Abstract

A novel method for recovering zinc from zinc ferrite by reduction roasting-ammonia leaching was studied in this paper. The reduction thermodynamic of zinc ferrite by CO was analyzed. The effects of roasting parameters on the phase transformation and conversion rate of zinc ferrite, and the leaching behavior of zinc from the reductive roasted samples by ammonia leaching, were experimentally investigated. The mineralogical phase compositions and chemical compositions of the samples were characterized by X-ray diffraction and chemical titration methods, respectively. The results showed that most of the zinc ferrite was transformed to zinc oxide and magnetite after weak reduction roasting. 86.43% of the zinc ferrite was transformed to zinc oxide under the optimum conditions: CO partial pressure of 25%, roasting temperature of 750°C, and roasting duration of 45 min. Finally, under the optimal leaching conditions, 78.12% of zinc was leached into the solution from the roasted zinc ferrite while all iron-bearing materials were kept in the leaching residue. The leaching conditions are listed as follows: leaching duration of 90 min, ammonia solution with 6 mol/L concentration, leaching temperature of 50°C, solid-to-liquid ratio of 40 g/L, and stirring speed of 200 r/min.

中文翻译：

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焙烧后铁素体锌还原和氨浸出的还原特性

摘要

研究了还原焙烧-氨浸从铁素体锌中回收锌的新方法。分析了CO还原铁素体锌的热力学。实验研究了焙烧参数对铁素体锌的相变和转化率的影响，以及氨浸出还原性焙烧样品中锌的浸出行为。样品的矿物相组成和化学组成分别通过X射线衍射和化学滴定法进行表征。结果表明，弱还原焙烧后，大部分铁素体锌转变为氧化锌和磁铁矿。在最佳条件下：86.43％的铁酸锌转化为氧化锌：CO分压为25％，焙烧温度为750°C，烘烤时间为45分钟。最后，在最佳浸出条件下，从焙烧的铁酸锌中浸出78.12％的锌到溶液中，同时所有含铁物质都保留在浸出残渣中。浸出条件如下：浸出时间为90分钟，氨溶液浓度为6 mol / L，浸出温度为50°C，固液比为40 g / L，搅拌速度为200 r / min 。