CN101555531B - Method for activating and modifying steel slag by residual heat of converter steel slag - Google Patents
Method for activating and modifying steel slag by residual heat of converter steel slag Download PDFInfo
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- CN101555531B CN101555531B CN2009100396046A CN200910039604A CN101555531B CN 101555531 B CN101555531 B CN 101555531B CN 2009100396046 A CN2009100396046 A CN 2009100396046A CN 200910039604 A CN200910039604 A CN 200910039604A CN 101555531 B CN101555531 B CN 101555531B
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- China
- Prior art keywords
- slag
- steel slag
- performance adjustment
- adjustment material
- adjusting material
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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
Abstract
The invention relates to a method for activating and modifying steel slag by the residual heat of converter steel slag, comprising the following steps: mixing and granulizing the performance adjusting material electric furnace reducing slag, coal slag and auxiliary material by weight parts; placing the dried performance adjusting material in a steel slag pack or conveying the same into the steel slag pack by a screw conveyer before the steel slag is discharged; mixing the performance adjusting material with the steel slag by using the impact force of the smelt steel slag dumpage; hot smoldering the mixed performance adjusting material and the steel slag in the slag pack for 8-24 hours; crushing the reconstructed steel slag by a jaw crusher followed by magnetic separating; and finally grinding until the specific surface area achieving 400-500m<2>/kg to obtain the active steel slag micro powder. In the invention, the performance adjusting material is placed in the steel slag pack to be mixed with the smelt steel slag, and the performance adjusting material and the steel slag are reacted at a high temperature by using the residual heat of the smelt steel slag to improve the hydratation and cohesive activity of the converter steel slag.
Description
Technical field
The present invention relates to the technical field of utilizing of bessemer furnace slag, specifically utilize the waste heat of bessemer furnace slag slag to be carried out the method for activation modification.
Background technology
Slag is generally about 20% of crude steel output as the waste residue in when steel-making.In recent years, along with the fast development of China's Iron And Steel Industry, the accumulating amount of slag increases year by year, has not only taken a large amount of soils, has also caused the serious environmental pollution.The mineral composition of bessemer furnace slag is mainly tricalcium silicate, Dicalcium Phosphate (Feed Grade), calcium ferrite, ferric oxide, free ca and RO and equates, wherein silicate minerals is the gelation activity mineral, therefore, slag possesses at aspects such as being used as cement mixture or concrete admixture and has the good potentiality of utilizing.But, because the ore deposit in the slag exists mutually: (1) C
3Solid solution has iron, sulphur etc. among the S; (2) C
2Solid solution has phosphorus and portion C among the S
2S is with SA γ-C
2The S form exists; (3) the low and characteristics such as (4) crystal grain is thick, compact structure of aluminium content in the ferro-aluminate, cause aquation and gelation activity poor, simultaneously, because the problems such as stability difference due to f-CaO, the periclasite (MgO) have seriously restricted slag as the extensive utilization of complementary gelling material in cement, concrete industry.At present, slag is only about 10% in the utilization ratio of cement concrete industry, and it mainly utilizes mode is as road-making material, backfill etc., a kind of low value-added pattern of utilizing of can only saying so.Therefore, developing new technology or research and development new equipment, improve the gelation activity of slag, both can alleviate cement, the insufficient pressure of the complementary gelling material of concrete industry to a certain extent and reduce cement, concrete production cost, can be steel mill again and alleviate environmental stress and produce economic benefit.
Just improve the materialization and the gelling property of slag, lot of domestic and foreign scholar has carried out extensive work, and the slag activation is main flow Journal of Sex Research work up to now, is mainly:
Mechanical force activating, by grinding, steel slag particle diminishes, the specific surface area increase, the part in the grinding energy is converted into energy and surface energy in the newborn particulate, and particle surface forms amorphous structure soluble in water simultaneously, thereby the active raising of slag.The normal grade of Zhen Guang mixed 30～50% ground steel slag in cement, prepared 52.5 composite Portland cements.But the slag grindability is poor, grinding energy consumption height, and also also limited by the raising of its gelation activity of this method.
Autoclave curing by autoclave curing, can promote inertia or low activity mineral generation hydro-thermal reactions such as silicate minerals, forsterite, melilith.Yasumasa Fukashima proposes, and presses to steam and has quickened the aquation of slag and slag compound, can prepare and ask the shellfish mullite content to reach different kinds of roads plastics products for building more than 20%; Money light people, Xu Guangliang etc. press the steaming means to quicken the hydration rate of low basicity slag by adopting, and have prepared and have steamed the above quartz sand peridotites class slag gelling material of pressure degree 50MPa.
Chemi-excitation, chemi-excitation are the hydration and hardenings that slag is quickened in the effect (generally being the admixture chemical admixture) by chemistry.Exciting agent commonly used is gypsum, grog, lime and alkali-metal silicate, carbonate oxyhydroxide etc.Lin Zongshou etc. are with Na
2SiO
4+ Na
2CO
3Activation treatment slag, flyash, but reach 35% o'clock stably manufactured 42.5 early-strength type cement at volume.
Above activated measure all belongs to " rear end " treatment technology, it is traditional method, mainly be based upon utilize in the slag contained effectively or on the potential bonding component basis, but because the congenital deficiency of slag aspect active, the space of improved performance is little, and every kind of method also all exists certain limitation, also do not possess universality, and the large-scale application of slag in cement, concrete industry had little significance.
Summary of the invention
The objective of the invention is to overcome the prior art above shortcomings, provide the waste heat that utilizes bessemer furnace slag slag to be carried out the method for activation modification.This method makes full use of the waste heat of bessemer furnace slag, improves the aquation and the gelling property of bessemer furnace slag, not only can protect environment, economize on resources, and saves cement consumption, reduces CO
2Discharging also is effective comprehensive utilization of slag simultaneously, and new approach is provided.The present invention is achieved through the following technical solutions:
The present invention renders to performance adjustment material in the slag bag, and the surging force of utilizing molten steel slag to topple over is mixed performance adjustment material and slag, utilizes the waste heat of slag to make the two that chemical reconstruct reaction take place, and improves the activity of bessemer furnace slag.Concrete technical scheme is as follows:
Utilize the waste heat of bessemer furnace slag slag to be carried out the method for activation modification, this method is poured onto the molten steel slag in the steel-making converter in the slag bag that performance adjustment material is housed, toppling over the surging force of generation mixes performance adjustment material and molten steel slag, performance adjustment material and molten steel slag issue biochemical reconstruct reaction in the effect of the waste heat of molten steel slag, and the activity of slag is improved; Described performance adjustment material is mixed and made into by weight by following component:
Electric arc furnace restored slag 50～95
Cinder 0～50
Subsidiary material 0～5.
The above-mentioned waste heat of bessemer furnace slag that utilizes carries out slag in the method for activation modification, and the main chemical constitution weight percent of described electric arc furnace restored slag is: SiO
210～25%, FeO0.1～2%, Al
2O
31～6%, CaO45～65%, MgO5～10%.
The above-mentioned waste heat of bessemer furnace slag that utilizes carries out slag in the method for activation modification, and the main chemical constitution weight percent of described cinder is: SiO
255～65%, Fe
2O
31～6%, Al
2O
316～23%, CaO1～3%, MgO0～3%.
The above-mentioned waste heat of bessemer furnace slag that utilizes carries out slag in the method for activation modification, and described subsidiary material main ingredient is starch based polymers or polyvinyl alcohol polymer.
The above-mentioned waste heat of bessemer furnace slag that utilizes carries out slag in the method for activation modification, and described starch based polymers is protect plasticity starch, thickening property starch, protect and mould in the thickening starch one or more.
The above-mentioned waste heat of bessemer furnace slag that utilizes carries out in the method for activation modification to slag, performance adjustment material is through after the granulation, be placed in the slag bag again or utilize worm conveyor to be transported in the slag bag, wherein the add-on of performance adjustment material is 10%～30% of a slag weight.
The above-mentioned waste heat of bessemer furnace slag that utilizes carries out slag in the method for activation modification, and performance adjustment material and slag mix back vexed 8～24 hours of heat in the slag bag.
The above-mentioned waste heat of bessemer furnace slag that utilizes carries out in the method for activation modification to slag, slag and performance adjustment material generation chemical reaction under the waste heat effect of slag, the weight percent content of free calcium oxide is less than 2% in the slag of reaction back, specific surface area 400～500m
2/ kg, the 28d activity index is greater than 85%.
The present invention renders to performance adjustment material in the slag bag and mixes with molten steel slag, utilizes the waste heat of molten steel slag to make both that chemical reaction at high temperature take place, and improves the aquation and the gelation activity of bessemer furnace slag.The present invention has following advantage with respect to prior art:
1, carry out chemically active regulation and control from the source of slag, overcome the later stage owing to slag composition fluctuation causes the shortcoming that activity difference is big, guarantee the gelling property of slag, advance the large-scale application of slag in gelling material.
2, utilize electric arc furnace restored slag and cinder as main property regulation component,, overcome and singly mixed the lower shortcoming of steel-making slag powder early strength, simultaneously trade wastes such as electric arc furnace restored slag, cinder are carried out resource reutilization without any need for exciting agent.
3, avoid discharging the Direct Loss of slag heat, realize the utilization again of slag waste heat.
Embodiment
Below in conjunction with embodiment concrete enforcement of the present invention is described further.The chemical constitution of the slag that relates among the embodiment 1～4, electric arc furnace restored slag, cinder such as table 1 (weight percent %):
Table 1
Embodiment 1:
The bessemer furnace slag bed drain purge is 3 tons, and performance adjustment material is 10% of a slag weight.
Electric arc furnace restored slag, cinder, admixture are mixed by following parts by weight, and processability is regulated material:
70 parts of electric arc furnace restored slags (210 kilograms)
25 parts of cinders (75 kilograms)
5 parts of protect plasticity starch (15 kilograms)
After the performance adjustment material granulation, be placed in the slag bag.
The surging force of utilizing molten steel slag to topple over is mixed performance adjustment material and slag.
With blended performance adjustment material and slag vexed 8 hours of heat in cinder ladle.
Slag and performance adjustment material generation chemical reaction under the waste heat effect of molten steel slag.
Embodiment 2:
The bessemer furnace slag bed drain purge is 3 tons, and performance adjustment material is 15% of a slag weight.
Electric arc furnace restored slag, cinder, admixture are mixed by following parts by weight, and processability is regulated material:
80 parts of electric arc furnace restored slags (360 kilograms)
17 parts of cinders (76.5 kilograms)
3 parts of thickening property starch (13.5 kilograms)
After the performance adjustment material granulation, be placed in the slag bag.
The surging force of utilizing molten steel slag to topple over is mixed performance adjustment material and slag.
With blended performance adjustment material and slag vexed 12 hours of heat in cinder ladle.
Slag and performance adjustment material generation chemical reaction under the waste heat effect of molten steel slag.
Embodiment 3:
The bessemer furnace slag bed drain purge is 3 tons, and performance adjustment material is 20% of a slag weight.
Electric arc furnace restored slag, cinder, admixture are mixed by following parts by weight, and processability is regulated material:
90 parts of electric arc furnace restored slags (540 kilograms)
7 parts of cinders (42 kilograms)
The guarantor moulds 3 parts of thickening starch (18 kilograms)
After the performance adjustment material granulation, utilize worm conveyor to be transported in the slag bag.
The surging force of utilizing molten steel slag to topple over is mixed performance adjustment material and slag.
With blended performance adjustment material and slag vexed 18 hours of heat in cinder ladle.
Molten steel slag the waste heat effect under slag and performance adjustment material generation chemical reaction.
Embodiment 4:
The bessemer furnace slag bed drain purge is 3 tons, and performance adjustment material is 30% of a slag weight.
Electric arc furnace restored slag, cinder, admixture are mixed by following parts by weight, and processability is regulated material:
50 parts of electric arc furnace restored slags (450 kilograms)
49.5 parts of cinders (445.5 kilograms)
0.5 part of polyvinyl alcohol (4.5 kilograms)
After the performance adjustment material granulation, utilize worm conveyor to be transported in the slag bag.
The surging force of utilizing molten steel slag to topple over is mixed performance adjustment material and slag.
With blended performance adjustment material and slag vexed 24 hours of heat in cinder ladle.
Molten steel slag the waste heat effect under slag and performance adjustment material generation chemical reaction.
Reconstruct slag to embodiment 1～4 adopts jaw crusher to carry out fragmentation, and the reconstruct slag is carried out magnetic separation separate; The specific surface area of last grinding is respectively 421m
2/ kg, 426m
2/ kg, 432m
2/ kg, 419m
2/ kg.Be reconstructed the performance test of slag fine powder with reference to standard GB/T20491-2006 " steel-making slag powder that is used for cement and concrete ".The physicals such as the table 2 of the slag fine powder of above-mentioned four embodiment.
Table 2
Table 2 presentation of results: the reconstruct steel-making slag powder is mixed in the cement, volume be 30% o'clock 28d activity index of cement weight all greater than 85%, and 28 days ultimate compression strength of example 3 surpass the intensity of reference cement.As seen, this method is utilized performance adjustment material, at high temperature with slag chemical reconstruct reaction takes place, and carries out the regulation and control of slag gelation activity from the source, overcomes in the later stage to cause the shortcoming that activity difference is big owing to the slag composition fluctuates, and guarantees the gelling property of slag.Realized the renewable resources utilization of trade wastes such as bessemer furnace slag, electric arc furnace restored slag, cinder.The waste heat that utilizes bessemer furnace slag carries out the method for activation modification to slag, realizes the utilization again of slag waste heat, and energy-saving and emission-reduction are for effective comprehensive utilization of slag provides new approach.
Claims (5)
1. utilize the waste heat of bessemer furnace slag slag to be carried out the method for activation modification, it is characterized in that the molten steel slag in the steel-making converter is poured onto in the slag bag that performance adjustment material is housed, toppling over the surging force of generation mixes performance adjustment material and molten steel slag, performance adjustment material and slag mix back vexed 8～24 hours of heat in the slag bag, performance adjustment material and molten steel slag issue biochemical reconstruct reaction in the effect of the waste heat of molten steel slag, and the activity of slag is improved; The add-on of performance adjustment material is 10%～30% of a slag weight, and described performance adjustment material is mixed and made into by weight by following component:
Electric arc furnace restored slag 50～95
Cinder 7～50
Subsidiary material 0～5;
The main chemical constitution weight percent of described electric arc furnace restored slag is: SiO
210～25%, FeO 0.1～2%, Al
2O
31～6%, CaO45～65%, MgO5～10%; The main chemical constitution weight percent of described cinder is: SiO
255～65%, Fe
2O
31～6%, Al
2O
316～23%, CaO1～3%, MgO0～3%.
2. method according to claim 1 is characterized in that described subsidiary material main ingredient is starch based polymers or polyvinyl alcohol polymer.
3. method according to claim 2 is characterized in that described starch based polymers is more than one in protect plasticity starch, the thickening property starch.
4. method according to claim 1 is characterized in that performance adjustment material through after the granulation, is placed in the slag bag again or utilizes worm conveyor to be transported in the slag bag.
5. according to each described method of claim 1～4, it is characterized in that slag and performance adjustment material generation chemical reaction under the waste heat effect of slag, in the slag of reaction back the weight percent content of free calcium oxide less than 2%, specific surface area 400～500m
2/ kg, the 28d activity index is greater than 85%.
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|---|---|---|---|
| CN2009100396046A CN101555531B (en) | 2009-05-19 | 2009-05-19 | Method for activating and modifying steel slag by residual heat of converter steel slag |
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|---|---|---|---|
| CN2009100396046A CN101555531B (en) | 2009-05-19 | 2009-05-19 | Method for activating and modifying steel slag by residual heat of converter steel slag |
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| CN101555531A CN101555531A (en) | 2009-10-14 |
| CN101555531B true CN101555531B (en) | 2011-04-27 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101792274A (en) * | 2010-03-19 | 2010-08-04 | 华南理工大学 | Calcium-silicon-aluminum property regulating material for carrying out on-line high-temperature reconstruction on medium-alkalinity steel slag and application thereof |
| CN101928793B (en) * | 2010-07-22 | 2012-01-11 | 新兴铸管股份有限公司 | Steel slag treatment method |
| CN102531419B (en) * | 2012-01-04 | 2013-03-06 | 浙江大学宁波理工学院 | Steel slag activation method |
| CN102851427A (en) * | 2012-09-10 | 2013-01-02 | 杨龙 | Method for online production of sponge iron by using steel residue waste heat |
| CN103864327B (en) * | 2014-03-31 | 2016-01-20 | 江苏融达新材料股份有限公司 | A kind of preparation method activating comminuted steel shot |
| CN104860554B (en) * | 2015-05-08 | 2016-09-21 | 东南大学 | The composite base material of slag room temperature reconstruct preparation foundation stabilization |
| CN107119155B (en) * | 2017-06-19 | 2022-07-01 | 中冶节能环保有限责任公司 | Molten steel slag rolling modification treatment device and method |
| CN111763787B (en) * | 2020-07-03 | 2022-04-29 | 北京金熔节能环保科技有限公司 | System and method for reducing metal oxide by using high-temperature molten slag and regulating and controlling slag temperature |
| CN111960804A (en) * | 2020-08-24 | 2020-11-20 | 北京光明橡塑制品厂 | Method for manufacturing high-strength sintered building material by using molten steel slag |
| CN112374776B (en) * | 2020-11-10 | 2021-12-28 | 福建富润建材科技股份有限公司 | Steel slag hardening and tempering agent and use method thereof |
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| CN101033117A (en) * | 2006-03-09 | 2007-09-12 | 宝山钢铁股份有限公司 | Steel slag treatment additive |
| CN101397595A (en) * | 2007-09-28 | 2009-04-01 | 中国京冶工程技术有限公司 | Hot disintegration method for molten steel slag |
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