High-value resource utilization of polyaluminum chloride residue for the preparation of polyaluminum chloride and magnesium aluminate spinel: Efficient conversion strategy for inert components and techno-economic analysis - Junjie Xin; Guangtao Wei; Ni Wang; Suqi Luo; Ziquan Zhong; Yi Zhang; Linye Zhang; Chenglong Nong (Journal of Environmental Chemical Engineering, 2026)