Vo187 No6 PP17431474 ACTA GEOLOGICA SINICA(English Edition) Dec2013 Roof of the rid HAO Ziguo 一，FEI Hongcai 一，LIU Lian ， and Susan TURNER2 1 Chinese Academy ofGeological Sciences，Beijing lO003Z China 2 Editorial office ofActa Geologica Sinica(English edition)，Geological Society ofChina,Beijing lO003 Z China First Joint meeting of the Geological Society of China(GSC) together by the GSA International Section Chengdu，China in 1 7一 be downloaded for free and the Geological Society of America(GSA)Brought 1 9 June 20 1 3The abstracts are available online and can ln 2013the First Joint meeting of GSC and GSA were successfully held in Chengdu，China on 1719 June。with about 500 participants in these meetingsA total of 53 1 abstracts were received，and 1 5 topics：1 1 including the geotectonic evolution of QinghaiTibetan Plateau， 2)Continental deformation and deep lithosphere processes， 3)Origin of ophiolites，podiforffl chromites，UHP minerals and tectonics，4)Foreland basin tectonics and sedimentation(north of the Tibetan Plateau)，5)Deep Earth processes through geochemistry， 6)Accretionary orogens and growth of the continental crust， 7)Intracontinental deformationActive faults，earthquakes and Geohazard(eg Wenchuan)， 8)UHP metamorphism，oceaniccontinental subduction and collision，9)Sedimentary basins and oilgas resources， 1 0)Water resources，hydrogeology，11)Mineral deposits in continents：Genesis and exploration，12)Critical订ansitions in the history of life and Earth， 1 3)Mass extinction at the PermoTriassic boundary and subsequent recovery dynamics， 1 41 Carbon cycle and CO2 sequestration，1 5、Gas hydrates These abstracts basically contain the latest academic achievements in many geologica1 fields and are worth reading Abstracts from GSCGSA(14cta Geologica Sinica-English Edition，No87，Supp1 Breakthr0ugh in the Chinas Extraction of Rare Separation Technology for Earth Elements HAO Ziguo _，FEI Hongcai ，LIU Lian and Susan TURNER2 1 ChineseAcademy ofGeological Sciences，Beijing lO003Z China 2 Editorial office ofActa Geologica Sinica(English edition),Geological Society ofChina,Beijing lO003Z China Separation technology of rare earth elements(REEs)，as the critical step in the separation process，had long been fraught with technical dif矗cultyA research project conducted by Baotou Shibo Rare Earth Extraction&Equipment CoLtd Baotou REE Research Institute，and Baotou Steel&REE Group Hi11ech CoLtd(Inner Mongolia)，has successfu1lV solved the problem using a centrifuga1 ex仃actor and advanced techniques to achieve a key breakthrough The key device of the whole production line contains CTL。500FB centrifuga1 extractors and digita1 flow system equipmentEmployment of an automatic controlling system and its fully functiona1 operation systemalong with various supportive facilities，fulfils the separation processes for various rare earth materialsCompared with conventional boxtype separation technology,this new approach significantly improves the stirring intensity,thus improving production effectiveness and process capacityUnder the condition of the same production outputthe amounts of ex仃actant and feedstock used are greatly reduced as is the lOSS of aqueous solution in the extractantA short balance time(a single1evel balance takes only 30 seconds)reduces the influence of startup and shutdown over productionFull closure of the production system removes the loss of volatiles in the diluentsin turn reducing consumption and significantly improving the production environmentReduced operation steps 1cad to lower operation costs The production line relies heavily on a centrifuga1 extraction production 1inewhich can process 5000 tons of carbonate tvpe REE feedstock per year,and a I EE recovery production line，which can process 3000 tons of Nd_Fe_Bbearing 2013Geological Society ofChina