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Chromsteine

Chromium Corundum Bricks

Chromium oxide shows a seamless miscability with Al₂O₃ (chromium corundum formation) and does not bond chemically with silica glasses. Chromium corundum bricks are formed from  mineral corundum which is enbedded and finely distributed in eskolait. Optimal compression with an ideal texture (homogenity, size of pores and their distribution) is achieved by the possibility of isostatic shaping.

Isostatically pressed chromium oxide corundum bricks with about 85 %, 60 %, 50 % and 30 % chromium oxide parts are mainly used as palisades (also electrode blocks) in glass contact areas in sodium borosilicate glass melters (C glass melters) for the manufacture of insulating glass fibres (glasswool) and mineral melters for the manufacture of mineral fibre insulation (rockwool).

Uniaxial pressed, hand rammed and vibration compressed chromium oxide corundum bricks with a chromium oxide content of 15 % – 80 % chromium oxide are mainly used in melters for alkali borosilicate glass (C-Glass) and mineral melters in the glass contact area (tile formats, shaped bricks and channels) and in the superstructure of furnaces (standard bricks, shaped bricks). These brick types are also used in E-glass melters in the superstructure and the exhaust.

Pressed, chemically bound chromium oxide corundum bricks with chromium oxide content of 5 % - 10 %, together with additives which positively influence the elasticity of the texture, are mainly used in hazardous waste incineneration plants. They excellently withstanding the thermal, chemical and mechanical stresses in the rotary duct of  the plant.
 

Materials

  • at 15 % Cr₂O₃ content are used in the glass contact area in bottom blocks, in the superstructure of C-glass melters and mineral melters, and in the exhaust area of E-glass melters

  • at 30 %, 50 % and 60 % Cr₂O₃  content -  depending on the temperature demands in the glass contact area, the materials  are used  in bottom block, shaped brick or channel in C-glass and mineral melters, in the superstructure, and in the exhaust area of  C-glass melters, mineral melters and E-glass melters

  • at 80 % Cr₂O₃ content the materials are used in cover tiles in lime natron silica melters