Synthesis of α-Fe2O3 Superfine Powders with Steel Pickling Waste Water and Dust Water in the Production of Bleaching PowderLi Chen, Xuemin Zu, Dandan Li and XingYao WangMATEC Web Conf., 67 (2016) 05024DOI: https://doi.org/10.1051/matecconf/20166705024