FIELD: high-temperature roasting. SUBSTANCE: plant has heating chamber 1 with heat insulation 2 and U-shaped silicidemolybdenum heaters 3 mounted in vertical passages on lateral sides of chamber 1. Heaters 3 are isolated from working space of chamber 1 with source of gaseous fluorides by vertical ceramic screens 5 at clearance 6 where powder-like mixture of potash feldspar with magnesium oxide is placed. Screens 5 are made of porous refractory ceramic chemically resistant to gaseous fluorides made, for example from mullite or bokor. EFFECT: increased service life of plant. 2 dwg, 2 tbl
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Authors
Dates
1995-06-19—Published
1990-06-27—Filed