China Nonferrous Metallurgy

The oxygen-enriched intensified smelting technology is used in the Double-Flash copper smelting process, the concentration of the enriched oxygen is usually controlled between 80% and 90% in the design. After the flash furnace of Guangxi Jinchuan Company was put into production, there were a series of issues such as high fuel consumption, high temperature of off-gas system, melting and caking of boiler soot, nozzle accretion, incomplete reaction, etc., which severely limit the uplifting of production efficiency. Aiming at these issues, the Company has improved the interlock control and valve automatic on/off for the air supply system, and the air flow guide components are added to the nozzle. With this improvement, the nozzle pure oxygen (enriched oxygen concentration 100%) smelting in Outokumpu flash furnace is realized, furthermore, the smelting control is more stable, the production capacity is increased accordingly, the production load of the smelting furnace is enhanced to 270 t/h (the designed maximum load is 246 t/h) and the production load of the converting furnace is enhanced to 100 t/h (the designed maximum load is 90 t/h). After the pure oxygen smelting in flash furnace, the self-thermal production is achieved for the double-furnace, which cuts fuel consumption and reduces carbon emission, and because the air consumption is lowered, there is less nitrogen entrainment, and the emission of nitrogen oxides is reduced.