关键词: 重选, 筛分, 螺旋溜槽, 环形摇床, 直线振动筛

Abstract: A blast furnace dust with particle size of 0.074 mm or below accounts for 70.30%，and the valuable components of iron，carbon，zinc，iron in the 0.074 mm grain size have obvious enrichment phenomenon; Zinc is mainly distributed in the 0.065 mm grain size or below; The rougher the particle size is，the higher the carbon distribution is.Mineral processing tests on the sample were carried out，and the results indicated that under grinding fineness of 85% passing 200 mesh，iron concentrate with iron grade of 57.40％ and recovery of 47.08％，the carbon powder with grade of 67.18% and recovery of 63.09％，and the zinc-enriched material with zinc grade of 6.04％and recovery of 74.47％ were obtained by adopting the process of spiral chute for roughing，annular tabling for rough concentrate，spiral chute for screening rough tailings.On the basis of the test process，the production process was adopted to handle the blast furnace dust with iron content of 31.50%，carbon content of 31.50% and zinc content of 2.46%.In the case of grinding fineness of 85% passing 200 mesh，iron concentrate with iron grade of 55.30%，and recovery rate of 53.72%，the carbon powder with grade of 67.81%，and recovery rate of 60.76%，the zinc-enriched material with zinc grade of 5.81％and recovery of 74.18％ were obtained separately.The quality of iron concentrate，carbon powder and zinc-enriched material all meet the requirements of returning to the factory or is used as product sales.This process has features of low cost and high efficiency in handling the blast furnace dust with a promotion and application value.

Key words: Gravity, Separation, Spiral chute, Annular tabling, Linear vibrating screen