@article{shi_jiang_nie_li_chang_zhu_2022, title={Innovative method for removing bromine in waste printed circuit boards: Ultrafine milling and porous media loaded debromination agent}, volume={33}, ISSN={["1568-5527"]}, DOI={10.1016/j.apt.2022.103662}, abstractNote={Resin is the main harmful substance in waste printed circuit boards (WPCBs) due to the presence of harmful bromine. In this study, the methods of ultrafine milling of resin and loading debromination agent on porous gasification slag were proposed to improve the debromination effect. The morphology, composition and phase of the gasification slag and resin were analyzed by scanning electron microscope (SEM) and X-ray diffractometer (XRD). The results show that the residual carbon in the gasification slag has porous structure, which contributes to the loading of debromination agent. The specific surface area and porosity of gasification slag before and after acid treatment were analyzed by BET. Using the porous properties of gasification slag, different debromination agents were attached to prepare efficient debromination agents, which were adopted for thermal debromination of resin in WPCBs. Subsequently, ICP-MS was used to determine the content of bromine in pyrolysis residue. The results show that when FeCl2/FeCl3 was used as the debromination agent, the debromination efficiency was only 67.19% and 58.29%, while using gasification slag-FeCl2/FeCl3 composite, the debromination efficiency can be increased to 81.63% and 76.25%. Therefore, the cooperative treatment can realize the resource utilization of the two wastes.}, number={8}, journal={ADVANCED POWDER TECHNOLOGY}, author={Shi, Shun -Xiang and Jiang, Si-Qi and Nie, Chun -Chen and Li, Biao and Chang, Hong-Hao and Zhu, Xiang -Nan}, year={2022}, month={Aug} }
 @article{shi_jiang_nie_li_chang_zhu_2022, title={Kinetic characteristics and mechanism of copper leaching from waste printed circuit boards by environmental friendly leaching system}, volume={166}, ISSN={["1744-3598"]}, DOI={10.1016/j.psep.2022.07.063}, abstractNote={Copper is one of the most important valuable elements in waste printed circuit boards (WPCBs), which can be finally recovered by hydrometallurgy. Environmentally-friendly copper leaching technology has become critical. In this study, two environmentally friendly leaching systems, namely ammonia-ammonium chloride leaching system and glycine-hydrogen peroxide leaching system, on copper leaching behavior was concerned, the influence of leaching time and leaching agent concentration on leaching rate of copper concentrate with different size was revealed. In addition, a simple but effective leaching kinetics model were proposed. The results show that with the extension of time, the leaching rate increases rapidly at first (0–10 min) and then slowly (10–25 min) until stable. The optimum leaching concentration of ammonia is 3 mol/L. For ammonia leaching system, the leaching rate increased from 76.92% to 90.05% with the decrease of particle size. Meanwhile, the leaching rate increased from 77.32% to 87.93% in the glycine leaching system. Finer particles have a larger contact area, resulting in higher leaching rates. The simple leaching kinetics model proposed in this study can accurately describe the leaching process of copper. These two environmentally friendly leaching systems can be used as substitutes for traditional inorganic acids.}, journal={PROCESS SAFETY AND ENVIRONMENTAL PROTECTION}, author={Shi, Shun-xiang and Jiang, Si-qi and Nie, Chun-chen and Li, Biao and Chang, Hong-hao and Zhu, Xiang-nan}, year={2022}, month={Oct}, pages={123–132} }
 @article{ni_zhou_gao_bu_chen_alheshibri_xie_li_2022, title={Selective comminution and grinding mechanisms of spent carbon anode from aluminum electrolysis using ball and rod mills}, volume={58}, ISSN={["2084-4735"]}, DOI={10.37190/ppmp/145667}, abstractNote={The recovery of spent carbon anode (SCA) materials plays important roles in environment protection and resources recycling, while this cannot be efficiently achieved without liberation. In this study, grinding characteristics of spent carbon anode from aluminum electrolysis in both ball mill and rod mill were analyzed, and compared based on the utilization of the selective Fuerstenau upgrading curves. In addition, the different grinding mechanisms of ball and rod milling were evaluated by analyzing the shape factor and surface roughness of the ground samples. Results of mineralogical characterizations indicated that carbon particles (d50 = 46.86 μm) presented in the SCA were closely associated with cryolite particles. At 5 min grinding time, the maximum selective comminution factor (β) values of ball milling and rod milling were 2.00 and 1.63, respectively, indicating a higher degree of selective comminution of SCA was achieved from ball milling. Comparisons of the valuable component content (cv, cum) of -125 μm ground particles and the shape characterizations of 74–125 μm ground particles generated from ball and rod milling manifest that a direct relationship exists between the degree of selective comminution and the grinding mechanism.}, number={3}, journal={PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING}, author={Ni, Chao and Zhou, Shaoqi and Gao, Jixuan and Bu, Xiangning and Chen, Yuran and Alheshibri, Muidh and Xie, Guangyuan and Li, Biao}, year={2022} }