New pyrometallurgical process of EAF dust treatment with CaO addition
New pyrometallurgical process of EAF dust treatment with CaO addition
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DOI：
10.1007/s12613-015-1135-6
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发表时间：
2015-08-01
影响因子：
4.8
通讯作者：
Nagasaka, Tetsuya
中科院分区：
文献类型：
--
作者：
Chairaksa-Fujimoto, Romchat;Inoue, Yosuke;Nagasaka, Tetsuya
在实验室规模上研究了电弧炉烟尘的非碳热法炼锌工艺。该方法的主要目的是通过添加CaO将高稳定性的铁酸锌（ZnFe 2 O 4）（其占EAF粉尘中总锌的一半以上）转化为ZnO和Ca 2Fe 2 O 5。将EAF粉尘与CaO粉末以各种比例混合，压制成丸粒，并在空气中在700至1100摄氏度的温度范围内在加热炉中加热预定的保持时间。当添加足够的CaO以实现Ca/Fe摩尔比为1.1时，在900 ℃的最低温度下在1小时内所有ZnFe 2 O 4转化为ZnO和Ca 2Fe 2 O 5。然而，在较高的温度下，需要超过化学计量比的过量CaO，因为它被反应消耗，导致形成ZnFe 2 O 4以外的化合物。还研究了电炉粉尘中卤化物和重金属的蒸发。在1100 ℃时，CaO的加入使这些组分优先挥发到气相中。
The non-carbothermic zinc pyrometallurgical processing of electric arc furnace (EAF) dust was investigated on a laboratory scale. The main objective of this process was to convert highly stable zinc ferrite (ZnFe2O4), which accounts for more than half of total zinc in the EAF dust, into ZnO and Ca2Fe2O5 by CaO addition. The EAF dust was mixed with CaO powder in various ratios, pressed into pellets, and heated in a muffle furnace in air at temperatures ranging from 700 to 1100A degrees C for a predetermined holding time. All ZnFe2O4 was transformed into ZnO and Ca2Fe2O5 at a minimum temperature of 900A degrees C within 1 h when sufficient CaO to achieve a Ca/Fe molar ratio of 1.1 was added. However, at higher temperatures, excess CaO beyond the stoichiometric ratio was required because it was consumed by reactions leading to the formation of compounds other than ZnFe2O4. The evaporation of halides and heavy metals in the EAF dust was also studied. These components could be preferentially volatilized into the gas phase at 1100A degrees C when CaO was added.