Full
ZHANG Ningxuan (1995-), male, Master candidate. E-mail: zhangningxuan@xauat.edu.cn
Outline
Copper smelting anode slag and magnesia-chrome brick located in different parts of rotary anode furnace were characterized by X-ray fluorescence spectroscopy, X-ray diffraction reflection polarizing microscopy, scanning electron microscopy (SEM)-energy dispersive spectroscopy. The damage mechanism of magnesia-chrome brick was investigated. The results show that the damage index of the magnesia-chrome bricks at the end wall, cylinder and tuyere (redox opening) of the anode furnace in service for 8 months are 8.9%, 21.6%, and 55.1%, respectively. The end wall magnesia chrome brick is mainly eroded by silicate phase to form forsterite (Mg2SiO4), which forms a dense slag layer at the hot end of magnesia chrome brick, and hinders the erosion and penetration of molten copper and slag, leading to the minimum corrosion degree of magnesia chrome brick. The magnesia chrome brick of cylinder is corroded and penetrated by copper and cuprous oxide. The rotation of furnace and serious erosion and penetration increase the probability of structural spalling of magnesia chrome brick, and the degree of erosion is greater than that of end wall magnesia chrome brick. A high oxygen potential of the redox tuyere magnesia-chrome brick in the oxidation stage can suffer the greatest penetration of cuprous oxide. The alkaline flux sodium carbonate added during slagging has a more obvious aggravating effect on the erosion of the magnesia-chrome brick. Na2O from Na2CO3 decomposition reacts with part of the chromium spinel to form Na2Cr2O4, which destroys the direct bonding of magnesia-chrome bricks. In addition, the complex service environment such as melt erosion, turbulence, and reducing agent injection causes a frequent peeling of the redox tuyere magnesia-chrome brick structure with the maximum degree of corrosion.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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