Sustainable silver recovery by chemical treatment of metal rich fines from solar panel waste

IF 6.3 2区材料科学 Q2 ENERGY & FUELS

Solar Energy Materials and Solar Cells Pub Date : 2024-11-07 DOI:10.1016/j.solmat.2024.113259

Omkar Gajare , Neha Balaji Jadhav , Sarita Zele, Nishita Lucas, Nivedita Gogate

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引用次数: 0

Abstract

Solar photovoltaic power generation has seen rapid growth worldwide which is also giving rise to large amount of waste solar panels at end of life. Due to lack of clear strategy to recycle the waste solar panels, most will end up in landfill causing severe environmental impact and loss of valuable resources like silver, copper, aluminium, and silicon. Recovery of silver from waste solar panels is of particular interest as silver is a fast depleting and valuable resource. In this work, c-Si EoL panels were collected and post removal of junction box and aluminium frames, the laminates were shredded to obtain required size grading. The crushed material was sieved and segregated into five size fractions (F1- F5). Analysis of XRD patterns confirmed presence of metals only in the portion below 300 μm (F4 & F5). The XRF analysis confirmed 0.85 wt% of silver in the metal rich fines (<150 μm). A lab-scale process was developed to recover silver from the metal rich fraction (F5) by leaching with Nitric acid. Acid concentration of 6 M HNO₃, leaching time 60 min and temperature 60 °C were established as the optimum conditions for complete recovery of silver from the fines. The proposed process for recovery of silver can provide an economic incentive to the solar waste recycling process, as it is focused on fines (comprising of 5 % of the crushed laminates). This approach cuts down the processing and transportation cost of recycling EoL solar panels, validating the commercial viability of the size fraction based approach.

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通过化学处理太阳能电池板废料中的富金属碎屑实现可持续银回收

太阳能光伏发电在全球范围内迅速发展，同时也产生了大量报废太阳能电池板。由于缺乏明确的废旧太阳能电池板回收战略，大部分废旧太阳能电池板最终将被填埋，造成严重的环境影响和银、铜、铝和硅等宝贵资源的损失。由于银是一种快速消耗的宝贵资源，因此从废弃太阳能电池板中回收银尤其令人感兴趣。在这项工作中，收集了晶体硅 EoL 面板，在去除接线盒和铝框之后，将层压板粉碎，以获得所需的尺寸等级。粉碎后的材料经过筛分，分成五个粒度等级（F1- F5）。X 射线衍射图分析证实，只有 300 μm 以下的部分（F4 & F5）存在金属。XRF 分析证实，在富含金属的细粒（150 μm）中，银的含量为 0.85 wt%。开发了一种实验室规模的工艺，通过硝酸浸出从富含金属的部分（F5）中回收银。酸浓度为 6 M HNO3，浸出时间为 60 分钟，温度为 60 °C，这些条件被确定为从碎屑中完全回收银的最佳条件。所建议的银回收工艺可为太阳能废料回收工艺提供经济激励，因为该工艺的重点是细料（占压碎层压板的 5%）。这种方法降低了回收易损太阳能电池板的加工和运输成本，验证了基于尺寸分数方法的商业可行性。

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来源期刊

Solar Energy Materials and Solar Cells 工程技术-材料科学：综合

CiteScore

12.60

自引率

11.60%

发文量

513

审稿时长

47 days

期刊介绍： Solar Energy Materials & Solar Cells is intended as a vehicle for the dissemination of research results on materials science and technology related to photovoltaic, photothermal and photoelectrochemical solar energy conversion. Materials science is taken in the broadest possible sense and encompasses physics, chemistry, optics, materials fabrication and analysis for all types of materials.