FIELD: ferrous metallurgy. SUBSTANCE: filter bed is formed to absorb sulfur releases taking place upon thermally treating ore material. Filter bed consists of lump iron-containing screening of thermally treated product and limestone flux. Size of flux is 2-3.5 as high as that of thermally treated product and its content in bed is maintained within the range 1-(2-10). EFFECT: improved environmental condition. 1 tbl
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