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HWAHAK KONGHAK,
Vol.30, No.1, 46-54, 1992
Vol.30, No.1, 46-54, 1992
Di--n-Butylphosphoric Acid에 의한 우라늄(VI)의 추출속도에 관한 연구
A Study on Extraction Kinetics for Uranium(VI) with Di-n-Butylphosphoric Acid
Kerosene내 HDBP(di-n-butylphosphoric acid)를 이용한 질산용액으로부터의 우라늄(VI)의 추출속도에 대하여 연구하였다. 일정한 계면적을 가지는 Lewis cell을 이용하여 초기 추출속도 및 역추출속도실험을 25℃ 이온강도 0.5M의 NaNO3 및 HNO3 혼합 용액하에서, 120rpm에서 수용상의 우라늄(VI)농도 0.1-0.5×10-3mol/dm3, 질산의 농도는 0.1-0.5mol/dm3, 유기상에서의 monomeric HDBP의 농도는 0.04-0.08mol/dm3의 범위에서 실험을 수행하였다. 추출속도는 유기상의 HDBP의 농도에 1/2승에, 수용상의 우라늄(VI)논도에 비례하면, 수용상의 수소이온농도의 0.281승에 반비례하였다. 역추출속도는 유기상에서의 우라늄(VI)의 농도에 비례하고 수용상의 수소이온농도의 2승에 비례하면 HDBP dimer농도의 1/2승에 반비례하였다. 또한 추출반응기구 및 겉보기 속도상수를 실험결과로부터 제시하였다.
The kinetics for the extraction of uranium(VI) from aqueous nitric acid solutions by di-n-butyl-phosphoric acid(HDBP) in kerosene as the diluent was investigated. Lewis cell with constant interfacial area was utilized to measure initial rates of the extraction and the stripping with aqueous phases containing 0.1-0.5mol/dm3 of nitric acid, 0.1-0.5mol/dm3 of uranium(VI) and kerosene-diluted organic phases containing 0.04-0.08mol/dm3 of monomeric HDBP at 25℃ under the agitation speed of 120rpm. The extraction rate is one-half order with respect to the concentration of HDBP dimer in the organic phase, the first order with respect to the concentration of uranium(VI) in the aqueous phase and inversely proportional to the 0.281 power of the concentration of the aqueous-phase nitric acid. The stripping rate is the first order and inverse one-half order with respect to the concentration of uranium(VI) and HDBP dimer in the organic phase, respectively, and the second order with respect to the concentration of nitric acid in the aqueous phase. a kinetic scheme was proposed and the apparent rate constant were also evaluated.
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