| 摘要 |
<p>PURPOSE:To recover valuable metals consisting of Ni, Cr and Fe easily by making use of the sensible heat of the high-temp. molten slag from a steel making furnace to make simultaneously the treatment of the Ni-contg. dust and sludge such as special steel dust and sludge and the treatment of the steel making slag. CONSTITUTION:The metal and molten slag tapped from an electric furnace 1 for alloying is gravity-separated in a ladle 2 and only the molten slag 4 is made to overflow down into a ladle 3 where the molten slag is stored. On the other hand, the dust and sludge as well as the required amt. of a reducing agent and alkali metallic carbonate are kneaded and are briquetted 5 by a briquetting machine 8. Such briquettes are dried and preheated 7 and are then feed into a feeder 6. The briquettes 5 are simultaneously dropped from the feeder 6 into the ladle 3 in the stage when the molten slag 4 falls into the ladle to mix thoroughly the molten slag and the briquettes and to transmit substantially the sensible heat of the molten slag 4 to the briquettes 5. As a result the reduction reaction of Ni, Fe and Cr in the briquettes is accelerated and the steel making slag is reformed. The reduction reaction arises and mainly the metals, Ni, Fe and Co are formed when the temp. of the briquettes 5 rises to about >=900 deg.C. Namely, the Fe-Ni-Cr alloy grains and reformed steel making slag are separated and recovered.</p> |
