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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 3    June 2001

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Leaching hydrodynamics of
weathered elution-deposited rare earth ore
TIAN Jun(田  君)1,2, CHI Ru-an(池汝安)1, ZHU Guo-cai(朱国才)1,
XU Sheng-ming(徐盛明)1, QIU Xin(邱  欣)1, ZHANG Zhi-geng(张志庚)

1. Institute of Nuclear Energy Technology,
Tsinghua University, Beijing 102201, P.R.China;
2. Institute of Applied chemistry,
Jiangxi Academy of Sciences, Nanchang 330029, P.R.China

Abstract: Both porosity (φ) and permeability ( k ) of the weathered elutiondeposited rare earth ores are basic hydrodynamic parameters for RE leaching. The relationship between k and φ of two typical rare earth ores of South China in the packed bed was investigated by measuring the flow ( Q ) under various leaching pressure difference (Δp ). The experimental results show that the relationship between k and φ is unique, moreover the relationship between Q andΔp is in accord with the Darcy's law. The effects of the type of ores, the leaching reagents and its concentration, the granule ore size on the leaching permeability have also been investigated. It is demonstrated that kH (for heavy RE ore, kH=35.98?mm2)>kM-H(for middle-heavy RE ore,kM-H=28.50 mm2), whereas k(NH4NO3)>k(NH4Cl)>k[(NH4)2SO4], and the k value increases with increasing leaching reagents concentration and granule ore size(k0.60~0.75 mm=99.96 mm2k0.125~0.60 mm=11.83 mm2, k0.074~0.125 mm=0.84 mm2).

 

Key words:  hydrodynamics; rare earth ore; leach; porosity; permeability

ISSN 1672-7029
CN 43-1423/U

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