Recycling of an electric arc furnace flue dust to obtain high grade ZnO
Recycling of an electric arc furnace flue dust to obtain high grade ZnO
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DOI：
10.1016/j.jhazmat.2006.06.079
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发表时间：
2007-03-06
影响因子：
13.6
通讯作者：
Alguacil, Francisco Jose
中科院分区：
文献类型：
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作者：
Ruiz, Oscar;Clemente, Carmen;Alguacil, Francisco Jose
在电弧炉（EAF）中生产钢铁会产生一种称为EAF粉尘的副产品。这些炼钢烟道粉尘在大多数工业化国家被归类为危险残留物，因为其中所含的重金属在微酸性降雨条件下往往会浸出。然而，与此同时，它们含有可用作获得有价值的副产物的来源的锌物质。本研究显示了使用碳酸铵溶液处理电弧炉烟尘的结果。一旦锌溶解：ZnO +4 NH（3）+ H2O -> Zn（NH3）（4）（2+）+2 OH（-）与其他杂质（即镉和铜），这些通过与金属锌的置换从锌溶液中消除。将纯化的锌溶液蒸发（蒸馏）直到碳酸锌物质沉淀，然后将其煅烧以产生高等级的氧化锌。对于来自浸出操作的主要由铁酸锌组成的未被侵蚀的粉尘残留物，可以考虑几种选择：回循环到炉中，通过氢氧化钠处理进一步处理或由于其相对惰性而更安全地倾倒。(c)2006 Elsevier B. V.保留所有权利。
The production of steel in electric arc furnace (EAF) generates a by-product called EAF dusts. These steelmaking flue dusts are classified in most industrialized countries as hazardous residues because the heavy metals contained in them, tend to leach under slightly acidic rainfall conditions. However, and at the same time they contain zinc species which can be used as a source to obtain valuable by-products. The present investigation shows results on the processing of an EAF flue dust using ammonium carbonate solutions. Once zinc is dissolved:ZnO + 4NH(3) + H2O -> Zn(NH3)(4)(2+) + 2OH(-)with other impurities (i.e. cadmium and copper), these are eliminated from the zinc solution via cementation with metallic zinc. The purified zinc solution was evaporated (distilled) until precipitation of a zinc carbonate species, which then was calcined to yield a zinc oxide of a high grade. For the unattacked dust residue from the leaching operation, mainly composed of zinc ferrite, several options can be considered: back-recycling to the furnace, further treatment by sodium hydroxide processing or a more safely dumping due to its relatively inertness. (c) 2006 Elsevier B.V. All rights reserved.