Feasibility Study on Iron-carbon Separation and Zinc Selection from Low Zinc Blast Furnace Ash
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.
blast furnace ashlow zinc contentcomprehensive treatment and reusehydrocyclonespiral separator
NETL
NSTL
万方数据
