JP2001261421A - Solidifying method of slag at steel making - Google Patents
Solidifying method of slag at steel makingInfo
- Publication number
- JP2001261421A JP2001261421A JP2000083425A JP2000083425A JP2001261421A JP 2001261421 A JP2001261421 A JP 2001261421A JP 2000083425 A JP2000083425 A JP 2000083425A JP 2000083425 A JP2000083425 A JP 2000083425A JP 2001261421 A JP2001261421 A JP 2001261421A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- steelmaking slag
- water
- solidifying
- steelmaking
- 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
- 239000002893 slag Substances 0.000 title claims abstract description 102
- 238000009628 steelmaking Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000010828 elution Methods 0.000 claims abstract description 16
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 13
- 239000003513 alkali Substances 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims description 15
- 238000004898 kneading Methods 0.000 claims description 8
- 230000032683 aging Effects 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 15
- 239000000203 mixture Substances 0.000 abstract description 6
- 239000002269 analeptic agent Substances 0.000 abstract 1
- 238000007796 conventional method Methods 0.000 abstract 1
- 239000006185 dispersion Substances 0.000 abstract 1
- 238000007711 solidification Methods 0.000 description 9
- 230000008023 solidification Effects 0.000 description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 8
- 239000000047 product Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 238000007670 refining Methods 0.000 description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- LFYJSSARVMHQJB-QIXNEVBVSA-N bakuchiol Chemical compound CC(C)=CCC[C@@](C)(C=C)\C=C\C1=CC=C(O)C=C1 LFYJSSARVMHQJB-QIXNEVBVSA-N 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- 235000012255 calcium oxide Nutrition 0.000 description 4
- 239000004567 concrete Substances 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000009257 reactivity Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- 101001024616 Homo sapiens Neuroblastoma breakpoint family member 9 Proteins 0.000 description 1
- 102100037013 Neuroblastoma breakpoint family member 9 Human genes 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- -1 etc.) Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000004936 stimulating effect Effects 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
- C04B5/06—Ingredients, other than water, added to the molten slag or to the granulating medium or before remelting; Treatment with gases or gas generating compounds, e.g. to obtain porous slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、製鋼スラグの固化
方法に係わり、製鋼工程で大量に発生する粉粒状の製鋼
スラグの処理方法であって、路盤用材、建材土木用材等
の有用な無機質材料を製造しうる技術である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for solidifying steelmaking slag, and more particularly to a method for treating powdery and granular steelmaking slag generated in a large amount in a steelmaking process. The method is useful for roadbed materials, construction materials and civil engineering materials. It is a technology that can be manufactured.
【０００２】[0002]
【従来の技術】通常、鋼を溶製する際に生じる製鋼スラ
グには、溶製時に使用した生石灰（ＣａＯ）の一部が未
反応の状態で遊離石灰として残存している。この遊離石
灰が何らかの水（雨水、海水、コンクリート施工用水
等）に接触すると、消石灰（Ｃａ（ＯＨ）2）を形成
し、その形成に伴う体積膨脹により崩壊する。そのた
め、該製鋼スラグを利用した構造物も崩壊する恐れがあ
り、現在は、製鋼スラグのほとんどが産業廃棄物として
埋め立て処分されている。しかし、近年、処分地確保の
困難性や処分コストの増大等で、資源有効利用の対象に
挙げられ、その利用技術の開発が盛んに行なわれてい
る。2. Description of the Related Art Usually, a part of quicklime (CaO) used at the time of smelting remains as free lime in an unreacted state in steelmaking slag generated when smelting steel. When this free lime comes into contact with some kind of water (rainwater, seawater, concrete construction water, etc.), slaked lime (Ca (OH) 2 ) is formed and collapsed by volume expansion accompanying the formation. Therefore, there is a possibility that the structure using the steelmaking slag may collapse, and at present, most of the steelmaking slag is landfilled as industrial waste. However, in recent years, due to difficulties in securing a disposal site and an increase in disposal costs, it has been cited as a target for effective use of resources, and its utilization technology has been actively developed.
【０００３】例えば、特開平１０−１３００４２号公報
は、製鋼スラグの前記膨脹を抑制するため、潜在水硬性
又はポゾラン反応性を有するＳｉＯ2含有物質と混合す
る技術を開示している。ここで、潜在水硬性とは、その
もの自体が有するアルカリ等の刺激により水硬反応を活
発にする特性であり、ポゾラン反応性とは、別途添加す
るアルカリ（アルカリ刺激剤という）と反応し、１Ｃａ
Ｏ−ｍＳｉＯ2−ｎＨ2Ｏ系のゲルを生成し、硬化する特
性である。従って、この技術は、製鋼スラグの遊離石灰
と前記ＳｉＯ2含有物質が接触すると、ポゾラン反応が
起こり、消石灰の生成が抑制できるという理屈である。For example, Japanese Patent Application Laid-Open No. Hei 10-130042 discloses a technique of mixing a steelmaking slag with an SiO 2 -containing substance having latent hydraulicity or pozzolan reactivity in order to suppress the expansion of the slag. Here, the latent hydraulic property is a property that activates the hydraulic reaction by stimulating the alkali or the like of the substance itself, and the pozzolanic reactivity is a property that reacts with an alkali (referred to as an alkali stimulant) that is separately added and reacts with 1Ca
O-mSiO 2 —nH 2 O-based gel is generated and cured. Therefore, this technology is based on the theory that when free lime of steelmaking slag comes into contact with the above-mentioned SiO 2 -containing substance, a pozzolanic reaction occurs and the production of slaked lime can be suppressed.
【０００４】また、特開平１０−２８７４５４号公報
は、製鋼スラグと石炭灰（フライアッシュ）とをある量
比で混合してなる細骨材（高炉スラグ細骨材を追加して
も良い）を、コンクリートの施工に使用して良好な結果
を得たことを開示している。この場合、石炭灰は前記ポ
ゾラン反応性を有するＳｉＯ2含有物質に相当するの
で、着眼点は、前記特開平１０−１３００４２号公報記
載の技術と同じである。Japanese Patent Application Laid-Open No. Hei 10-287454 discloses a fine aggregate obtained by mixing steelmaking slag and coal ash (fly ash) at a certain ratio (a fine aggregate of blast furnace slag may be added). Discloses that it has been used in concrete construction with good results. In this case, coal ash corresponds to the SiO 2 -containing substance having the pozzolan reactivity, and therefore, the point of view is the same as that of the technique described in JP-A-10-130042.
【０００５】さらに、特開平１０−１５２３６４号公報
は、風砕処理の施されていない製鋼スラグを用い、しか
も使用中に遊離石灰の水和反応による破壊の起こらない
コンクリートやモルタルのような水和硬化体にするとい
う興味深い技術を提案している。具体的には、製鋼スラ
グを含有する骨材と、潜在水硬性を有するシリカ含有物
質とポゾラン反応性を有するＳｉＯ2含有物質のうち１
種または２種を５０重量％以上含有する水和反応によっ
て硬化する結合材とを有してなる製鋼スラグを利用した
水和硬化体である。そして、この技術では、製鋼スラグ
として、転炉、電気炉、混銑車等で発生したスラグのみ
ならず溶銑予備処理スラグも用いることができると記載
されている。Further, Japanese Patent Application Laid-Open No. H10-152364 discloses a method of using steelmaking slag that has not been subjected to air crushing and that does not cause breakage due to hydration of free lime during use, such as concrete or mortar. He proposes an interesting technique of making a cured product. Specifically, the aggregate containing steelmaking slag, of SiO 2 containing material having a silica-containing material and the pozzolanic reactive with latent hydraulic 1
A hydrated hardened product utilizing steelmaking slag, comprising a binder hardened by a hydration reaction containing 50% by weight or more of a seed or two kinds. In this technology, it is described that not only slag generated in a converter, an electric furnace, a mixed iron wheel, but also hot metal pretreatment slag can be used as steelmaking slag.
【０００６】ところが、特開平１０−１５２３６４号公
報記載の技術を試行し、その効果を確認したところ、製
鋼スラグとして転炉スラグや電気炉スラグを採用した場
合には良い結果が得られたが、混銑車や高炉鋳床で溶銑
の予備処理をした時に生じたスラグ等では、望ましい結
果にならないことが多かった。最近の製鋼事情は、鋼材
の厳しい品質要求に伴い、溶銑を予備処理したり、ある
いは転炉や電気炉で溶製した溶鋼を真空脱ガス装置等内
で再度精錬する（二次精練という）ことが多くなる。従
って、それら溶銑予備処理や二次精錬工程で発生するス
ラグの量が従来より一層増加する傾向にあり、それらス
ラグを確実に有効利用できる技術の出現が期待される。However, when the technology described in Japanese Patent Application Laid-Open No. 10-152364 was tried and its effect was confirmed, good results were obtained when converter slag or electric furnace slag was used as steelmaking slag. Slags and the like generated during pretreatment of hot metal in a mixed iron wheel or a blast furnace cast floor often did not produce desirable results. In recent steelmaking situations, due to strict quality requirements of steel materials, pretreatment of molten iron or refining of molten steel in a converter or electric furnace in a vacuum degassing device etc. (referred to as secondary refining) Increase. Therefore, the amount of slag generated in the hot metal pretreatment and the secondary refining process tends to increase more than ever before, and the emergence of a technology capable of reliably and effectively using such slag is expected.
【０００７】そこで、本出願人は、先に特願平１１−２
９３４４９号及び特願平１１−２９３４５０号にて、骨
材として使用するのに不適合な製鋼スラグを素材にし
て、高強度なスラグの水和硬化体を製造する方法を提案
した。これによって、上記溶銑予備処理スラグ等を利用
した場合の問題点が解消できた。Accordingly, the present applicant has previously filed Japanese Patent Application No.
Japanese Patent Application No. 93449 and Japanese Patent Application No. 11-293450 have proposed a method for producing a hydrated hardened product of high-strength slag by using steelmaking slag that is unsuitable for use as an aggregate. Thereby, the problem in the case of using the hot metal pretreatment slag or the like could be solved.
【０００８】しかしながら、詳細に調査すると、それら
技術で得た水和硬化体でも、その圧縮強度の値は大きく
バラツキ、安定した特性を有する製品という観点ではま
だ問題があった。路盤材や建築土木材と言えども、特性
が安定していないと、実用に供し難いので、前記した多
くの技術は、まだ改良する余地がある。However, a detailed investigation has revealed that even the hydrated cured products obtained by these techniques have a large variation in compressive strength and still have problems in terms of products having stable characteristics. Even if it is a roadbed material or building soil wood, it is difficult to put it to practical use if its properties are not stable, so that many of the above-mentioned technologies still have room for improvement.
【０００９】[0009]
【発明が解決しようとする課題】本発明は、かかる事情
に鑑み、スラグ硬化体の圧縮強度のバラツキを従来より
低減可能な製鋼スラグの固化方法を提供することを目的
としている。SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for solidifying steelmaking slag which can reduce the variation in the compressive strength of a hardened slag body.
【００１０】[0010]
【課題を解決するための手段】発明者は、本発明の目的
を達成するため、従来技術の改良に鋭意努力し、その成
果を本発明に具現化した。Means for Solving the Problems In order to achieve the object of the present invention, the inventor worked diligently to improve the prior art and embodied the results in the present invention.
【００１１】すなわち、本発明は、Ｎａを含有する製鋼
スラグとシリカ含有物質とを水で混練してスラグ硬化体
とする製鋼スラグの固化方法において、前記製鋼スラグ
に予めＮａ溶出の低減処理を施してから、該製鋼スラグ
に前記シリカ含有物質と共に、Ｃａ系アルカリ刺激剤を
添加、混練することを特徴とする製鋼スラグの固化方法
である。That is, the present invention provides a method for solidifying a steelmaking slag which comprises kneading a steelmaking slag containing Na and a silica-containing substance with water to form a hardened slag, wherein the steelmaking slag is subjected to a treatment for reducing Na elution in advance. Thereafter, a Ca-based alkali stimulant is added to the steelmaking slag together with the silica-containing substance, followed by kneading, and the mixture is kneaded.
【００１２】また、本発明は、前記Ｎａ溶出の低減処理
により、１ｋｇの製鋼スラグを２リットルの水に浸した
際の水中へのＮａ溶出量を０．２ｍｇ／リットル以下と
することを特徴とする製鋼スラグの固化方法である。Further, the present invention is characterized in that the amount of Na eluted into water when 1 kg of steelmaking slag is immersed in 2 liters of water is 0.2 mg / liter or less by the treatment for reducing Na elution. This is a method for solidifying steelmaking slag.
【００１３】さらに、本発明は、前記Ｎａの低減処理
を、水洗、酸洗又はエージング処理により行なうことを
特徴とする製鋼スラグの固化方法である。Further, the present invention is a method for solidifying a steelmaking slag, wherein the treatment for reducing Na is performed by washing with water, pickling or aging.
【００１４】加えて、本発明は、前記Ｃａ系アルカリ刺
激剤がＣａの酸化物及び／又は水酸化物であることを特
徴とする製鋼スラグの固化方法である。In addition, the present invention provides a method for solidifying steelmaking slag, wherein the Ca-based alkali stimulant is an oxide and / or hydroxide of Ca.
【００１５】本発明では、Ｎａを含有する製鋼スラグか
らの溶出Ｎａ量を低減してから、シリカ含有物資を加え
たり、Ｃａ系アルカリ刺激剤を添加するようにしたの
で、製鋼スラグの固化が安定して生じるようになる。そ
の結果、従来に比べて圧縮強度のバラツキが低減し、特
性の安定した水和硬化体が製造できるようになる。In the present invention, since the amount of Na eluted from the steelmaking slag containing Na is reduced, the silica-containing material or the Ca-based alkali stimulant is added, so that the solidification of the steelmaking slag is stable. Will occur. As a result, the variation in compressive strength is reduced as compared with the related art, and a hydrated cured product having stable characteristics can be manufactured.
【００１６】[0016]
【発明の実施の形態】以下、発明をなすに至った経緯を
交え、本発明の実施の形態を説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the circumstances leading to the invention.
【００１７】まず、発明者は、スラグの水和硬化体の圧
縮強度がバラツク原因を詳細に検討した。そして、その
原因は、製鋼スラグの組成の複雑さにあると予想した。
製鋼スラグの範畴には、溶銑予備処理スラグ、転炉スラ
グ、電気炉スラグ、溶融還元炉スラグ、二次精錬スラ
グ、ステンレススラグ等、化学組成がそれぞれ大きく異
なるものが含まれる。そして、その成分について見る
と、ＳｉＯ2の極めて高いもの、またＣａＯやＮａ2Ｏの
多いもの、未滓化のＣａＯが多いもの、ＦｅＯに富むも
の等、雑多である。今迄は、これら製鋼スラグに同一の
処理を施してスラグ硬化体を製造していたが、いずれの
スラグを用いた場合でも、その特性が同一になるとする
のは無理であることに気がついた。First, the inventors examined in detail the cause of the variation in the compressive strength of the hydrated and hardened slag. And it was expected that the cause was due to the complexity of the composition of the steelmaking slag.
The categories of steelmaking slag include those with greatly different chemical compositions, such as hot metal pretreatment slag, converter slag, electric furnace slag, smelting reduction furnace slag, secondary refining slag, and stainless slag. In terms of the components, there are miscellaneous ones such as those having extremely high SiO 2 , those having a large amount of CaO and Na 2 O, those having a large amount of unreacted CaO, and those having a large amount of FeO. Until now, the same treatment has been applied to these steelmaking slags to produce hardened slag, but it has been realized that it is impossible to make the characteristics the same when using any of the slags.
【００１８】そして、引き続き、いずれの製鋼スラグを
用いても、それらの水硬体の圧縮強度がほぼ同程度にす
る手段がないかどうかを研究した。その結果、圧縮強度
に大きな影響を与える因子は、製鋼スラグが有するアル
カリ成分であることを知った。つまり、製鋼スラグにシ
リカ含有物質を加え、混練しても、該製鋼スラグから水
にＮａイオンとＣａイオンの両方が同時に溶け出すと、
その後シリカ含有物資等を加え、水和して固化した後の
スラグ硬化体の強度が低くなることがわかった。Subsequently, it was studied whether or not there was any means for making the hydraulic strengths of the hydraulic bodies substantially equal to each other using any steelmaking slag. As a result, it was found that the factor that greatly affected the compressive strength was the alkali component of the steelmaking slag. That is, even if the silica-containing substance is added to the steelmaking slag and kneaded, when both Na ions and Ca ions are simultaneously dissolved in water from the steelmaking slag,
Thereafter, it was found that the strength of the hardened slag after hydration and solidification by adding a silica-containing material or the like was reduced.
【００１９】そこで、発明者は、この事実を有効に利用
し、製鋼スラグにシリカ含有物質を加え、水で混練する
前に、予め該製鋼スラグからのＮａ溶出を低減すること
を着想し、それを本発明の重要な要件とした。本発明が
対象とする製鋼スラグは、上述したように、溶銑予備処
理スラグ、転炉スラグ、電気炉スラグ、溶融還元炉スラ
グ、二次精錬スラグ、ステンレススラグ等であり、それ
らの中でも、Ｎａを含有するスラグである。特に、Ｎａ
溶出量が０．２ｍｇ／リットル（水）を超えるようなス
ラグが好ましい。なお、本発明で言うスラグのＮａ溶出
量は、下記のようにして測定した値である。原料の製鋼
スラグを、固化体を製造する際に使用する粒度に粉砕
し、その１ｋｇを２リットルの純水中に加え、常温で１
時間保持する。その後、３０００ｒｐｍの回転速度で遠
心分離して、その上澄液に含まれるＮａイオンの濃度
（ｍｇ／リットル）を定量し、これをＮａ溶出量とす
る。また、製鋼スラグからのＮａ溶出量を低減する具体
的な手段としては、製鋼スラグの水洗、酸洗、あるいは
エージングが好ましい。Therefore, the inventor of the present invention effectively utilized this fact and conceived of adding a silica-containing substance to steelmaking slag and reducing the Na elution from the steelmaking slag before kneading with water. Was an important requirement of the present invention. The steelmaking slag targeted by the present invention is, as described above, hot metal pretreatment slag, converter slag, electric furnace slag, smelting reduction furnace slag, secondary refining slag, stainless slag, and the like. It is slag contained. In particular, Na
A slag having an elution amount exceeding 0.2 mg / liter (water) is preferable. In addition, the Na elution amount of slag referred to in the present invention is a value measured as follows. The raw steelmaking slag is pulverized to a particle size used for producing a solidified product, 1 kg of the raw material is added to 2 liters of pure water, and 1 kg is added at room temperature.
Hold for hours. Thereafter, the mixture is centrifuged at a rotation speed of 3000 rpm, the concentration (mg / liter) of Na ions contained in the supernatant is quantified, and this is defined as the Na elution amount. Further, as specific means for reducing the amount of Na eluted from the steelmaking slag, washing, pickling or aging of the steelmaking slag is preferable.
【００２０】さらに、本発明に係るいずれの方法も、ス
ラグに含まれる溶出性のＮａを予め、水、酸溶液あるい
は水溶液に溶出除去し、ＳｉＯ2含有物質と混練する際
に、Ｎａが過剰に溶出して固化を妨げることを防止する
ものである。加えて、どの方法で固化を行なう場合も、
事前に処理条件とスラグのＮａ溶出量の変化傾向を把握
しておき、製鋼スラグが所定のＮａ溶出量を示すように
なる条件で処理を行なうか、あるいは、Ｎａ溶出量低減
処理を行ないつつ、逐次スラグのサンプルを採取してそ
のサンプルの示すＮａ溶出量を測定し、その値が所定の
値になるまで処理を行なえば良い。Further, in any of the methods according to the present invention, the eluting Na contained in the slag is previously eluted and removed in water, an acid solution or an aqueous solution, and when kneading with the SiO 2 -containing substance, the Na is excessively increased. It is intended to prevent elution and hindering solidification. In addition, no matter which method is used for solidification,
In advance, the changing conditions of the Na elution amount of the processing conditions and the slag are grasped, and the steelmaking slag is processed under the condition that the predetermined Na elution amount is shown, or while performing the Na elution amount reduction process, What is necessary is just to take a sample of the slag successively, measure the Na elution amount indicated by the sample, and perform the processing until the value reaches a predetermined value.
【００２１】本発明では、製鋼スラグからのＮａ溶出量
が０．２ｍｇ／リットル以下になるように、上記の処理
をすることが好ましい。スラグの固化を左右するのは、
スラグ中に含まれるＮａの絶対量ではなく、あくまでも
溶出量だからである。そして、その量が０．２ｍｇ／リ
ットルを超えると、固化に要する時間や固化後のスラグ
固化体強度のばらつきが大きくなったり、極端な場合に
は固化自体が生じなくなることもあるからである。In the present invention, the above treatment is preferably performed so that the amount of Na eluted from the steelmaking slag is 0.2 mg / liter or less. What affects the solidification of slag is
This is because it is not an absolute amount of Na contained in the slag but an elution amount to the last. If the amount exceeds 0.2 mg / liter, the time required for solidification and the strength of the solidified slag after solidification vary greatly, and in extreme cases, solidification itself may not occur.
【００２２】従って、本発明は、このように事前に水溶
性のＮａが除去された製鋼スラグに、潜在水硬性を有す
るシリカ含有物質と、ポゾラン反応の促進を図るための
アルカリ刺激剤とを加え、水で混練して水和させ、スラ
グを固化させるものである。シリカ含有物質としては、
高炉水砕スラグ微粉末、フライアッシュ、セメント等が
好適に使用できる。また、これらに石膏を添加しても良
い。Accordingly, the present invention is to add a silica-containing substance having latent hydraulic property and an alkali stimulant for promoting the pozzolan reaction to the steelmaking slag from which water-soluble Na has been removed in advance. , And hydrated by kneading with water to solidify the slag. As a silica-containing substance,
Granulated blast furnace slag, fly ash, cement and the like can be suitably used. Further, gypsum may be added to these.
【００２３】ここで重要なことは、アルカリ刺激剤とし
てＣａ系のものに限定することである。Ｎａ系のものを
用いたのでは、除去したＮａが復活して不合理である
し、水硬体の圧縮強度が低下するからである。具体的に
は、Ｃａ系アルカリ刺激剤としては、Ｃａ（ＯＨ）2の
使用が良かった。混練時の水分の供給は、上記原料の混
合時に水を添加する方法、原料を乾燥状態で混合したの
ち蒸気や噴霧水などによって吸水浸透させれば良い。な
お、水分量は、全原料に対して外掛けで、１０〜２０質
量％程度である。What is important here is that the alkali stimulant is limited to a Ca-based stimulant. This is because, if a Na-based material is used, the removed Na will recover and be unreasonable, and the compressive strength of the hydraulic body will decrease. Specifically, Ca (OH) 2 was preferably used as the Ca-based alkali stimulant. Water may be supplied during kneading by a method of adding water at the time of mixing the raw materials, mixing the raw materials in a dry state, and then absorbing and permeating with steam or spray water. The water content is about 10 to 20% by mass on the basis of the total amount of the raw materials.
【００２４】[0024]
【実施例】表１に示す化学組成の製鋼スラグを４０ｍｍ
以下に微粉砕し、本発明に係る種々の固化方法を実施し
た。その際、効果を確認するための比較例も実施した。
実施条件を表２に、実施結果を表３に一括して示す。な
お、スラグ硬化体の圧縮強度は、ＪＩＳ Ａ １１０８
に規定されているコンクリートの圧縮強度試験方法によ
って測定した。EXAMPLE A steelmaking slag having the chemical composition shown in Table 1 was used for a 40 mm
Following pulverization, various solidification methods according to the present invention were performed. At that time, a comparative example for confirming the effect was also performed.
Table 2 shows the execution conditions, and Table 3 shows the execution results. The compression strength of the hardened slag is JIS A 1108.
It was measured by the concrete compressive strength test method specified in.
【００２５】[0025]
【表１】 [Table 1]
【００２６】[0026]
【表２】 [Table 2]
【００２７】[0027]
【表３】 [Table 3]
【００２８】表３より、いずれの製鋼スラグを用いて
も、硬化体の圧縮強度がほぼ同一になり、従来に比べて
バラツキが低減し（比較例参照）、且つその値は、路盤
材、建築土木用材として十分使用可能な範囲になること
が明らかである。From Table 3, it can be seen that no matter which steelmaking slag is used, the compressive strength of the hardened body is almost the same, the variation is reduced as compared with the conventional one (see Comparative Example), and the values are the values for the roadbed material and the building. It is clear that the range is sufficiently usable as a civil engineering material.
【００２９】[0029]
【発明の効果】以上述べたように、本発明により、従
来、産業廃棄物として処理されてきた製鋼スラグを、路
盤材、建築土木用材に大量に用いることが可能になっ
た。この結果は、資源の再利用、環境の向上などに寄与
するものと期待される。As described above, according to the present invention, it has become possible to use a large amount of steelmaking slag conventionally treated as industrial waste for roadbed materials and building civil engineering materials. This result is expected to contribute to resource reuse and environmental improvement.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ２１Ｃ 7/00 Ｃ２１Ｃ 7/00 Ｊ ４Ｋ０１４ // Ｃ２２Ｂ 7/04 Ｃ２２Ｂ 7/04 Ｂ 26/10 26/10 (Ｃ０４Ｂ 28/08 (Ｃ０４Ｂ 28/08 18:14 18:14 Ｃ 18:08 18:08 Ｚ 7:00 7:00 22:06） 22:06） Ｚ 103:60 103:60 (72)発明者 小菊 史男 千葉県千葉市中央区川崎町１番地 川崎製 鉄株式会社技術研究所内 (72)発明者 高木 正人 千葉県千葉市中央区川崎町１番地 川崎製 鉄株式会社技術研究所内 (72)発明者 熊谷 正人 千葉県千葉市中央区川崎町１番地 川崎製 鉄株式会社技術研究所内 Ｆターム(参考） 4G012 PA27 PA29 4K001 BA12 CA08 CA49 EA07 4K002 AE06 4K012 AB00 4K013 CF01 4K014 AE01 CE01 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) C21C 7/00 C21C 7/00 J4K014 // C22B 7/04 C22B 7/04 B 26/10 26/10 (C04B 28/08 (C04B 28/08 18:14 18:14 C 18:08 18:08 Z 7:00 7:00 22:06) 22:06) Z 103: 60 103: 60 (72) Inventor Fumio Kogiku 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Inside the Technical Research Laboratory, Kawasaki Steel Corporation (72) Inventor Masato Takagi 1-Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Kawasaki Steel Technology Research Institute, Inc. (72) Invention Person Masato Kumagai 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba F-term in Technical Research Laboratory, Kawasaki Steel Corporation (reference) 4G012 PA27 PA29 4K001 BA12 CA08 CA49 EA07 4K002 AE06 4K012 AB00 4K013 CF01 4K014 AE01 CE01
Claims (4)
物質とを水で混練してスラグ硬化体とする製鋼スラグの
固化方法において、 前記製鋼スラグに予めＮａ溶出の低減処理を施してか
ら、該製鋼スラグに前記シリカ含有物質と共に、Ｃａ系
アルカリ刺激剤を添加、混練することを特徴とする製鋼
スラグの固化方法。1. A method for solidifying steelmaking slag, which comprises kneading steelmaking slag containing Na and a silica-containing substance with water to form a hardened slag, wherein the steelmaking slag is subjected to a Na elution reduction treatment in advance. A method for solidifying steelmaking slag, comprising adding and kneading a Ca-based alkali stimulant to the steelmaking slag together with the silica-containing substance.
の製鋼スラグを２リットルの水に浸した際の水中へのＮ
ａ溶出量を０．２ｍｇ／リットル以下とすることを特徴
とする請求項１記載の製鋼スラグの固化方法。2. The method according to claim 1, wherein the treatment for reducing the elution of Na is 1 kg.
Of steelmaking slag in water when immersed in 2 liters of water
2. The method for solidifying steelmaking slag according to claim 1, wherein the elution amount is 0.2 mg / liter or less.
エージング処理により行なうことを特徴とする請求項１
又は２記載の製鋼スラグの固化方法。3. The method according to claim 1, wherein the treatment for reducing Na is performed by washing, pickling, or aging.
Or the method for solidifying steelmaking slag according to 2.
物及び／又は水酸化物であることを特徴とする請求項１
〜３のいずれかに記載の製鋼スラグの固化方法。4. The Ca-based alkaline stimulant is an oxide and / or hydroxide of Ca.
The method for solidifying steelmaking slag according to any one of claims 3 to 3.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007210848A (en) * | 2006-02-10 | 2007-08-23 | Jfe Steel Kk | Hydration-hardening body |
| JP2007269562A (en) * | 2006-03-31 | 2007-10-18 | Jfe Steel Kk | Hydrated hardened body having reinforcing rod excellent in neutralization resistance and salt damage resistance |
| JP2007269558A (en) * | 2006-03-31 | 2007-10-18 | Jfe Steel Kk | Hydrated hardened body having reinforcing rod excellent in neutralization resistance and salt damage resistance |
| JP2007269561A (en) * | 2006-03-31 | 2007-10-18 | Jfe Steel Kk | Hydrated hardened body having reinforcing rod excellent in neutralization resistance and salt damage resistance |
| JP2007269560A (en) * | 2006-03-31 | 2007-10-18 | Jfe Steel Kk | Hydrated hardened body having reinforcing rod excellent in neutralization resistance and salt damage resistance |
| JP2007269559A (en) * | 2006-03-31 | 2007-10-18 | Jfe Steel Kk | Hydrated hardened body having reinforcing rod excellent in neutralization resistance and salt damage resistance |
| JP2007269557A (en) * | 2006-03-31 | 2007-10-18 | Jfe Steel Kk | Hydrated hardened body having reinforcing rod excellent in neutralization resistance and salt damage resistance |
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| JP2007210848A (en) * | 2006-02-10 | 2007-08-23 | Jfe Steel Kk | Hydration-hardening body |
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| JP2007269558A (en) * | 2006-03-31 | 2007-10-18 | Jfe Steel Kk | Hydrated hardened body having reinforcing rod excellent in neutralization resistance and salt damage resistance |
| JP2007269561A (en) * | 2006-03-31 | 2007-10-18 | Jfe Steel Kk | Hydrated hardened body having reinforcing rod excellent in neutralization resistance and salt damage resistance |
| JP2007269560A (en) * | 2006-03-31 | 2007-10-18 | Jfe Steel Kk | Hydrated hardened body having reinforcing rod excellent in neutralization resistance and salt damage resistance |
| JP2007269559A (en) * | 2006-03-31 | 2007-10-18 | Jfe Steel Kk | Hydrated hardened body having reinforcing rod excellent in neutralization resistance and salt damage resistance |
| JP2007269557A (en) * | 2006-03-31 | 2007-10-18 | Jfe Steel Kk | Hydrated hardened body having reinforcing rod excellent in neutralization resistance and salt damage resistance |
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