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EXPERIMENTAL STUDIES ON METALLOGENETIC MECHANISM OF WEATHERING CRUSTLEACHING REE DEPOSITS IN SOUTHERN CHINA

Lin Chuanxian;Zheng Zuoping (Guangzhou Branch,Institute of Geochemistry,Academia Sinica,Cuangzhou 510640)  
Weathering crust-leaching REE deposits in southern China are experimentally studied. The clays that are used for adsorption experiments of Nd and Yb are extracted from the weathering crust-leaching REE ore deposits in the Wuzhou area using the standard sedimentation method. The results show that the equilibrium time of Yb adsorption varies with electrolytic system.It needs 12 hours for the 2% HCI system, and 0.2 hours for the 1% HCI system.The physicochemical factors that affect REE adsorption by clays include electrolytic concentration of the solution,pH value, ionic strength,temperature,and the solid/liquid ratio.The adsorption of Nd is more effective than that of Yb at low PH conditions.The amount of Yb adsorption by clays considerably increases with increasing PH value.The Langmuir isotherm model and Geng’s isotherm equation are discussed based on experimental observations,and a model of acidic infiltration coupled with the adsorption of REE by clays is proposed to explain the metallogenetic mechanism of the weathering crustleaching REE ore deposits.
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