Efficient recovery of valuable metals from electroplating sludge smelting soot via a combined alkali roasting and acid-free aluminum salts leaching methods

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management Pub Date : 2024-11-30 DOI:10.1016/j.wasman.2024.11.038

Yufeng Wu, Fan Yang, Hang Zhao, Ziyi Xu, Qijun Zhang

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引用次数: 0

Abstract

Electroplating sludge smelting soot (ESSS), contains high-grade value metals (such as Zn, Sn, Pb, precious metals Au and Pt) and large amounts of harmful elements Br and S, which could potentially cause valuable resources wastage and environmental pollution, therefore requires responsible recycling. An efficient and eco-friendly process for the cascade recovery of Zn, Sn, Pb, and precious metals Au and Pt from ESSS was proposed, combining NaOH roasting and acid-free aluminum salts leaching. Optimal NaOH roasting conditions achieved high extraction efficiencies for Zn, Sn, and Pb, which were then separated via water leaching. A novel Al(NO₃)₃ + AlCl₃ leaching system was developed to recover Au and Pt from the enriched residue. By optimizing the NaOH roasting conditions and the Al(NO₃)₃ + AlCl₃ leaching conditions, the decomposition and conversion of 99.91 % Zn, 99.56 % Sn, and 98.72 % Pb in ESSS were achieved, simultaneously accomplishing the leaching of 87.89 % Au and 100 % Pt. Mechanisms of NaOH roasting and Al(NO₃)₃ + AlCl₃ leaching were elucidated using XRD, SEM, ICP, XRF, and DFT calculations. Leaching kinetics of Au and Pt were also studied. Finally, Au and Pt were efficiently recovered from the leaching solution by lead powder replacement. This study provides a feasible and promising solution for the green and efficient recovery of valuable metals from ESSS.

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碱焙烧-无酸铝盐联合浸出法从电镀污泥冶炼烟尘中高效回收有价金属

电镀污泥冶炼烟尘（ESSS）中含有高价值金属（如Zn、Sn、Pb、贵金属Au、Pt）和大量有害元素Br、S，可能造成宝贵资源的浪费和环境污染，因此需要负责回收。提出了一种NaOH焙烧与无酸铝盐浸出相结合的高效环保工艺，用于从ESSS中级联回收Zn、Sn、Pb和贵金属Au、Pt。优化的NaOH焙烧条件对锌、锡、铅具有较高的萃取效率，并通过水浸将其分离。开发了一种新的Al(NO3)3 + AlCl3浸出体系，从富集渣中回收金、铂。通过优化NaOH焙烧条件和Al(NO3)3 + AlCl3浸出条件，实现了99.91% Zn、99.56% Sn和98.72% Pb在ESSS中的分解转化，同时实现了87.89% Au和100% Pt的浸出。通过XRD、SEM、ICP、XRF和DFT计算分析了NaOH焙烧和Al(NO3)3 + AlCl3浸出的机理。研究了金、铂的浸出动力学。最后，采用铅粉置换法从浸出液中有效回收金、铂。本研究为ESSS中有价金属的绿色高效回收提供了可行的解决方案。

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来源期刊

Waste management 环境科学-工程：环境

CiteScore

15.60

自引率

6.20%

发文量

492

审稿时长

39 days

期刊介绍： Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes. Scope: Addresses solid wastes in both industrialized and economically developing countries Covers various types of solid wastes, including: Municipal (e.g., residential, institutional, commercial, light industrial) Agricultural Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)