COMBATTING LIME KILN RINGING PROBLEMS AT THE ARAUCO CONSTITUCIÓN MILL, 19PEERS

The lime kiln at the Arauco Constitución mill experienced severe ringing problems requiring it to be shut down for ring removal every 3 to 6 months. The mill controlled the problems by blasting ring deposits off during operation with its existing industrial shotgun and a newly installed Cardox liquid CO₂ cartridge system. Various ring blasting procedures were tested to determine the optimum ring location and thickness to blast, the optimum depth to insert the CO₂ cartridge into the kiln, and the most effective blasting frequency and sequence to employ. The best ring blasting strategy was found to be the weekly blasting operation alternated between the Cardox system and the industrial shotgun, with the blasting aimed at rings at about 28 m (92 ft) from the kiln discharge end, and the CO₂ cartridge inserted into the ring mass, 20 cm (8”) away from the refractory brick surface. With this blasting strategy, the kiln has been able to operate nonstop between annual maintenance shutdowns. 

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