Strength characteristics of weathered crust elution-deposited rare earthores with different porosity ratios

YIN Sheng-hua; QI Yan; XIE Fang-fang; CHEN Xun; WANG Lei-ming

doi:10.13374/j.issn2095-9389.2018.02.005

Volume 40 Issue 2

Feb. 2018

Turn off MathJax

Article Contents

Article Navigation > Chinese Journal of Engineering > 2018 > 40(2): 159-166

YIN Sheng-hua, QI Yan, XIE Fang-fang, CHEN Xun, WANG Lei-ming. Strength characteristics of weathered crust elution-deposited rare earthores with different porosity ratios[J]. Chinese Journal of Engineering, 2018, 40(2): 159-166. doi: 10.13374/j.issn2095-9389.2018.02.005

Citation:

YIN Sheng-hua, QI Yan, XIE Fang-fang, CHEN Xun, WANG Lei-ming. Strength characteristics of weathered crust elution-deposited rare earthores with different porosity ratios[J]. Chinese Journal of Engineering, 2018, 40(2): 159-166. doi: 10.13374/j.issn2095-9389.2018.02.005

Citation:

YIN Sheng-hua, QI Yan, XIE Fang-fang, CHEN Xun, WANG Lei-ming. Strength characteristics of weathered crust elution-deposited rare earthores with different porosity ratios[J]. Chinese Journal of Engineering, 2018, 40(2): 159-166. doi: 10.13374/j.issn2095-9389.2018.02.005

PDF( 2678 KB)

Strength characteristics of weathered crust elution-deposited rare earthores with different porosity ratios

doi: 10.13374/j.issn2095-9389.2018.02.005

1) Key Laboratory of Ministry of Education for High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China
2) School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
3) Jiangxi Ionic Rare Earth Engineering Research Co., Ltd., Ganzhou 341000, China
4) National Engineering Research Center for Ionic Rare Earth, Ganzhou 341000, China

Received Date: 2017-04-27

Abstract

Abstract

The porosity ration of weathered crust elution-deposited rare earth ores is the main factor that affects the leaching results and the stability of the ore body. To determine the strength characteristics of weathered crust elution-deposited rare earth ores under different porosity ratios, six groups of rare earth minerals were reconstituted, and direct shear tests were performed for different samples. The effect of pore evolution on the shear strength of the orebody was studied, and the mechanism of the influence of porosity ratio on cohesion and internal friction angle was revealed. The results show that the unsaturated rare earth ores with different porosity ratios correspond to different shear strengths. The relation between shear stress and shear displacement was summarized as parabolic type based on the experimental data, and the relation between the porosity ratio and the shear strength index was established. The mechanism analysis shows that with an increase in the porosity ratio, the effect of the bonded water film effect gradually weakens, the number of the contact points reduces, and the shear strength of the minerals reduces.
- weathered crust elution-deposited rare earth,
- porosity ratio,
- influence mechanism,
- shear strength index

FullText(HTML)

References(5)

References

[3]	Chi R A, Tian J, Li Z J, et al. Existing state and partitioning of rare earth on weathered ores. J Rare Earths, 2005, 23(6): 756
[4]	Moldoveanu G A, Papangelakis V G. Recovery of rare earth elements adsorbed on clay minerals: I. Desorption mechanism. Hydrometall, 2012, 117-118: 71
[7]	Moldoveanu G A, Papangelakis V G. An overview of rare-earth recovery by ion-exchange leaching from ion-adsorption clays of various origins. Mineralogical Mag, 2016, 80(1): 63
[18]	Mishra A K, Ohtsubo M, Li L Y, et al. Influence of various factors on the difference in the liquid limit values determined by Casagrande's and fall cone method. Environ Earth Sci, 2012, 65(1): 21
[19]	Lin B T, Cerato A B. Shear strength of shale weathered expansive soils along swell-shrink paths: analysis based on microscopic properties. Environ Earth Sci, 2015, 74(9): 6887