CN102731003A - Method for producing S95-grade slag micro-powder by using low-activity acidic slag - Google Patents
Method for producing S95-grade slag micro-powder by using low-activity acidic slag Download PDFInfo
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- CN102731003A CN102731003A CN2012102193118A CN201210219311A CN102731003A CN 102731003 A CN102731003 A CN 102731003A CN 2012102193118 A CN2012102193118 A CN 2012102193118A CN 201210219311 A CN201210219311 A CN 201210219311A CN 102731003 A CN102731003 A CN 102731003A
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- slag
- powder
- low activity
- micropowder
- activity
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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 invention provides a method for producing S95-grade slag micro-powder by using low-activity acidic slag. The method comprises the following steps: grinding low-activity acidic slag and sulfate dihydrate in a vertical mill so as to obtain slag powder with a specific surface area of 450 to 480 m<2>/kg; grinding Portland cement clinker to obtain powder with a specific surface area of 340 to370 m<2>/kg; and uniformly mixing the slag powder and the powder and standing an obtained mixture for homogenization so as to obtain the S95-grade slag micro-powder. The method provided in the invention can produce the S95-grade slag micro-powder by using low-activity acidic slag, which enables the problem of utilization of low-activity slag to be overcome and production cost to be reduced.
Description
Technical field
The invention belongs to base mateiral manufacturing technology field, relate to a kind of working method of S95 level breeze, be specifically related to the method that a kind of low activity acid slag is produced S95 level breeze.
Background technology
Cement consumption in slag micropowder equivalent substitution various uses concrete and the cement products can obviously improve the over-all properties of concrete and cement products.Slag micropowder mixes with silicate cement, and its volume can reach 50%～65%, has reduced the addition content of grog.Slag micropowder directly mixes concrete as admixture, can significantly improve concrete hydration heat and improve the performance such as flowability, workability, pumpability of concrete construction; Improve concrete impervious, freeze proof, sulfate resistance, resisting chloride ion penetration erosion performance; Increase concrete compaction degree and structural strength; Suppress concrete alkali, improve concrete weather resistance; Improve the erosional competency of the anti-seawater of concrete; Significantly reduce the concrete manufacturing cost, obtain good economic benefit.National standard is divided into three grades of S75, S95 and S105 with slag micropowder.At present, the concrete works of most of large-scale construction engineerings, concrete mixing plant, newly-built high-speed railway has no longer only satisfied the S75 level to the specification of quality of slag micropowder, but requires to reach the standard of S95 level or S105 level.
The slag micropowder that uses in the construction work is to be ground by the slag that blast furnace ironmaking produces to form.Slag is divided into acid slag and alkaline slag, and the activity of alkaline slag is better than acid slag.Acid slag is divided into high reactivity acid slag and low activity acid slag again.Usually produce slag micropowder with active good alkaline slag and high reactivity acid slag; And the low activity acid slag can only be used for producing the slag micropowder of S75 level, even add the slag micropowder that exciting agent can not be produced S95 level or S105 level with the low activity acid slag.
Summary of the invention
In order to overcome the problem that exists in the above-mentioned prior art; The purpose of this invention is to provide a kind of method of producing S95 level slag micropowder with the low activity acid slag; Can produce S95 level slag micropowder by enough low activity acid slags, solve the problem that exists in the prior art.
For realizing above-mentioned purpose, the technical scheme that the present invention adopted is: a kind of method of producing S95 level slag micropowder with the low activity acid slag, specifically carry out according to the following steps:
Step 1: place Vertical Mill to grind low activity acid slag and sulfate dihydrate salt, obtaining specific surface area is 450m
2/ Kg～480m
2/ Kg slag powders, the quality of used sulfate dihydrate salt are 5%～10% of low activity acid slag quality;
Portland clinker is ground into specific area 340m
2/ Kg～370m
2The powder of/Kg;
Step 2: by mass percentage, get the powder that slag powders that 97%～94% step 1 makes and 3%～6% step 1 make respectively, in mixer, mix, place homogenizing then, make S95 level slag micropowder.
SO in said step 1 slag powders
3Content be 3.7～3.9%.
Said sulfate dihydrate salt adopts dihydrate gypsum or desulfurated plaster.
Working method of the present invention is united in slag powders and is added a certain amount of alkali-activator (dihydrate gypsum and Portland clinker); By its physical-chemical reaction; Induce and quicken the hydration reaction speed of slag powders, reach the acid powder of low activity and improve active purpose, produce S95 level slag micropowder with the low activity acid slag; Solve the scoriaceous multi-faceted application problem of low activity, reduced production cost.
Embodiment
Below in conjunction with embodiment the present invention is elaborated.
GBFS is the material of " latent hydraulicity ", separately and during the water mix, reacts extremely slow, can not get enough intensity; And in saturated basic soln, the slag glass surface is destructurized, and moisture is easy to infiltrate and carry out hydration reaction, makes slag particle disperse to disintegrate, and generates hydrated calcium silicate and drated calcium aluminate that gelling is arranged, improves scoriaceous intensity.Corresponding low activity acid slag when producing slag micropowder with it, mixes alkali-activators such as white lime, gypsum, cement clinker or alkali metal cpd respectively separately, makes specific area>=500m
2/ Kg just can make scoriaceous latent hydraulicity obtain performance to a certain degree.But the method for existing production slag micropowder and the exciting agent of use also are not suitable for low activity acid slag production S95 level slag micropowder, and when producing S75 level slag micropowder with the low activity acid slag, power consumption is higher, and equipment attrition is big.
Because the smelting technology of each Iron And Steel Plant and used starting material are different, make scoriaceous chemical ingredients, activity index also different with quality coefficient, even the bigger difference of existence.Utilize the slag of different mass, the slag powders of the identical specific surface area of grinding, activity index differs greatly.For example the scoriaceous staple and the relation conefficient in wine steel slag and Handan Iron and Steel Co, Baosteel, Qujing, water steel, inland river are seen table 1
Table 1 different areas slag chemical ingredients and relation conefficient comparison sheet
Can find out that from table 1 the slag activeconstituents of Hebei Handan Iron and Steel Co, Guizhou water steel and Baosteel is many, inert fraction is few, is alkaline slag.The slag in Gansu wine steel, inland river, Sichuan, Qujing, Yunnan and Jiangsu, activeconstituents is few, and inert fraction is many, its CaO, MgO, Ai
20
3Content is lower, SiO
2Content is higher, is acid slag.The slag reactivity coefficient of Gansu wine steel belongs on the low side with other factories than all with quality coefficient, and reactivity coefficient is minimum.If do not take measures on customs clearance, the activity index of breeze is difficult to reach the national standard of S95 grade slag powder.Therefore, how to put forward the activity index of slag micropowder, the activity that the performance slag micropowder is maximum reaches the above breeze of S95 level, is our problem anxious to be solved, also is the key problem that satisfies market, improves breeze product competitive power on market.
Scoriaceous main chemical compositions of Gansu wine steel and relation conefficient were seen table 2 in recent years
Scoriaceous chemical ingredients of table 2 Gansu wine steel and correlation coefficient charts
According to scoriaceous chemical analysis results, calculate its quality index.
Reactivity coefficient=Al
2O
3/ SiO
2=10.69/38.06
=0.28; Reactivity coefficient 0.3, belong to active lower slag.
The alkalescence coefficient=(CaO+MgO)/(SiO
2+ Al
2O
3)
=(37.78+7.65)/(38.06+10.69)
=0.93; The alkalescence coefficient 1, belong to acid slag.
Quality coefficient=(CaO+MgO+Al
2O
3)/(SiO
2+ MnO+TiO
2)
=(37.78+7.65+10.69)/(38.06+0.91+1.57)
=1.38
1.2＜quality coefficient＜1.6 do not reach the premium grads index, but have reached salable product (the salable product quality coefficient is greater than 1.20) requirement.
From scoriaceous chemical ingredients and relation conefficient, the slag that this Gansu wine steel company produces belongs to active lower acid slag.
In order to make full use of a large amount of low activity acid slags that produce in the Gansu wine steel company steelmaking process; Alleviate environmental pollution; The invention provides a kind of method of producing S95 level slag micropowder, can effectively consume the low activity acid slag, for the utilization of low activity acid slag provides a kind of valid approach with the low activity acid slag; Reduce environmental pollution, greatly reduced cost simultaneously.This working method is specifically carried out according to the following steps:
Step 1: place Vertical Mill to grind low activity acid slag and sulfate dihydrate salt, obtain slag powders, the quality of used sulfate dihydrate salt is 5～10% of a low activity acid slag quality, and the specific surface area of controlling this slag powders is 450～480 m
2/ Kg controls SO in this slag powders
3Content is 3.7～3.9%;
With Vertical Mill or ball mill Portland clinker is ground into specific area 340～370m
2The powder of/Kg;
Sulfate dihydrate salt adopts dihydrate gypsum or desulfurated plaster.
Step 2: by mass percentage, get the powder that slag powders that 97～94% steps 1 make and 3～6% steps 1 make respectively, in mixer, mix, place homogenizing then, make S95 level slag micropowder.
Through alkali-activator, slag particle diameter when regrind mill reduces, self crystalline structure, chemical constitution, physicochemical property generation machinery and chemical transformation.The rearrangement and the recrystallization of the slag atomic structure that is activated, upper layer is spontaneously recombinated, and forms amorphous structure; Its internal crystal structure generation randomization and the heterogeneous crystal conversion of generation; Make lattice imperfection generation, specific surface area increase, surface energy increase etc.; Scoriaceous thereupon mechanical property, crystallographic properties, physicochemical property etc. all can the variations of pests occurrence rule property, improve but breeze is active.
The volume of gypsum in breeze is 5%～10%, the SO in the breeze
3Be controlled at≤3.90% o'clock, there is the effect of regulating cement and slag hydration rate and excited cement and slag intensity at the aquation initial stage, has played the dual function of vitriol and alkaline excitation simultaneously in slag powders.Cement clinker-slag powders gelling system early strength all has growth, to improving the breeze activity good promoter action is arranged.Separately to rise be not clearly to its early activity index of the slag powders of admixture gypsum, but in the admixture gypsum, add the little cement grog, early activity and later stage activity index that fully can the activated slag powder.
The specific area of cement generally all is controlled at 340～370m when producing cement
2Between/the Kg, for considering actual production, simplify production technique, the chamotte powder that the specific area of this scope is produced on the one hand can direct production cement, and this chamotte powder can be used for doing the exciting agent of breeze again on the other hand.Can cause production cost to increase (specific area is high more good more theoretically) if improve specific area, if reduce the normal performance that the excitation of specific area in breeze slowly is unfavorable for intensity.
In slag powders, unite and add a certain amount of alkali-activator,, induce and quicken the hydration reaction speed of slag powders, reach the acid powder of low activity and improve active purpose by its physical-chemical reaction.
Embodiment 1
Place Vertical Mill to grind low activity acid slag and dihydrate gypsum, obtaining specific surface area is 450 m
2The slag powders of/Kg, SO in this slag powders
3Content be 3.7%; The quality of used dihydrate gypsum is 5% of a low activity acid slag quality; With Vertical Mill Portland clinker is ground into specific area 340m
2The powder of/Kg; By mass percentage, get 97% slag powders and 3% powder respectively, in mixer, mix, place homogenizing then, make slag micropowder.
Through detecting, 7 days activity index of this slag micropowder is 78.1; Activity index was 97.3 in 28 days.That is to say that the inventive method utilizes the technical indicator of the slag micropowder that the low activity acid slag produces to meet the technical indicator of GB/T18046-2008 fully.Explain that the slag micropowder that adopts the inventive method to make is a S95 level slag micropowder.And adopt gypsum, cement clinker to do compound activator in the existing working method; Mainly be that (not mixing 7 days activity indexs of compound activator has only about 60 for 7 days activity indexs improving breeze; Activity index had only about 80 in 28 days, can't reach standard-required 75).And the power consumption that the inventive method is produced under the situation that specific area equates with low activity acid slag production breeze and alkaline slag is suitable.
Embodiment 2
Place Vertical Mill to grind low activity acid slag and dihydrate gypsum, obtaining specific surface area is 455 m
2The slag powders of/Kg, SO in this slag powders
3Content be 3.8%; The quality of used dihydrate gypsum is 6% of a low activity acid slag quality; With Vertical Mill Portland clinker is ground into specific area 345m
2The powder of/Kg; By mass percentage, get 96.5% slag powders and 3.5% powder respectively, in mixer, mix, place homogenizing then, make slag micropowder.7 days activity index of this slag micropowder is 80.5; Activity index was 97.8 in 28 days, met the technical requirements fully, explained that this slag micropowder is a S95 level breeze.
Embodiment 3
Place Vertical Mill to grind low activity acid slag and dihydrate gypsum, obtaining specific surface area is 460 m
2The slag powders of/Kg, SO in this slag powders
3Content be 3.9%; The quality of used dihydrate gypsum is 7% of a low activity acid slag quality; With Vertical Mill Portland clinker is ground into specific area 355m
2The powder of/Kg; By mass percentage, get 96% slag powders and 4% powder respectively, in mixer, mix, place homogenizing then, make slag micropowder.7 days activity indexs of this slag micropowder are 79.3; Activity index was 97.6 in 28 days, met the technical requirements fully, explained that this slag micropowder is a S95 level breeze.
Embodiment 4
Place Vertical Mill to grind low activity acid slag and dihydrate gypsum, obtaining specific surface area is 465 m
2The slag powders of/Kg, SO in this slag powders
3Content be 3.75%; The quality of used dihydrate gypsum is 8% of a low activity acid slag quality; With Vertical Mill Portland clinker is ground into specific area 360m
2The powder of/Kg; By mass percentage, get 95.5% slag powders and 4.5% powder respectively, in mixer, mix, place homogenizing then, make slag micropowder.7 days activity indexs of this slag micropowder are 82.5; Activity index was 100.8 in 28 days, met the technical requirements fully, explained that this slag micropowder is a S95 level breeze.
Embodiment 5
Place Vertical Mill to grind low activity acid slag and dihydrate gypsum, obtaining specific surface area is 470 m
2The slag powders of/Kg, SO in this slag powders
3Content be 3.85%; The quality of used dihydrate gypsum is 9% of a low activity acid slag quality; With Vertical Mill Portland clinker is ground into specific area 365m
2The powder of/Kg; By mass percentage, get 95% slag powders and 5% powder respectively, in mixer, mix, place homogenizing then, make slag micropowder.7 days activity indexs of this slag micropowder are 83.3; Activity index was 99.6 in 28 days, met the technical requirements fully, explained that this slag micropowder is a S95 level breeze.
Embodiment 6
Place Vertical Mill to grind low activity acid slag and dihydrate gypsum, obtaining specific surface area is 480 m
2The slag powders of/Kg, SO in this slag powders
3Content be 3.7%; The quality of used dihydrate gypsum is 10% of a low activity acid slag quality; With Vertical Mill Portland clinker is ground into specific area 370m
2The powder of/Kg; By mass percentage, get 94% slag powders and 6% powder respectively, in mixer, mix, place homogenizing then, make slag micropowder.7 days activity indexs of this slag micropowder are 83.8; Activity index was 101.1 in 28 days, met the technical requirements fully, explained that this slag micropowder is a S95 level breeze.
Claims (3)
1. method of producing S95 level slag micropowder with the low activity acid slag is characterized in that this working method is specifically carried out according to the following steps:
Step 1: place Vertical Mill to grind low activity acid slag and sulfate dihydrate salt, obtaining specific surface area is 450m2/Kg～480m2/Kg slag powders, and the quality of used sulfate dihydrate salt is 5%～10% of a low activity acid slag quality;
Portland clinker is ground into the powder of specific area 340m2/Kg～370m2/Kg;
Step 2: by mass percentage, get the powder that slag powders that 97%～94% step 1 makes and 3%～6% step 1 make respectively, in mixer, mix, place homogenizing then, make S95 level slag micropowder.
2. method of producing S95 level slag micropowder with the low activity acid slag as claimed in claim 1 is characterized in that the content of SO3 is 3.7～3.9% in said step 1 slag powders.
3. method of producing S95 level slag micropowder with the low activity acid slag as claimed in claim 1 is characterized in that said sulfate dihydrate salt adopts dihydrate gypsum or desulfurated plaster.
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Cited By (5)
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| CN104446041A (en) * | 2014-12-03 | 2015-03-25 | 金川集团股份有限公司 | Method for producing superfine slag powder by using copper smelting secondary slag |
| CN104609749A (en) * | 2014-12-24 | 2015-05-13 | 金川集团股份有限公司 | A filling gel material prepared from low-activity acid water-quenched slag |
| CN111250506A (en) * | 2019-09-20 | 2020-06-09 | 内蒙古锐璟永致再生资源有限责任公司 | High-calcium micro powder for detoxifying, reducing and recycling coal cinder |
| CN112358206A (en) * | 2020-11-16 | 2021-02-12 | 山西太钢不锈钢股份有限公司 | Method for improving activity of blast furnace slag micro powder |
| CN113024139A (en) * | 2018-10-31 | 2021-06-25 | 日照钢铁控股集团有限公司 | Process for preparing powder by co-grinding blast furnace granulated slag and citric acid slag |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113024139A (en) * | 2018-10-31 | 2021-06-25 | 日照钢铁控股集团有限公司 | Process for preparing powder by co-grinding blast furnace granulated slag and citric acid slag |
| CN111250506A (en) * | 2019-09-20 | 2020-06-09 | 内蒙古锐璟永致再生资源有限责任公司 | High-calcium micro powder for detoxifying, reducing and recycling coal cinder |
| CN112358206A (en) * | 2020-11-16 | 2021-02-12 | 山西太钢不锈钢股份有限公司 | Method for improving activity of blast furnace slag micro powder |
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Application publication date: 20121017 |