CN101450846A - Composite type slag powder and production method thereof - Google Patents

Composite type slag powder and production method thereof Download PDF

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Publication number
CN101450846A
CN101450846A CNA2007101714371A CN200710171437A CN101450846A CN 101450846 A CN101450846 A CN 101450846A CN A2007101714371 A CNA2007101714371 A CN A2007101714371A CN 200710171437 A CN200710171437 A CN 200710171437A CN 101450846 A CN101450846 A CN 101450846A
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CN
China
Prior art keywords
percent
slag
desulfurated plaster
composite type
slag micropowder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2007101714371A
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Chinese (zh)
Inventor
单卫良
赵玉静
曹黎颖
康明
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Shanghai Baotian New Building Materials Co Ltd
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Shanghai Baotian New Building Materials Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Baotian New Building Materials Co Ltd filed Critical Shanghai Baotian New Building Materials Co Ltd
Priority to CNA2007101714371A priority Critical patent/CN101450846A/en
Publication of CN101450846A publication Critical patent/CN101450846A/en
Pending legal-status Critical Current

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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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  • Processing Of Solid Wastes (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

The invention relates to composite slag micropowder, which takes common slag micropowder as a base material. The composite slag micropowder is characterized in that 1 to 7 weight portions of desulfurated gypsum is doped into every 100 weight portions of the slag micropowder, and the desulfurated gypsum comprises the following chemical compositions by weight percentage: 19.7 percent of crystalline water, 44.73 percent of SO3, 1.68 percent of SiO2, 31.38 percent of CaO, 0.12 percent of MgO, 0.48 percent of Fe2O3 and 0.76 percent of Al2O3. The method for producing the composite slag micropowder comprises: A, drying the desulfurated gypsum and removing free moistures for standby, wherein the moisture content is required to be less than 1 percent, and the SO3 content is required to be more than 40 percent; B, drying blast furnace slag until the moisture content is less than 1 percent; and C, grinding dried slag in a ball mill until the specific surface area reaches 380 m<2>/kg, and adding the desulfurated gypsum into the grinded dried slag according to the proportion of between 1 and 7 percent during grinding.

Description

A kind of composite type slag powder and production method thereof
Technical field
The present invention relates to a kind of high performance concrete Additive, especially a kind of is raw-material a kind of composite type slag powder and production method thereof with the iron-smelting blast furnace slag, belongs to blast-furnace cinder micro-powder manufacturing technology class.
Background technology
Slag micropowder is as the special-purpose Additive of widely accepted high performance concrete, has excellent use properties, be embodied in and improve fresh concrete flowability, water-retentivity, minimizing becomes the crack because of the temperature that aquation causes, concrete after the sclerosis has the performance of good resisting erosion of sulfate, the infiltration of anti-villaumite, anti-marine denudation, anti-carbonization, alkali resistant aggregate reaction, and can improve concrete longterm strength, and have favorable durability and wear resistance.
Slag micropowder is the blast-furnace slag that Steel Plant's ironmaking is produced, and is levigate through oven dry, makes the finished product that reaches certain fineness and promptly can be used as concrete Additive use, generally do not add any other material.The performance situation of market common product is as follows:
Sequence number Project Index
1 Density (g/cm 3) 2.80
2 Specific surface area (m 2/kg) 380
3 3 days activity indexs (%) 50
4 7 days activity indexs (%) 75
5 28 days activity indexs (%) 95
6 Degree of mobilization is than (%) 95
7 SO 3Content (%) 0.20
8 Loss on ignition (%) 0.50
9 MgO content (%) 8.00
But, when simple use slag micropowder uses as the cement concrete Additive, relatively stricter for the requirement of construction technology, churning time is longer slightly than the concrete of not mixing Additive, and to the requirement of the precuring after the moulding also than higher, when using slag micropowder as the cement concrete Additive, the early strength of cement concrete is lower, more easily produces dry shrinkage and cracking, so the general requirement cement concrete surface adds the cloth covering, water seasoning, and curing time should not be less than 14 days.
Summary of the invention
Purpose of the present invention: aim to provide a kind ofly by in the slag micropowder production process, add a kind of material modifiedly, further improve the use properties of blast-furnace cinder micro-powder.
This composite type slag powder is a base-material with the slag micropowder of common public, it is characterized in that: the desulfurated plaster of admixture 1-7 weight part in the slag micropowder of per 100 weight fraction; The chemical composition of this desulfurated plaster is: crystal water 19.7, SO 344.73, SiO 21.68, CaO31.38 MgO 0.12 Fe 2O 30.48 Al 2O 30.76.
The production method of described composite type slag powder:
A, desulfurated plaster oven dry removal free water content is standby requires moisture content less than 1%, SO 3Content is greater than 40%;
B, with blast-furnace slag dry to moisture content less than 1%;
C, will dry slag grinding to specific surface area in ball mill and reach 380m 2/ kg,
Ratio in 1～7% in the grinding process adds desulfurated plaster.
According to above technical scheme this composite type slag powder is proposed, compare with the ordinary slag micro mist of present use, in not only in concrete product, using, has higher early activity exponential sum workability preferably, and the desulfurated plaster that adopts, be the trade waste of coal-fired plant flue gas desulfurization discharging.Therefore generally applying of this technology provides powerful technical support not only can for good production environment of large-scale iron and steel enterprise structure and raising resource and economic benefit, and to improving urban environment and air quality positive effect arranged all.
Embodiment
Below provide embodiments of the invention, and further set forth the present invention.
This composite type slag powder is a base-material with the slag micropowder of common public, it is characterized in that: the desulfurated plaster of admixture 1-7 weight part in the slag micropowder of per 100 weight parts; The chemical composition of this desulfurated plaster (%) is: crystal water 19.7, SO 344.73, SiO 21.68, CaO 31.38 MgO 0.12 Fe 2O 30.48 Al 2O 30.76.
It is standby that free water content is removed in the desulfurated plaster oven dry, requires moisture content less than 1%, SO 3Content is greater than 40%;
1. blast-furnace slag is dried to moisture content less than 1%;
2. will dry slag grinding to specific surface area in ball mill and reach 380m 2/ kg, the amount that grinding process adds desulfurated plaster is controlled at 1～7%.
Described desulfurated plaster is taken from the trade waste of coal-fired plant flue gas desulfurization discharging.
Example 1
Grinding process desulfurated plaster volume is 1% of a blast-furnace slag, and the product performance situation of the slag micropowder Additive of producing with this ratio is as follows:
Sequence number Project Index
1 Density (g/cm 3) 2.90
2 Specific surface area (m 2/kg) 410
3 3 days activity indexs (%) 52
4 7 days activity indexs (%) 78
5 28 days activity indexs (%) 103
6 Degree of mobilization is than (%) 95
7 SO 3Content (%) 0.40
8 Loss on ignition (%) 0.00
9 MgO content (%) 8.00
Example 2
Grinding process desulfurated plaster volume is 4.0% of a blast-furnace slag, and the product performance situation of the slag micropowder Additive of producing with this ratio is as follows:
Sequence number Project Index
1 Density (g/cm 3) 2.90
2 Specific surface area (m 2/kg) 410
3 3 days activity indexs (%) 56
4 7 days activity indexs (%) 80
5 28 days activity indexs (%) 105
6 Degree of mobilization is than (%) 98
7 SO 3Content (%) 1.60
8 Loss on ignition (%) 0.00
9 MgO content (%) 8.00
Example 3
Grinding process desulfurated plaster volume is 7% of a blast-furnace slag, and the product performance situation of the slag micropowder Additive of producing with this ratio is as follows:
Sequence number Project Index
1 Density (g/cm 3) 2.90
2 Specific surface area (m 2/kg) 410
3 3 days activity indexs (%) 65
4 7 days activity indexs (%) 83
5 28 days activity indexs (%) 105
6 Degree of mobilization is than (%) 98
7 SO 3Content (%) 2.90
8 Loss on ignition (%) 0.00
9 MgO content (%) 8.00
After Additive added water and mixes and stirs, the effective constituent in the desulfurated plaster---gypsum was partially soluble in water, formed Ca 2+And SO 4 2-, SO 4 2-Slag micropowder is played excitation, quicken the aquation of slag micropowder, generate aquation calcium sulphoaluminate hydrated products such as (ettringite).The generation of ettringite has improved concrete early strength, has increased concrete compactness, and having reduced the early stage rimose of concrete may.The generation of ettringite also helps the raising of late strength of concrete, simultaneously concrete weather resistance is improved greatly.
From the foregoing description as can be seen: this composite type slag powder that has added the trade waste desulfurated plaster of taking from coal-fired plant flue gas desulfurization discharging, after used as concrete admixture, make concrete related physical performance such as density, specific surface area, all be greatly improved on the parameter indexs such as 3-28 days activity indexs and degree of mobilization ratio, and these indexs are able to a certain amount of raising, for of the further optimization of further raising blast-furnace cinder micro-powder as the construction technology performance of concrete admixture, and the concrete slump of this type, the raising of concrete strength and weather resistance all is very useful.

Claims (3)

1, a kind of composite type slag powder is a base-material with the slag micropowder of common public, it is characterized in that: the desulfurated plaster of admixture 1-7 weight part in the slag micropowder of per 100 weight parts; The chemical composition of this desulfurated plaster (%) is: crystal water 19.7, SO 344.73, SiO 21.68 CaO 31.38, MgO 0.12, Fe 2O 30.48, Al 2O 30.76.
2, the production method of composite type slag powder as claimed in claim 1 is:
A, desulfurated plaster oven dry removal free water content is standby requires moisture content less than 1%, SO 3Content is greater than 40%;
B, with blast-furnace slag dry to moisture content less than 1%;
C, will dry slag grinding to specific surface area in ball mill and reach 380m 2/ kg, the ratio in 1～7% in the grinding process adds desulfurated plaster.
3, a kind of composite type slag powder as claimed in claim 1 is characterized in that: described desulfurated plaster is taken from the trade waste of coal-fired plant flue gas desulfurization discharging.
CNA2007101714371A 2007-11-30 2007-11-30 Composite type slag powder and production method thereof Pending CN101450846A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2007101714371A CN101450846A (en) 2007-11-30 2007-11-30 Composite type slag powder and production method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2007101714371A CN101450846A (en) 2007-11-30 2007-11-30 Composite type slag powder and production method thereof

Publications (1)

Publication Number Publication Date
CN101450846A true CN101450846A (en) 2009-06-10

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102221296A (en) * 2011-05-16 2011-10-19 河北东安集团有限公司 Tailing heating treatment method for medium frequency induction heating furnace
CN102731003A (en) * 2012-06-29 2012-10-17 酒钢(集团)宏达建材有限责任公司 Method for producing S95-grade slag micro-powder by using low-activity acidic slag
CN103086627A (en) * 2013-02-25 2013-05-08 同济大学 Mineral blending material for producing PHC (Pyrolysis Hydrocarbon) tubular pipe free from high pressure steaming process as well as application
CN110255941A (en) * 2019-07-27 2019-09-20 山东莱钢永锋钢铁有限公司 A kind of desulfurized gypsum reuse method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102221296A (en) * 2011-05-16 2011-10-19 河北东安集团有限公司 Tailing heating treatment method for medium frequency induction heating furnace
CN102731003A (en) * 2012-06-29 2012-10-17 酒钢(集团)宏达建材有限责任公司 Method for producing S95-grade slag micro-powder by using low-activity acidic slag
CN103086627A (en) * 2013-02-25 2013-05-08 同济大学 Mineral blending material for producing PHC (Pyrolysis Hydrocarbon) tubular pipe free from high pressure steaming process as well as application
CN110255941A (en) * 2019-07-27 2019-09-20 山东莱钢永锋钢铁有限公司 A kind of desulfurized gypsum reuse method

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Open date: 20090610