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Li, W., Li, Y., Xiao, Q., Wei, Z., & Song, S. (2018). The Influencing Mechanisms of Sodium Hexametaphosphate on Chalcopyrite Flotation in the Presence of MgCl2 and CaCl2. Minerals, 8(4), 150. doi:10.3390/min8040150 
10.3390/MIN8040150