JPH0131474B2 - - Google Patents
Info
- Publication number
- JPH0131474B2 JPH0131474B2 JP12989284A JP12989284A JPH0131474B2 JP H0131474 B2 JPH0131474 B2 JP H0131474B2 JP 12989284 A JP12989284 A JP 12989284A JP 12989284 A JP12989284 A JP 12989284A JP H0131474 B2 JPH0131474 B2 JP H0131474B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- refractory
- alumina cement
- parts
- present
- 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.)
- Expired
Links
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 26
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 18
- -1 amine silicate Chemical class 0.000 claims description 18
- 239000004568 cement Substances 0.000 claims description 18
- 239000000377 silicon dioxide Substances 0.000 claims description 13
- 235000013312 flour Nutrition 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 238000009472 formulation Methods 0.000 claims description 6
- 239000011819 refractory material Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 239000011550 stock solution Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910017082 Fe-Si Inorganic materials 0.000 description 1
- 229910017133 Fe—Si Inorganic materials 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Ceramic Products (AREA)
Description
産業上の利用分野
本発明は、高強度を有しかつ取り扱いが容易な
キヤスタブル耐火物に関する。
従来の技術及び問題点
結合剤としてアルミナセメントとシリカフラワ
ーとを併用する高強度キヤスタブル耐火物は公知
である（特開昭57−172181号公報）。この耐火物
は、アルミナセメントとシリカフラワーとの水熱
反応による硬化及びシリカフラワーの凝集力によ
り高強度を発現する。しかし、この耐火物で使用
するシリカフラワーは、Fe−Si製造時の副産物
として得られるものであり、入荷ロツトによつて
不純物の量が変化し、かつ純度そのものも約90％
と低い。このため、シリカフラワーを大量に使用
すると耐火物の低下をもたらし、かつ水と混練し
た耐火物の流動性や硬化時間にばらつきを生じ
る。
また、シリカフラワーの代りにシリカゾルを使
用する高強度耐火物も知られている（特開昭54−
18820号公報）。しかしシリカゾルはPHの変動に非
常に敏感であり、アルミナセメントとの併用ある
いはその他の電解質の存在下においては、混練中
に凝結を始めるなどの現象が見られ非常にとり扱
い難い。
問題点を解決するための手段
本発明者は、このような現状に鑑みて種々研究
を重ねた結果、アルミナセメントとアミンシリケ
ートとを結合剤として併用することにより、前記
のような欠点を生じることなく、高強度を有する
キヤスタブル耐火物が得られることを見出しここ
に本発明を完成した。
即ち、本発明は、アルミナセメント２〜10重量
％を含有する耐火物配合物100重量部とアミンシ
リケート0.25〜２重量部とからなることを特徴と
するキヤスタブル耐火物、並びにアルミナセメン
ト２〜10重量％及びシリカフラワー0.5〜10重量
％を含有する耐火物配合物100重量部とアミンシ
リケート0.25〜２重量部とからなることを特徴と
するキヤスタブル耐火物に係るものである。
本発明に於いて耐火物配合物とは、耐火骨材及
びアルミナセメントあるいは更にシリカフラワー
からなるものである。耐火骨材としては、通常の
キヤスタブル耐火物に使用する耐火骨材から目的
に応じて適宜選択でき、例えばアルミナ、ボーキ
サイト、ムライト、シヤモツト、ろう石、珪石、
ジルコン、ジルコニアなどが挙げられ、その他マ
グネシア、クロム鉄鉱などの塩基性材料も使用で
きる。
本発明に於いて結合剤として使用するアルミナ
セメントは、特に制限はなく、通常市販されてい
るスーパー級（Al2O380％、CaO18％）ハイアル
ミナ級（Al2O373％、CaO25％）、１号２号セメ
ント（Al2O363〜52％、CaO35〜45％）などが使
用できる。アルミナセメントの使用量は、耐火物
配合物中２〜10重量％の範囲が適当である。２重
量％未満では硬化が遅く、強度の発現も不充分で
あり、10重量％を越えると、耐火性の低下、容積
安定性の低下があり、また急熱した場合に爆裂の
危険性がある。
本発明では、シリカフラワーを添加することに
より、強度及び流動性が更に一層改善される。シ
リカフラワーの添加量は、耐火物配合物中0.5〜
10重量％程度であり、好ましくは１〜７重量％程
度である。シリカフラワーの添加量が10重量％を
越えると耐火性の低下、キヤスタブルの収縮の増
大が見られ不適当である。
本発明で使用するアミンシリケートとは、コロ
イドケイ酸NaO・3SiO2・3H2OのNaを中性のア
ルキル基を有するアミンNH2CnH2nにより置換
したものである。このアミンシリケートは、PH変
動に対して安定なため、キヤスタブル耐火物を混
練する場合に耐火物が急速に硬化することなく取
り扱いが容易である。本発明では、コロイドケイ
酸とアミンとを反応させて得られる約35〜40％水
溶液の形態のアミンシリケート（アミンシリケー
ト原液）を耐火物配合物100重量部に対してアミ
ンシリケートとして0.25〜２重量部の割合で使用
する。アミンシリケートの添加量が0.25重量部よ
り少ないとキヤスタブル耐火物の硬化が早く、か
つ十分な強度が得られず、２重量部を越えると硬
化が非常に遅くなり、また収縮が大きくなるた
め、耐火物としては不適当である。アミンシリケ
ート原液は、高粘性のため、通常は水で希釈して
使用することが望ましい。アミンシリケート原液
は、水と任意の割合で混合可能であり、通常アミ
ンシリケート原液の３〜10倍量の水を加えて混合
し使用する。
本発明のキヤスタブル耐火物は、施工に先立ち
前記した耐火物配合物にアミンシリケート希釈液
を加え混練した後、使用する。
本発明では耐火骨材としてマグネシア、クロム
鉄鉱などの塩基性材料を使用する場合にはキヤス
タブル耐火物の硬化が若干早くなるので、アルミ
ナセメントは耐火物配合物中２〜５重量％程度、
アミンシリケートは耐火物配合物100重量部に対
して１〜２重量部程度とすることが好ましい。
また本発明では、界面活性剤、分散剤、湿潤剤
などをアルミナセメントの自硬性を害さない範囲
で添加することも可能である。
発明の効果
本発明キヤスタブル耐火物は、高強度を有し、
体積安定性に優れた高耐火性配合物である。更
に、本発明耐火物は、適度な硬化時間を有し、取
り扱いが容易である。
実施例
次に実施例を挙げて本発明を更に詳しく説明す
る
実施例 １〜４
第１表に示す耐火物配合物を作り、アミンシリ
ケート原液に水を加えたアミンシリケート希釈液
を添加し、混練後、40×40×160mmの金型に流し
込み、室温で１日間養生後、110℃で24時間乾燥
した。これを900℃と1500℃で焼成し、その後第
２表に示す各物性値を測定した。線変化率はJIS
−Ｒ−2554、気孔率はJIS−Ｒ−2205、圧縮強さ
と曲げ強さはJIS−Ｒ−2553に準じて測定した。
INDUSTRIAL APPLICATION FIELD The present invention relates to castable refractories that have high strength and are easy to handle. Prior Art and Problems A high-strength castable refractory using a combination of alumina cement and silica flour as a binder is known (Japanese Unexamined Patent Publication No. 172181/1981). This refractory exhibits high strength due to hardening due to the hydrothermal reaction between alumina cement and silica flour and the cohesive force of silica flour. However, the silica flour used in this refractory is obtained as a by-product during Fe-Si production, and the amount of impurities varies depending on the incoming lot, and the purity itself is approximately 90%.
and low. For this reason, when a large amount of silica flour is used, the refractory quality deteriorates, and the fluidity and curing time of the refractory mixed with water vary. Furthermore, high-strength refractories using silica sol instead of silica flour are also known (Japanese Unexamined Patent Publication No. 54-118)
Publication No. 18820). However, silica sol is very sensitive to pH fluctuations, and when used in combination with alumina cement or in the presence of other electrolytes, phenomena such as beginning to coagulate during kneading are observed, making it extremely difficult to handle. Means for Solving the Problems In view of the current situation, the present inventor has conducted various studies and found that the above-mentioned drawbacks do not occur when alumina cement and amine silicate are used together as a binder. The present invention was completed based on the discovery that a castable refractory having high strength can be obtained without the need for the above methods. That is, the present invention provides a castable refractory comprising 100 parts by weight of a refractory composition containing 2 to 10% by weight of alumina cement and 0.25 to 2 parts by weight of an amine silicate, and 2 to 10 parts by weight of alumina cement. % and 100 parts by weight of a refractory formulation containing 0.5-10% by weight of silica flour and 0.25-2 parts by weight of an amine silicate. In the present invention, the refractory composition is composed of refractory aggregate and alumina cement or silica flour. The refractory aggregate can be appropriately selected depending on the purpose from the refractory aggregates used for ordinary castable refractories, such as alumina, bauxite, mullite, siyamoto, waxite, silica,
Examples include zircon and zirconia, and other basic materials such as magnesia and chromite can also be used. The alumina cement used as a binder in the present invention is not particularly limited, and commercially available super grade (Al 2 O 3 80%, CaO 18%) high alumina cement (Al 2 O 3 73%, CaO 25%) can be used. ), No. 1 No. 2 cement (Al 2 O 3 63-52%, CaO 35-45%), etc. can be used. The amount of alumina cement used is suitably in the range of 2 to 10% by weight in the refractory formulation. If it is less than 2% by weight, curing will be slow and the development of strength will be insufficient; if it exceeds 10% by weight, there will be a decrease in fire resistance and volume stability, and there is a risk of explosion if heated rapidly. . In the present invention, strength and fluidity are further improved by adding silica flour. The amount of silica flour added is from 0.5 to 0.5 in the refractory formulation.
The amount is about 10% by weight, preferably about 1 to 7% by weight. If the amount of silica flour added exceeds 10% by weight, the fire resistance will decrease and the shrinkage of the castable will increase, which is inappropriate. The amine silicate used in the present invention is a colloidal silicate NaO.3SiO 2 .3H 2 O in which Na is replaced by an amine NH 2 CnH 2 n having a neutral alkyl group. This amine silicate is stable against pH fluctuations, so when kneading castable refractories, the refractories do not harden rapidly and are easy to handle. In the present invention, an amine silicate (amine silicate stock solution) in the form of an approximately 35-40% aqueous solution obtained by reacting colloidal silicic acid with an amine is used in an amount of 0.25-2 weight parts as amine silicate per 100 parts by weight of the refractory formulation. Use in proportion. If the amount of amine silicate added is less than 0.25 parts by weight, the castable refractory will harden quickly and sufficient strength will not be obtained, while if it exceeds 2 parts by weight, curing will be very slow and shrinkage will increase, resulting in poor refractory properties. It is inappropriate as a thing. Since the amine silicate stock solution has a high viscosity, it is usually desirable to dilute it with water before use. The amine silicate stock solution can be mixed with water in any proportion, and is usually used by adding 3 to 10 times the amount of water to the amine silicate stock solution. The castable refractory of the present invention is used after adding and kneading the amine silicate diluted solution to the refractory composition described above prior to construction. In the present invention, when a basic material such as magnesia or chromite is used as a refractory aggregate, the hardening of the castable refractory will be slightly faster, so the alumina cement should be used in an amount of about 2 to 5% by weight in the refractory mixture.
The amount of amine silicate is preferably about 1 to 2 parts by weight per 100 parts by weight of the refractory composition. Further, in the present invention, it is also possible to add surfactants, dispersants, wetting agents, etc. within a range that does not impair the self-hardening properties of the alumina cement. Effect of the invention The castable refractory of the present invention has high strength,
It is a highly refractory compound with excellent volumetric stability. Furthermore, the refractory of the present invention has an appropriate curing time and is easy to handle. Examples Examples 1 to 4 The present invention will be explained in more detail with reference to examples. Thereafter, it was poured into a mold of 40 x 40 x 160 mm, cured at room temperature for 1 day, and then dried at 110°C for 24 hours. This was fired at 900°C and 1500°C, and then the physical property values shown in Table 2 were measured. Line change rate is JIS
-R-2554, porosity was measured according to JIS-R-2205, and compressive strength and bending strength were measured according to JIS-R-2553.
【表】【table】
【表】
比較例 １〜４
第３表に示す組成の耐火物を実施例１〜４と同
様にして作り、各物性値を測定した。結果を第４
表に示す。物性値の測定方法は実施例１〜４と同
様である。[Table] Comparative Examples 1 to 4 Refractories having the compositions shown in Table 3 were made in the same manner as Examples 1 to 4, and their physical property values were measured. 4th result
Shown in the table. The method for measuring physical property values is the same as in Examples 1-4.
【表】【table】
【表】
第２表から、本発明耐火物は、適度の硬化時間
及び高強度を有し、かつ焼成した場合にも大きな
収縮をしないことが明らかである。これと比較し
て比較例１は、アルミナセメントの使用量が少な
いため、硬化時間が長く、かつ強度が不足する。
比較例２は、アルミナセメントの使用量が多いた
め、硬化時間が短かく、かつ焼成した場合に収縮
する。比較例３は、アミンシリケートの使用量が
多いため、硬化時間が長く、焼成した場合に収縮
する。比較例４は、アミンシリケートを使用しな
い場合であり、アルミナセメント使用量が多いた
め高強度であるが、焼成した時に大きく収縮し、
体積安定性が悪い。[Table] From Table 2, it is clear that the refractories of the present invention have an appropriate curing time and high strength, and do not undergo large shrinkage even when fired. In comparison, in Comparative Example 1, the amount of alumina cement used was small, so the curing time was long and the strength was insufficient.
In Comparative Example 2, since a large amount of alumina cement was used, the curing time was short and the product shrank when fired. Comparative Example 3 uses a large amount of amine silicate, so it takes a long time to cure and shrinks when fired. Comparative Example 4 is a case where no amine silicate is used, and it has high strength due to the large amount of alumina cement used, but it shrinks greatly when fired,
Poor volume stability.
Claims (1)
る耐火物配合物100重量部とアミンシリケート
0.25〜２重量部とからなることを特徴とするキ
ヤスタブル耐火物。 アルミナセメント２〜10重量％及びシリカフ
ラワー0.5〜10重量％を含有する耐火物配合物
100重量部とアミンシリケート0.25〜２重量部
とからなることを特徴とするキヤスタブル耐火
物。[Claims] 1. 100 parts by weight of a refractory formulation containing 2-10% by weight of alumina cement and an amine silicate.
A castable refractory comprising 0.25 to 2 parts by weight. Refractory formulation containing 2-10% by weight of alumina cement and 0.5-10% by weight of silica flour
A castable refractory comprising 100 parts by weight and 0.25 to 2 parts by weight of an amine silicate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12989284A JPS6110076A (en) | 1984-06-22 | 1984-06-22 | Castable refractories |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12989284A JPS6110076A (en) | 1984-06-22 | 1984-06-22 | Castable refractories |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6110076A JPS6110076A (en) | 1986-01-17 |
| JPH0131474B2 true JPH0131474B2 (en) | 1989-06-26 |
Family
ID=15020936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12989284A Granted JPS6110076A (en) | 1984-06-22 | 1984-06-22 | Castable refractories |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6110076A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0788260B2 (en) * | 1986-10-13 | 1995-09-27 | 川崎炉材株式会社 | Castable refractory |
-
1984
- 1984-06-22 JP JP12989284A patent/JPS6110076A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6110076A (en) | 1986-01-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |