Effect of slag composition on desulfurization during recycling rejected electrolytic manganese metal by electroslag remelting

IF 0.9 4区 材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING Metallurgical Research & Technology Pub Date : 2021-01-01 DOI:10.1051/METAL/2021019
Yu Liu, Guangqiang Li, Qiang Wang, Ru Lu, Xijie Wang, Yufeng Tian
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引用次数: 1

Abstract

To reduce the Mn vaporization during recycling rejected electrolytic manganese metal by electroslag remelting, it is proposed to reduce the temperature of molten slag pool, but which leads to the degradation of slag desulfurization. The desulfurization by interaction between CaF2 –CaO–Al2 O3 –Na2 O slag and rejected electrolytic manganese metal scrap was studied from the view of thermodynamics in this study. The results show that sulfur distribution ratio decreases with increase of CaF2 content, and increases with the increase of Na2 O content and temperature. Na2 O increases sulfur distribution ratio of slag by increasing CaO activity. Na2 O addition in CaF2 –CaO–Al2 O3 –Na2 O slag can enhance desulfurization ability of slag due to the larger sulfur distribution ratio and lower viscosity. Thus, sulfur content in test of slag T3 bearing 45.8 wt% CaF2 -23.2 wt% CaO-22.7 wt% Al2 O3 -8.3 wt% Na2 O is much lower than that of slag without Na2 O, implying that 45.8 wt% CaF2 -23.2 wt% CaO-22.7 wt% Al2 O3 -8.3 wt%Na2 O slag is the promising slag for recycling rejected electrolytic manganese metal by ESR.
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电渣重熔回收废电解金属锰过程中渣成分对脱硫的影响
为了减少电渣重熔回收废弃电解金属锰时Mn的汽化,提出降低熔渣池温度,但这会导致炉渣脱硫的退化。从热力学的角度研究了CaF2 - cao - al2o3 - na2o渣与废电解金属锰的相互作用脱硫。结果表明:硫的分布比随CaF2含量的增加而减小,随na2o含量的增加和温度的升高而增大;na2o通过提高CaO活性来提高炉渣硫的分配比。在CaF2 - cao - al2o3 - na2o渣中添加na2o,由于硫的分布比较大,粘度较低,可以提高渣的脱硫能力。由此可见,含45.8 wt% CaF2 -23.2 wt% CaO-22.7 wt% al2o3 -8.3 wt% na2o的T3渣的硫含量远低于不含na2o的渣,表明45.8 wt% CaF2 -23.2 wt% CaO-22.7 wt% al2o3 -8.3 wt% na2o的渣是电渣法回收废弃电解金属锰的理想渣。
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来源期刊
Metallurgical Research & Technology
Metallurgical Research & Technology METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
1.70
自引率
9.10%
发文量
65
审稿时长
4.4 months
期刊介绍: Metallurgical Research and Technology (MRT) is a peer-reviewed bi-monthly journal publishing original high-quality research papers in areas ranging from process metallurgy to metal product properties and applications of ferrous and non-ferrous metals and alloys, including light-metals. It covers also the materials involved in the metal processing as ores, refractories and slags. The journal is listed in the citation index Web of Science and has an Impact Factor. It is highly concerned by the technological innovation as a support of the metallurgical industry at a time when it has to tackle severe challenges like energy, raw materials, sustainability, environment... Strengthening and enhancing the dialogue between science and industry is at the heart of the scope of MRT. This is why it welcomes manuscripts focusing on industrial practice, as well as basic metallurgical knowledge or review articles.
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