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author:

GUO, H. (GUO, H..) [1] | YU, H.-Z. (YU, H.-Z..) [2] | ZHOU, A.-A. (ZHOU, A.-A..) [3] | LÜ, M.-H. (LÜ, M.-H..) [4] | WANG, Q. (WANG, Q..) [5] | KUANG, G. (KUANG, G..) [6] | WANG, H.-D. (WANG, H.-D..) [7]

Indexed by:

Scopus CSCD

Abstract:

An enhanced leaching of Li from α-spodumene was carried out using a mixture of hydrofluoric and sulfuric acid (HF/H 2 SO 4 ) as the medium. Based on the optimized leaching conditions, the leaching kinetics of Li was investigated in an ore/HF/H 2 SO 4 ratio of 1:3:2 g:mL:mL with leaching temperature ranging from 50 to 100 °C. The results indicate that the leaching kinetics of Li fitted well with a model based on the shrinking core model. In addition, the leaching rate of Li was controlled by chemical reactions and diffusion through the product layers. The apparent activation energy E a was calculated to be 32.68 kJ/mol. Solid films were formed because of the generation of insoluble products such as cryolithionite (Na 3 Li 2 Al 2 F 12 ), cryolite (Na 3 AlF 6 ), calcium fluoride (CaF 2 ), potassium cryolite (K 2 AlF 5 ), aluminum fluoride (AlF 3 ), and fluorosilicates (Na 2 SiF 6 or KNaSiF 6 ). Furthermore, the effects of the ore/HF ratio and leaching temperature on the leaching behavior of Li, Al and Si were investigated. The results indicate that the ore/HF ratio and leaching temperature could clearly affect the distribution of HF molecules on the leaching of Li, Al and Si, which are important for the selective leaching of Li over Al and Si with this fluorine-based chemical method. © 2019 The Nonferrous Metals Society of China

Keyword:

fluorine-based chemical method; hydrofluoric acid; leaching kinetics; lithium extraction; α-spodumene

Community:

  • [ 1 ] [GUO, H.]School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China
  • [ 2 ] [GUO, H.]Institute of Chemical Technologies, College of Chemical Engineering, Fuzhou University, Fuzhou, 350108, China
  • [ 3 ] [GUO, H.]Department of Chemical Engineering, University of Louisiana at Lafayette, Lafayette, 70504, United States
  • [ 4 ] [YU, H.-Z.]School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China
  • [ 5 ] [ZHOU, A.-A.]School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China
  • [ 6 ] [LÜ, M.-H.]School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China
  • [ 7 ] [WANG, Q.]School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China
  • [ 8 ] [KUANG, G.]Institute of Chemical Technologies, College of Chemical Engineering, Fuzhou University, Fuzhou, 350108, China
  • [ 9 ] [WANG, H.-D.]School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China

Reprint 's Address:

  • [WANG, H.-D.]School of Minerals Processing and Bioengineering, Central South UniversityChina

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Source :

Transactions of Nonferrous Metals Society of China (English Edition)

ISSN: 1003-6326

Year: 2019

Issue: 2

Volume: 29

Page: 407-415

2 . 6 1 5

JCR@2019

4 . 7 0 0

JCR@2023

ESI HC Threshold:236

CAS Journal Grade:2

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 44

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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