METHOD FOR REUTILIZING WASTE MATERIAL IN STAINLESS STEEL PRODUCTION PROCESS

摘要

PROBLEM TO BE SOLVED: To provide a reutilizing method of a waste material in a stainless steel production process which dissolves an environmental pollution problem and plactically uses the given resource and energy in the max. limit and has excellent profitability. SOLUTION: This reutilizing method is composed of the following four processes. Granulating process 1: Chromium-containing blended material M blending suitable quantity of chromium ore 0 into chromium waste material W produced in the stainless steel production process and coke C are granulated to produce pellet P. Reduction process 2: This pellet P is laid on the furnace hearth 21 of a rotary hearth furnace 20 and heated with combustion gas and the collapse and the powering of the pellet P are minimized to produce a chromium-containing iron pellet N1. Waste heat recovering process 3: The sensible heat having the waste gas F1 in the reduction process 2 is recovered as steam S. Zinc-containing dust recovering process 4: The zinc-containing dust Z produced in the reduction process 2 and accompanied with the waste gas F2 in the waste heat recovering process 3 is separated and collected to recover the zinc-containing dust.