Experimental and theoretical investigations on diffusion process for rare earth ores

Ye He; Wenzhi Z. Li

doi:10.3139/120.110450

Article

Experimental and theoretical investigations on diffusion process for rare earth ores

Ye He and Wenzhi Z. Li

Published/Copyright: August 22, 2013

Published by

Become an author with De Gruyter Brill

Submit Manuscript Author Information

From the journal Materials Testing Volume 55 Issue 5

Abstract

The diffusion reaction kinetics of weathered crust elution-deposited rare earth with mixed ammonium salts was studied. The influence of concentration of reagents and particle size of ore on diffusion rate was investigated. The results showed that the diffusion process and diffusion rate could be improved by increasing reagents concentration and decreasing diffusion flowing rate and particle size. The diffusion process could be explained with the shrinking core Model, which could be controlled by the diffusion rate of reacting reagents in porous solid layer.

Abstract

Für den vorliegenden Beitrag wurde die Kinetik des Auslaugprozesses von verwitterten durch Elution abgelagerten Krusten-Seltenerden mittels gemischter Ammoniumsalzen untersucht. Der Einfluss der Konzentration der Reagentien und die Partikelgröße des Erzes auf die Auslaugungsrate wurden ermittelt. Die Ergebnisse zeigen, dass der Diffusionsprozess und die Auslaugungsrate mittels einer Erhöhung der Reagentienkonzentration und durch Verringerung der Auslaugflussrate sowie der Partikelgröße verbessert werden kann. Der Auslaugprozess kann mittels des Schrumpfkernmodells erklärt werden, das mit der Diffusionsrate der reagierenden Stoffe in der porösen festen Schicht kontrolliert werden kann. Die Auslaugungsrate gehorcht der Gleichung 1 – 2/3η – (1 – η)^2/3 = 7.126 × 10⁻⁴C^0.3038R^0.1942t.

References

1 R.Chi, J.Tian. Weathered crust elution-deposited rare earth ores. New York: Nova Science Publishers, Inc, 2008.Search in Google Scholar

2 R.Chi, G.Zhu. Rare earth partitioning of granitoid weathering crust in southern China. Transactions of Nonferrous Metal Society of China, 1998, 8 (4): 693–704.Search in Google Scholar

3 R.Chi, J.Tian. Review of weathered crust rare earth ore. Journal of the Chinese rare earth society, 2007, (25):641–650.Search in Google Scholar

4 X.Tang, M.Li. In-situ Leach Mining of Ion-Absorbed Rare Earth Mineral. Mining research and development, 1997, 17 (2): 1–4.Search in Google Scholar

5 D. C.Mo. Metallurgical kinetic study. Central South University of Technology Publisher, Chnagsha, China, 1987Search in Google Scholar

6 Z. H.Fang. Leaching Process. Metallurgical Industry Publishers, Beijing, China, 2007Search in Google Scholar

7 R.Chi, Z.Dai, Y.Wu. Correlation analysis on partition of rare earth in ion-exchangeable phase from weathered crust ores. Transactions of Nonferrous Metal Society of China, 2006, 16: 1421–142810.1016/S1003-6326(07)60031-4Search in Google Scholar

8 H. Q.Yao, K.Ou, G. H.Rao. A Study on Leaching Rare Earth from the Weathered Elution deposited Rare Earth Ore with Compound Leaching Reagent. Jiangxi Science, 2005, 23 (6): 721–726Search in Google Scholar

9 J.Tian, J.Yin. Kinetic and mass transfer study on leaching a south china rare earth ore. Rare Metal, 1996, 22 (5): 330–342Search in Google Scholar

10 J.Tian, S. L.Lu, J. Q.Yin. Kinetic study on diffusion a south china rare earth ore. Engineering Chemistry and Metallurgy, 1995, 16 (3): 354–357Search in Google Scholar

11 H. Y.Sohn, M. E.Wadsworth. Extraction metallurgy rate process. Metallurgical Industry Publishers, Beijing, China, 1983Search in Google Scholar

Published Online: 2013-08-22

Published in Print: 2013-05-02

You are currently not able to access this content.

Articles in the same Issue

https://doi.org/10.3139/120.110450