JPH11349383A - Closing material for molten pig iron tapping port - Google Patents
Closing material for molten pig iron tapping portInfo
- Publication number
- JPH11349383A JPH11349383A JP10154142A JP15414298A JPH11349383A JP H11349383 A JPH11349383 A JP H11349383A JP 10154142 A JP10154142 A JP 10154142A JP 15414298 A JP15414298 A JP 15414298A JP H11349383 A JPH11349383 A JP H11349383A
- Authority
- JP
- Japan
- Prior art keywords
- tapping
- raw material
- binder
- refractory raw
- pig iron
- 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
Links
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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63448—Polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/63472—Condensation polymers of aldehydes or ketones
- C04B35/63476—Phenol-formaldehyde condensation polymers
-
- 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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63496—Bituminous materials, e.g. tar, pitch
-
- 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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Ceramic Products (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は早強性出銑口閉塞材
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fast-acting taphole plugging material.
【０００２】[0002]
【従来の技術】高炉の出銑口を閉塞するための出銑口閉
塞材としては、例えば、粘土を含む耐火原料と金属等の
焼結助剤にタール、フェノール樹脂などの有機バインダ
ーを配合してなる組成物が一般的に使用されている。2. Description of the Related Art As a tap hole closing material for closing a tap hole of a blast furnace, for example, an organic binder such as tar or phenol resin is blended with a refractory raw material including clay and a sintering aid such as a metal. Compositions are commonly used.
【０００３】高炉出銑口閉塞材に要求される一般的な特
性としては、 圧入機による充填性が良好なこと、
高温下での結合強度が大きく、対溶銑滓性に優れてい
ること、 開孔作業性がよいこと、 環境保全の面
から黒煙の発生や発塵の少ないこと等である。[0003] The general characteristics required for a blast furnace tap hole plugging material include good filling properties with a press-in machine,
It has high bonding strength at high temperature, excellent hot metal slag resistance, good drilling workability, and low generation of black smoke and dust from environmental protection.
【０００４】ところで、出銑口数が少ない小型あるいは
中型高炉においては、樋などの炉材補修期間を確保する
ため、１つの出銑口のみを使用して繰り返し出銑するこ
とがある（以下、連続出銑と記す）。一方、出銑口数が
多い大型高炉においても、上記の理由の他、出銑管理の
集約化及び省人化の観点から連続出銑が望まれている。
すなわち、一本の出銑口のみで連続出銑を行うことによ
り、出銑作業に関連するコストを低減できる可能性があ
るためである。[0004] In a small or medium-sized blast furnace having a small number of tap holes, tapping may be repeatedly performed using only one tap hole in order to secure a period for repairing furnace materials such as gutters. It is written as tapping). On the other hand, also in a large blast furnace having a large number of tap holes, continuous tapping is desired from the viewpoint of centralized tapping management and labor saving, in addition to the above reasons.
That is, by performing continuous tapping with only one tap hole, there is a possibility that costs related to tapping work can be reduced.
【０００５】連続出銑の場合は、通常の交互出銑と比較
し、閉塞後出銑までの時間が、特に２５００ｍ3 以上の
大型高炉では３０分以下、望ましくは１０分程度と著し
く短くなるため、前述した閉塞材の必要特性に加えて、
特に、 出銑口閉塞後短時間で硬化し、出銑時の摩耗
損傷に耐えうる強度に達すること。ただし、マッドガン
に充填された状態で硬化が進行しないこと、 出銑口
閉塞後短時間で揮発分が解放され、出銑開始時の発煙、
発塵が少ないこと、 使用時の溶銑及びスラグによる
化学的、物理的侵食に耐え、出銑口径の拡大がなく、安
定した出銑が長時間できる耐食性、耐摩耗性を有するこ
とが特に重要となる。[0005] In the case of continuous tapping, the time required for tapping after plugging is significantly shorter than that of ordinary alternating tapping, particularly 30 minutes or less, and preferably about 10 minutes in a large blast furnace of 2500 m 3 or more. , In addition to the required properties of the closing material described above,
In particular, it must harden in a short time after the tap hole is closed, and reach a strength that can withstand abrasion damage during tapping. However, the hardening does not progress in the state filled with the mud gun, the volatile components are released in a short time after the tap hole is closed, and smoke is generated at the start of tapping,
It is especially important to have low dust generation, withstand chemical and physical erosion by hot metal and slag during use, to have a stable tapping time for a long time without expanding the tap hole diameter, and to have wear resistance. Become.
【０００６】しかしながら、連続出銑時に使用される閉
塞材として、例えば従来一般的に使用されているタール
系閉塞材は、充填後の硬化が緩慢であるため、十分な初
期強度を確保するのが難しく、かつバインダーの揮発も
緩慢であるため出銑開始時の発煙・発塵が多く、安定し
た出銑あるいは環境保全の点で満足できるものではな
い。また、フェノール樹脂などの樹脂バインダーを用い
た閉塞材においても、熱可塑性樹脂のみを用いた場合は
タール系閉塞材と同様の特性となり、十分でない。However, as a plugging material used at the time of continuous tapping, for example, a tar-based plugging material which is generally used in the past is required to secure a sufficient initial strength because the hardening after filling is slow. It is difficult, and since the volatilization of the binder is slow, much smoke and dust are generated at the start of tapping, which is not satisfactory in terms of stable tapping or environmental protection. Also, in the case of using a sealing resin using only a resin binder such as a phenolic resin, when only a thermoplastic resin is used, the properties are the same as those of the tar-based closing material, which is not sufficient.
【０００７】これらの間題点を解決すべく、特性の改善
を図った閉塞材及び閉塞材に使用されるバインダーにつ
いては種々提案されており、早強特性の改善を目的に、
例えば、特公昭５６−６３９６号公報では、高炉用マッ
ドとして、各種耐火原料にレゾール型フェノール樹脂
（Ｒ）とノボラック型フェノール樹脂（Ｎ）の比率がＲ
／（Ｎ＋Ｒ）×１００＝３〜２５％、更にアルコール系
溶剤が４〜１５％であるバインダーを配合し、早強性、
高強度特性を有するとする。[0007] In order to solve these problems, various plugging materials with improved properties and binders used for the plugging materials have been proposed.
For example, in Japanese Patent Publication No. 56-6396, the ratio of a resol type phenol resin (R) and a novolak type phenol resin (N) to various refractory raw materials for a blast furnace mud is R.
/ (N + R) × 100 = 3 to 25%, and further, a binder having an alcoholic solvent of 4 to 15% is blended,
It has high strength characteristics.
【０００８】また、特開昭５７−８８０７１号公報で
は、ノボラック型フェノール・メチルフェノール共縮合
樹脂にヘキサメチレンテトラミンまたはレゾール型フェ
ノール樹脂を規定量含有させ、更にグリコール、芳香族
炭化水素、あるいは芳香族炭化水素油を規定量配合した
早強性高炉マッド用バインダー等が開示されている。Japanese Patent Application Laid-Open No. 57-88071 discloses that a novolak-type phenol / methylphenol cocondensation resin contains a prescribed amount of hexamethylenetetramine or resole-type phenol resin, and further contains glycol, aromatic hydrocarbon, or aromatic hydrocarbon. A binder for an early-strength blast furnace mud containing a prescribed amount of a hydrocarbon oil is disclosed.
【０００９】これらの公報に開示される技術は、熱可塑
性の樹脂を主体に熱硬化性樹脂を加えたバインダーを使
用して早強性を実現するものであるが、単に早強性を付
与したのみでは、熱間における可塑性が不足し、旧材と
の接着性が低下する結果、出銑時に容易に剥離し出銑口
径拡大を起こすこととなり、耐用性の面で満足できるも
のは得られない。また、バインダーの揮発も十分早いと
は言えず、出銑開始時にはかなりの発塵、発煙を伴い、
作業環境上間題がある。[0009] The techniques disclosed in these publications are to realize the early strength by using a binder mainly composed of a thermoplastic resin and adding a thermosetting resin. If only hot plasticity is insufficient, the adhesiveness with the old material is reduced, and as a result, it easily peels off at the time of tapping and the tapping diameter increases, so that satisfactory ones in terms of durability cannot be obtained . In addition, the volatilization of the binder is not fast enough, and at the start of tapping, considerable dust and smoke are generated,
There is a problem in the work environment.
【００１０】これらに対して、ピッチ等の熱間可塑性に
優れた物質を添加し、耐用性の間題を解決する方法とし
て、例えば、特公昭６３−２９７１９号公報では、耐火
原料１００重量部に、軟化点９０〜３００℃、固定炭素
４０％以上およびキノリン不溶分１０〜８０％の粉末状
ピッチ１〜２５重量部を配合し、ついでコンラドソン炭
素２５％以上の石油系重質油芳香族石油樹脂および熱硬
化性樹脂を含有する結合剤１５〜４０重量部を配合して
なる閉塞材組成物が開示されている。しかしながら、こ
れにおいても、連続出銑時における出銑開始直後の発
塵、発煙の問題ついては、解決されていない。In order to solve the problem of durability by adding a material having excellent hot plasticity such as pitch to the above, for example, Japanese Patent Publication No. Sho 63-29719 discloses a method of adding 100 parts by weight of a refractory raw material. Blended with 1 to 25 parts by weight of a powdery pitch having a softening point of 90 to 300 ° C., a fixed carbon of 40% or more and a quinoline insoluble content of 10 to 80%, and a petroleum heavy oil aromatic petroleum resin having a Conradson carbon of 25% or more An occlusion material composition comprising 15 to 40 parts by weight of a binder containing a thermosetting resin is disclosed. However, even in this case, the problems of dust generation and smoke generation immediately after the start of tapping during continuous tapping have not been solved.
【００１１】[0011]
【発明が解決しようとする課題】本発明は、早強特性お
よび耐用性に優れ、出銑開始後の発塵、発煙が極めて少
なく、良好な作業環境を実現することが可能な高炉出銑
口閉塞材を提供することを目的とする。DISCLOSURE OF THE INVENTION The present invention provides a blast furnace taphole which is excellent in early-strength properties and durability, generates very little dust and smoke after starting tapping, and can realize a good working environment. It is intended to provide an occlusion material.
【００１２】[0012]
【課題を解決するための手段】上記の従来技術の問題点
に鑑みて検討を重ねた結果、特定の粒度構成を有する耐
火原料配合物に、レゾール型フェノール樹脂及びノボラ
ック型フェノール樹脂の混合物に特定のコールタールピ
ッチを含有させたバインダーを適用することにより、短
時間で強度が発現し、出銑開始時の発煙、発塵が極めて
少ない高耐用性高炉出銑口閉塞材が得られることを見い
だし、本発明を完成した。As a result of repeated investigations in view of the above-mentioned problems of the prior art, a refractory raw material composition having a specific particle size composition was specified, and a mixture of a resol type phenol resin and a novolak type phenol resin was specified. By applying a binder containing coal tar pitch, it is possible to obtain a high-durability blast furnace tap hole plugging material that develops strength in a short time and generates very little smoke and dust at the start of tapping. Thus, the present invention has been completed.
【００１３】すなわち、本発明の出銑口閉塞材は、粒径
が１ｍｍ以上である耐火原料を２５〜４５重量％、粒径
が０．０７５ｍｍ以下である耐火原料を２５〜４０重量
％含有した耐火原料配合物に、レゾール型フェノール樹
脂（Ｒ）とノボラック型フェノール樹脂（Ｎ）と軟化点
が２５０〜４００℃のコールタールピッチ（Ｃ）とから
なり、重量比でＲ／（Ｒ＋Ｎ）＝０．１５〜０．４０、
Ｃ／（Ｒ＋Ｎ＋Ｃ）＝０．１〜０．３のバインダーを１
０〜２０重量％の割合で含有させたことを特徴とする。
また、上記のコールタールピッチの平均粒径が０．０５
ｍｍ以下であることを特徴とする。That is, the taphole plugging material of the present invention contains 25 to 45% by weight of a refractory raw material having a particle size of 1 mm or more and 25 to 40% by weight of a refractory raw material having a particle size of 0.075 mm or less. The refractory raw material composition comprises a resol type phenol resin (R), a novolak type phenol resin (N), and a coal tar pitch (C) having a softening point of 250 to 400 ° C., and R / (R + N) = 0 by weight ratio. .15 to 0.40,
C / (R + N + C) = 0.1-0.3 binder
It is characterized in that it is contained at a ratio of 0 to 20% by weight.
Further, the average particle size of the coal tar pitch is 0.05
mm or less.
【００１４】[0014]
【発明の実施の形態】本発明において使用できる耐火原
料は、アルミナ、ムライト、マグネシア、スピネル、シ
リカ、ジルコン等の酸化物原料の他、炭素原料、炭化珪
素、窒化珪素等の非酸化物原料等、高炉出銑口閉塞材に
一般的に使用される原料である。また、助剤として金属
類を添加することも可能である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Refractory raw materials usable in the present invention include oxide raw materials such as alumina, mullite, magnesia, spinel, silica and zircon, as well as non-oxide raw materials such as carbon raw materials, silicon carbide and silicon nitride. It is a raw material generally used for a blast furnace tap hole plugging material. It is also possible to add metals as auxiliary agents.
【００１５】本発明の特徴の一つは、比較的粒径の大き
い原料を多く用い、微粉末量を少なくしていることであ
る。これは、原料全体の粒表面積を減少させることによ
りバインダー添加量を低減させ、その結果使用時の発
煙、発塵を抑制することを目的としている。すなわち、
耐火原料配合物において、粒径が１ｍｍ以上は２５〜４
０重量％であることが好ましい。粒径が１ｍｍ以上の耐
火原料が４０重量％を超えると、原料間の摩擦抵抗が増
し、材料の充填性が低下するため好ましくない。また、
２５重量％未満では、バインダーを十分低減することが
できず、発煙、発塵抑制効果が不十分となる。なお、混
練性及び組織の均一性等の点から、配合物の最大粒子径
は３０ｍｍ程度以下とするのが好ましい。One of the features of the present invention is that a large amount of raw material having a relatively large particle size is used and the amount of fine powder is reduced. This is intended to reduce the amount of binder added by reducing the grain surface area of the entire raw material, and as a result, to suppress smoke and dust during use. That is,
In the refractory raw material composition, 25 to 4
It is preferably 0% by weight. If the refractory raw material having a particle size of 1 mm or more exceeds 40% by weight, the frictional resistance between the raw materials increases, and the filling property of the material is undesirably reduced. Also,
If the content is less than 25% by weight, the binder cannot be sufficiently reduced, and the effect of suppressing smoke and dust generation becomes insufficient. In addition, it is preferable that the maximum particle diameter of the compound is about 30 mm or less from the viewpoints of kneading properties and texture uniformity.
【００１６】一方、粒径が０．０７５ｍｍ以下の耐火原
料は、耐火原料配合物において、２５〜４０重量％であ
ることが好ましい。４０重量％を超えるとバインダー添
加量が多くなり、発煙、発塵が発生する問題が顕著にな
る。また、２５重量％未満では材料の変形性が低下し、
充填性が悪化するため好ましくない。On the other hand, the content of the refractory raw material having a particle size of 0.075 mm or less is preferably 25 to 40% by weight in the refractory raw material composition. If it exceeds 40% by weight, the amount of the binder to be added increases, and the problem of smoke and dust generation becomes significant. If the content is less than 25% by weight, the deformability of the material is reduced,
It is not preferable because the filling property is deteriorated.
【００１７】バインダーは、レゾール型フェノール樹脂
（Ｒ）とノボラック型フェノール樹脂（Ｎ）とコールタ
ールピッチ（Ｃ）とからなる。フェノール樹脂は、その
分子量により種々のものがあるが、ノボラック型フェノ
ール樹脂は平均分子量が２００〜１０００であり、熱可
塑性であり、それ自身は熱硬化性を有しない。また、レ
ゾール型フェノール樹脂は平均分子量が１３０〜１００
０であり、それ自身熱硬化性である。The binder comprises a resol type phenol resin (R), a novolak type phenol resin (N) and a coal tar pitch (C). There are various types of phenolic resins depending on their molecular weights. Novolak-type phenolic resins have an average molecular weight of 200 to 1000, are thermoplastic, and do not have thermosetting properties themselves. The resole type phenol resin has an average molecular weight of 130 to 100.
0, which is thermosetting itself.
【００１８】バインダーを構成するレゾール型フェノー
ル樹脂（Ｒ）とノボラック型フェノール樹脂（Ｎ）にお
いて、ＲとＮは重量比を、Ｒ／（Ｒ＋Ｎ）＝０．１５〜
０．４０、好ましくは０．２０〜０．３５である。Ｒ／
（Ｒ＋Ｎ）＜０．１５であると十分な早強性が得られ
ず、Ｒ／（Ｒ＋Ｎ）＞０．４０では、硬化が早すぎてマ
ッドガン中で固化する恐れがあり、かつ、熱間において
短時間で可塑性を失うため、旧材との接着性が低下し、
耐用性の低下が顕菩になるからである。バインダーを構
成するレゾール型フェノール樹脂とノボラック型フェノ
ール樹脂は混練性、充填性の面から常温で適度な粘性を
持つ液体でなければならないが、この目的のため樹脂が
可溶な溶剤を適量組み合わせることが可能である。In the resol type phenol resin (R) and the novolak type phenol resin (N) constituting the binder, the weight ratio of R and N is as follows: R / (R + N) = 0.15
0.40, preferably 0.20 to 0.35. R /
If (R + N) <0.15, sufficient early strength cannot be obtained, and if R / (R + N)> 0.40, curing may be too fast and solidify in the mud gun. Because it loses plasticity in a short time, the adhesiveness with the old material decreases,
This is because a decrease in durability becomes apparent. The resol-type phenolic resin and novolak-type phenolic resin that constitute the binder must be liquids with appropriate viscosity at room temperature in terms of kneading and filling properties, but for this purpose, combine an appropriate amount of a solvent in which the resin is soluble. Is possible.
【００１９】コールタールピッチ（Ｃ）の軟化点は２５
０〜４００℃であることが好ましく、更に好ましくは３
２５〜３７５℃である。軟化点が２５０℃以下では軟化
したピッチが硬化を阻害するようになるため、十分な早
強性が得られなくなり、また、固定炭素比率が低下する
ことにより、加熱後の炭素結合力が低下し、耐用性を損
なうため好ましくなく、４００℃以上では、熱間におけ
る可塑性付与特性が低下し十分な接着性が得られず、耐
用性の点で劣り好ましくない。The softening point of the coal tar pitch (C) is 25
The temperature is preferably 0 to 400 ° C, more preferably 3 to 400 ° C.
25-375 ° C. When the softening point is 250 ° C. or lower, the softened pitch inhibits hardening, so that sufficient early strength cannot be obtained, and the fixed carbon ratio is reduced, so that the carbon bonding force after heating is reduced. If the temperature is 400 ° C. or higher, the plasticity-imparting property at the time of heating is lowered, and sufficient adhesiveness cannot be obtained, and the durability is inferior.
【００２０】また、Ｃの割合は、Ｃ／（Ｒ＋Ｎ＋Ｃ）＝
０．１〜０．３、好ましくは０．１５〜０．２５であ
り、Ｃ／（Ｒ＋Ｎ＋Ｃ）＜０．１では、耐用性向上の効
果が少なく、Ｃ／（Ｒ＋Ｎ＋Ｃ）＞０．３では、コール
タールピッチの揮発成分の揮発が緩慢であるため、出銑
開始時の発塵、発煙が顕著になり、作業環境が悪化する
ためである。The ratio of C is C / (R + N + C) =
0.1 to 0.3, preferably 0.15 to 0.25. When C / (R + N + C) <0.1, the effect of improving the durability is small, and when C / (R + N + C)> 0.3, This is because the volatilization of the volatile components of the coal tar pitch is slow, so that dust generation and smoke generation at the start of tapping become remarkable, and the working environment deteriorates.
【００２１】コールタールピッチはバインダー中に混合
して用いるとよい。これはコールタールピッチの均一な
分散を実現するためである。骨材に直接混合した場合
は、コールタールピッチの分散が十分行われず、熱間に
おける接着性が低下するばかりか、組織の粗雑化を助長
することとなり耐用性を損なうため好ましくない。The coal tar pitch is preferably used as mixed in a binder. This is to achieve a uniform dispersion of the coal tar pitch. The direct mixing with the aggregate is not preferable because the coal tar pitch is not sufficiently dispersed, so that not only the hot adhesion is reduced, but also the structure becomes coarse and the durability is impaired.
【００２２】なお、コールタールピッチの平均粒径は
０．０５ｍｍ以下であることが好ましい。平均粒径が
０．０５ｍｍを超えると、沈降等の影響によりバインダ
ー中で偏在し易くなるため、均一な組織形成を妨げ、意
図した特性が得られなくなる。The average particle size of the coal tar pitch is preferably 0.05 mm or less. If the average particle size exceeds 0.05 mm, uneven distribution in the binder tends to occur due to the influence of sedimentation and the like, so that the formation of a uniform structure is prevented, and the intended characteristics cannot be obtained.
【００２３】バインダーの添加量はマッドガンの能力等
にも影響されるが、耐火原料組成物に対して通常１０〜
２０重量％程度が最適である。バインダーの添加量が１
０重量％未満の場合には、マッドガンによる出銑ロヘの
充填が不能となり、また、２０重量％を超える場合に
は、揮発分が必然的に多くなり、ガス化に伴う組織の粗
雑化を助長し、耐用性や容積安定性を損なう上、残留揮
発分が多くなることにより、出銑開始時の発煙、発塵が
顕著となり、作業環境が悪化するため好ましくない。以
下、実施例及び比較例を挙げて本発明を更に説明する。The amount of the binder to be added is affected by the ability of the mud gun and the like.
The optimum is about 20% by weight. The amount of binder added is 1
If the amount is less than 0% by weight, filling of the tapping area with a mud gun becomes impossible, and if the amount exceeds 20% by weight, volatile components are inevitably increased, which promotes coarsening of the structure due to gasification. However, the durability and the volume stability are impaired, and the residual volatile matter increases, so that the generation of smoke and dust at the start of tapping becomes remarkable, and the working environment deteriorates, which is not preferable. Hereinafter, the present invention will be further described with reference to Examples and Comparative Examples.
【００２４】[0024]
【実施例】下記の表１に、実施例及び比較例で使用した
フェノール樹脂の主な特性を示す。EXAMPLES Table 1 below shows the main characteristics of the phenolic resins used in Examples and Comparative Examples.
【００２５】[0025]
【表１】 [Table 1]
【００２６】下記の表２に実施例及び比較例で使用した
コールタールピツチの主な特性を示す。Table 2 below shows the main characteristics of the coal tar pitch used in the examples and comparative examples.
【００２７】[0027]
【表２】 [Table 2]
【００２８】下記の表３〜表５に示す骨材配合物とバイ
ンダーを万能ミキサーを用いて、バインダーが樹脂系の
場合（実施例１〜３、比較例４〜８）は４０℃、タール
系の場合（比較例９）は５０℃に保ち、良く混練して評
価試験用の練り土とした。Using an all-purpose mixer, an aggregate composition and a binder shown in Tables 3 to 5 below were used. When the binder was a resin type (Examples 1 to 3 and Comparative Examples 4 to 8), the temperature was 40 ° C. and a tar type. In the case of (Comparative Example 9), the mixture was kept at 50 ° C. and kneaded well to obtain a kneaded soil for an evaluation test.
【００２９】また、表３〜５に各種特性の試験結果を同
時に示す。表３〜５に示す特性の評価試験方法を以下に
説明する。Tables 3 to 5 also show test results of various characteristics. The evaluation test methods for the characteristics shown in Tables 3 to 5 will be described below.
【００３０】 押し出し抵抗圧力（充填抵抗圧力）：
４５℃で保温した図１に示す形状のステンレス製試料ホ
ルダー（ｌ1 ＝９ｃｍ、ｌ2 ＝６ｃｍ、ｌ3 ＝２６ｃ
ｍ、ｌ4 ＝１２ｃｍ、ｌ5 ＝２ｃｍ）に、同じく４５℃
で保温した練り土を充填し、図２に示す測定装置（図
中、８は試料押し出し用面板、９は試料ホルダー、１０
は台座、１１はシリンダーヘッド）を用いて、シリンダ
ーヘッド１１の押し出し速度を１０ｍｍ／ｓｅｃとした
ときの押し出し抵抗圧力（ＭＰａ）を測定した。Extrusion resistance pressure (filling resistance pressure):
A stainless steel sample holder (l 1 = 9 cm, l 2 = 6 cm, l 3 = 26c) having the shape shown in FIG. 1 kept at 45 ° C.
m, l 4 = 12 cm, l 5 = 2 cm) and 45 ° C.
2 and the measuring device shown in FIG. 2 (8 is a sample extruding face plate, 9 is a sample holder, 10
Is a pedestal and 11 is a cylinder head), and the extrusion resistance pressure (MPa) was measured when the extrusion speed of the cylinder head 11 was 10 mm / sec.
【００３１】 曲げ強度・見掛け気孔率：成形圧力５
ＭＰａで４０×４０×１６０ｍｍの形状に作成した試料
を、１３５０℃、ブリーズ中で還元焼成し、曲げ強度
（ＭＰａ）、見掛気孔率（％）を測定した。Bending strength / apparent porosity: molding pressure 5
A sample prepared in a shape of 40 × 40 × 160 mm in MPa was reduced and fired in a breath at 1350 ° C., and the bending strength (MPa) and apparent porosity (%) were measured.
【００３２】 耐食性：アーク加熱による回転ドラム
法によって侵食試験を行った。銑鉄１Ｋｇと高炉スラグ
０．５Ｋｇを侵食剤として、侵食剤は１時間毎に入れ替
えを行いながら１５５０℃−３時間の侵食試験を行い、
侵食深さを測定した。Corrosion resistance: An erosion test was performed by a rotating drum method using arc heating. Using 1 kg of pig iron and 0.5 kg of blast furnace slag as erosion agents, perform an erosion test at 1550 ° C. for 3 hours while replacing the erosion agents every hour.
The erosion depth was measured.
【００３３】 熱間接着性：図３に示すシミュレーシ
ョン炉（図中１はコークス粒、２は閉塞材試料、３は充
填用ホルダー、４はノズル、５は油圧シリンダー、６は
耐火キャスタブル、７は送風口）を用い、炉内にコーク
ス粒を詰め、炉下部より送風してコークスを燃焼させ、
コークス温度約１２００℃に保った状態において、第１
回目の充填としてノズルより練り土約４Ｋｇを試料ホル
ダーへ充填し、硬化後、ドリルにより２０φの孔を開
け、ついで第２回目の充填として約０．５Ｋｇの練り土
をノズルより試料ホルダーへ充填し、加熱硬化させる。
自然冷却の後、解体し、第１回目及び第２回目の充填試
料の接着状況を調査した。Hot adhesion: simulation furnace shown in FIG. 3 (1 is a coke granule, 2 is a plugging material sample, 3 is a filling holder, 4 is a nozzle, 5 is a hydraulic cylinder, 6 is a refractory castable, 7 is Using a blower port, the furnace is filled with coke particles and blown from the bottom of the furnace to burn coke,
With the coke temperature kept at about 1200 ° C, the first
As the second filling, about 4 kg of the clay is filled into the sample holder from the nozzle, and after curing, a 20φ hole is opened with a drill. Then, as the second filling, about 0.5 kg of the clay is filled into the sample holder from the nozzle. And heat and cure.
After natural cooling, the sample was disassembled, and the adhesion state of the first and second filling samples was examined.
【００３４】 発煙時間：１０００℃保持の電気炉の
中へ、練り土を５ＭＰａで成形した３０φ×３０ｍｍの
供試体を投入し、発煙の終了時間を測定した。Smoke emission time: A 30 mm × 30 mm specimen obtained by shaping the kneaded soil at 5 MPa into an electric furnace maintained at 1000 ° C. was measured for the end time of smoke emission.
【００３５】 熱硬化速度：３００℃に保持した恒温
容器に５０φ×５０ｍｍに成形した練り土を装入し、規
定時間経過後（１０分後、２０分後）取り出して直ちに
圧縮強度（ＭＰａ）を測定した。Thermosetting speed: A 50 ° × 50 mm kneaded soil is charged into a thermostatic container maintained at 300 ° C., and after a specified time has elapsed (after 10 minutes and 20 minutes), the compressive strength (MPa) is immediately measured. It was measured.
【００３６】また、下記表３〜５における 1) の意味
は下記の通りである。The meanings of 1) in the following Tables 3 to 5 are as follows.
【００３７】 ○ ： 材料間の境界で剥離等無く、良く接着してお
り、多少の力を加えても剥がれない強度がある状態 △ ： 見た目には剥離等無く、良く接着しているが、
力を入れると剥がれてしまう状態 × ： 剥離が発生しており、接着強度が殆ど無い状態：: good adhesion without separation or the like at the boundary between the materials, and a state in which there is a strength that does not separate even if some force is applied. Δ: good adhesion without separation or the like in appearance,
A state in which peeling occurs when force is applied. X: A state in which peeling has occurred and there is almost no adhesive strength.
【００３８】[0038]
【表３】 [Table 3]
【００３９】[0039]
【表４】 [Table 4]
【００４０】[0040]
【表５】 [Table 5]
【００４１】本発明品である実施例２、また、比較例２
〜４、比較例８の閉塞材を実炉において使用した。その
結果を下記に示す。Example 2 of the present invention and Comparative Example 2
To 4, and the plugging material of Comparative Example 8 was used in an actual furnace. The results are shown below.
【００４２】 実施例２：発煙３分、平均出銑時間１８０分、深度確
保、（出銑間隔１０分） 比較例２：発煙１０分以上 比較例３：マッドガン内で硬化 比較例４：硬化不充分、発煙１０分以上 比較例８：硬化不充分、発煙１０分以上、平均出銑時間
１５５分 このように、従来品では充填後１０分の開孔では、出銑
開始時の発煙・発塵時間が１０分以上であったのに対
し、当該発明品は同じ充填量で２〜５分と大幅に抑制さ
れた。マッドガン中で材料が硬化する等の間題も起こら
なかった。Example 2: Smoke generation 3 minutes, average tapping time 180 minutes, depth securing, (spinning interval 10 minutes) Comparative example 2: Smoke generation 10 minutes or more Comparative example 3: Curing in mud gun Comparative example 4: Non-curing Comparative example 8: Insufficient curing, smoke generation not less than 10 minutes, average tapping time 155 minutes As described above, in the conventional product, when the hole is opened 10 minutes after filling, the smoke generation and dusting at the start of tapping are performed. While the time was 10 minutes or more, the present invention product was significantly suppressed to 2 to 5 minutes with the same filling amount. No problems occurred while the material hardened in the mud gun.
【００４３】また、出銑時間は連続出銑時の平均が１８
０分と従来品と同等以上であり、同時期にタール系マッ
ド材を使用して行った通常出銑時の出銑時間と同等であ
った。また、従来品では連続出銑時には短くなりがちで
あった出銑口深度についても、十分な深度が確保される
ことが判明した。The average tapping time during continuous tapping is 18
It was 0 minutes, which was equal to or more than that of the conventional product, and was equivalent to the tapping time of normal tapping performed using a tar-based mud material in the same period. In addition, it has been found that the tap hole depth, which tends to be short during continuous tapping in the conventional product, is also sufficient.
【００４４】すなわち、当該発明品用いることにより、
連続出銑時においても通常出銑時と同等の出銑時間と深
度を確保した上で、更に出銑開始時の発煙、発塵を大幅
に抑制し、作業環境を改善することが可能であることが
実証された。That is, by using the invention product,
Even during continuous tapping, while ensuring the same tapping time and depth as during normal tapping, it is possible to significantly reduce smoke and dust generation at the start of tapping, and improve the working environment. This has been proven.
【００４５】[0045]
【発明の効果】本発明の出銑口用閉塞材は、骨材粒度構
成とバインダー構成を特定することにより、適度の熱硬
化特性と優れた熱間接着性及び揮発成分の低減を達成し
たため、小型及び中型高炉のみならず、出銑間隔を長時
間確保することの困難な大型高炉においても、耐用性及
び深度安定性を犠牲にすることなく良好な作業環境を維
持した連続出銑を安定して行うことを可能とするもので
ある。According to the taphole closing material of the present invention, a suitable thermosetting property, excellent hot adhesion and a reduction in volatile components are achieved by specifying the aggregate particle size composition and the binder composition. In small and medium-sized blast furnaces as well as in large blast furnaces where it is difficult to keep the tapping interval for a long time, it is possible to stabilize continuous tapping while maintaining a good working environment without sacrificing durability and depth stability. It is possible to do it.
【図１】 押し出し抵抗圧力を測定するために使用した
ステンレス製試料ホルダーの形状を説明するための図で
ある。FIG. 1 is a diagram for explaining a shape of a stainless steel sample holder used for measuring an extrusion resistance pressure.
【図２】 押し出し抵抗圧力を測定するために使用した
測定装置を説明するための図である。FIG. 2 is a diagram for explaining a measuring device used for measuring an extrusion resistance pressure.
【図３】 熱間接着性を調査するために使用したシミュ
レーション炉を説明するための図である。FIG. 3 is a diagram for explaining a simulation furnace used for investigating hot adhesion.
１はコークス粒、２は閉塞材試料、３は充填用ホルダ
ー、４はノズル、５は油圧シリンダー、６は耐火キャス
タブル、７は送風口、８は試料押し出し用面板、９は試
料ホルダー、１０は台座、１１はシリンダーヘッド1 is a coke grain, 2 is a plugging material sample, 3 is a holder for filling, 4 is a nozzle, 5 is a hydraulic cylinder, 6 is a refractory castable, 7 is an air vent, 8 is a face plate for pushing out a sample, 9 is a sample holder, and 10 is a sample holder. Pedestal, 11 is a cylinder head
───────────────────────────────────────────────────── フロントページの続き (72)発明者 北村 匡譜 岡山県備前市東片上390 (72)発明者 窪田 行利 広島県福山市千田町2913−１ ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masafumi Kitamura 390 Higashikatagami, Bizen City, Okayama Prefecture (72) Inventor Yukitoshi Kubota 2913-1 Sendacho, Fukuyama City, Hiroshima Prefecture
Claims (2)
〜４５重量％、粒径が０．０７５ｍｍ以下である耐火原
料を２５〜４０重量％含有した耐火原料配合物に、レゾ
ール型フェノール樹脂（Ｒ）とノボラック型フェノール
樹脂（Ｎ）と軟化点が２５０〜４００℃のコールタール
ピッチ（Ｃ）とからなり、重量比でＲ／（Ｒ＋Ｎ）＝
０．１５〜０．４０、Ｃ／（Ｒ＋Ｎ＋Ｃ）＝０．１〜
０．３のバインダーを１０〜２０重量％の割合で含有さ
せたことを特徴とする出銑口閉塞材。1. A refractory raw material having a particle size of 1 mm or more
A resol-type phenolic resin (R) and a novolak-type phenolic resin (N) having a softening point of 250 to 45% by weight and a refractory raw material composition containing 25 to 40% by weight of a refractory raw material having a particle size of 0.075 mm or less. ~ 400 ° C coal tar pitch (C), and R / (R + N) =
0.15 to 0.40, C / (R + N + C) = 0.1 to
A tap hole plugging material comprising 0.3 to 10% by weight of a binder of 0.3.
５ｍｍ以下であることを特徴とする請求項１記載の出銑
口閉塞材。2. The coal tar pitch having an average particle size of 0.0
The tap hole closing material according to claim 1, wherein the material is 5 mm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10154142A JPH11349383A (en) | 1998-06-03 | 1998-06-03 | Closing material for molten pig iron tapping port |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10154142A JPH11349383A (en) | 1998-06-03 | 1998-06-03 | Closing material for molten pig iron tapping port |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11349383A true JPH11349383A (en) | 1999-12-21 |
Family
ID=15577806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10154142A Pending JPH11349383A (en) | 1998-06-03 | 1998-06-03 | Closing material for molten pig iron tapping port |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11349383A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103396133A (en) * | 2013-07-30 | 2013-11-20 | 山东圣泉化工股份有限公司 | Phenolic resin composition for stemming, preparation method of composition and stemming |
| JP2018158870A (en) * | 2017-03-23 | 2018-10-11 | 品川リフラクトリーズ株式会社 | Mud material for blocking blast furnace tap pore |
-
1998
- 1998-06-03 JP JP10154142A patent/JPH11349383A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103396133A (en) * | 2013-07-30 | 2013-11-20 | 山东圣泉化工股份有限公司 | Phenolic resin composition for stemming, preparation method of composition and stemming |
| JP2018158870A (en) * | 2017-03-23 | 2018-10-11 | 品川リフラクトリーズ株式会社 | Mud material for blocking blast furnace tap pore |
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