Zinc Volatilization Kiln · Kiln Mouth
The mouth of a zinc volatilizing kiln (rotary kiln) sits at both ends, the passage for feed and gas. It endures abrasive feed, hot dust-laden gas scouring and thermal shock, plus mechanical stress from kiln rotation. The castable detaches—a weak point of the zinc kiln lining.
Feed abrasion: incoming feed and outgoing product continuously abrade the mouth lining. Hot-gas scouring: mouth gas runs hot and dust-laden, thermally scouring and abrading the lining. Thermal shock: rotation periodically exposes the mouth to hot and cooler environments; thermal-shock stress cracks the lining. Mechanical stress: mouth armor and lining bear alternating stress under rotation and vibration.
After mouth fall-out, the shell overheats and deforms, sealing degrades, and air leakage hurts kiln atmosphere and zinc recovery; in severe cases the mouth burns through, forcing kiln shutdown for repair.
Select the kiln mouth for "wear resistance + thermal-shock resistance":
Formwork casting: cast the annular mouth precisely for tight bonding to the kiln. Vibration: vibrate fully. Water control: follow the datasheet. Bake-out: follow the curve to prevent early spalling. Armor installation: mount armor securely in coordination with the lining.
Monitor mouth shell temperature and sealing; inspect lining wear and armor regularly and patch thinned zones promptly. At maintenance, replace worn armor, patch lining and record mouth-life data to optimize grade and structure.
Steel-fiber reinforced castable with 2-3 vol% heat-resistant stainless fibers provides random reinforcement and toughening. Al₂O₃≥65%, 1400℃ max service, greatly improved flexural and thermal-shock spalling resistance.
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Wear-resistant castable with hard abrasion-resistant aggregate, Al₂O₃≥70%, 1500℃ max service and CCS≥90MPa. Dense matrix resists particulate erosion in gas-solid two-phase flow.
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LA-60 high-alumina castable uses bauxite clinker aggregate with Al₂O₃≥60% and a max service temperature of 1600℃. Its low-cement bond gives high density and good thermal-shock resistance.
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