Modern Mining ›› 2024, Vol. 40 ›› Issue (02): 173-175.
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In order to improve the comprehensive utilization rate of a low zinc blast furnace ash in
Tangshan and achieve the requirements of zinc powder into the kiln zinc grade of about 6%，the cyclone
classification separation + spiral separator separation test was carried out. The results show that: ①The blast
furnace ash with zinc grade of 1.75% was separated by one roughing one cleaning two-stage cyclone separa⁃
tion. Finally，zinc powder with zinc grade of 5.96% and 6.27%，zinc recovery of 47.10% and 44.21% were
obtained. ②For the underflow of the two-stage cyclone with yield of about 15%，the spiral separator is used
to separate iron and carbon. The iron grades of the inner ring products of the spiral separator are 47.76% and
48.98%，respectively，which can be used as low-grade iron products or incorporated into the underflow 1 to
carry out subsequent iron separation tests. The iron grade of the middle ring and outer ring products of the
spiral separator is about 34%，and the heat value is about 2 500 cal/ kg. The iron grade and heat are not
high，and the particle size is fine and the treatment is difficult. There is no significance of reprocessing or as
a separate product. The study determined the ideal zinc recovery process，which can be used as the basis for
development and utilization.
