Guangshi Li, Xingli Zou*, Hongwei Cheng, Shuhua Geng, Xiaolu Xiong*, Qian Xu, Zhongfu Zhou, Xionggang Lu*. A Novel Ammonium Chloride Roasting Approach for the High-Efficiency Co-sulfation of Nickel, Cobalt, and Copper in Polymetallic Sulfide Minerals. Metallurgical and Materials Transactions B, 2020, 51, 2769–2784.