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JP2007284330A - Calcia clinker excellent in hydration resistance - Google Patents

Calcia clinker excellent in hydration resistance Download PDF

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Publication number
JP2007284330A
JP2007284330A JP2006139514A JP2006139514A JP2007284330A JP 2007284330 A JP2007284330 A JP 2007284330A JP 2006139514 A JP2006139514 A JP 2006139514A JP 2006139514 A JP2006139514 A JP 2006139514A JP 2007284330 A JP2007284330 A JP 2007284330A
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Japan
Prior art keywords
cao
clinker
hydration
calcia
mol
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Pending
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JP2006139514A
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Japanese (ja)
Inventor
Uei Hayashi
▲ウェイ▼ 林
Akira Yamaguchi
明良 山口
Junji Onmiyouji
準治 隠明寺
Yasuo Mizota
恭夫 溝田
Eiji Iida
栄司 飯田
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OKAYAMA CERAMICS GIJUTSU SHINK
Shinagawa Refractories Co Ltd
Okayama Ceramics Research Foundation
Original Assignee
OKAYAMA CERAMICS GIJUTSU SHINK
Shinagawa Refractories Co Ltd
Okayama Ceramics Research Foundation
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Application filed by OKAYAMA CERAMICS GIJUTSU SHINK, Shinagawa Refractories Co Ltd, Okayama Ceramics Research Foundation filed Critical OKAYAMA CERAMICS GIJUTSU SHINK
Priority to JP2006139514A priority Critical patent/JP2007284330A/en
Publication of JP2007284330A publication Critical patent/JP2007284330A/en
Pending legal-status Critical Current

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  • Compositions Of Oxide Ceramics (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide calcia clinker excellent in hydration resistance. <P>SOLUTION: The calcia clinker is characterized by containing nickel oxide and having a nickel oxide content of 3-35 mol%, favorably 5-20 mol%. For example, the powders of calcium carbonate, nickel oxide and other oxides are mixed at a specified ratio and formed at 50 MPa and then obtained formed body is fired at 1,600°C for 5 hours in the atmosphere. The calcia clinker has excellent hydration resistance and maintains the characteristics of CaO. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、耐火物に用いられる耐水和性に優れたカルシア質クリンカーに関する。  The present invention relates to a calcia clinker excellent in hydration resistance used for refractories.

カルシア(CaO)は耐火度が高く、また塩基性溶融スラグなどの溶融物に対する耐食性も良いなどの優れた特性を有するため、製鋼用耐火物やセメント製造用耐火物などの耐火物の製造分野に原料として使用することができる。しかし、CaOは、水との反応に起因して水和が起こりやすいため、応用上では取り扱いが困難であるという大きな欠点がある。  Calcia (CaO) has high fire resistance and has excellent properties such as good corrosion resistance against melts such as basic molten slag, so it can be used in the field of manufacturing refractories such as refractories for steelmaking and refractories for cement production. Can be used as a raw material. However, CaO has a major drawback in that it is difficult to handle in application because hydration is likely to occur due to reaction with water.

CaOの水和を抑制するため、従来からいくつかの検討がなされている。例えば、MgOを30重量%以上、Feを0.2〜5重量%およびTiOを0.5〜3重量%含有するカルシア系クリンカーが、特開平5−294713に開示されている。In order to suppress the hydration of CaO, several studies have been made conventionally. For example, a calcia-based clinker containing 30% by weight or more of MgO, 0.2 to 5% by weight of Fe 2 O 3 and 0.5 to 3% by weight of TiO 2 is disclosed in JP-A-5-294713.

また、ZrOを1重量%以上、TiOを5重量%以上含むカルシア質耐火材料が、特開平8−165170に開示されている。更に、石灰石にSiO、TiO、ZrO、Al、Fe、CaF、MgFの単体もしくは2種類以上の混合物、化合物を0.05〜5重量5に添加し、1500℃以上で焼成するカルシアクリンカーが、特開平6−1654に開示されている。JP-A-8-165170 discloses a calcia refractory material containing 1% by weight or more of ZrO 2 and 5% by weight or more of TiO 2 . Furthermore, limestone SiO 2, TiO 2, ZrO 2 , Al 2 O 3, Fe 2 O 3, CaF 2, MgF 2 unitary or two or more mixture was added the compound to 0.05 to 5 weight 5, Japanese Patent Laid-Open No. 6-1654 discloses a calcia clinker that is fired at 1500 ° C. or higher.

しかしながら、CaO水和抑制のための検討が行われているものの、その問題が未だ解決されておらず、CaOの耐火原料としての工業的利用が制限されている。  However, although studies for suppressing CaO hydration have been made, the problem has not been solved yet, and industrial use of CaO as a refractory raw material is limited.

本発明は、耐水和性に優れたカルシア質耐火原料を提供することを目的としている。  An object of the present invention is to provide a calcia refractory raw material excellent in hydration resistance.

そして、本発明は、上記目的を達成するため、CaOに酸化ニッケル(NiO)を含有させることを特徴とする。  In order to achieve the above object, the present invention is characterized in that CaO contains nickel oxide (NiO).

また、そのNiO含有量が3〜35モル%であることを特徴とする。  Moreover, the NiO content is 3 to 35 mol%.

酸化ニッケルを含有していることを特徴とし、更に酸化ニッケルの含有量が3〜35モル%であることを特徴とする本発明のカルシア質クリンカーは、優れた耐水和性を持ち、且つCaOの特性を維持するものである。  The calcia clinker of the present invention is characterized by containing nickel oxide and further having a nickel oxide content of 3 to 35 mol%, and has excellent hydration resistance and CaO. Maintains the characteristics.

通常、CaOは空気中に放置されると、CaO(固体)+HO(気、液体)=Ca(OH)(固体)の反応式に従って大気中の水と反応して、水酸化カルシム[Ca(OH)]に変わり水和する。Normally, when CaO is left in the air, it reacts with water in the atmosphere according to the reaction formula of CaO (solid) + H 2 O (gas, liquid) = Ca (OH) 2 (solid), and calcium hydroxide [ It changes to Ca (OH) 2 ] and hydrates.

CaOの水和防止に適した添加物を見出すため、本発明者らは、CaOに種々の物質を添加し焼成することによりクリンカーを作製し、クリンカーの水和率を評価した。その結果、CaOの水和防止に対してNiOの添加効果が大きいことが判明した。  In order to find an additive suitable for preventing the hydration of CaO, the present inventors prepared clinker by adding various substances to CaO and baking, and evaluated the hydration rate of the clinker. As a result, it was found that the effect of adding NiO was great for preventing hydration of CaO.

また、NiOの添加量が35モル%までは、CaO耐水和性の効果度合いが最も大きいこともわかった。CaO−NiO焼結体の微組織を電子顕微鏡にて調べた結果、CaO結晶粒の中にサイズが0.3ミクロン以下の微細なNiO粒が数多く均一に分散していることがわかった。これらの微細NiO粒は、高温下ではCaO結晶粒に固溶していたNiが冷却過程中にCaO結晶粒からNiOとして析出することにより生成したものである。それらは、水のCaO内部への拡散を大いに阻害するため、CaOの耐水和性を顕著に向上させた。  It was also found that the effect of CaO hydration resistance was the greatest when the amount of NiO added was 35 mol%. As a result of examining the microstructure of the CaO—NiO sintered body with an electron microscope, it was found that many fine NiO grains having a size of 0.3 μm or less were uniformly dispersed in the CaO crystal grains. These fine NiO grains are produced by precipitation of Ni, which was dissolved in CaO crystal grains at a high temperature, from the CaO crystal grains as NiO during the cooling process. They greatly inhibited the diffusion of water into CaO, thus significantly improving the hydration resistance of CaO.

以上の研究結果を基に、本発明者らは、本発明のカルシア質クリンカー、すなわち、NiOを含むカルシア質クリンカーを発明した。NiO含有量が3〜35モル%であることが良い。より望ましいのは5〜20モル%である。NiOが3未満であると、CaO質クリンカーの耐水和性が不十分であり、NiOが35モル%を超えて更に増えると、耐水和性の向上が比較的小さくなり、また耐火原料としてのCaOの特性も悪くなる恐れがある。  Based on the above research results, the present inventors invented the calcia clinker of the present invention, that is, the calcia clinker containing NiO. The NiO content is preferably 3 to 35 mol%. More desirable is 5 to 20 mol%. When NiO is less than 3, the hydration resistance of the CaO clinker is insufficient, and when NiO exceeds 35 mol%, the improvement in hydration resistance becomes relatively small, and CaO as a refractory raw material There is also a risk that the characteristics will deteriorate.

本発明のカルシア質クリンカーの製造において、加熱前の出発原料としては、炭酸カルシウム(CaCO)やCa(OH)のようなCa含有物質および酸化ニッケルや水酸化ニッケルのようなNi含有物質を使うことができる。加熱方法としては、電気抵抗炉にて1000〜1800℃の温度で混合物を焼成し、その後固相あるいは半固相のままで冷却させる焼結法を用いることができる。また、アーク炉のような電気炉で一旦高温で混合物を溶融し、その後溶融物を冷却させる電融法を用いることもできる。In the production of the calcia clinker of the present invention, as a starting material before heating, a Ca-containing substance such as calcium carbonate (CaCO 3 ) or Ca (OH) 2 and a Ni-containing substance such as nickel oxide or nickel hydroxide are used. Can be used. As a heating method, it is possible to use a sintering method in which the mixture is fired at a temperature of 1000 to 1800 ° C. in an electric resistance furnace and then cooled in a solid phase or a semi-solid phase. It is also possible to use an electrofusion method in which the mixture is once melted at a high temperature in an electric furnace such as an arc furnace, and then the melt is cooled.

また、加熱する前に、混合物を予め加圧成形し、成形体にした後焼成することができるし、混合物の粉体をそのまま焼成に用いることもできる。  Further, before heating, the mixture can be pressure-molded in advance and formed into a molded body and then fired, or the powder of the mixture can be used as it is for firing.

一方、本発明のカルシア質クリンカーはNiO以外に、その他の成分、例えば、鉄、マンガン、チタン、ジルコニウム、シリコン、クロム、アルミニウムやホウ素などの元素を含む化合物を含有することができる。但し、これら成分の含有量は10モル%以下であり、望ましいのは5モル%以下である。その含有量が10モル%を超えると、クリンカーの耐水和性や耐火原料としての高温特性が悪化する場合がある。  On the other hand, the calcia clinker of the present invention can contain compounds other than NiO, for example, compounds containing elements such as iron, manganese, titanium, zirconium, silicon, chromium, aluminum and boron. However, the content of these components is 10 mol% or less, and desirably 5 mol% or less. When the content exceeds 10 mol%, the hydration resistance of the clinker and the high temperature characteristics as a refractory raw material may be deteriorated.

以下、本発明のいくつかの実施例を説明する。
炭酸カルシウム、酸化ニッケルおよびその他の酸化物のパウダーを出発原料とし、所定の比率で混合した後、50MPaで成形し、成形体を大気中の1600℃で5時間焼成した。また、比較のため、同様な条件でNiOを含有せず、MgOまたはAlを含有するカルシア質クリンカーを作製した。得られたクリンカーは、いずれも見掛け気孔率が1%以下で緻密なものである。
Several embodiments of the present invention will be described below.
Calcium carbonate, nickel oxide and other oxide powders were used as starting materials, mixed at a predetermined ratio, molded at 50 MPa, and the molded body was fired at 1600 ° C. in the atmosphere for 5 hours. For comparison, calcia clinker containing NiO and containing MgO or Al 2 O 3 under the same conditions was prepared. The obtained clinker is dense with an apparent porosity of 1% or less.

また、各クリンカーを、温度70℃、湿度90%に設定している恒温恒湿器に48時間放置し、水和評価実験を行った。水和実験前後の各クリンカーの質量変化(△M)を測定し、f=(△M/M)×100%の式にしたがって、クリンカーの水和率(f)を求めた。式中のMは、水和実験前の各クリンカー中のCaO質量である。さらに、ほかの成分を含有していないCaO単体クリンカーの水和率を1として、(焼結体の水和率÷CaO単体クリンカーの水和率)を各クリンカーの水和指数とした。水和指数が小さいほど、クリンカーが水和し難くなり、本発明のカルシア質クリンカーのほうが比較品より優れた耐水和性を有することが明らかである。In addition, each clinker was left in a thermo-hygrostat set to a temperature of 70 ° C. and a humidity of 90% for 48 hours to conduct a hydration evaluation experiment. The mass change (ΔM) of each clinker before and after the hydration experiment was measured, and the hydration rate (f) of the clinker was determined according to the formula f = (ΔM / M 0 ) × 100%. M 0 in the formula is the mass of CaO in each clinker before the hydration experiment. Furthermore, the hydration rate of the CaO simple substance clinker which does not contain other components was set to 1, and (hydration rate of the sintered body ÷ hydration rate of the CaO simple substance clinker) was defined as the hydration index of each clinker. It is clear that the smaller the hydration index, the harder the clinker hydrates, and the calcia clinker of the present invention has better hydration resistance than the comparative product.

NiOを含有するCaO質クリンカーの微組織写真    Microstructure picture of CaO clinker containing NiO 各クリンカーの化学成分および水和指数表    Chemical components and hydration index table for each clinker

符号の説明Explanation of symbols

Claims (2)

酸化ニッケルを含有していることを特徴とするカルシア質クリンカー。  A calcia clinker characterized by containing nickel oxide. 酸化ニッケルの含有量が3〜35モル%であることを特徴とする請求項1に記載されたカルシア質クリンカー。  The calcia clinker according to claim 1, wherein the content of nickel oxide is 3 to 35 mol%.
JP2006139514A 2006-04-18 2006-04-18 Calcia clinker excellent in hydration resistance Pending JP2007284330A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108383533A (en) * 2018-03-01 2018-08-10 武汉科技大学 A kind of hydration resistant calcia material and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108383533A (en) * 2018-03-01 2018-08-10 武汉科技大学 A kind of hydration resistant calcia material and preparation method thereof

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