tube grinding machine again after dry type magnetic separation.
3. the preparation technology of the complex slag utilizing electric arc furnace restored slag and flyash to produce as claimed in claim 2, it is characterized in that: described flyash can with cinder Some substitute or completely alternative, need when taking cinder as raw material first reduction ground-slag and cinder together to be fed in tuber grinder after metering and carry out closed-circuit grinding, if when raw material does not contain cinder, direct electric arc furnace restored slag is carried out fragmentation, oven dry, sieve classification and dry type magnetic separation after and together to feed in powder separating machine by the flyash that technique proportioning is measured and carry out size classification.
4. the preparation technology of the complex slag utilizing electric arc furnace restored slag and flyash to produce as claimed in claim 2, it is characterized in that: described electric arc furnace restored slag and cinder are transported in the material storage yard that complex slag production line specifies from EAF steelmaking plant and heat power plant respectively by wagon tremie, and flyash is then transported in the ad hoc flyash bin of complex slag production line by bulk cement tanker.
5. the preparation technology of the complex slag utilizing electric arc furnace restored slag and flyash to produce as claimed in claim 4, is characterized in that: be provided with in described material storage yard rain-proof shelter for stacking reducing slag and for stack cinder rain-proof dust-proof between.
6. the preparation technology of the complex slag utilizing electric arc furnace restored slag and flyash to produce as claimed in claim 2, is characterized in that: described admixture is for can effectively excite Al in flyash
2o
32SiO
2the alkaline matter of lateral reactivity, as admixture commonly used by the concrete such as dihydrate gypsum, industrially desulfurized gypsum, sodium sulfate, Sodium Nitrite, trolamine.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106277882A (en) * | 2016-08-09 | 2017-01-04 | 魏元聪 | A kind of production technology of New Regenerated environmental protection breeze flyash |
| CN106800381A (en) * | 2017-01-11 | 2017-06-06 | 沧州临港金隅水泥有限公司 | A kind of concrete combined addition material |
| CN107572852A (en) * | 2017-11-07 | 2018-01-12 | 广东韶钢嘉羊新型材料有限公司 | A kind of production method of high-performance ground granulated blast furnace slag |
| CN110128041A (en) * | 2019-05-21 | 2019-08-16 | 四川富敏建材有限公司 | A kind of efficient mountain flour produces the process of flyash |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN106800381A (en) * | 2017-01-11 | 2017-06-06 | 沧州临港金隅水泥有限公司 | A kind of concrete combined addition material |
| CN107572852A (en) * | 2017-11-07 | 2018-01-12 | 广东韶钢嘉羊新型材料有限公司 | A kind of production method of high-performance ground granulated blast furnace slag |
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Application publication date: 20160106 |