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Major smelting and refining produces metals directly from ore concentrates, whereas secondary smelting and refining produces metals from scrap and process waste. Hao-Jie Cui, Jie-Kui Cai, Jian-Wen Shi, Baoling Yuan, Cui-Ling Ai, Ming-Lai Fu. Fabrication of 3D porous Mn doped α-Fe2O3 nanostructures for the removal of heavy metals from wastewater. Water, Air, & Soil Pollution 2014, 225 (1) DOI: 10.1007/s11270-013-1816-6.

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