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Metal Mine ›› 2015, Vol. 44 ›› Issue (12): 169-172.

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Recovery of Iron from Gold Smelting Slag from Henan by Direct Reduction Roasting-Low Intensity Magnetic Separation Process

Wang Wei1,2，Liu Lin1,2,3，Feng Ansheng1,2，Liu Hongzhao1,2，Gao Zhaoguo1,2   

  1. 1.Zhengzhou Institute of Multipurpose Utilization of Mineral Resources,Chinese Academy of Gedogical Sciences,Zhengzhou 450006,China；2.Comprehensive Utilization Key Laboratory of Gold Resource in Henan Province，Zhengzhou 450006,China；3.Graduate Department of Chinese Academy Geological Sciences,Beijing 100037,China
  • Online:2015-12-15 Published:2016-03-09

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Abstract: There is 27.24% iron in a gold smelting slag from Henan Province.The iron in the slag mainly exists in the form of hematite.Direct reduction roasting-low intensity magnetic separation process was conducted on the slag to recovery iron from this gold smelting slag.The results showed while the dosage of reducing agent is 15%，dosage of calcium oxide is 5%，roasting temperature is 1 150 ℃，roasting time is 80 min，and then ground the roasted product to -0.045 mm accounted for 75%，magnetic field intensity is 60 kA/m，the iron concentrate with iron grade of 91.4% and iron recovery of 79.5% can be obtained，high efficiently recovery of iron in slag was realized.

Key words: Gold smelting slag, Direct reduction roasting, Low intensity magnetic separation, Calcium oxide