| 摘要 |
1514363 Treating flue-dusts and slimes FRIED KRUPP GmbH 30 April 1976 [3 May 1975]17791/76 Heading C1A[Also in Division C7] Dusts and/or slimes having a moisture content of 10-16% from dust removal plants in the smelting industry are pelletized for less than 6 minutes with addition of water to give green pellets of 17-30% moisture content which are charged with solid reducing agents into a rotary tube furnace. Suitable reducing agents include anthracite, coke dust, and brown coal. The temperature of the furnace is suitably 900-1100‹C. and the reduced metallized pellets are withdrawn as iron sponge. Zn and Pb volatilize and are reoxidized in the free space of the furnace to oxides, and NaOH and KOH vapourize.
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