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- Title
Damage mechanism of magnesia-chrome refractories for side-blown copper smelting fumace.
- Authors
Fu Qiqi; Zhong Lihua; Bai Wenxian; Gan Yongtong; Deng Junjie
- Abstract
In order to ensure the safe and stable operation of the side-blown furnace adopting new process, the corrosion damage mechanism of the magnesia-chrome brick of the side wall at the slag line in a side-blown copper smelting furnace was researched using a scanning electron microscope and an energy dispersive spectrometer. The results show that: (1) the magnesia-chrome bricks located at the slag line undergo alternating corrosion and infiltration of copper matte and slag, which is hardly to form a stable slag layer, resulting in a continuous cycle of infiltration-corrosion-spalling of magnesia-chrome bricks and the severest corrosion;the corrosion of the magnesia-chrome bricks above the slag line is slight, because the infiltration of copper matte in the bricks is obviously weaken, and a stable spinel and olivine dense layer is formed on the hot surface of the bricks, serving as a barrier against further penetration and corrosion of slag and copper matte to a certain extent; (2) although copper matte only penetrates along the pores and grain boundaries in magnesia-chrome bricks without participating in the corrosion reaction, it penetrates and wraps the matrix particles or grains, disrupting the direct bonding of magnesia-chrome bricks, destroying the stable structure of the original magnesia-chrome bricks and consequently reducing their resistance to slag and copper matte; (3) the copper matte primarily penetrates along the chromite particles, and gaps between periclase crystals after the precipitation of iron-rich spinel, which is disadvantageous for the resistance of magnesia-chrome bricks to the penetration and corrosion of SiO2-FeO slag.
- Subjects
COPPER smelting; OLIVINE; COPPER slag; SMELTING furnaces; SCANNING electron microscopes; COPPER corrosion; COPPER
- Publication
Refractories / Naihuo Cailiao, 2024, Vol 58, Issue 2, p148
- ISSN
1001-1935
- Publication type
Article
- DOI
10.3969/j.issn.1001-1935.2024.02.011