Refractory Silica Brick
01. Silica fire brick is an acid-refractory material, dengan rintangan yang baik terhadap hakisan sanga asid, and load softening temperature of up to 1640 ~ 1670 ℃, the volume of long-term use at high temperatures is relatively stable.
02. It is mainly used in the partition wall of the charring room and combustion room of the coke oven, the heat storage room and slagging room of the steel-making flat furnace, equalization furnace, refractory material of the glass melting kiln and ceramic firing kiln, dan lain-lain., and other load-bearing parts of the kiln’s vaults and so on. It is also used in the high-temperature load-bearing part of hot blast furnaces and the roof of acid-flat furnaces.
03. It is mainly acidic refractory material composed of scaled quartz, kuarza persegi, and a small amount of residual quartz and glass phase. Silicon dioxide content of 94% atau lebih. Ketumpatan sebenar 2.35g/cm3.
Tahan hakisan sanga berasid. Kekuatan suhu tinggi yang lebih tinggi. Muatkan suhu mula melembutkan 1620～1670℃. Tiada ubah bentuk di bawah suhu tinggi untuk kegunaan jangka panjang. Kestabilan kejutan haba yang rendah (pertukaran haba dalam air adalah 1~4 kali).
Silika semulajadi sebagai bahan mentah, ditambah dengan jumlah agen mineralisasi yang sesuai, untuk menggalakkan transformasi kuarza dalam badan kosong kepada, kuarza skala. Dipecat secara perlahan-lahan di bawah suasana mengurangkan oleh 1350 ~ 1430 ℃.
Pemanasan ke 1450 ℃ kira-kira 1.5 ~ 2.2% daripada jumlah pengembangan volum, pengembangan sisa ini akan memotong sendi rapat, untuk memastikan badan batu mempunyai kedap udara dan kekuatan struktur yang baik.
Kuarza skalar, kuarza argillaceous, dan kuarza sisa mempunyai perubahan besar dalam isipadu pada suhu rendah disebabkan oleh perubahan jenis kristal, so the thermal stability of silica bricks at low temperatures is poor.
During use, it should be heated and cooled slowly below 800℃ to avoid cracks. Oleh itu, should not be used in 800 ℃ below the temperature of the rapid change in the kiln.
04. The nature and process of silica bricks are closely related to the crystalline transformation of SiO2. Oleh itu, the true specific gravity is an important quality indicator of silica bricks.
General requirements in 2.38 or less, high-quality silica refractory bricks should be 2.35 or less. True specific gravity is small, reflecting the brick in the number of scale quartz and square quartz, residual quartz amount is small, so the residual linear expansion is small, and the use of strength decline is also less.
Silicon dioxide has seven crystalline variants and one amorphous variant. Varian ini boleh dibahagikan kepada dua kategori: jenis varian pertama ialah kuarza, kuarza, dan kuarza, struktur kristal mereka sangat berbeza, dan transformasi antara satu sama lain sangat perlahan. Jenis varian kedua ialah subspesies daripada varian di atas – jenis a b dan c, struktur mereka adalah serupa, dan transformasi antara satu sama lain lebih cepat.
05. Bahan mentah untuk pembuatan bata silika adalah silika. Dalam bahan mentah Silika, semakin tinggi kandungan SiO2, semakin tinggi refraktori. Kekotoran yang paling berbahaya ialah Al2O3, K2O, Na2O, dan lain-lain., mereka serius mengurangkan refraktori produk refraktori.
Batu bata silika diperbuat daripada silika dengan kandungan SiO2 tidak kurang daripada 96%, menambah agen mineralisasi (cth., penimbang besi, susu kapur) dan agen pengikat (cth., molase, cecair sisa pulpa sulfit), dan dihasilkan dengan mencampurkan, acuan, pengeringan, and sintering processes.
Silica bricks are mainly used in coke ovens, relau kaca, acid steel furnaces, and other thermal equipment. The following two points should be noted when using silica bricks:
1. When the silica product is at 200~300℃ and 573℃, the volume will expand suddenly due to crystal transformation. Oleh itu, when baking, the temperature rise below 600℃ should not be too fast, and drastic temperature changes should be avoided when cooling to below 600℃.
2. Avoid contact with alkaline slag as much as possible.
Technical Conditions Of Silica Bricks For Industrial Kilns
Silica Bricks For Coke Ovens
Silica fire bricks for coke ovens are a kind of silica refractory material used to build coke ovens with quartz crystals. Silica bricks for coke oven should have the following characteristics:
1. High load softening temperature. Silica brick for coke oven should be able to withstand the dynamic load of coal loading truck at high temperatures at the top of the furnace, and not be deformed in long-term use. Oleh itu, the Coke oven silica brick load softening temperature requirements are high.
2. High thermal conductivity. Coke is made from coking coal in the carbonization chamber by conducting heat in the combustion chamber wall. Oleh itu, the silica bricks used to build the combustion chamber wall should have high thermal conductivity.
3. Rintangan kejutan haba yang baik. As the coke oven needs to be regularly loaded and coke discharged, the temperature of the silica bricks on both sides of the combustion chamber will change dramatically, so the coke oven silicon bricks are required to have good thermal expansion.
4. High-temperature volume stability.
Silica Bricks For Glass Kiln
Silica brick for glass kilns is quartz as the main component of silica refractory materials, used in the construction of glass kiln high-temperature components. Silica bricks for glass kilns should have the following characteristics:
1. Stable high-temperature volume, the furnace body will not change due to temperature fluctuations.
2. No pollution to the glass liquid.
3. Tahan kepada hakisan kimia.
4. Ketumpatan pukal kecil.
PER Refractories company produces a large amount of silica brick, many varieties, mainly used in coke ovens, carbonization chambers, combustion chambers and partition walls and glass kiln roofs, kiln pools. There are also high-temperature load-bearing parts of the hot blast stove, carbon roasters, and other kilns that also use alumina silica bricks for the lining.
