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Metal Mine ›› 2016, Vol. 45 ›› Issue (02): 99-102.

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Reconcentration Purification Experiment on Rare Earth Concentrate in Baiyan Obo

Zhu Yongtao1,2，Li Mei1，Gao Kai1,3，Zhang Dongliang1,3，Li Xiaolei1,2，Yan Yi1,2   

  1. 1.Key Laboratory of Inner Mongolia Autonomous on New Technologies of Modern Metallurgy and Application of Rare Earth，Baotou 014010,China；2.Mining Research Institute，Inner Mongolia University of Science and Technology，Baotou 014010,China；3.School of Materials Science and Engineering，Beijing University of Chemical Technology，Beijing 100029，China
  • Online:2016-02-15 Published:2016-03-11

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Abstract: There is 50.12% REO in a flotation concentrate of a plant in North Rare Earths Group in Baiyan Obo.Impurities composition CaO，Fe，F and SiO2 content is high，not only quality of the products but also rare earth recovery will relatively low when directly used for smelting.To provide quality raw materials for rare earth smelting technology upgrade，reconcentration purification tests were conducted.Results show that using NaOH as pH regulator，sodium silicate as depressor，LF8# as collector，via one roughing-three cleaning-two scavenging and middlings back to the flowsheet in turn closed cirouit flotation process，high quality rare earth concentrate with REO grade of 65.48% and recovery of 92.23% was obtained，meet quality demand of the subsequent rare earth smelting technology upgrade.

Key words: Rare earth, Purification on concentrate, Flotation