Leaching of the hazardous electric arc furnace (EAF) dust containing mainly zinc ferrite and zinc oxide, accompanied by minor concentrations of arsenic compounds, was investigated using sulfuric acid. In order to reach the maximum recovery of zinc, the leaching solution was adjusted to recover both iron and zinc at their maximum possible values. To obtain a high recovery value of zinc and iron, analyzed by AAS, the optimum leaching condition was found to be the temperature of 90 °C, the sulfuric acid concentration of 3 M, the particle size of 75 μm, the S/L ratio of 1:10 g/mL and the leaching time of 2 h. The percentages of the zinc and iron recovery under the optimum condition were ca. 98.6% and 99.1% respectively, which were verified by a confirmation test and were very close to the predicted values of 100% based on the optimized model, obtained through the software. From the thermodynamics’ point of view, it has been found that Zn²⁺ is the predominant species (90%) under the leaching condition applied. Moreover, the predominant species of iron are FeSO₄⁺, FeHSO₄²⁺, Fe(SO₄)₂^- and Fe³⁺ in the magnitudes of 65.8%, 25.6%, 4.4% and 4.0%, respectively. According to the kinetic results, the controlling step in the leaching was the chemical reaction at the most of the operating temperatures and times. In order to purify the zinc solution for electrowinning, iron and arsenic were removed through the jarosite formation process as confirmed by the XRD results. The speciation of arsenic in the precipitated jarosite was explored by XPS. Finally, the low concentrations of arsenic (less than 0.1 ppm) and iron (less than 50 ppm) were determined by the ICP analysis.

使用硫酸研究了主要包含铁酸锌和氧化锌以及少量砷化合物的有害电弧炉粉尘的浸出。为了达到锌的最大回收率，调节浸出溶液以回收铁和锌的最大可能值。为了获得较高的锌和铁回收值，通过AAS分析，发现最佳的浸出条件是温度为90°C，硫酸浓度为3 M，粒径为75μm，S / L比1:10 g / mL的浸出时间和2 h的浸出时间。在最佳条件下，锌和铁的回收百分率约为。经过确认测试验证的结果分别为98.6％和99.1％，非常接近基于优化模型的100％的预测值，通过软件获得。从热力学的角度，发现锌^{2 +}是应用浸出条件下的优势菌种（占90％）。此外，铁的主要种类是的FeSO ₄ ⁺，FeHSO ₄ ²⁺，铁（SO ₄）₂ ^-和Fe ³⁺分别为65.8％，25.6％，4.4％和4.0％。根据动力学结果，浸出的控制步骤是在大多数操作温度和时间下的化学反应。为了纯化用于电沉积的锌溶液，通过X射线衍射结果证实，通过黄钾铁矾形成过程除去了铁和砷。XPS探索了沉淀的黄钾铁矾中砷的形态。最后，通过ICP分析确定了低浓度的砷（小于0.1 ppm）和铁（小于50 ppm）。