Flotation of synthetic metal phases through the example of fine fractions of waste incineration bottom ashes

以垃圾焚烧底灰细粒为例进行合成金属相的浮选

• 批准号: 403179546
• 负责人: Professor Dr.-Ing. Daniel Goldmann, since 1/2019
• 金额: --
• 依托单位: Lehrstuhl für Rohstoffaufbereitung und Recycling
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/403179546?language=en
• 关键词: Flotation; synthetic; metal; phases; through

Against the background of declining resources and the ecological and social impacts of raw materials extraction, alternative ways to secure the raw material supply raise in importance. Especially wastes containing fine-grained and finely disseminated metals possess a large potential, which is currently unexploited. Whereas the processing of coarse secondary raw materials is state-of-the-art, metal recovery from fine-grained wastes and waste fractions often does not take place due to the increasing process requirements and a lack of knowledge about the contained synthetic metal phases. Examples are slags, bottom ashes and flue dusts from metallurgical and incineration plants as well as dusts from the mechanical processing of electronic scrap.Within the scope of this project, the characterization and processing of fine fractions from waste incineration bottom ashes will be investigated as an example. They were selected because, on the one hand, they possess a significant recovery potential, especially for copper, and, on the other hand, own investigations regarding the flotation of synthetic copper phases from these fractions showed promising results. However, for a further development of this approach fundamental knowledge regarding the physico-chemical properties of the metal phases and interactions between these phases and floatation reagents is missing. In order to close this gap, first, a representative selection of waste incineration and refuse derived fuel bottom ashes will be characterized chemically and mineralogically within the project. Afterwards, the most relevant identified metal and matrix phases will be synthesized and important flotation properties determined (inter alia zeta potential, contact angle) followed by studies on interactions between the phases and potentially suitable flotation reagents (collectors, depressors, activators and frothers). These studies will be carried out with individual components as well as mixtures. In the last third of the project, the transferability of the obtained results to real bottom ashes will be investigated.

在资源减少以及原材料开采对生态和社会影响的背景下，确保原材料供应的替代方法变得更加重要。特别是含有细粒和微细浸染金属的废物具有很大的潜力，目前尚未开发。虽然粗二次原料的处理是最先进的，但由于工艺要求不断提高以及缺乏对所含合成金属相的了解，通常不会从细粒废物和废物部分中回收金属。例如，冶金厂和焚烧厂的炉渣、底灰和烟道粉尘以及电子废料机械加工产生的粉尘，在本项目范围内，将以废物焚烧底灰的细组分的表征和加工为例进行研究。选择它们是因为，一方面，它们具有显著的回收潜力，特别是对于铜，另一方面，关于从这些馏分中浮选合成铜相的研究显示出有希望的结果。然而，对于这种方法的进一步发展，缺少关于金属相的物理化学性质以及这些相与浮选试剂之间的相互作用的基本知识。 为了缩小这一差距，首先，将在项目范围内从化学和矿物学方面对废物焚烧和废物衍生燃料底灰进行表征。然后，将合成最相关的已识别金属和基质相，并确定重要的浮选特性（阿利亚zeta电位、接触角），然后研究这些相与潜在合适的浮选试剂（捕收剂、抑制剂、活化剂和起泡剂）之间的相互作用。这些研究将使用单个组分以及混合物进行。在项目的最后三分之一，将调查所获得的结果对真实的底灰的可转移性。