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| Mineralogical analysis of rising flue slag in an oxygen-enriched double-side-blowing copper bath melting furnace |
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Received:March 16, 2024
Revised:April 24, 2024
Accepted:May 06, 2024
Published Online:March 24, 2025
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| DOI： |
| KeyWord:copper smelting; flue slag; soot; mineralogy |
| Author | Institution |
| ZHANG Min |
Engineering Research Center of Metallurgical Energy Conversion and Emission Reduction,Ministry of Education,Kunming University of Science and Technology;Yunnan,China;Southwest Copper Branch,Yunnan Copper Co,Ltd;Yunnan,China |
| KUANG Biao |
Engineering Research Center of Metallurgical Energy Conversion and Emission Reduction,Ministry of Education,Kunming University of Science and Technology |
| LI Dongbo |
Engineering Research Center of Metallurgical Energy Conversion and Emission Reduction,Ministry of Education,Kunming University of Science and Technology |
| HU Jianhang |
Engineering Research Center of Metallurgical Energy Conversion and Emission Reduction,Ministry of Education,Kunming University of Science and Technology |
| YANG Gui |
Southwest Copper Branch,Yunnan Copper Co,Ltd |
| YANG Peng |
Southwest Copper Branch,Yunnan Copper Co,Ltd |
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| Abstract: |
| Oxygen-enriched double-side-blowing copper melting pot smelting furnace rising flue soot slagging is serious, blocking the flue, which is a key factor restricting the production of high load and high operation rate of the smelting furnace for a long period of time. From the process mineralogy point of view, the chemical composition, physical phase composition and microscopic morphology of the rising flue slagging soot of the oxygen-rich double-side-blowing copper melting pot smelting furnace were investigated. The results show that the main elements of the rising flue dust are Fe, Cu, Pb, Zn and O, and the main phases are (Cu, Zn, Fe)Fe2O4 and Fe3O4, and the surface microscopic morphology is dense and poreless. Combined with the working conditions of the production process, the flue slagging causes were analyzed. Oxygen-enriched double-side-blowing copper melting pool melting furnace production process, through the nozzle of the oxygen-enriched air drum into the furnace, strongly stirring the melt. Molten air bubbles in the melt rupture and escape, spattering the formation of small particles of slag and ice copper is hot airflow into the rising flue, slag and ice copper is oxidized to a high melting point (Cu, Zn, Fe) Fe2O4 and Fe3O4, in the wall of the flue in the cold condensation to form slag. At the same time, the smelting furnace operating at negative pressure, into the furnace raw materials, low moisture, copper concentrate and other un-reacted powders are flue gas into the high-temperature section of the rising flue, in the oxidizing atmosphere to generate bonded slag reaction. In addition, raw materials such as Pb, Zn, As and other volatile substances into the flue, is oxidized to low melting point compounds and high melting point (Cu, Zn, Fe) Fe2O4 and Fe3O4 bonded together to form dense slag soot. Therefore, in smelting production, it is recommended to reduce the powder into the furnace by controlling the water and impurity content of raw materials into the furnace; controlling the slag type and melting temperature to reduce the melt spattering; and using the nozzle to burn the heavy oil to burn the slag fumes and dust, to ensure the normal and stable operation of the production. |
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