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Using coke with high strength after reaction in NLMK blast furnaces retarded refractory wear and intensified the process. Systematic nondestructive testing of refractory lining performed by Hatch Ltd. using the patented acousto ultrasonic-echo (AU-E) technique is another measure taken by the NLMK to ensure the safe operation and long campaign life of blast furnaces. AU-E measurements and thermocouple...
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