Sustainable Mining and Metallurgy

Taking the dry arsenic collection technology of oxygen-enriched side-blown smelting flue gas of As-bearing gold-copper concentrate as the research object, the effects of sulfur trioxide content in flue gas, spray gun layout of quench tower, effective height of quench tower and inlet temperature of bag collector on dry arsenic recovery were analyzed, and the related technical control difficulties were studied. Sulfur trioxide content in flue gas can be controlled by controlling oxygen content ; cancelling the top spray gun of the quench tower, and increasing two spray guns in the tower body can effectively cool the flue gas ; by increasing the height of the quench tower, the residence time of the absorbent in the quench tower can be prolonged to make it completely vaporized. By controlling the spraying amount of the absorbent of the spray gun in the quench tower, the inlet temperature of the bag filter can be maintained at 150-170℃. The above measures have been successfully applied to production practice. At present, this system under stable operation treats 1900t/d ore feed with As grade of 1.5% and collects 23t/d As. The As content in purified dilute acid from acid-making section drops from 18000mg/L to 4000mg/L. Resistance of primary high-efficiency scrubber used in purification procedure decreases by around 2000Pa and the filter press residue of dilute acid dramatically declines.