As a by-product of the steelmaking industry rich in iron and zinc, electric arc furnace dust (EAFD) landfill disposal is restricted in many countries due to the metal lixiviation risks. Several approaches have been examined to recycle or reuse EAFD. Hydrometallurgical methods mainly include the preparation of pregnant acid leached solution (PLS) using inorganic acids followed by selective metal recovery using different methods. We herein proposed a hydrometallurgical process initiated by acid leaching and finalized by thermal treatment to produce nano-ZnO from EAFD. At the condition of this study, only 67% of zinc was leached by sulfuric acid from EAFD into PLS while 98% of surplus leached iron was removed through precipitation by sodium hydroxide. Additional purification of iron removed PLS was accomplished using di-2 ethylhexyl phosphoric acid to extract Zn⁺². The addition of ammonium hydroxide to purified PLS provided (Zn(OH)₂)₃(ZnSO₄)(H₂O)₅ as the final precursor for nano-ZnO that ultimately transformed to nano-ZnO (60 ± 6 nm particle size) at 850 °C. The achieved results were scrutinized through various tests and analyses including TEM, XRD, SEM, EDS, FTIR, and TGA.

Graphical Abstract

中文翻译：

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一种湿法冶金从电弧炉粉尘生产纳米ZnO的方法

作为富含铁和锌的炼钢工业的副产品，由于金属浸出的风险，电弧炉粉尘（EAFD）垃圾填埋场在许多国家/地区受到限制。已经研究了几种回收或再利用EAFD的方法。湿法冶金方法主要包括使用无机酸制备富集酸的浸出溶液（PLS），然后使用不同的方法进行选择性金属回收。我们在本文中提出了一种湿法冶金工艺，该工艺通过酸浸法引发并通过热处理最终定型，以从EAFD生产纳米氧化锌。在这项研究的条件下，只有67％的锌被硫酸从EAFD浸出到PLS中，而98％的剩余浸出铁通过氢氧化钠沉淀被去除。⁺²。向纯化的PLS中添加氢氧化铵可提供（Zn（OH）₂）₃（ZnSO ₄）（H ₂ O）₅作为纳米ZnO的最终前体，最终转变为纳米ZnO（粒度为60±6 nm）在850°C下。通过各种测试和分析（包括TEM，XRD，SEM，EDS，FTIR和TGA）对获得的结果进行了审查。

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