标题: Mechanochemical modification of electrolytic manganese residue: Ammonium nitrogen recycling, heavy metal solidification, and baking-free brick preparation

作者: Lan, JR (Lan, Jirong); Zhang, SS (Zhang, Shanshan); Mei, T (Mei, Tao); Dong, YQ (Dong, Yiqie); Hou, HB (Hou, Haobo)

来源出版物: JOURNAL OF CLEANER PRODUCTION 卷: 329 文献号: 129727 DOI: 10.1016/j.jclepro.2021.129727 出版年: DEC 20 2021

摘要: The increasing accumulation of electrolytic manganese residue (EMR) with high ammonium nitrogen and heavy metals has become the biggest obstacle restricting the sustainable development of electrolytic manganese industry. A novel method for efficient recovery of ammonium nitrogen as well as solidification of Mn and other heavy metals in the process of preparation of EMR based baking-free brick (B-EMR) was invented by mechanical milling in the coexistence of water and calcium oxide for the first time. It was demonstrated that the solidification/recovery efficiency of Mn and ammonium nitrogen can reach more than 98%. And the compressive of B-EMR was higher than 12 Mpa, which met the requirement of China's national industry standard of stronger than 9.6 Mpa (JC/T 239-2001). Mechanochemical action breaked the Si-O bond and promoted the calcium silicate-like cementitious structure, which contributed to the compressive strength of B-EMR and the solidification of heavy metals. CaO plays a key role in the conversion of ammonium nitrogen in EMR to NH3 and enhanced by mechanical milling. This study provided a feasible path for the resource disposal of EMR. And demonstrated a solution for the limitation of ammonium nitrogen and heavy metals in the large-scale utilization of EMR.

作者关键词: Mechanochemistry; Electrolytic manganese residue; Baking-free brick; Ammonium sulfate; Manganese ion

KeyWords Plus: RECOVERY; SLAG

地址: [Lan, Jirong; Zhang, Shanshan; Mei, Tao; Dong, Yiqie; Hou, Haobo] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

[Dong, Yiqie; Hou, Haobo] Wuhan Univ Zhaoqing, Resource & Environm Technol Res Inst, Zhaoqing 526200, Guangdong, Peoples R China.

通讯作者地址: Dong, YQ; Hou, HB (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

电子邮件地址: dongyiqie@whu.edu.cn; houhb@whu.edu.cn

影响因子：9.297