| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a reduced briquette, which can sufficiently secure the strength of the briquette after having baked when manufacturing the reduced briquette by using collected dust which is formed in a steel smelting process as a raw material and reducing the dust in a reductive baking furnace. <P>SOLUTION: A raw material blend mixture is prepared by the steps of: blending 2 to 15 mass% of neutralized sludge, which is produced in a pickling waste liquid treatment process and contains a CaF<SB>2</SB>component, and 10 to 15 mass% of carbonaceous material with a collected dust which is produced in the steel-smelting process; adding an organic binder of 5 to 10 mass% by outer percentage to the blend; and further adding a lime source to the blend so that the basicity (CaO/SiO<SB>2</SB>) in the blent raw material can be in a range of 0.3 to 1.0. The method for manufacturing the reduced briquette comprises the steps of: kneading the raw material blend mixture; molding the kneaded mixture into a briquette; and then reducing the briquette while baking the briquette in a reductive baking furnace in an atmosphere of 1,250°C or higher for 25 minutes or longer. A steel to be smelted is preferably a stainless steel. Quicklime or hydrated lime can be used as the lime source. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
