Waste printed circuit boards smelting ash (WPCBs-SA) is generated by the smelting process of waste printed circuit boards (WPCBs), which contains valuable metals, such as copper (Cu), zinc (Zn), and sliver (Ag), and a large amount of harmful bromide (Br^-). In this work, a facile sulfation roasting (SR) proposed for the removal of Br^- from WPCBs-SA with high efficiency. The thermodynamic analysis is systemically investigated, and the results demonstrate that Br^- in WPCBs-SA is converted into HBr or Br₂ comfortably below 564.8 K during the SR process. The influences of essential variables such as the ratio of sulfuric acid into smelting ash, roasting temperature and time are systematically investigated, and the variables are also optimized via response surface methodology (RSM). Under the optimized experimental conditions, the Br^- removal efficiency reached up to 98.97%, and the values of the three variables were 0.8 g/g, 590.04 K and 123.25 min, respectively. The proposed RSM model equation shows a good correlation with the experimental data, with a correlation coefficient (R²) of 96.05%. This work will be a new method to enrich the harmful elements of WPCBs-SA and reduce the potential environmental pollution of related hazardous wastes.

废印刷电路板熔炼灰（WPCBs-SA）是通过废印刷电路板（WPCB）的熔炼过程产生的，废印刷电路板（WPCB）包含有价值的金属，例如铜（Cu），锌（Zn）和银（Ag），以及大量的有害溴（溴^- ）。在这项工作中，一个浅显的硫酸化焙烧（SR）提出了去除的Br ^-从WPCBs-SA具有高效率。热力学分析全身调查，其结果表明，溴^-在WPCBs-SA被转换成的HBr或Br ₂在SR过程中舒适地低于564.8K。系统研究了诸如硫酸与熔融灰分的比例，焙烧温度和时间等基本变量的影响，并且还通过响应面方法（RSM）对这些变量进行了优化。在优化的实验条件下，溴^-去除效率达到高达98.97％，和三个变量的值分别为0.8克/克，590.04 K和分别123.25分钟，。提出的RSM模型方程与实验数据具有良好的相关性，相关系数（R ²）为96.05％。这项工作将成为一种新的方法，可以丰富WPCBs-SA的有害元素并减少相关危险废物的潜在环境污染。