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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 1    January 2020

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Kinetics of leaching lithium from lepidolite using mixture of hydrofluoric and sulfuric acid
WANG Hai-dong(王海东)1, ZHOU An-an(周安安)1, GUO Hui(郭慧)1, 2, Lü Meng-hua(吕梦华)1, YU Hai-zhao(余海钊)1

1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
2. School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China

Abstract:The fluorine-based chemical method shows great potential in leaching lithium (Li) from lepidolite. Leaching kinetics of Li in a mixture of sulfuric acid and hydrofluoric acid, which is a typical lixivant for the fluorine-based chemical method, was carried out under crucial factors such as different HF/ore ratios (1:1-3:1 g/mL) and leaching temperatures (50-85 °C). The kinetics data fit well with the developed shrinking-core model, indicating that the leaching rate of Li was controlled by the chemical reaction and inner diffusion at the beginning of leaching (0-30 min) as a calculated apparent activation energy (Ea) of 20.62 kJ/mol. The inner diffusion became the rate-limiting step as the leaching continues (60-180 min). Moreover, effects of HF/ore ratio and leaching temperature on selective leaching behavior of Li, Al and Si were discussed. 90% of fluorine mainly existed as HF/F- in leaching solution, which can provide theoretical guidance for further removal or recovery of F.

 

Key words: lepidolite; lithium extraction; fluorine-based chemical method; hydrofluoric acid; selective leaching; leaching kinetics

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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