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Monolithic Refractory
Difference between high alumina refractory and clay refractory
Both high alumina refractories and clay refractories belong to aluminum silicate refractories. These refractories have the advantages of light weight, good thermal stability and good adiabatic properties, but their initial deformation temperature is 1400℃. Therefore, aluminum silicate refractories in the metallurgical industry is generally only used as thermal insulation materials, not as a working layer. The difference between aluminum silicate refractories lies in the ratio of the main components AL2O3 and SIO2, which is higher for high-alumina materials than for clay refractories. The content of clay refractories ranges from 22% to 55%, whereas high-alumina materials contain more than 50% AL2O3.
Clay refractories
Chemical properties: weakly acidic
Main raw material: refractory clay
Chemical composition content: AL2O3 content 30%~46
Mineral composition: mainly composed of mullite (25%~50%), glass phase (25%~60%), cristobalite and quartz (not more than 30%).
Advantages It is weakly acidic, has strong resistance to acid slag erosion, good thermal shock resistance, and can withstand sudden cold and heat. In addition, the production process is simple and the price is economical.
Disadvantages: low coefficient of linear expansion, low thermal conductivity, weak resistance to alkali erosion.
Uses: Clay refractories are suitable for lining acidic kilns, and are also widely used in high-temperature industrial kilns, such as blast furnaces, hot air furnaces, glass kilns and heating furnaces.
Clary Refractory bricks
High Aluminum Refractories
Chemical properties: slightly neutral
Main raw material: high alumina bauxite containing clay
Chemical composition content: Al2O3 content greater than 46
Mineral composition: industrial alumina, natural corundum and artificial corundum, high alumina bauxite and silica-magnesia bauxite (including silica-magnesia bauxite, potassium feldspar and andalusite).
Advantages: good chemical corrosion resistance, high thermal stability, refractoriness above 1770℃, load softening temperature is higher than clay, good compressive strength and slag resistance, used for steel furnace, glass kiln, cement rotary furnace lining.
Disadvantages: thermal shock resistance is slightly higher than clay brick, the price is slightly higher.
Uses: Can be used for construction of blast furnaces, steel furnace roofs, open hearth furnaces, hot air furnaces and ladles and other industrial furnaces.
Mineral composition: industrial alumina, natural and artificial corundum, high alumina bauxite, sillimanite family (including sillimanite, potassium feldspar and andalusite).
Specializing in refractory materials for over 20 years, we provide professional refractory solutions for the global high temperature industry.
