Zn-recovery from steel making dusts - Kinetics and mechanism of thermal zinc-ferrite phase decomposition

从炼钢粉尘中回收锌 - 热锌铁氧体相分解的动力学和机理

• 批准号: 42595291
• 负责人: Professor Dr.-Ing. Bernd Friedrich
• 金额: --
• 依托单位: Institut für Metallurgische Prozesstechnik und Metallrecycling (IME)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/42595291?language=en
• 关键词: Zn; recovery; steel; making; dusts

Zinc-iron concentrate as a by-product from EAF-dust processing (as well as from primary ore processing) counts as waste for disposal, although an available content of zinc represents about from 300 to 500 €/t. Every year approx. 65.000-75.000 tons zinc are lost in European countries. In former times this material was consumed in West-European Imperial Smelting Furnaces, but this technology now it is not accessible anymore after closure of those plants. Because of the presence of Cd, Zn and As in such materials their recycling disposal is not acceptable. At the moment the yield of metals by existing metallurgical treatment processes amounts smaller than 20 %. The high content of sulphur (5-13 mass percent) does not allow a treatment in the common Waelz process. This project focuses on a pyrometallurgical treatment of iron-zinc concentrate in order to study the mechanism and kinetics of thermal zinc ferrite phase decomposition. Fundamental experiments in a modified Tamman furnace should be performed in a very weak reducing atmosphere at 1150°C to prevent Zinc-gas-formation. After established optimal parameters the thermal decomposition of zinc ferrite will be investigated in a rotary kiln furnace in order to investigate the technical feasibility. The chemical equilibrium and the kinetics of this process step as well as for the subsequent hydrometallurgical recovery of zinc from a solid residue is studied with suitable computer models and validated under laboratory conditions. The research will be conducted as a DFG-partner project with the Institute of Chemical Technology in Prague.

锌铁的浓度是EAF盘处理（以及初级矿石加工的）副产品的副产品，但可将锌的废物视为废物，尽管锌的可用含量约为300至500欧元/t。每年大约欧洲国家损失了65.000-75.000吨锌。在以前，这种材料是在西欧洲帝国冶炼炉中消耗的，但是现在这项技术在关闭这些植物后无法使用。由于存在CD，Zn和在此类材料中，回收处置是不可接受的。目前，现有的冶金处理过程的金属产量高于20％。硫的高含量（5-13个质量百分比）不允许在普通WAELZ过程中进行治疗。该项目的重点是对铁锌浓度的高温治疗，以研究改良的Tamman炉中热锌基本实验的机制和动力学，应在1150°C的非常弱的还原大气中进行，以防止锌-GAS成型。建立最佳参数后，将在旋转窑炉中研究锌铁酸盐的热分解，以研究技术可行性。该过程步骤的化学平衡和动力学以及随后从固体居住的锌恢复锌的后续水平恢复，均具有合适的计算机模型，并在实验室条件下进行了验证。这项研究将与布拉格化学技术研究所一起作为DFG合作社项目。