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Coke Breeze-less Sintering of BOF Dust and Its Capability of Dezincing

机译：转炉粉尘无焦微粉烧结及其脱锌能力

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摘要

In order to promote recycling of basic oxygen furnace (BOF) dust, sintering of the dust without coke breeze (fuel) has been researched by pot test method and the possibility of dezincing during the sinter in has been evaluated. Typical BOF dust, containing about 20 of metallic iron (M.Fe), is agglomerated without fuel and dezinced by about 50 during sintering. The agglomeration is caused by heat generation due to oxidation of the metallic iron. The dezincing takes place by the reaction: ZnO+M.Fe→Zn(gas)+FeO at elevated temperature. Secondary dust emitted during sintering mainly consisted of ZnO containing 40 to 50/100 of zinc. The ratio of dezincing is improved by blast furnace (BF) dust addition and up-draft sintering method. The carbon is BF dust produces metallic iron and CO gas from "FeO" melt, then they accelerate ZnO reduction. The up-drafting makes a melt pool in the lower layer, where the melt remains longer at high temperature, resulting in increase in the ratio of dezincing.
机译：为了促进碱性氧气炉（BOF）粉尘的再循环，已经通过锅试验法研究了没有焦风（燃料）的粉尘的烧结，并且已经评估了在烧结过程中脱锌的可能性。典型的BOF粉尘包含约20种金属铁（M.Fe），在没有燃料的情况下会结块，并且在烧结过程中会脱锌约50％。结块是由于金属铁的氧化而产生的热量引起的。脱锌通过以下反应进行：ZnO + M.Fe→Zn（gas）+ FeO在高温下进行。烧结过程中产生的二次粉尘主要由含40至50/100锌的ZnO组成。高炉除尘和上浮烧结法提高了脱锌率。高炉粉尘中的碳是由“ FeO”熔体产生金属铁和CO气体，然后它们加速ZnO的还原。上升气流在下层形成一个熔池，熔池在高温下保持更长的时间，导致脱锌率增加。

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