关键词: 低品位氧化铅锌矿, 还原焙烧, 回转窑, 回收

Abstract: 'The existing lead-zinc oxide mines in a certain place are characterized by large reserves , lowgrades, complex mineral compositions , and difieulty in exerting economic benelits. To study the reduc-tion and volatilization laws of low-grade zinc oxide ores, the chemical compositions, occurrence states,.and miero-morphologies of raw materials and produets were analyzed one by one, and the thermodynamicbehavior of the reduction roasting process was discussed. The production process flow of ore blending( adding 2596 reduction coal ) , granulation, drying, reduction roasting, and water quenching was deter-mined through experimental exploration. The Zn vapor volatilized during the reduction roasting processwas cooled and collected in the dust, among which the boiler dust contained an average of 29. 49% 2n,the surface-cooled dust contained an average of 42. 94%6 Zn, and the bag dust contained an average of60. 93%6 Zn. XRD was used to conduet comparative analysis on raw materials and slag, and the resultsshowed that the phases of Zn and Pb in the slag disappeared, indicating that the rotary kiln reductionroasting process can elfeetively volatilize Zn and Pb elements from the raw materials. Through materialbalance calculations, it was found that the total recovery rate of Zn reached 97. 18%6 and the reeoveryrate of Ph reached 96. 30%6 during the industrial experiment of rotary kiln reduction roasting, efficientlyachieving the effective utilization of secondary resources.

Key words:  , low-grade lead-zinc oxide ore , reduction roasting, rotary kiln , recovery