JPH07223857A - Forced aging method for slag - Google Patents
Forced aging method for slagInfo
- Publication number
- JPH07223857A JPH07223857A JP26964294A JP26964294A JPH07223857A JP H07223857 A JPH07223857 A JP H07223857A JP 26964294 A JP26964294 A JP 26964294A JP 26964294 A JP26964294 A JP 26964294A JP H07223857 A JPH07223857 A JP H07223857A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- aging
- blast furnace
- steam
- coal ash
- 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.)
- Granted
Links
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Furnace Details (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、製鋼スラグおよび／ま
たは溶銑予備処理スラグを強制エージングする際に、粉
化防止およびエージング促進を目的としたスラグ処理方
法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slag treatment method for preventing pulverization and promoting aging when forcibly aging steelmaking slag and / or hot metal pretreatment slag.
【０００２】[0002]
【従来の技術】一般に製鋼スラグおよび／または溶銑予
備処理スラグ（以下でスラグと称す）は、スラグ中に石
灰が遊離した形（以下で遊離ＣａＯと称す）で残存して
いるため、そのままの形で道路材、土木用材に利用した
場合、遊離ＣａＯの水酸化、炭酸化により膨張すること
が知られている。2. Description of the Related Art Generally, steelmaking slag and / or hot metal pretreatment slag (hereinafter referred to as slag) remain in the form as it is because lime remains in the slag in a separated form (hereinafter referred to as free CaO). It is known that when it is used as a road material and a civil engineering material, it is expanded by hydroxylation and carbonation of free CaO.
【０００３】そこで、現在一般にスラグを自然冷却し、
破砕した後、屋外で山積みして、スラグ中の遊離ＣａＯ
を雨水等と空気に自然に接触させることにより、Ｃａ
（ＯＨ）2 あるいはＣａＣＯ3 に変化させ安定させてい
る。この工程は自然エージングと呼ばれている。この場
合に、天然の水だけではなく、人為的に温水および／ま
たは蒸気を供給して強制エージングを行う方法もある。
例えば、特開平４−２０２０３４号公報に開示されて
いるように、大気圧下で自然エージングを行う第１工程
と、大気圧下で蒸気エージングを行う第２工程とからな
る製鋼スラグのエージング方法である。Therefore, at present, the slag is generally cooled naturally,
After crushing, pile up outdoors and release CaO in slag
Ca is naturally contacted with rainwater and air,
It is stabilized by changing it to (OH) 2 or CaCO 3 . This process is called natural aging. In this case, there is also a method of artificially supplying hot water and / or steam in addition to natural water to perform forced aging.
For example, as disclosed in Japanese Patent Application Laid-Open No. 4-202034, a method for aging steelmaking slag comprising a first step of performing natural aging under atmospheric pressure and a second step of performing steam aging under atmospheric pressure. is there.
【０００４】また、特開平４−２５４１８７号公報に
開示されているように、破砕した製鋼スラグを搬送・排
出手段にて移動させながら、温水浴中に浸漬させて温水
エージングする製鋼スラグのエージング方法である。Further, as disclosed in Japanese Patent Application Laid-Open No. 4-254187, a method for aging steelmaking slag in which crushed steelmaking slag is moved by transporting / discharging means and immersed in a warmwater bath for hot water aging. Is.
【０００５】[0005]
【発明が解決しようとする課題】スラグがエージング中
に崩壊すると、スラグ中の粉化率が増加する。粉化率が
増加するとスラグの強度が低下し、道路材として使用が
困難になる。更に、最近高純度鋼製造のためスラグの塩
基度が上昇し、遊離ＣａＯが増加している。このことが
膨張量増大とエージング長期化の原因となっている。When the slag collapses during aging, the pulverization rate in the slag increases. When the pulverization rate increases, the strength of slag decreases, making it difficult to use as road material. Furthermore, the basicity of slag has recently increased due to the production of high-purity steel, and the amount of free CaO has increased. This is a cause of increased expansion and longer aging.
【０００６】本発明者は、最近のスラグについて、前記
特開平４−２０２０３４号公報および特開平４−２
５４１８７号公報の方法を実施した。しかし、いずれも
粉化率が増加し、かえってスラグの有効利用率が低下す
ることを見出した。また、遊離ＣａＯが多いため、蒸気
や温水のような強制エージングでも塩基度が高い最近の
スラグでは従来のスラグに比べて膨張安定化に時間がか
かり、道路材製造費を蒸気代や温水代が著しく押し上げ
る結果となった。The inventor of the present invention is concerned with recent slags by the above-mentioned JP-A-4-202034 and JP-A-4-2.
The method of 54187 publication was implemented. However, it was found that the pulverization rate increased and the effective utilization rate of slag decreased on the contrary. In addition, since the amount of free CaO is large, it takes more time to stabilize expansion in the recent slag that has a high basicity even with forced aging such as steam or hot water, compared to the conventional slag, and the road material manufacturing cost is reduced by steam and hot water costs. The result was a significant boost.
【０００７】本発明はこれらの前記の問題を解決し、粉
化率が増加せず且つエージング時間を短縮し、低コスト
でエージング促進を可能にすることを目的とする。It is an object of the present invention to solve these problems mentioned above, to prevent the pulverization rate from increasing, to shorten the aging time, and to promote the aging at a low cost.
【０００８】[0008]
【課題を解決するための手段】本発明はかかる課題を解
決するため、強制エージング前の製鋼スラグおよび／ま
たは溶銑予備処理スラグに、石炭灰を配合後の総重量の
１〜３０重量％となるように配合したものを強制エージ
ングすることを特徴とする。すなわち、転炉、電気炉あ
るいは混銑車などで発生した製鋼スラグおよび／または
溶銑予備処理スラグを冷却・凝固させる。次に、スラグ
を破砕する前、または途中、または後に、エージングす
る前のスラグに、配合後の総重量に対し石炭灰を１〜３
０重量％となるように配合する。配合のタイミングは、
スラグと石炭灰が均一に混合するならば、破砕する前、
途中あるいは後のいずれでもよい。In order to solve the above problems, the present invention provides 1 to 30% by weight of the total weight of the steelmaking slag before forced aging and / or the hot metal pretreatment slag after the coal ash is added. It is characterized by forcibly aging the mixture. That is, the steelmaking slag and / or the hot metal pretreatment slag generated in a converter, an electric furnace, a hot metal car, etc. are cooled and solidified. Next, before, during, or after crushing the slag, 1 to 3 liters of coal ash is added to the slag before aging with respect to the total weight after compounding.
It is blended so as to be 0% by weight. The timing of blending is
If slag and coal ash are mixed uniformly, before crushing,
Either in the middle or after.
【０００９】また、強制エージング前の製鋼スラグおよ
び／または溶銑予備処理スラグに、石炭灰、シルト、高
炉スラグのうち少なくとも１種または２種以上を、配合
後の総重量の１〜３０重量％となるように配合したもの
を、蒸気および／または温水で強制エージングすること
を特徴とする。すなわち、転炉、電気炉あるいは混銑車
などで発生した製鋼スラグおよび／または溶銑予備処理
スラグを冷却・凝固させ、次に、スラグを破砕する前、
または途中、または後に、エージングする前のスラグ
に、配合後の総重量に対し石炭灰、シルト、高炉スラグ
のうち少なくとも１種または２種以上を１〜３０重量％
となるように配合する。Further, at least one kind or two or more kinds of coal ash, silt, and blast furnace slag are added to the steelmaking slag and / or the hot metal pretreatment slag before forced aging in an amount of 1 to 30% by weight based on the total weight after mixing. What is compounded so that it is characterized by performing forced aging with steam and / or warm water. That is, before the steelmaking slag and / or the hot metal pretreatment slag generated in a converter, an electric furnace or a hot metal car is cooled and solidified, and then the slag is crushed,
1-30% by weight of at least one kind or two or more kinds of coal ash, silt, and blast furnace slag with respect to the total weight after compounding in the slag before aging or during or after
Blend so that
【００１０】この配合のタイミングは、スラグと石炭
灰、シルト、高炉スラグのうち少なくとも１種または２
種以上が均一に混合するならば、破砕する前、途中ある
いは後のいずれでもよい。また、破砕後で強制エージン
グ前の製鋼スラグおよび／または溶銑予備処理スラグ
に、平均粒径が０．０１〜１．２mmとなるように破砕し
た高炉水砕スラグを、配合後の総重量の１〜３０重量％
となるように配合したもの、あるいは破砕前または破砕
途中で、強制エージング前の製鋼スラグおよび／または
溶銑予備処理スラグに、高炉水砕スラグを配合後の総重
量の１〜３０重量％となるように配合した後、その全体
を破砕し、高炉水砕スラグの平均粒径が０．０１〜１．
２mmとなるようにしたものを蒸気および／または温水で
処理することを特徴とする。The timing of this mixing is at least one of slag, coal ash, silt, and blast furnace slag, or 2
If the seeds or more are uniformly mixed, they may be crushed before, during or after crushing. Further, the steelmaking slag and / or the hot metal pretreatment slag after crushing and before forced aging are crushed with granulated blast furnace slag having an average particle size of 0.01 to 1.2 mm to be 1% of the total weight after mixing. ~ 30% by weight
1 to 30% by weight of the total weight of the steel slag before forced aging and / or the hot metal pretreatment slag before forced aging and the granulated blast furnace slag before or during crushing. And then crushed the whole, and the granulated blast furnace slag has an average particle size of 0.01 to 1.
It is characterized in that the product of 2 mm is treated with steam and / or hot water.
【００１１】更に、強制エージング前の製鋼スラグおよ
び／または溶銑予備処理スラグに、平均粒径が０．０１
〜１．２mmとなるように、破砕した高炉水砕スラグと、
石炭灰、シルトの１種または２種以上を配合後の総重量
の１〜３０重量％となるように配合したものを蒸気およ
び／または温水で処理することを特徴とする。なお、本
発明における強制エージング法として次のいずれの方法
を採用してもよい。（１）蒸気エージング、（２）温水
エージング、（３）（１）と（２）の組み合わせ、
（４）自然エージングと（１）および／または（２）を
組み合わせる。Further, the steelmaking slag and / or the hot metal pretreatment slag before forced aging have an average particle size of 0.01
Granulated blast furnace slag that was crushed to ~ 1.2 mm,
It is characterized in that one or two or more kinds of coal ash and silt are blended so as to be 1 to 30% by weight of the total weight after blending, and treated with steam and / or warm water. Any of the following methods may be adopted as the forced aging method in the present invention. (1) Steam aging, (2) Hot water aging, (3) Combination of (1) and (2),
(4) Combine (1) and / or (2) with natural aging.
【００１２】ここで、蒸気エージングとは、スラグを蒸
気中に一定時間保持してスラグ中の遊離ＣａＯの水和を
行う方法である。また、温水エージングとは、スラグを
温水浴中に一定時間保持して、スラグ中の遊離ＣａＯの
水和を行う方法である。これらの方法は、スラグを野積
みして雨水等で遊離ＣａＯを水和させる自然エージング
に比べて、高温で且つ多量の水を接触させることができ
るので、水和反応は促進される。Here, the steam aging is a method of holding the slag in the steam for a certain period of time to hydrate the free CaO in the slag. The hot water aging is a method of holding the slag in a hot water bath for a certain period of time to hydrate the free CaO in the slag. These methods can contact a large amount of water at a high temperature as compared with natural aging in which slag is piled up and free CaO is hydrated with rainwater or the like, so that the hydration reaction is accelerated.
【００１３】[0013]
【作用】以下で、本発明の詳細について説明する。本発
明において、強制エージング前の製鋼スラグおよび／ま
たは溶銑予備処理スラグに、石炭灰、シルト、高炉スラ
グのうち少なくとも１種または２種以上を配合後の総重
量に対してその１〜３０重量％配合したものを強制エー
ジングする。The details of the present invention will be described below. In the present invention, the steelmaking slag before forced aging and / or the hot metal pretreatment slag, at least one kind or two or more kinds of coal ash, silt, and blast furnace slag are mixed in an amount of 1 to 30% by weight based on the total weight of the mixture. Force aged the blended.
【００１４】その結果、スラグ粒中の遊離ＣａＯと石炭
灰、シルト、高炉スラグの可溶性シリカが水の存在化で
反応し、不溶性のＣａＯ−ＳｉＯ2 −Ｈ2 Ｏゲル（以下
でＣＳＨゲルと呼ぶ）を生成する。この反応をポゾラン
反応と呼ぶ。石炭灰やシルト、高炉スラグを選ぶのは可
溶性シリカが溶出しやすく、ポゾラン反応が起こりやす
いからである。シルトとは、土質材料の中で５〜７４ミ
クロンの粒径範囲のものである。As a result, free CaO in the slag particles reacts with coal ash, silt and soluble silica in the blast furnace slag in the presence of water, resulting in an insoluble CaO-SiO 2 -H 2 O gel (hereinafter referred to as CSH gel). ) Is generated. This reaction is called the pozzolan reaction. Coal ash, silt, and blast furnace slag are selected because soluble silica is likely to be eluted and a pozzolanic reaction is likely to occur. Silts are among the soil materials in the particle size range of 5 to 74 microns.
【００１５】また、高炉スラグには一般に、溶融状態か
ら徐冷処理したものと加圧水等で急冷処理したものとが
ある。前者を高炉徐冷スラグ、後者を高炉水砕スラグと
呼ぶ。本発明においては両者のいずれか、または両方を
用いてもよい。ポゾラン反応でＣＳＨゲルが生成するこ
とにより硬化が進行し、遊離ＣａＯが水と反応してＣａ
（ＯＨ）2 に変化する際の体積膨張で、発生した亀裂が
ＣＳＨゲルによって塞がっていき、粉化が抑制される。
また、水中のＣａ2+がＣＳＨゲル生成で消費されるた
め、遊離ＣａＯの水和および生成したＣａ（ＯＨ）2 の
水中への溶解が促進される。これはエージングが促進さ
れることを意味する。Further, blast furnace slag is generally classified into one that is gradually cooled from a molten state and one that is rapidly cooled with pressurized water or the like. The former is called blast furnace slowly cooled slag, and the latter is called granulated blast furnace slag. In the present invention, either or both may be used. Curing progresses due to the formation of CSH gel by the pozzolan reaction, and free CaO reacts with water to react with Ca.
Due to the volume expansion when changing to (OH) 2 , the generated cracks are closed by the CSH gel, and pulverization is suppressed.
In addition, since Ca 2+ in water is consumed by CSH gel formation, hydration of free CaO and dissolution of generated Ca (OH) 2 in water are promoted. This means that aging is accelerated.
【００１６】すなわち、遊離ＣａＯの水和によりその表
面に固体層のＣａ（ＯＨ）2 が形成されるが、この固体
層が遊離ＣａＯの水和を妨げる。従って水和を促進する
ためには、固体層のＣａ（ＯＨ）2 の溶解を促進しなけ
ればならない。しかし、Ｃａ（ＯＨ）2 の溶解度は小さ
いので（０℃で０．１８５、１００℃で０．０７７）、
スラグ粒周囲の水はすぐにＣａ2+で飽和して固体層のＣ
ａ（ＯＨ）2 が溶解できなくなる。That is, the hydration of free CaO forms a solid layer of Ca (OH) 2 on its surface, and this solid layer hinders the hydration of free CaO. Therefore, in order to promote hydration, the dissolution of Ca (OH) 2 in the solid layer must be promoted. However, since the solubility of Ca (OH) 2 is small (0.185 at 0 ° C, 0.077 at 100 ° C),
The water around the slag particles is immediately saturated with Ca 2+ and becomes C in the solid layer.
a (OH) 2 cannot be dissolved.
【００１７】しかし、不溶性のＣＳＨゲル生成で水中の
Ｃａ2+濃度が常に低い状態に維持されれば、Ｃａ（Ｏ
Ｈ）2 の溶解は促進される。一般に遊離ＣａＯの水和反
応は温度が高い方が反応速度が早い。従って、自然エー
ジングよりも蒸気や温水のような強制エージングの方が
膨張安定化に要する時間は短い。また、遊離ＣａＯの量
が増加すると、スラグ粒周辺の水もそれだけＣａ2+で飽
和しやすくなり、水中のＣａ2+濃度の方が水和反応を律
速するようになる。本発明では、水中のＣａ2+濃度を常
に低い状態に維持して、固体層のＣａ（ＯＨ）2の溶解
を促進させることを特徴とする。However, if the concentration of Ca 2+ in water is always kept low by the formation of insoluble CSH gel, Ca (O 2
Dissolution of H) 2 is accelerated. Generally, the higher the temperature, the faster the reaction rate of the hydration reaction of free CaO. Therefore, forced aging such as steam or hot water requires less time for expansion stabilization than natural aging. Further, when the amount of free CaO increases, the water around the slag particles is more likely to be saturated with Ca 2+ , and the Ca 2+ concentration in the water determines the rate of hydration reaction. The present invention is characterized in that the Ca 2+ concentration in water is always maintained at a low state to promote the dissolution of Ca (OH) 2 in the solid layer.
【００１８】本発明において、石炭灰、シルト、高炉ス
ラグのうち少なくとも１種または２種以上の配合量を１
〜３０重量％とするのは、１重量％未満では以下で説明
するポゾラン反応が十分に行われず、３０重量％を越え
るとスラグの固結が生じ、ハンドリングが著しく困難に
なるからである。平均粒径については、石炭灰、シルト
の平均粒径が０．０１〜０．０３mmに対して高炉水砕ス
ラグの平均粒径は１．２〜２．５mmである。In the present invention, at least one kind of coal ash, silt, and blast furnace slag is used in an amount of 1 or more.
The reason for setting the content to 30% by weight is that if the amount is less than 1% by weight, the pozzolanic reaction described below is not sufficiently carried out, and if it exceeds 30% by weight, the slag is solidified and handling becomes extremely difficult. Regarding the average particle size, the average particle size of coal ash and silt is 0.01 to 0.03 mm, while the average particle size of granulated blast furnace slag is 1.2 to 2.5 mm.
【００１９】また、一般に高炉水砕スラグは大気に曝さ
れている間に表面が大気中の水分やＣＯ2 との反応によ
り徐々に不活性化し、可溶性シリカの溶出量が初期に比
べて低減する。以上の理由により高炉水砕スラグの場合
は、石炭灰やシルトに比べてポゾラン反応の反応性が低
い場合がある。そこで、高炉水砕スラグの平均粒径が
０．０１〜１．２mmとなるように破砕し、破砕後で強制
エージング前の製鋼スラグおよび／または溶銑予備処理
スラグに配合する。もしくは、高炉水砕スラグを破砕前
または破砕途中で、強制エージング前の製鋼スラグおよ
び／または溶銑予備処理スラグに、配合した後に高炉水
砕スラグの平均粒径が０．０１〜１．２mmとなるように
全体を破砕し、強制エージングする。In general, the surface of granulated blast furnace slag is gradually inactivated during the exposure to the atmosphere due to the reaction with moisture and CO 2 in the atmosphere, and the elution amount of soluble silica is reduced as compared with the initial stage. . For the above reasons, in the case of granulated blast furnace slag, the reactivity of the pozzolanic reaction may be lower than that of coal ash or silt. Therefore, the granulated blast furnace slag is crushed to have an average particle size of 0.01 to 1.2 mm, and is mixed with the steelmaking slag and / or the hot metal pretreatment slag after crushing and before forced aging. Alternatively, before or during the crushing of the granulated blast furnace slag, the average particle size of the granulated blast furnace slag becomes 0.01 to 1.2 mm after blending with the steelmaking slag and / or the hot metal pretreatment slag before forced aging So crush the whole and force aging.
【００２０】高炉水砕スラグを製鋼スラグへ、どのよう
なタイミングで配合するかを選ぶことにより、高炉水砕
スラグの平均粒径を０．０１〜１．２mmにすることがで
きる。このように、高炉水砕スラグの平均粒径を０．０
１〜１．２mmにすることにより、強制エージング時のポ
ゾラン反応の反応性が向上する。平均粒径を０．０１〜
１．２mmとするのは、０．０１mm未満では高炉水砕スラ
グの比表面積が増加し、大気中の水分やＣＯ2 との反応
がしやすくなり、かえって高炉水砕スラグ表面の不活性
化の進行が早くなるために、破砕コストがエージング促
進効果を上回り経済的でない。１．２mmを越えるとエー
ジング促進効果が不十分となり、やはり経済的でない。The average particle size of the granulated blast furnace slag can be set to 0.01 to 1.2 mm by selecting at what timing the granulated blast furnace slag is mixed with the steelmaking slag. Thus, the average particle size of granulated blast furnace slag is 0.0
When the thickness is 1 to 1.2 mm, the reactivity of the pozzolanic reaction during forced aging is improved. Average particle size 0.01-
If it is less than 0.01 mm, the specific surface area of the granulated blast furnace slag increases, and it becomes easy to react with moisture and CO 2 in the atmosphere. Due to the faster progress, the crushing cost is more economical than the aging promoting effect, which is not economical. If it exceeds 1.2 mm, the effect of promoting aging becomes insufficient, which is also uneconomical.
【００２１】[0021]
【実施例】以下、本発明を実施例に基づいて、更に詳細
に説明する。表１に転炉スラグと石炭灰、シルト、高炉
スラグの化学組成を示す。EXAMPLES The present invention will now be described in more detail based on examples. Table 1 shows the chemical composition of converter slag, coal ash, silt, and blast furnace slag.
【００２２】[0022]
【表１】 [Table 1]
【００２３】転炉スラグを冷却・凝固させた後、表２に
示す割合で石炭灰を配合し３０mm以下に破砕・磁選し
た。After the converter slag was cooled and solidified, coal ash was blended at the ratio shown in Table 2 and crushed and magnetically separated to 30 mm or less.
【００２４】[0024]
【表２】 [Table 2]
【００２５】次に、表２に示す条件で蒸気エージングと
温水エージングを行った。比較例としては、何も配合せ
ずに破砕・磁選したスラグをエージングしない場合（比
較例１）、特開平４−２０２０３４号公報に示されるよ
うに、大気圧下で自然エージングし、次に大気圧下で蒸
気エージングを行う場合（比較例２）、および特開平４
−２５４１８７号公報に示されるように、破砕した製鋼
スラグを搬送・排出手段にて移動させながら、温水浴中
に浸漬させて温水エージングを行う場合（比較例３）に
ついて比較例とした。表中の膨張量は鉄連法の８０℃温
水膨張試験により測定した。粉化率は、エージング直後
のスラグを破砕せずに乾燥して４メッシュのふるいにか
けて、ふるい通過重量の全重量に対する割合とした。ス
ラグの固結有無は、エージング直後のスラグの上にシャ
ベルを立てて日本人の平均体重をシャベルに静かにかけ
たときに、該スラグが崩れるかどうかで判断した。崩れ
れば固結は無しである。シルト、高炉スラグを添加して
エージングした実施例１〜７は比較例よりも膨張量が小
さく路盤材に使用可能な膨張量の基準値１．５％以下を
達成しており、粉化率も３６％以下であり、道路用材と
して使用することができた。Next, steam aging and hot water aging were performed under the conditions shown in Table 2. As a comparative example, when the crushed and magnetically selected slag is not aged without compounding (Comparative Example 1), as shown in JP-A-4-202034, natural aging is performed under atmospheric pressure, and then large aging is performed. When performing steam aging under atmospheric pressure (Comparative Example 2), and
As shown in Japanese Patent No. 254187, a comparative example was carried out in the case where the crushed steelmaking slag was moved by the transporting / discharging means and immersed in a hot water bath for hot water aging (Comparative Example 3). The expansion amount in the table was measured by the 80 ° C. hot water expansion test of the iron continuous method. The pulverization rate was defined as the ratio of the weight passed through the sieve to the total weight of the slag immediately after aging, which was dried without crushing and then passed through a 4-mesh sieve. Whether or not the slag was solidified was determined by whether or not the slag collapsed when a shovel was placed on the slag immediately after aging and the average weight of Japanese people was gently applied to the shovel. If it collapses, there is no consolidation. In Examples 1 to 7 in which silt and blast furnace slag were added and aged, the expansion amount was smaller than that of the comparative example, and the standard value of the expansion amount usable for the roadbed material was 1.5% or less. It was 36% or less and could be used as a road material.
【００２６】次に表３における転炉スラグにシルト、高
炉スラグを配合した場合について述べる。Next, the case where the silt and the blast furnace slag are mixed with the converter slag in Table 3 will be described.
【００２７】[0027]
【表３】 [Table 3]
【００２８】ここで用いたシルトは、山砂を水洗いした
ときに発生する泥水中の固形分で７４μｍ以下のもので
ある。転炉スラグを冷却・凝固させた後、表３に示す割
合でシルト、高炉スラグを配合し３０mm以下に破砕し
た。次に、表３に示す条件で蒸気エージングと温水エー
ジングを行った。シルト、高炉スラグを配合してエージ
ングした実施例６〜１２は比較例よりも膨張量が小さく
路盤材に使用可能な膨張量の基準値１．５％以下を達成
しており、粉化率も３６％以下であり、道路用材として
使用することができた。The silt used here has a solid content of 74 μm or less in the mud water generated when the mountain sand is washed with water. After the converter slag was cooled and solidified, silt and blast furnace slag were mixed in the proportions shown in Table 3 and crushed to 30 mm or less. Next, steam aging and hot water aging were performed under the conditions shown in Table 3. In Examples 6 to 12 in which silt and blast furnace slag were mixed and aged, the expansion amount was smaller than the comparative example, and the standard value of the expansion amount usable for the roadbed material was 1.5% or less, and the pulverization rate was also. It was 36% or less and could be used as a road material.
【００２９】また、転炉スラグに石炭灰を１０wt％、シ
ルトを１０wt％、高炉水砕スラグを５wt％配合し、蒸気
エージングを４０（kg／ｔ−Slag）で行った結果、膨張
量は０．２２％、粉化率は３３％で、スラグの固結もな
く道路用材として使用することができた。更に、表４に
おける転炉スラグに配合する高炉水砕スラグの平均粒径
が０．０１〜１．２mmであるように破砕した場合につい
て述べる。When the converter slag was blended with 10 wt% of coal ash, 10 wt% of silt and 5 wt% of granulated blast furnace slag, and steam aging was carried out at 40 (kg / t-Slag), the expansion amount was 0. .22%, the pulverization rate was 33%, and it could be used as a road material without solidification of slag. Further, the case where the granulated blast furnace slag compounded in the converter slag in Table 4 is crushed so that the average particle size is 0.01 to 1.2 mm will be described.
【００３０】[0030]
【表４】 [Table 4]
【００３１】転炉スラグを冷却・凝固させた後、３０mm
以下に破砕した。表４に示す条件で高炉水砕スラグを破
砕し転炉スラグに配合して表４に示す条件で蒸気エージ
ングと温水エージングを行った。ただし、実施例２０で
は転炉スラグを冷却・凝固させた後、高炉水砕スラグを
配合して全体として３０mm以下になるように破砕した。
このとき、破砕後の高炉水砕スラグの平均粒径は０．５
mmとなった。実施例１３〜２０は比較例よりも膨張量が
小さいだけでなく、表３と比較してもより少ない配合量
で同等の効果が得られた。30 mm after cooling and solidifying the converter slag
Crushed into: The granulated blast furnace slag was crushed under the conditions shown in Table 4 and mixed with the converter slag, and steam aging and hot water aging were performed under the conditions shown in Table 4. However, in Example 20, after the converter slag was cooled and solidified, granulated blast furnace slag was mixed and crushed to a total size of 30 mm or less.
At this time, the average particle size of the granulated blast furnace slag after crushing is 0.5
It became mm. In Examples 13 to 20, not only the expansion amount was smaller than that in Comparative Example, but also when compared with Table 3, the same effect was obtained with a smaller compounding amount.
【００３２】なお、比較例において、比較例１はエージ
ングしないので膨張量が非常に大きい。比較例２は基準
値１．５％以下が達成されず、粉化率も増加した。比較
例３も同様に基準値１．５％以下が達成されず、粉化率
も増加した。比較例４は膨張量と粉化率は小さいが、ス
ラグの固結が発生した。In the comparative example, the comparative example 1 does not age, so that the expansion amount is very large. In Comparative Example 2, the standard value of 1.5% or less was not achieved, and the pulverization rate also increased. Similarly, in Comparative Example 3, the standard value of 1.5% or less was not achieved, and the pulverization rate also increased. In Comparative Example 4, the expansion amount and the pulverization rate were small, but the slag solidified.
【００３３】[0033]
【発明の効果】本発明により、製鋼スラグおよび／また
は溶銑予備処理スラグのエージング促進とスラグの粉化
防止が問題なく達成され、強制エージングにより得られ
たスラグを道路用材や土木用材に有効に使用することが
可能となる。Industrial Applicability According to the present invention, aging promotion of steelmaking slag and / or hot metal pretreatment slag and slag pulverization prevention can be achieved without problems, and the slag obtained by forced aging is effectively used for road materials and civil engineering materials. It becomes possible to do.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 横尾 正義 福岡県北九州市戸畑区飛幡町１−１ 新日 本製鐵株式会社八幡製鐵所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayoshi Yokoo 1-1 Tobata-cho, Tobata-ku, Kitakyushu-shi, Fukuoka Inside Nippon Steel Corporation Yawata Works
Claims (5)
または溶銑予備処理スラグに、石炭灰を配合後の総重量
の１〜３０重量％となるように配合したものを、蒸気お
よび／または温水で処理することを特徴とするスラグの
強制エージング方法。1. Steelmaking slag before forced aging and / or
Alternatively, a method for forced aging of slag, characterized in that hot ash slag pretreatment slag is mixed with coal ash in an amount of 1 to 30% by weight based on the total weight of the mixture, and then treated with steam and / or hot water.
または溶銑予備処理スラグに、石炭灰、シルト、高炉ス
ラグのうち少なくとも１種または２種以上を、配合後の
総重量の１〜３０重量％となるように配合したものを蒸
気および／または温水で処理することを特徴とするスラ
グの強制エージング方法。2. Steelmaking slag before forced aging and / or
Alternatively, the hot metal pretreatment slag is mixed with at least one kind or two or more kinds of coal ash, silt, and blast furnace slag so as to be 1 to 30% by weight of the total weight after mixing with steam and / or hot water. A method for forcibly aging slag characterized by treating.
グおよび／または溶銑予備処理スラグに、平均粒径が
０．０１〜１．２mmとなるように粉砕した高炉水砕スラ
グを、配合後の総重量の１〜３０重量％となるように配
合したものを蒸気および／または温水で処理することを
特徴とするスラグの強制エージング方法。3. A granulated blast furnace slag crushed to an average particle size of 0.01 to 1.2 mm is added to a steelmaking slag and / or hot metal pretreatment slag after crushing and before forced aging. A forcible aging method for slag, which comprises treating the mixture with 1 to 30% by weight of the total weight with steam and / or hot water.
ング前の製鋼スラグおよび／または溶銑予備処理スラグ
に、高炉水砕スラグを配合後の総重量の１〜３０重量％
となるように、配合した後に全体を粉砕し、高炉水砕ス
ラグの平均粒径が０．０１〜１．２mmとなるようにした
ものを蒸気および／または温水で処理することを特徴と
するスラグの強制エージング方法。4. 1 to 30% by weight of the total weight of the steelmaking slag before forced aging and / or the hot metal pretreatment slag before crushing or during crushing and blast furnace water granulated slag.
Slag characterized in that the whole is pulverized after being mixed so that the average particle size of the granulated blast furnace slag is 0.01 to 1.2 mm, and then treated with steam and / or hot water. Forced aging method.
または溶銑予備処理スラグに、平均粒径が０．０１〜
１．２mmとなるように破砕した高炉水砕スラグと、石炭
灰、シルトの１種または２種とを、配合後の総重量の１
〜３０重量％となるように配合したものを蒸気および／
または温水で処理することを特徴とするスラグの強制エ
ージング方法。5. Steelmaking slag before forced aging and / or
Alternatively, the hot metal pretreatment slag has an average particle size of 0.01 to
Granulated blast furnace slag that was crushed to 1.2 mm and one or two types of coal ash and silt were added to the total weight of 1 after mixing.
Steam and / or a mixture of about 30% by weight
Alternatively, a method for forced aging of slag characterized by treating with hot water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26964294A JP3190216B2 (en) | 1993-11-22 | 1994-11-02 | How to force aging of slag |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29208493 | 1993-11-22 | ||
| JP5-316875 | 1993-12-16 | ||
| JP31687593 | 1993-12-16 | ||
| JP5-292084 | 1993-12-16 | ||
| JP26964294A JP3190216B2 (en) | 1993-11-22 | 1994-11-02 | How to force aging of slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07223857A true JPH07223857A (en) | 1995-08-22 |
| JP3190216B2 JP3190216B2 (en) | 2001-07-23 |
Family
ID=27335739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26964294A Expired - Fee Related JP3190216B2 (en) | 1993-11-22 | 1994-11-02 | How to force aging of slag |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3190216B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001261387A (en) * | 2000-03-24 | 2001-09-26 | Kawasaki Steel Corp | Solidification method for steelmaking slag |
| JP2009126747A (en) * | 2007-11-26 | 2009-06-11 | Nippon Steel Corp | Method for treating slug |
| JP2014024713A (en) * | 2012-07-26 | 2014-02-06 | Kobe Steel Ltd | Steel slag hydration product, and production method of the same |
-
1994
- 1994-11-02 JP JP26964294A patent/JP3190216B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001261387A (en) * | 2000-03-24 | 2001-09-26 | Kawasaki Steel Corp | Solidification method for steelmaking slag |
| JP2009126747A (en) * | 2007-11-26 | 2009-06-11 | Nippon Steel Corp | Method for treating slug |
| JP2014024713A (en) * | 2012-07-26 | 2014-02-06 | Kobe Steel Ltd | Steel slag hydration product, and production method of the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3190216B2 (en) | 2001-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5393342A (en) | Cement composition and method for the preparation thereof | |
| US4756761A (en) | Methods of making cementitious compositions from waste products | |
| JP2001270746A (en) | Method for producing slag hardened body | |
| JP2003306359A (en) | Cement composition and hydrated hardened body | |
| JP4865976B2 (en) | Method for oxidizing steel slag and LD slag obtained thereby | |
| JP3091177B2 (en) | Steelmaking reduction slag reforming method | |
| JP3782376B2 (en) | Method for suppressing fluorine elution from smelting slag containing fluorine | |
| JPH07223857A (en) | Forced aging method for slag | |
| CA2100125A1 (en) | Method for preparing a cement base material, together with a cement composition containing this base material | |
| JPH09100470A (en) | Hardening of soil | |
| CN115925286A (en) | Low-cost multi-source solid waste filling cementing material and preparation method and application thereof | |
| JP2007063061A (en) | Method for aging slag | |
| JP3240053B2 (en) | Method for producing Portland cement from electric furnace slag | |
| WO1989004815A1 (en) | Methods of making cementitious compositions from waste products | |
| JP5381383B2 (en) | Method for producing non-inflatable roadbed material | |
| JP2001019529A (en) | Cement hardened product | |
| JP7570774B2 (en) | Cement composition for ground improvement | |
| JP2001501160A (en) | Method for converting iron-containing residue into artificial rock | |
| JP7405263B2 (en) | Method for carbonating CaO-containing substances and method for producing carbonated substances | |
| JPH0848549A (en) | Slag curing material | |
| WO2024052265A1 (en) | Method for activating basic oxygen furnace steel slag | |
| WO2023146489A1 (en) | Production of rapid hardening geopolymer repair material | |
| JPH0369535A (en) | Utilizing method for dust in steel manufacture | |
| JPH11292588A (en) | Method for reducing water absorptivity of blast furnace slowly cooled slag | |
| JPH0859309A (en) | Promotion of aging of steelmaking slag |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20010410 |
|
| LAPS | Cancellation because of no payment of annual fees |