CN103265189B - Method for improving stability of steel slag and maintaining high gelation activity - Google Patents

Method for improving stability of steel slag and maintaining high gelation activity Download PDF

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Publication number
CN103265189B
CN103265189B CN201310213810.0A CN201310213810A CN103265189B CN 103265189 B CN103265189 B CN 103265189B CN 201310213810 A CN201310213810 A CN 201310213810A CN 103265189 B CN103265189 B CN 103265189B
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steel
slag
parts
agent
steel slag
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CN103265189A (en
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赵风清
张志国
郭斌
刘少杰
刘洪杰
李兰兰
李鹏冠
曹素改
梁雪松
李配欣
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Hebei University of Science and Technology
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Hebei University of Science and Technology
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Abstract

The invention relates to a method for improving stability of steel slag and maintaining high gelation activity. The method adopts a digestion agent and a dispersing agent to treat and modify steel slag powder at 50-60 DEG C. the method can be used for improving the stability of the steel slag, maintaining the high gelation activity, increasing the dosage of the steel slag in cement, and lowering the production cost.

Description

A kind of method improved steel slag stability, keep high gelation activity
Technical field
The present invention relates to a kind of method improved steel slag stability, keep high gelation activity, be specially and utilize digestion agent, dispersion agent, pass through wet heat treatment, while improving steel slag stability, keep good cementing property, solve the problem that slag gelling property that bad and other modified techniques of stability that untreated slag causes because of volumetric expansion in cement may cause is lost, realize the high-qualityization utilization of slag.
Background technology
Slag is the waste residue produced in steelmaking process, and generate temperature high (about 1600 DEG C), its ore deposit phase composite is similar to cement clinker, is a kind of material with greater activity.Within 2012, China's slag year quantum of output reaches more than 100,000,000 ton.Domestic iron and steel enterprise, scientific research institution and building materials enterprise, through years of researches, achieve certain progress in steel slag utilization, and slag is successfully applied to the fields such as building materials, road engineering, agriculture production, furnace refractory and sewage disposal.But China's slag comprehensive utilization rate is still lower, is only about 10%, mainly by treatment process and the equipment restriction of slag, causes content of free calcium oxide in steel slag too high, cause application product volume stability bad, do not reach the requirement of Application Areas.At present, slag still to stack, takies a large amount of soil, causes certain influence to ecotope.Therefore, the pretreatment process of slag is particularly important, has considerable influence to the large-scale application of slag.Slag mainly carries out pre-treatment two stages: i.e. output stage (steel mill) of slag and the application stage (slag supply enterprise or production of construction materials enterprise).The main methods in slag output stage has hot application method, water-spraying control, slag stewing method and wheeled water quenching; The treatment process of application stage mainly contains nature and stacks method, mechanical grinding method, steam curing method etc.Simply add water treatment, the free calcium oxide in slag and magnesium oxide can not be made fully to be hydrolyzed, must process intensification be carried out.
The present invention in conjunction with the feature of slag, by levigate, add digestion agent and dispersion agent, and control temperature, keep humidity, oxidation calcium and magnesian hydration process.Meanwhile, the control treatment time, guarantee to make it the least possible generation calcium carbonate, realize in application stage solution steel slag stability, the treatment process keeping high gelation activity.
Summary of the invention
Pin the problems referred to above of the present invention, provide a kind of and improve steel slag stability, keep the method for high gelation activity.Add digestion agent under utilizing wet heat condition, dispersion agent carry out pre-treatment to ground steel slag, improve its stability, improve slag cement products in consumption.
The technical solution adopted in the present invention is: a kind of method improved steel slag stability, keep high gelation activity, adopts following weight fraction than component: steel-making slag powder 92 ~ 100 parts, digestion agent 5 ~ 8 parts, dispersion agent 0.2 ~ 0.6 part, water 9 ~ 14.Concrete method of modifying is: stir add digestion agent, dispersion agent and water in steel-making slag powder after, maintains mixed material modification 48 ~ 72 hours under 50 ~ 60 DEG C of conditions.
Described steel-making slag powder obtains through broken, dry, grinding by making steel shrend slag, and specific surface area is 350 ~ 430m 2/ kg, free calcium oxide content is 1.5 ~ 6%, and free magnesium content is 0.5 ~ 3%.
Described digestion agent by weight fraction be the calcium oxide of 6 ~ 8 parts, the silicon ash of the non-hydrate sodium metasilicate of 1 ~ 2 part and 0.5 ~ 1 part forms, and is uniform powdery mixture.
Described dispersion permeate agent is one or both in sulfonated melamine compound resin and sodium methylene bis-naphthalene sulfonate.
Beneficial effect of the present invention is: by carrying out pre-treatment to slag, improving its stability, improving the consumption in cement, reduces production cost.
Embodiment
Embodiment one: make 42.5 grade composite Portland cements.
(1) pretreatment of slag digestion agent weight consists of 6.5 parts of calcium oxide, 1.8 parts of non-hydrate sodium metasilicates, 1 part of silicon ash.Concrete method of modifying is: stir add the water of 5 parts of digestion agents, 0.3 part of sulfonated melamine compound resin and 11 parts in 92 parts of steel-making slag powder after, maintains mixed material modification 50 hours under 50 ~ 55 DEG C of conditions.
(2) cement proportion and salient features Portland clinker 41.5%, slag powders 10%, modified steel ground-slag 45%, desulfurated plaster 3.5%.
* note: adopt GBT1346-2001, sample is defeated and dispersed.
Embodiment two: make 32.5 grade composite Portland cements.
(1) pretreatment of slag digestion agent weight consists of 8 parts of calcium oxide, 1 part of non-hydrate sodium metasilicate, 0.5 part of silicon ash.Concrete method of modifying is: stir add 8 parts of digestion agents, 0.2 part of sulfonated melamine compound resin, 0.2 part of sodium methylene bis-naphthalene sulfonate, 13 parts of water in 100 parts of steel-making slag powder after, maintains mixed material modification 65 hours under 55 ~ 60 DEG C of conditions.
(2) cement proportion and salient features Portland clinker 36.5%, flyash 15%, modified steel ground-slag 50%, desulfurated plaster 3.5%.
* note: adopt GBT1346-2001, severe crack appears in sample.

Claims (2)

1. improve steel slag stability, keep a method for high gelation activity, it is characterized in that: adopt following weight fraction than component: steel-making slag powder 92 ~ 100 parts, digestion agent 5 ~ 8 parts, dispersion agent 0.2 ~ 0.6 part, 9 ~ 14 parts, water; Described digestion agent, by weight fraction be the calcium oxide of 6 ~ 8 parts, the silicon ash of the non-hydrate sodium metasilicate of 1 ~ 2 part and 0.5 ~ 1 part forms, and is uniform powdery mixture; Described dispersion agent is one or both in sulfonated melamine compound resin and sodium methylene bis-naphthalene sulfonate; Concrete grammar is: stir add digestion agent, dispersion agent and water in steel-making slag powder after, maintains mixed material modification 48 ~ 72 hours under 50 ~ 60 DEG C of conditions.
2. method according to claim 1, is characterized in that: steel-making slag powder is wherein obtained by slag grinding after crushing-magnetic selection, and specific surface area is 350 ~ 430m 2/ kg, free calcium oxide content is 1.5 ~ 6%, and free magnesium content is 0.5 ~ 3%.
CN201310213810.0A 2013-06-03 2013-06-03 Method for improving stability of steel slag and maintaining high gelation activity Active CN103265189B (en)

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CN103524058B (en) * 2013-10-10 2015-09-02 河北科技大学 A kind of steel slag stability treatment process
CN103539417B (en) * 2013-10-10 2015-06-24 遵化市中环固体废弃物综合利用有限公司 Method for manufacturing steam-pressing bricks by using iron tailings and steel slag
CN105271865A (en) * 2014-06-05 2016-01-27 镇江市船山第二水泥厂 Cement modifier component and preparation method thereof
CN105885587A (en) * 2016-06-22 2016-08-24 杨玉双 Anti-freezing waterproof coating and preparation method thereof
CN115043626A (en) * 2022-06-24 2022-09-13 华新水泥股份有限公司 Ordinary silicate-based inorganic wear-resistant coating and preparation method thereof
CN115073080B (en) * 2022-08-22 2022-12-13 平泉市岩石建筑材料有限公司 Solid waste base concrete and preparation method thereof

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ES2297334T3 (en) * 2004-02-05 2008-05-01 Optos Optimale Oszillationstechnik Gmbh METHOD FOR PREPARING A CONSTRUCTION MATERIAL.
CN101328517A (en) * 2008-07-25 2008-12-24 武汉钢铁(集团)公司 Steel slag stability modifier and steel slag stability processing method
CN102732652A (en) * 2011-04-13 2012-10-17 许兴康 Superfine grinding method for steel slag slurry
CN102503193B (en) * 2011-10-24 2013-01-23 西安建筑科技大学 Process method for preparing similar cement clinkers by treating steel slag at thermal state in way of heat preservation
CN102875038B (en) * 2012-10-22 2013-11-13 辽宁科技大学 Method for removing free calcium oxide and magnesium oxide in converter steel making slag

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