NOUFERROUS METALLURGICAL EQUIPMENT

A copper-containing hazardous waste treatment project in Guangxi is required to dispose the As2O3-containing offgas from converting while removing dioxins. To address this environmental requirement, the design of the process combines the dry arsenic collection technology of “quenching+bag-filtering arsenic collection” and the dioxin removal technology of “quenching+activated carbon absorption”. Hence, the coupled process scheme of “quenching/deacification+activated carbon absorption+bag-filtering arsenic collection” is proposed in this paper to treat complex offgas. Since the dew point temperature of offgas is around 150-165℃, close to the required quenching outlet temperature of 170℃, the quenching/deacidification tower is proposed in the design. By spraying in lime slurry through a high-speed centrifugal atomizer, the offgas is quenched while SO3 is removed thus reducing the dew point of the offgas and avoiding pipes and equipment from corrosion. Finally, based on the possible issues in field operation, the coupled process operation is briefly discussed in regard to auxiliary devices, such as the temperature controller, flue cold-blast valve, and atomizer self-cleaning device.