What materials do refractories generally refer to? How do you classify it? Here, take a look with the furnace lining material sales manufacturers!

Refractory materials generally refer to inorganic non-metallic materials with a refractoriness above 1580 ° C. It includes natural ores and various products made by a certain process according to a certain purpose. It has certain high temperature mechanical properties and good volume stability.

There are many ways to classify refractories. According to chemical composition: can be divided into acidic, alkaline and neutral.

1, acid refractory material

Acid refractory usually refers to the SiO2 content of more than 93% of the refractory, its main feature is that at high temperatures can resist the erosion of acid slag, but easy to react with alkaline slag. Acid refractories mainly include quartz glass products, fused quartz recombined products, silicon bricks and amorphous silica refractories. Semi-siliceous refractories are also generally classified in this category. As for clay refractories, there are also classified into this category, called semi-acidic or weakly acidic refractories. There are zircon refractories and silicon carbide refractories as special acid refractories are also classified in this category.

2, neutral refractory material

At high temperatures, refractories that are not easy to react significantly with acidic or alkaline slag are called neutral refractories, such as carbon refractories and chromium refractories. Some high aluminum refractories are also classified as neutral refractories with some acid tendency, while chrome refractories are listed as neutral refractories with some alkaline tendency.

3, alkaline refractory material

Basic refractories generally refer to refractories with magnesium oxide or magnesium oxide and calcium oxide as the main components. The refractories of these refractories are high, and the ability to resist alkaline slag is strong. Basic refractory materials are mainly used in basic steel furnaces and non-ferrous metal smelting furnaces, and the cement industry often uses such materials. Its main products are magnesia, magnesia chrome, magnesia olivine, magnesia aluminum, dolomite and limestone refractory materials. Among them, magnesia, dolomite and limestone belong to strong alkalinity, and chromium-magnesia, magnesia chromium-chromite, magnesia olivine and spinel belong to weak alkalinity.

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