JP2010155764A

JP2010155764A - Unfired brick refractory

Info

Publication number: JP2010155764A
Application number: JP2009000362A
Authority: JP
Inventors: Makio Ishihara; 満喜雄石原; Katsutoshi Sakakidani; 勝利榊谷; Takahiro Hori; 貴宏堀
Original assignee: Showa Kde Co Ltd; Nisshin Steel Co Ltd
Current assignee: Nippon Steel Nisshin Co Ltd; Showa Kde Co Ltd
Priority date: 2009-01-05
Filing date: 2009-01-05
Publication date: 2010-07-15
Anticipated expiration: 2029-01-05
Also published as: JP5366560B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide an unfired brick refractory of which the linear percentage change when heated at 1,400°C for 3 hours is at least 3.5% and which requires the prevention of insertion of a bare metal from a joint between bricks lined in a container for treating a fused metal during the use of the unfired brick refractory which includes the main component comprising pyrophyllite and silicon carbide, both compounded with an ARSC scrap (a used carbonaceous refractory). <P>SOLUTION: The ARSC scrap is crushed to a grain size of 3 mm or smaller and then compounded with an amount of 10-60 mass%, preferably 10-40 mass%, into a virgin raw material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、溶融金属処理用の容器に内張りされていた、アルミナ・ろう石・炭化珪素（以下、炭珪という）・カーボン質使用済み耐火物を原料の一部として用いた不焼成れんが耐火物に関する。 The present invention relates to non-fired brick refractories using alumina, wax stone, silicon carbide (hereinafter referred to as carbonaceous silica), and carbonaceous used refractory as a part of raw material, lined in a container for molten metal treatment. About.

溶融金属処理用の容器に内張りされる耐火物には、アルミナ系、マグネシア系、アルミナ・シリカ系、ジルコン系、マグネシア・カーボン系、アルミナ・炭珪・カーボン系など種々の材質のものがあるが、いずれも使用による損耗が避けられず、規定回数使用されると、張り替えのため解体されている。 Refractories lined in molten metal processing containers include various types of materials such as alumina, magnesia, alumina / silica, zircon, magnesia / carbon, alumina / charcoal / carbon. In both cases, wear due to use is inevitable, and after being used a specified number of times, it has been dismantled for replacement.

解体された耐火物は廃棄処分されるが、近年ではこれを破砕して、そのまま或いは表面改質を行ってから耐火物の原料の一部としてリサイクルする試みが種々なされている。下記特許文献１に示されるものが、その一つの例で、この文献には、アルミナ・カーボン質の使用済み耐火物を３mm以下の粒度に粉砕したのち、これをそのまま４０〜８０質量％配合した不焼成れんが耐火物が開示されている。 Although the dismantled refractory is discarded, in recent years, various attempts have been made to crush it and recycle it as it is or as part of the refractory raw material after surface modification. The following Patent Document 1 is one example. In this document, after the used alumina / carbonaceous refractory is pulverized to a particle size of 3 mm or less, 40-80% by mass of this is blended as it is. Non-fired brick refractories are disclosed.

特開２００５−２８１０３９号公報JP 2005-281039 A

従来のリサイクルは、高価な材料に対して考慮され、ろう石のような安価なものをリサイクルの対象とすることは考えられていなかった。 Conventional recycling has been considered for expensive materials, and it has not been considered to target inexpensive materials such as wax stones.

本発明者らは、廃棄物を減少させ、資源を有効活用するという観点からろう石を主体とする使用済み耐火物を不焼成れんが耐火物の原料として再使用することを意図とし、その配合量について種々検討を重ねた。本発明は、この検討結果に基づいてなされたものである。 The present inventors intend to reuse used refractories mainly composed of wax stone as raw materials for non-fired brick refractories from the viewpoint of reducing waste and effectively utilizing resources. Various investigations were repeated. The present invention has been made based on the results of this study.

請求項１に係わる発明は、ろう石や炭珪を成分の主体とする不焼成れんが耐火物において、アルミナ・ろう石・炭珪・カーボン質使用済み耐火物（以下、ＡＲＳＣ屑という）を３mm下の粒度に粉砕した粉砕物をそのまま原料の一部として１０〜６０質量％配合したことを特徴とする。 The invention according to claim 1 is a non-fired brick refractory mainly composed of wax stone or charcoal, and is 3 mm below alumina, wax stone, charcoal silica, and carbonaceous used refractory (hereinafter referred to as ARSC waste). The pulverized product pulverized to a particle size of 10 to 60% by mass is blended as part of the raw material.

本発明者らは、かねてより、溶融金属処理用の容器に内張りされたれんが間の目地より使用中に地金が差込むのを防止するには、れんがを１４００℃で３時間加熱したときの線変化率が３．５％以上必要であることを経験則上知得していたが、ＡＲＳＣ屑を１０〜６０質量％配合したものは、れんが間の目地より地金が差込むのを防止するための上記条件を満たすことを見出し、本発明を完成するに至ったものである。 In order to prevent the ingot from being inserted during use from the joints between the bricks lined in the molten metal processing container, the present inventors have long used bricks when heated at 1400 ° C. for 3 hours. We knew from experience that the rate of line change is 3.5% or more, but those containing ARSC scraps of 10 to 60% by mass prevent the ingots from being inserted from the joints between the bricks. The present inventors have found that the above conditions for satisfying the above conditions are satisfied, and have completed the present invention.

請求項２に係わる発明は、請求項１に係わる発明のＡＲＳＣ屑の配合量を１０〜４０質量％としたことを特徴とする。 The invention according to claim 2 is characterized in that the blending amount of the ARSC waste of the invention according to claim 1 is 10 to 40% by mass.

本発明によると、バージン原料のみを使用した耐火物と同等以上の耐スポーリング性を有する耐火物を、ＡＲＳＣ屑を使用し得ることができた。 According to the present invention, ARSC waste can be used as a refractory having a spalling resistance equal to or higher than that of a refractory using only a virgin raw material.

実施例及び比較例のれんがの線変化率を示す図。The figure which shows the linear change rate of the brick of an Example and a comparative example. 実施例及び比較例のれんがの耐スポーリング性（崩壊回数）を示すグラフ。The graph which shows the spalling resistance (number of collapses) of the brick of an Example and a comparative example.

溶融金属処理用の容器に内張りされた使用済みれんがを張り替えのため解体したときに発生したアルミナ・ろう石・炭珪・カーボン質耐火物を破砕し、下記表１の粒度のリサイクル材を得た。このリサイクル材の成分は表２に示す通りである。このリサイクル材１０質量％をろう石７０質量％を主成分とするバージン原料に配合し、不焼成れんがを作成した。このれんがの成分はSiO２６３％、Al２O３１６％、SiC１４％であり、見掛気孔率１１．０％、かさ比重２．４５、圧縮強さ３３ＭＰａでＪＩＳＲ２５５４に準拠して求めた、１４００℃で３時間加熱したときの線変化率は４．８２％、１３００℃で３０分間加熱したのち、３０分間の水冷を繰返し、れんがが崩壊するまでの回数（耐スポーリング性）を求めたところ、１６回となった。 Crushing the alumina, wax stone, charcoal silica, and carbonaceous refractories generated when dismantling used bricks lined in a container for molten metal treatment to obtain a recycle material with the particle sizes shown in Table 1 below. . The components of this recycled material are as shown in Table 2. 10% by mass of this recycled material was blended with a virgin raw material containing 70% by mass of a wax stone as a main component to produce an unfired brick. The components of this brick are SiO 263%, Al 2 O 316%, SiC 14%, the apparent porosity is 11.0%, the bulk specific gravity is 2.45, and the compression strength is 33 MPa, which is determined in accordance with JIS R2554 for 3 hours. The linear change rate when heated was 4.82%, after heating at 1300 ° C. for 30 minutes, repeated water cooling for 30 minutes, and the number of times until the brick collapsed (spalling resistance) was determined to be 16 times. became.

実施例１のリサイクル材２０質量％を、ろう石６０質量％を主成分とするバージン原料に配合し、不焼成れんがを作成した。このれんがの成分はSiO２５９％、Al２O３２０％、SiC１４％であり、見掛気孔率１１．１％、かさ比重２．４５、圧縮強さ３２ＭＰａで、実施例１を同様にして求めた線変化率は４．５８％、耐スポーリング性を示すれんがの崩壊回数は１８回であった。 20% by mass of the recycled material of Example 1 was blended with a virgin raw material mainly composed of 60% by mass of a wax stone to produce an unfired brick. The components of this brick are SiO 259%, Al 2 O 320%, SiC 14%, apparent porosity 11.1%, bulk specific gravity 2.45, compression strength 32 MPa, and the linear change rate obtained in the same manner as in Example 1 is The number of times of collapse of the brick showing 4.58% and spalling resistance was 18 times.

実施例１のリサイクル材３０質量％を、ろう石５０質量％を主成分とするバージン原料に配合し、不焼成れんがを作成した。このれんがの成分はSiO２５５％、Al２O３２４％、SiC１４％であり、見掛気孔率１２．４％、かさ比重２．４４、圧縮強さ２８ＭＰａで、実施例１と同様にして求めた線変化率は４．４３％、れんがの崩壊回数は１４回であった。 30% by mass of the recycled material of Example 1 was blended with a virgin raw material mainly composed of 50% by mass of a wax, and an unfired brick was created. The components of this brick are SiO 255%, Al 2 O 324%, SiC 14%, apparent porosity 12.4%, bulk specific gravity 2.44, compressive strength 28 MPa, and the linear change rate obtained in the same manner as in Example 1 is The number of brick collapses was 4.43% and 14 times.

実施例１のリサイクル材４０質量％を、ろう石４０質量％を主成分とするバージン原料に配合し、不焼成れんがを作成した。このれんがの成分はSiO２４９％、Al２O３２８％、SiC１５％であり、見掛気孔率１２．８％、かさ比重２．４３、圧縮強さ２６ＭＰａで、実施例１と同様にして求めた線変化率は４．２７％、れんがの崩壊回数は１４回であった。 40% by mass of the recycled material of Example 1 was blended with a virgin raw material mainly composed of 40% by mass of a wax stone to produce an unfired brick. The components of this brick are SiO249%, Al2O328%, SiC15%, apparent porosity 12.8%, bulk specific gravity 2.43, and compression strength 26 MPa. The linear change rate obtained in the same manner as in Example 1 is The number of brick collapses was 4.27% and 14 times.

実施例１のリサイクル材５０質量％を、ろう石３０質量％を主成分とするバージン原料に配合し、不焼成れんがを作成した。このれんがの成分はSiO２４３％、Al２O３３３％、SiC１５％であり、見掛気孔率１３．３％、かさ比重２．４２、圧縮強さ２２ＭＰａで、実施例１と同様にして求めた線変化率は４．２７％、れんがの崩壊回数は１１回であった。 50% by mass of the recycled material of Example 1 was blended with a virgin raw material whose main component is 30% by mass of a wax stone to produce an unfired brick. The components of this brick were SiO 243%, Al 2 O 33%, SiC 15%, apparent porosity 13.3%, bulk specific gravity 2.42, compressive strength 22 MPa, and the linear change rate obtained in the same manner as in Example 1 was The number of brick collapses was 4.27% and 11 times.

実施例１のリサイクル材６０質量％を、ろう石２０質量％を主成分とするバージン原料に配合し、不焼成れんがを作成した。このれんがの成分はSiO２３８％、Al２O３３７％、SiC１６％であり、見掛気孔率１３．７％、かさ比重２．４２、圧縮強さ２０ＭＰａで、実施例１と同様にして求めた線変化率は４．０４％、れんがの崩壊回数は９回であった。 60% by mass of the recycled material of Example 1 was blended with a virgin raw material whose main component was 20% by mass of a wax stone to produce an unfired brick. The components of this brick are SiO 238%, Al 2 O 337%, SiC 16%, apparent porosity 13.7%, bulk specific gravity 2.42, compressive strength 20 MPa, and the linear change rate obtained in the same manner as in Example 1 is The number of brick collapses was 4.04% and 9 times.

比較例１
実施例１のリサイクル材７０質量％を、ろう石１０質量％を主成分とするバージン原料に配合し、不焼成れんがを作成した。このれんがの成分はSiO_２３３％、Al_２O_３４１％、SiC１６％であり、見掛気孔率１４．２％、かさ比重２．４１、圧縮強さ１９ＭＰａで、実施例１と同様にして求めた線変化率は３．２６％、れんがの崩壊回数は９回であった。 Comparative Example 1
70% by mass of the recycled material of Example 1 was blended with a virgin raw material whose main component was 10% by mass of a wax, to produce an unfired brick. The components of this brick _{_{SiO 2 33%, Al 2 O}} 3 41%, is SiC16% apparent porosity 14.2%, bulk density 2.41, with compressive strength 19 MPa, in the same manner as in Example 1 The calculated linear change rate was 3.26%, and the number of brick collapses was 9.

比較例２
実施例１のリサイクル材８０質量％をろう石を含まないバージン原料に配合し、不焼成れんがを作成した。このれんがの成分はSiO_２２７％、Al_２O_３４６％、SiC１７％であり、見掛気孔率１４．６％、かさ比重２．４２、圧縮強さ１８ＭＰａで、実施例１と同様にして求めた線変化率は２．９６％、れんがの崩壊回は８回であった。 Comparative Example 2
80% by mass of the recycled material of Example 1 was blended with a virgin raw material that does not contain a wax, to produce an unfired brick. The components of this brick are SiO ₂ 27%, Al ₂ O ₃ 46%, SiC 17%, apparent porosity 14.6%, bulk specific gravity 2.42 and compressive strength 18 MPa. The calculated linear change rate was 2.96%, and the number of brick collapses was 8.

比較例３（従来例）
ろう石８０質量％を主成分とするバージン原料にて不焼成れんがを作成した。このれんがの成分はSiO_２６８％、Al_２O_３１１％、SiC１７％であり、見掛気孔率１２．０％、かさ比重２．４２、圧縮強さ３４ＭＰａで、実施例１と同様にして求めた線変化率は４．８２％、れんがの崩壊回数は１４回であった。
以上の結果を表３に示す。図１は線変化率、図２は耐スポーリング性（崩壊回数）を示す図である。 Comparative example 3 (conventional example)
Unfired brick was made of a virgin raw material mainly composed of 80% by weight of a wax. The components of this brick are 68% SiO ₂ , 11% Al ₂ O ₃ and 17% SiC, with an apparent porosity of 12.0%, bulk specific gravity of 2.42 and compressive strength of 34 MPa, as in Example 1. The obtained linear change rate was 4.82%, and the number of brick collapses was 14.
The results are shown in Table 3. FIG. 1 is a graph showing the linear change rate, and FIG. 2 is a diagram showing the spalling resistance (the number of collapses).

前述したように、溶融金属処理用の容器に内張りされたれんが間の目地より使用中に地金が差込むのを防止するためには、れんがの線変化率は３．５％以上必要であるが、図１に示すように実施例１〜６のれんがはいずれもこの条件を満たした。また実施例１〜４のれんがは崩壊回数が比較例３のバージン原料のみで作成したれんがと同等以上であり、とくに実施例１及び２のれんがは、比較例３のれんがよりも崩壊に至るまでの回数が増加し、耐スポーリング性が向上した。 As described above, the linear change rate of brick is required to be 3.5% or more in order to prevent the ingot from being inserted during use from the joint between the bricks lined in the container for treating the molten metal. However, as shown in FIG. 1, the bricks of Examples 1 to 6 all satisfied this condition. In addition, the bricks of Examples 1 to 4 have the number of collapses equal to or greater than that of the bricks made only from the virgin raw material of Comparative Example 3, and in particular, the bricks of Examples 1 and 2 until the brick of Comparative Example 3 collapses more. The number of times increased and spalling resistance improved.

Claims

ろう石や炭化珪素を成分の主体とする不焼成れんが耐火物において、アルミナ・ろう石・炭化珪素・カーボン質使用済み耐火物を３mm以下の粒度に粉砕した粉砕物をそのまま原料の一部として１０〜６０質量％配合したことを特徴とする不焼成れんが耐火物。 A non-fired brick refractory mainly composed of wax or silicon carbide, and a pulverized product obtained by pulverizing alumina, wax, silicon carbide, or carbonaceous used refractory to a particle size of 3 mm or less is used as part of the raw material. Unfired brick refractory characterized by blending ~ 60 mass%.

前記アルミナ・ろう石・炭化珪素・カーボン質使用済み耐火物の配合量を１０〜４０質量％としたことを特徴とする請求項１記載の不焼成れんが耐火物。 The unfired brick refractory according to claim 1, wherein a blending amount of the alumina, wax, silicon carbide, and carbonaceous used refractory is 10 to 40% by mass.