JP4474658B2 - Alumina-magnesia refractory brick - Google Patents
Alumina-magnesia refractory brick Download PDFInfo
- Publication number
- JP4474658B2 JP4474658B2 JP37597299A JP37597299A JP4474658B2 JP 4474658 B2 JP4474658 B2 JP 4474658B2 JP 37597299 A JP37597299 A JP 37597299A JP 37597299 A JP37597299 A JP 37597299A JP 4474658 B2 JP4474658 B2 JP 4474658B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- magnesia
- refractory brick
- alumina
- corrosion resistance
- 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 - Lifetime
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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
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Description
【０００１】
【産業上の利用分野】
本発明は、ごみ溶融炉の内張りに使用される耐火れんがに関するものである。
【０００２】
【従来の技術】
従来ごみ溶融炉の内張りに使用される耐火物として、溶融スラグに対する耐食性に優れる酸化クロム含有耐火物が用いられてきた。
【０００３】
しかしクロムは原子価が変動しやすい成分であり、アルカリ塩が存在する雰囲気では容易に有害な六価クロムになることが知られている。環境問題の観点から、酸化クロムを含有しない、溶融スラグに対する耐食性の優れた耐火物の開発が要求されている。
【発明が解決しようとする課題】
【０００４】
酸化クロムを含有しない耐火物として、炭化珪素質耐火物が用いられているが、炭化珪素は雰囲気の影響を受けやすい成分であり、安定した耐用は得られていない。
【０００５】
そこで、本発明においては、塩基性スラグに対する耐食性に優れたアルミナ−マグネシア質耐火れんがを緻密化させることにより、溶融スラグに対する耐食性を向上させごみ溶融炉の内張りれんがを提供することを目的とする。
【０００６】
【課題を解決するための手段】
上記目的を達成するために本発明においては、スピネルクリンカー７２〜１００重量％とマグネシアクリンカー０〜２８重量％とからなり、化学成分がＭｇＯ４５〜７０重量％、Ａｌ ２ Ｏ ３ ３０〜５５重量％となるように配合、混練、成型、１７００℃以上で焼成することで緻密化させ、溶融スラグに対して耐食性に優れる耐火れんがを得ようとするものである。
【０００７】
【作用】
本発明に使用されるマグネシア原料としては、電融マグネシアクリンカー，海水マグネシアクリンカーのいずれを使用しても良く、またこれらを組み合わして使用しても良い。
【０００８】
スピネルクリンカーについては、ＭｇＯ含有量が４５〜６５重量％程度でかつ緻密なものが良い。４５重量％以下及び６５重量％以上のものでは焼結性に劣り、焼成後のれんがが緻密にならず溶融スラグに対して充分な耐食性が得られない。
【０００９】
【実施例】
以下に本発明品について実施例をあげて説明するが、これは発明品の特徴的なものを示したもので、特にこれに限定されるものではない。
【００１０】
本発明品と比較例を表１に示す。
【００１１】
【表１】
表１に記載した原料は、以下に示す化学成分のものを使用した。
【００１３】
マグネシアクリンカーはＭｇＯ９７重量％含有の海水マグネシアクリンカーを、スピネルクリンカーはＭｇＯ４９重量％，Ａｌ２Ｏ３４９重量％含有の焼結品を、アルミナはＡｌ２Ｏ３９９重量％含有の電融品を使用した。
【００１４】
上記原料を所定の比率で混合し、有機バインダーを加えて混練後、金型で一軸成形し、乾燥後１７５０℃で焼成し評価試料とした。
【００１５】
評価試料をアルキメデス法により、かさ比重等の物性の測定を行った。
【００１６】
試料の耐食性は、回転スラグ浸食炉を用いて評価した。浸食剤はごみ焼却場の主灰と飛灰を用いてＣ／Ｓ＝１とＣ／Ｓ＝０．５に調整したものを用い、浸食試験は１６００℃で６時間行った。
【００１７】
電融アルミナを主骨材として用いた比較例１は、スピネルクリンカーのペリクレースとスピネル反応を起こし緻密にならず、耐食性が実施例に対して大幅に劣る。
【００１８】
マグネシアを主骨材として用いた比較例２と比べて、焼結性に優れたスピネルクリンカーを主骨材として用いた実施例では、見掛け気孔率が７．８〜１１．１％といずれも緻密な焼結体になった。それに伴ない浸食指数も比較例に比べて大幅に小さくなる。
【００１９】
また浸食試験の結果から、実施例では、微粉部のマグネシアクリンカーの割合を増加させることにより、塩基度の高いスラグに対する耐食性が向上する、逆に、微粉部のマグネシアクリンカーの割合を減少させることにより、塩基度の低いスラグに対する耐食性が向上することを見いだした。
【００２０】
【発明の効果】
本発明は、ごみ溶融炉の内張りに使用する耐火物として、スピネルクリンカーを主骨材として用い緻密化させ溶融スラグに対する耐食性を持つものである。微粉部のマグネシア量を調整することで、様々な塩基度のスラグに対応できるものである。[0001]
[Industrial application fields]
The present invention relates to a refractory brick used for the lining of a refuse melting furnace.
[0002]
[Prior art]
Conventionally, chromium oxide-containing refractories having excellent corrosion resistance against molten slag have been used as refractories used for the lining of refuse melting furnaces.
[0003]
However, chromium is a component whose valence tends to change, and it is known that it easily becomes harmful hexavalent chromium in an atmosphere containing an alkali salt. From the viewpoint of environmental problems, development of a refractory that does not contain chromium oxide and has excellent corrosion resistance against molten slag is required.
[Problems to be solved by the invention]
[0004]
Silicon carbide-based refractories are used as refractories that do not contain chromium oxide, but silicon carbide is a component that is easily affected by the atmosphere, and stable durability is not obtained.
[0005]
Accordingly, an object of the present invention is to improve the corrosion resistance against molten slag by densifying the alumina-magnesia refractory brick excellent in corrosion resistance against basic slag, and to provide a lining brick for a refuse melting furnace.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises 72 to 100% by weight of spinel clinker and 0 to 28% by weight of magnesia clinker, and the chemical components are MgO 45 to 70% by weight and Al 2 O 3 30 to 55% by weight. Thus, blending, kneading, molding, and densification by firing at 1700 ° C. or higher are intended to obtain refractory bricks having excellent corrosion resistance against molten slag.
[0007]
[Action]
As the magnesia raw material used in the present invention, either an electrofused magnesia clinker or a seawater magnesia clinker may be used, or a combination thereof may be used.
[0008]
As for the spinel clinker, a dense one having an MgO content of about 45 to 65% by weight is preferable. When the content is 45% by weight or less and 65% by weight or more, the sinterability is inferior, the brick after firing is not dense, and sufficient corrosion resistance to the molten slag cannot be obtained.
[0009]
【Example】
The product of the present invention will be described below with reference to examples, but this shows the characteristic features of the product of the present invention and is not particularly limited thereto.
[0010]
Table 1 shows the product of the present invention and a comparative example.
[0011]
[Table 1]
The raw materials described in Table 1 were those having the chemical components shown below.
[0013]
Magnesia clinker uses seawater magnesia clinker containing 97% by weight of MgO, spinel clinker uses sintered product containing 49% by weight of MgO and 49% by weight of Al 2 O 3 , and alumina uses electromelted product containing 99% by weight of Al 2 O 3 did.
[0014]
The above raw materials were mixed in a predetermined ratio, an organic binder was added and kneaded, uniaxially molded with a mold, dried and fired at 1750 ° C. to obtain an evaluation sample.
[0015]
The evaluation sample was measured for physical properties such as bulk specific gravity by Archimedes method.
[0016]
The corrosion resistance of the sample was evaluated using a rotary slag erosion furnace. The erodant was adjusted to C / S = 1 and C / S = 0.5 using the main ash and fly ash from the garbage incineration plant, and the erosion test was conducted at 1600 ° C. for 6 hours.
[0017]
In Comparative Example 1 using electrofused alumina as the main aggregate, the spinel reaction with the spinel clinker periclase is not caused and it is not dense, and the corrosion resistance is significantly inferior to the examples.
[0018]
Compared with Comparative Example 2 in which magnesia was used as the main aggregate, in the examples in which the spinel clinker excellent in sinterability was used as the main aggregate, the apparent porosity was 7.8 to 11.1%. Became a sintered body. As a result, the erosion index is significantly smaller than that of the comparative example.
[0019]
Also, from the results of the erosion test, in the examples, by increasing the proportion of magnesia clinker in the fine powder part, the corrosion resistance against slag with high basicity is improved, and conversely, by reducing the proportion of magnesia clinker in the fine powder part. It was found that the corrosion resistance against slag with low basicity is improved.
[0020]
【The invention's effect】
In the present invention, spinel clinker is used as a main aggregate as a refractory used for the lining of a refuse melting furnace and is densified to have corrosion resistance against molten slag. By adjusting the amount of magnesia in the fine powder part, it can cope with slag of various basicities.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP37597299A JP4474658B2 (en) | 1999-11-27 | 1999-11-27 | Alumina-magnesia refractory brick |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP37597299A JP4474658B2 (en) | 1999-11-27 | 1999-11-27 | Alumina-magnesia refractory brick |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001158661A JP2001158661A (en) | 2001-06-12 |
| JP4474658B2 true JP4474658B2 (en) | 2010-06-09 |
Family
ID=18506366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP37597299A Expired - Lifetime JP4474658B2 (en) | 1999-11-27 | 1999-11-27 | Alumina-magnesia refractory brick |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4474658B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105565794B (en) | 2015-12-16 | 2019-04-23 | 淄博市鲁中耐火材料有限公司 | A kind of preparation method of low thermally conductive Mg-Al spinel brick |
| CN108395227B (en) * | 2018-04-26 | 2021-01-15 | 上海宝明耐火材料有限公司 | Lightweight refractory material and preparation method thereof |
| CN110282987A (en) * | 2019-07-03 | 2019-09-27 | 辽宁科技大学 | The manufacturing method of vanadium-nitrogen alloy sintering furnace magnesium aluminate spinel vacuum insulating brick |
| CN117843359B (en) * | 2023-12-20 | 2025-10-03 | 河南瑞泰耐火材料科技有限公司 | A microporous magnesium-aluminum-chromium composite brick for a waste incineration rotary kiln and its preparation method |
-
1999
- 1999-11-27 JP JP37597299A patent/JP4474658B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001158661A (en) | 2001-06-12 |
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