Blast Furnace Iron Runner Precast Overhaul
Frequent iron runner relining caused long downtime. Precast trough segments and quick-change blocks cut the overhaul from 5 days to 2 days and are expected to extend runner life by over 30%.
1Challenge
The slag line of the main trough suffered continuous erosion from hot metal and slag, failing to meet throughput targets, with a relining needed every 80,000–100,000 tonnes of iron. Conventional cast-in-place work required formwork, curing and dry-out, taking over 5 days per stoppage.
2Solution
Corundum-based main trough castable and SiC wear-resistant slag line material were precast in-plant as trough segments, swing spouts and quick-change blocks, then hoisted into place on site and sealed with matching mortar. Anchors and embedded parts were cast in one piece, with a steel-fibre reinforced system for thermal shock and abrasion resistance.
3Result
Relining downtime was cut from over 5 days to 2 days, boosting furnace availability. Runner life is expected to extend by over 30% with steadily rising throughput, and the customer has started second-phase cooperation on torpedo ladles.
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