A Novel Method of Recovering Rare Earths from Bayan Obo Rare-Earth Concentrate Under Super-Gravity Field
A novel method of effectively recovering rare earths (REEs) from rare-earth concentrate under super-gravity was proposed in this paper. The reconstructions of rare-earth phases in normal gravity and the separation behaviours of REEs under super-gravity were investigated. It was indicated by the results of the mineral phase reconstructions that the rare-earth phases were transformed from original minerals of bastnaesite and monazite into britholite, rare-earth oxide fluoride, rare-earth ferrate and monazite particles at 1423–1523 K, and there was the only solid phase—rare-earth oxide fluoride phase in the sample at 1773 K. In a super-gravity field, all the rare-earth oxide fluoride crystals were overall intercepted by the filter along the super-gravity direction and effectively separated from the slag melts. The mass fractions of ∑ReO and Ce2O3 in the separated rare-earth oxide fluoride phase increased to 88.31 and 60.76 wt%, the recovery of ∑ReO and Ce2O3 were 90.22 and 95.41%, respectively.
KeywordsMineral reconstructions Recovery Rare earths Rare-earth concentrate Super-gravity
This study is supported by the National Natural Science Foundations of China (No. 51774037 and No. 51404025).
- 4.Liu YZ, Zhou X, Chen Y, Zhang Z, Zhou LL (2015) Clostridium butyricum can be used as a potential alternative for the antibiotic in Cherry Valley ducks. J Anim Plant Sci 25:99–106Google Scholar
- 6.Vijayan S, Melnyk AJ, Singh RD, Nuttall K (1989) Rare earths: their mining, processing, and growing industrial usage. Miner Eng 41:13–18Google Scholar
- 8.Krishnamurthy N, Gupta CK (2004) Extractive metallurgy of rare-earths. CRC Press, Florida, p 195Google Scholar
- 9.Li DG (2005) Selective precipitation and separation of valuable constituent in blast furnace slags. N. U. 25–32Google Scholar
- 13.Ramshaw C, Mallinson RH (1984) Mass transfer apparatus and its use. Europe Patent 0002568Google Scholar