China Nonferrous Metallurgy

Daye Nonferrous Metals Smelter adopts oxygen-enriched top-blowing smelting technology on Ausmelt furnace, and the overall process control is very mature. Increasing the operating rate of the Austrian furnace is the only way to increase production capacity. The smelter analyzed the shutdown failures in 2018 and found that boiler failure, spray gun failure and replacement, coking and stacking, air and coal supply system failures, and cleaning the spray gun weight are the key factors affecting the internal shutdown of the Austrian furnace, and the ratio reached 82.67%. Measures such as strict control of boiler water quality and strengthening of daily maintenance have reduced the failure rate of boilers; improving spray gun structure to increase spray gun life; measures such as regular cleaning of flue working door coke blocks, using coking inhibitors, and improving coking operation techniques to reduce the flue coke; measures such as switching to nitrogen for instrument air and improving steam drum drainage valves to reduce fan failures; strengthening maintenance to reduce the failure rate of the pulverized coal system; refining operation to reduce the frequency of cleaning spray guns. After the above measures are taken, Daye Nonferrous Ausmelt furnace's annual system operating rate in 2019 reached 95.5%, which is an increase of 1.8% from 93.7% in 2018, and the annual output of copper reached 326000 tons. The effect is remarkable.