Refractory balls are commonly used heat storage or support materials in industrial high temperature equipment. Their classification is mainly based on material composition and performance characteristics. The following are common classifications and their brief introduction:

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1. Alumina refractory balls
Ингредиенты: Mainly alumina (Al₂O₃), the content is usually between 48% и 99%.
Функции:
– Ordinary high-alumina balls (Al₂O₃ 48%~75%): высокая термостойкость (1600~1750℃), Хорошее сопротивление теплового шока, and moderate cost.
– Corundum balls (Al₂O₃ ≥90%): Высокая твердость, strong corrosion resistance, temperature resistance can reach more than 1800℃, but the cost is relatively high.
Приложение: high temperature environments such as blast furnaces, горячие доменные печи, and ceramic kilns.

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2. Silica refractory balls
Ингредиенты: в основном диоксид кремния (SiO₂) (≥93%), such as quartz refractory balls.
Функции:
– Resistant to acidic environments, but easily reacts with alkaline substances at high temperatures.
– Temperature resistance of about 1600~1700℃, with a low thermal expansion coefficient.
Приложение: Acidic atmosphere environments such as glass kilns and coke ovens.

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3. Magnesium refractory balls
Ингредиенты: Mainly magnesium oxide (MgO), the content can reach more than 90%.
Функции:
– Resistant to alkaline slag erosion, high high temperature strength (temperature resistance 1600~1800℃).
– But poor thermal shock resistance, easy to absorb water.
Приложение: Alkaline high temperature environment such as steelmaking electric furnace and converter.

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4. Zirconium refractory balls
Ингредиенты: Contains zirconium oxide (Zro₂, usually 20%~95%), often compounded with alumina or silica.
Функции:
– Отличная сопротивление теплового шока, strong corrosion resistance, temperature resistance up to 2000℃.
– High cost, mostly used in extreme environments.
Приложения: Glass melting furnace, metallurgical special furnace, aerospace field.

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5. Silicon carbide refractory ball
Ингредиенты: Mainly silicon carbide (Карбид кремния), content 70%~99%.
Функции:
– Good thermal conductivity, excellent wear resistance, anti-oxidation (temperature resistance 1400~1600℃).
– May oxidize at high temperature, need to be matched with anti-oxidation coating.
Приложение: Chemical reactors, ceramic roller kilns and other scenes requiring high thermal conductivity.

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6. Composite refractory balls
Common types: aluminosilicate (Al₂O₃+SiO₂), magnesium-aluminum spinel (MgO+Al₂O₃), и т. д..
Функции:
– Balance performance by adjusting the composition ratio, such as aluminosilicate balls can adapt to different temperatures (1200~1600℃).
– Spinel has strong resistance to thermal shock and slag erosion.
Приложение: Цементная вращающаяся печь, hot blast furnace heat storage body.

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7. Lightweight refractory balls
Состав: porous structure, usually made of alumina, mullite or floating beads.
Функции:
– Low density (0.8~1.5 g/cm³), низкая теплопроводность, used for insulation layer.
– Low mechanical strength, temperature resistance generally does not exceed 1400℃.
Приложение: Insulation layer of industrial furnaces.

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Selection suggestions:
*Temperature and atmosphere: Choose magnesium for high temperature alkaline environment, choose silicon for acidic environment, and choose corundum or zirconium for extreme temperature.
*Economical efficiency: Silicon carbide and zirconium are expensive and need to be weighed according to the budget.
*Functional requirements: High aluminum or composite materials are preferred for heat storage, silicon carbide is selected for wear resistance, and lightweight materials are used for heat insulation.