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This retrofit of flue gas emissions from the aluminum electrolysis process is more environmentally friendly.
2026-03-10
Recently, the Jiajuguan Electrolysis Unit No. 3 of Dongxing Aluminum Company under Jiugang Group completed an upgrade to the exhaust outlet of the aluminum-billet-lifting ladle ejector, effectively directing flue gases into the electrolytic cells and recirculating them to the purification system. This significantly improved the on-site working environment within the plant, making the aluminum-billet tapping operation more economical and environmentally friendly.
During the aluminum tapping operation at the electrolytic production site, high-velocity compressed air is used by an ejector to discharge the air inside the vacuum aluminum-tapping ladle. The exhaust air contains aluminum dust and other fumes, which not only pollute the workshop environment but also pose certain health risks to the operating personnel. Consequently, effectively controlling and eliminating the fumes discharged by the ejector during the aluminum-tapping process has become a vexing technical challenge for this operational area.
Since July, the management and technical personnel of this operating area, based on the working principle of vacuum aluminum tapping from the ladle, have pooled their ideas and conducted repeated verification to identify the root cause of the substantial emission of flue gas into the plant building during the aluminum-tapping process. In response, they designed and fabricated an exhaust-gas diversion duct, which consists of a DN80 seamless steel pipe and a rubber hose, with an angle-iron support bracket installed at the right-angle bend. During installation, the diversion duct is welded to the vacuum aluminum-tapping ladle at the angle-iron bracket; when aluminum is tapped, the exhaust gases are directed through the duct straight to the electrolytic cells and then drawn by the negative pressure generated in the cells to the purification system.
According to reports, after more than two months of trials and wider implementation, the modification of the exhaust port on the aluminum-discharge ladle ejector in this operating area has had no adverse impact on the aluminum-discharge process. Moreover, the modification is low-cost, economical, and practical, thereby making the aluminum-discharge operation more environmentally friendly and efficient.
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