| 摘要 |
<p>A method for recovering zinc from zinc-containing materials, especially from zinc-containing material recovered from waste gases in metallurgical smelting processes. Particular zinc-containing materials are agglomerated together with a carbonaceous reduction material and optionally slag forming materials, and are supplied to a gas tight, closed, electrothermic smelting furnace (1) containing a molten bath kept at a temperature between 1200 and 1700 DEG C in which the agglomerates are smelted and subjected to selective reduction and volatilisation of zinc and other volatile metals. An inert slag phase and optionally a liquid metal phase are tapped (8, 9) from the smelting furnace, and zinc and other volatile metals are recovered from the waste gas from the smelting furnace by condensation (6). In order to prevent reoxidation of metallic zinc, the particulate zinc-containing materials are agglomerated together with a carbonaceous binder which cracks at a temperature below 700 DEG C and forms carbon black, and the temperature in the gas atmosphere in the smelting furnace is kept above 1000 DEG C in order to maintain a volume ratio between CO2 and CO in the gas atmosphere in the smelting furnaces below 0.3. <IMAGE></p> |
