METHOD OF CONTROLLING GAS MODE FOR CONVERSION IN NON-FERROUS METALLURGY Russian patent published in 2002 - IPC

FIELD: non-ferrous metallurgy. SUBSTANCE: method involves controlling flow rate of air supplied into each converter for purging matte; controlling vacuum extent in dust chambers and gas temperature at outlets of converter dust chambers; calculating content of sulfur dioxide in gases of each converter as function of controllable parameters and calculating optimal vacuum in gas ducts of each converter and maximal content of sulfur dioxide in gases for limited discharge of gases into atmosphere through gaps in gas tract and restricting gas temperature upstream of exhaust fan; regulating vacuum extent in converter gas tracts by changing rotational frequency of exhaust fans and directing gases rich in sulfur dioxide to sulfuric acid producing house and the remainder to smoke stack. As a result, content of sulfur dioxide in gases delivered for sulfuric acid production is increased from 1.5-2% to 3-5%, increase in effectiveness reaches 30-40%, power consumed by electric engines of exhaust fans is reduced due to replacement of throttling by regulation of exhaust fan rotational frequency. Method is used for reprocessing of copper, nickel and copper-nickel mattes in non-ferrous metallurgical houses. EFFECT: reduced outbursts of converter gases into atmosphere of house from below converter dust chambers and provision for reprocessing of gases with increased concentration of sulfur in sulfuric acid production. 1 dwg