Comprehensive recovery of tantalum and niobium from tantalum-niobium residue

被引：0
作者：
Wang, Jiajun [1 ]
Wang, Xiaohui [2 ]
Zhang, Ying [2 ]
Zheng, Shili [2 ]
机构：
[1] School of Chemical and Environment Engineering, China University of Mining and Technology (Beijing), Beijing
[2] Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Science, Beijing
来源：
Xiyou Jinshu/Chinese Journal of Rare Metals | 2015年 / 39卷 / 03期
关键词：
Enrichment; Recovery; Tantalum-niobium residue; Transformation leaching;
D O I：
10.13373/j.cnki.cjrm.2015.03.009
中图分类号：
学科分类号：
摘要：
A new technique of comprehensive recovery of tantalum and niobium from tantalum-niobium residue by hydrometallurgical process composed of low-alkali decomposition-poaching, diluted acid preprocessing and transformation leaching was studied. The optimal technical conditions were measured by experiments. The conditions of low-alkali decomposition-poaching were as follows: alkali-to-residue ratio of 0.6:1.0, reaction temperature of 800℃, reaction time of 1h, dosage of additive-NaCl of 12% of the residue, temperature in water leaching of 90℃, ratio of fluid to solid of 6:1 and leaching time of about 0.5 h. The conversion rates of tantalum and niobium in alkali decomposition transformation were 92.3% and 98.2%, respectively. By dilute acid pretreatment, most of the impurities were removed, and the enrichment of tantalum and niobium was nearly 5 times that of the original residue. The conditions of transformation leaching were as follows: dosages of sulfuric acid and hydrofluoric acid of 0.8 and 0.6 times the residue respectively, leaching temperature of 90℃, ratio of fluid to solid of 5:1 and leaching time of about 4 h. The leaching rates of tantalum and niobium in acid transformation leaching were 99.80% and 99.86%, respectively. The contents of tantalum and niobium in final residue dropped to 0.03% and 0.01%, respectively. Under the optimal conditions, an acid solution containing 9.50 g·L-1 Ta2O5 and 2.86 g·L-1 Nb2O5 could be obtained, which could match with the tantalum-niobium extraction and stripping technology in the production of tantalum-niobium industry and the recovery rates of tantalum and niobium could reach 98.37% and 99.15%, respectively. The new process had many advantages, such as simple process, mild operating conditions, low production cost, and remarkable social and economic benefits. ©, 2015, Editorial Office of Chinese Journal of Rare Metals. All right reserved.
引用
收藏
页码：251 / 261
页数：10
相关论文
共 16 条
  • [1] Guo Q.W., Wang Z.X., Modern Niobium-Tantalum Metallurgy, (2009)
  • [2] Cheng Z., Wu X.Q., Yang P.W., The characteristics of Ta-Nb resources and its beneficiation technology, Metal Mine, 7, (2013)
  • [3] Li S.W., Current situation of tantalum-niobium resource and production in world, China Nonferrous Metallurgy, 1, (2008)
  • [4] Ren Q., Zhang J.Z., Zhao C.H., Separating methods and resource present situation of tantalum and niobium, Hydrometallurgy of China, 25, 2, (2006)
  • [5] Zhou H.M., Zheng S.L., Zhang Y., Technology survey and development tendency investigation on tantalum-niobium hydrometallurgical extraction, Modern Chemical Industry, 25, 4, (2005)
  • [6] He J.L., Zhang Z.G., Xu Z.T., Hydrometallurgical extraction of Ta & Nb in China, Rare Metal Materials and Engineering, 27, 1, (1998)
  • [7] Cao Z., Cao Y.D., Li J., Qu Q.L., Wang J.L., Hydrometallurgy research status of rare earth and associated niobium, Metal Mine, 1, (2013)
  • [8] Zhu S.B., The research about enrichment of tantalum from tin residue and low-grade tantalum-niobium ore, China Nonferrous Metallurgy, 8, (1982)
  • [9] Xiao J.H., Fan S.P., Wang Z., Xu L.H., Comprehensive utilization research on polymetallic tailings with copper, tin and iron in Yunnan, Chinese Journal of Rare Metals, 37, 6, (2013)
  • [10] Dai Y.Y., Zhong H., Zhong H.Y., Recovery of tantalum and niobium from tungsten residue by alkali fusing, Nonferrous Metals, 61, 3, (2009)
12