Typical Baseline
A typical 350 TPD container glass tank running flux line at 1485°C with ~14% Na₂O experiences sidewall erosion that forces re-line at 4 years rather than the design 6 years. Glass defects ("stones") from refractory exudation degrade container yield. Sodium attack is aggressive in this temperature/chemistry envelope, and standard AZS-32 typically does not deliver design life.
Diagnostic Pattern
- Typical flux-line wear rate: 10–14 mm/year on AZS-32 (target: 6–8 mm/year)
- Glass quality: typically 1.0–1.4 stones/100 kg attributable to refractory exudation
- Baseline flux-line: AZS-32 (32% ZrO₂)
- Atmosphere: oxidising with elevated SO₃ content from petcoke fuel switch
Recommended Specification
- Flux-line course: AZS-36 (36% ZrO₂, 50% Al₂O₃, 14% SiO₂) — premium grade
- Bottom paving: standard AZS-32 (cost-effective, low wear zone)
- Throat: AZS-41 (highest premium, most aggressive zone)
- Crown: silica refractory (no change)
- Total fused cast: 145 tonnes for the flux-line and throat campaign
Installation Best-Practice
- Block dressing: each AZS-36 block hand-dressed for tight joint fit
- Joint material: AZS-36 mortar, joint width 1.5 mm maximum
- Cooling air ring: re-tuned to 22 m³/min on flux line (up from 18 m³/min)
- Heat-up: 50°C/day for first 8 days, 30°C/day to operating temperature
- Calderys + SAPL technical team on site for 3 weeks of heat-up
Expected Outcome Range
Illustrative — not project results. Actual outcomes vary with operating conditions and installation quality.
- Expected flux-line life: 4 years → 5.5 years (~30–40% improvement typical)
- Expected defect ("stone") reduction: 1.0–1.4/100 kg → 0.2–0.4/100 kg (~70–80% lower)
- Expected container line yield improvement: +1.0 to +1.6 percentage points
- Capex deferral value: ~₹50–60 crore (USD 5.3–6.4M) tank rebuild deferred 18 months
- Energy: improved cooling-air efficiency typically saves 2–3% on tank fuel
“Premium AZS-36 at the flux line — paired with re-tuned cooling air — typically delivers both longer life AND better glass quality in this application class. The two outcomes compound: less refractory exudation → fewer stones → higher yield → better margin.”