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Column leaching process of rare earth and aluminum from weathered crust elution-deposited rare earth ore with ammonium salts 被引量:17
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作者 何正艳 张臻悦 +4 位作者 余军霞 徐志高 徐源来 周芳 池汝安 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第11期3024-3033,共10页
In order to better understand the leaching process of rare earth (RE) and aluminum (Al) from the weathered crust elutiondepositedRE ore, the mass transfer of RE and Al in column leaching was investigated using the... In order to better understand the leaching process of rare earth (RE) and aluminum (Al) from the weathered crust elutiondepositedRE ore, the mass transfer of RE and Al in column leaching was investigated using the chromatographic plate theory. Theresults show that a higher initial ammonium concentration in a certain range can enhance the mass transfer process. pH of leachingagent in the range of 2 to 8 almost has no effect on the mass transfer efficiency of RE, but plays a positive role in the mass transferefficiency of Al under strong acidic condition (pH〈4). There is an optimum flow rate that makes the highest mass transfer efficiency.The optimum leaching condition of RE is the leaching agent pH of 4?8, ammonium concentration of 0.4 mol/L and flow rate of0.5 mL/min. The mass transfer efficiencies of RE and Al both follow the order: (NH4)2SO4〈NH4Cl〈NH4NO3, implying thecomplexing ability of anion. 展开更多
关键词 column leaching process weathered crust elution-deposited rare earth ore rare earth ALUMINUM ammonium salt masstransfer
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A Novel Surface Aeration Configuration for Improving Gas-Liquid Mass Transfer 被引量:5
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作者 禹耕之 毛在砂 王蓉 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2002年第1期39-44,共6页
A novel surface aeration configuration featured with aself-rotating and floating baffle (SRFB) and a Rushton disk turbine(DT) with a perforated disk has been developed. The SRFB, consistedof 12 fan blades twisted By a... A novel surface aeration configuration featured with aself-rotating and floating baffle (SRFB) and a Rushton disk turbine(DT) with a perforated disk has been developed. The SRFB, consistedof 12 fan blades twisted By an angle of 30 deg to the horizontalplane, is incorporated onto the impeller shaft to improve gasentrainment, bubble Breakup, mixing in a φ 154 mm agitated vessel.This new configuration is compared to the conventional DT surfaceAeration experimentally. The results suggest that the criticalimpeller speed for onset of gas entrainment is lower for The newconfiguration and it demands greater power consumption. Moreover, theSRFB system produces 30/100-168/100 Higher volumetric mass transfercoefficient per unit power input than that obtained in theconventional DT surface Aerator under the same operation conditions. 展开更多
关键词 surface aeration self-rotating and floating baffle gas-liquid masstransfer
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