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Self-stabilisation of high-temperature calcined electrolytic manganese residue in mortar
Highlights A method of electrolytic manganese slag (EMR) resource utilization was proposed. Almost all ammonia nitrogen in EMR is recovered by high-temperature calcination. Manganese in EMR can be stably cured in cement-based materials. The toxic leaching results of EMR after resource utilization were consistent with GB8978-1996.
Abstract High temperature calcination and mechanical ball milling are the most effective methods for increasing the volcanic ash activity of electrolytic manganese residues (EMR) and pretreating hazardous substances (NH3-N and Mn2+). In this study, the effects of different calcination temperatures (200, 400, 600, 800, and 1000 °C) and different EMR dosages (10, 15, and 20 %) on the mechanical properties, microscopic properties, and leaching toxicity of mortar were investigated. The results showed that the compressive strength of the prepared mortar mixture at different ages increased by 13.14 % to 24.5 % at a calcination temperature of 800 °C and dosage of 10 % EMR. Microscopic tests were performed to characterise the distribution of ettringite and calcium silicate hydrate gels on the surface of the mixed mortar. X-ray photoelectron spectroscopy and leaching toxicity analysis revealed the presence of EMR in the form of CaSiO3, MnO(OH)2, and M−NH4 +. The leaching toxicity of Mn2+ and NH3-N in the EMR-blended mortar was significantly lower than the emission standards. The use of EMR in construction materials assists in resource utilisation and environmental protection.
Self-stabilisation of high-temperature calcined electrolytic manganese residue in mortar
Highlights A method of electrolytic manganese slag (EMR) resource utilization was proposed. Almost all ammonia nitrogen in EMR is recovered by high-temperature calcination. Manganese in EMR can be stably cured in cement-based materials. The toxic leaching results of EMR after resource utilization were consistent with GB8978-1996.
Abstract High temperature calcination and mechanical ball milling are the most effective methods for increasing the volcanic ash activity of electrolytic manganese residues (EMR) and pretreating hazardous substances (NH3-N and Mn2+). In this study, the effects of different calcination temperatures (200, 400, 600, 800, and 1000 °C) and different EMR dosages (10, 15, and 20 %) on the mechanical properties, microscopic properties, and leaching toxicity of mortar were investigated. The results showed that the compressive strength of the prepared mortar mixture at different ages increased by 13.14 % to 24.5 % at a calcination temperature of 800 °C and dosage of 10 % EMR. Microscopic tests were performed to characterise the distribution of ettringite and calcium silicate hydrate gels on the surface of the mixed mortar. X-ray photoelectron spectroscopy and leaching toxicity analysis revealed the presence of EMR in the form of CaSiO3, MnO(OH)2, and M−NH4 +. The leaching toxicity of Mn2+ and NH3-N in the EMR-blended mortar was significantly lower than the emission standards. The use of EMR in construction materials assists in resource utilisation and environmental protection.
Self-stabilisation of high-temperature calcined electrolytic manganese residue in mortar
Fu, Yong (author) / Qiao, Hongxia (author) / Feng, Qiong (author) / Chen, Kefan (author) / Li, Yanqi (author) / Jia, Zhenyu (author)
2023-04-14
Article (Journal)
Electronic Resource
English
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