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This retrofit of flue gas emissions during the aluminum electrolysis process is more environmentally friendly.
2026-03-10
Recently, the Jiajuguan Electrolysis Unit No. 3 of Dongxing Aluminum Company, part of the Jiugang Group, completed a retrofit of the exhaust port on the aluminum‑pouring ladle ejector. This modification effectively directs flue gases into the cell and recirculates them to the purification system, significantly improving the on‑site working environment and making the aluminum‑pouring process more economical and environmentally friendly.
During the aluminum tapping operation at the electrolytic production site, high‑velocity compressed air discharged from the ejector carries away the air inside the vacuum‑tapped ladle. The exhaust stream contains aluminum dust and other fumes, which not only pollute the plant’s working environment but also pose health risks to the operators. Consequently, effectively controlling and eliminating the fumes emitted by the ejector during tapping has become a persistent technical challenge for this operational area.
Since July, the management and technical personnel of this operating area, guided by the working principle of vacuum aluminum tapping, have pooled their expertise and conducted repeated verifications to identify the root cause of the substantial smoke emissions into the plant during the tapping process. Based on this insight, they designed and fabricated an exhaust‑gas diversion pipe. The pipe consists of two sections: a DN80 seamless steel pipe and a rubber hose, with an angle‑iron bracket at the right‑angle bend. During installation, the diversion pipe is welded to the vacuum tapping ladle at the bracket; during aluminum tapping, the exhaust gases are routed directly through the pipe to the electrolytic cell and then conveyed to the purification system via the cell’s negative pressure for fume extraction.
It is reported that, following more than two months of testing and implementation, the modification to the exhaust port of the aluminum‑pouring ladle ejector has had no adverse impact on the aluminum‑pouring process. Moreover, the solution is low‑cost, economical, and practical, making the aluminum‑pouring operation both more environmentally friendly and more efficient.
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