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유동층 전극 반응기에 의한 희박용액으로부터 은(Ag) 회수(II)-반응기 이력 및 전류효율-
Application of Fluidized-Bed-Electrode Reactor to the Recovery of Silver in Dilute Solutions-Part 2. Reactor Performance and Current Efficiency-
HWAHAK KONGHAK, February 1986, 24(1), 81-88(8), NONE
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Abstract
은（Ag） 입자와 시안화은 수용액으로 구성된 회분식 순환 유동층 음극 반응기에서 은을 전착하면서, 층 다공률 및 전류밀도별로 총괄 반응속도상수를 실험적으로 구하여 반응기 이력 및 전류 효율 등을 검토하였다.
총괄 반응속도상수는 은이온 농도 감소에 따라 약간 증가하는 경향이었고, 이 총괄 반응속도상수 대신 물질전달계수를 사용한 이론 모델은 실측치와 상당히 벗어남을 알았다.
전류효율은 전류밀도와 층 다공률 증가에 따라 증가하였으나 층 다공률（0.548-0.651）에 대해서는 최대점이 나타났고 그 이후 감소함을 알았다. 그리고 전류효율은 은이온 농도가 감소함에 따라 약간 감소하였다.
총괄 반응속도상수는 은이온 농도 감소에 따라 약간 증가하는 경향이었고, 이 총괄 반응속도상수 대신 물질전달계수를 사용한 이론 모델은 실측치와 상당히 벗어남을 알았다.
전류효율은 전류밀도와 층 다공률 증가에 따라 증가하였으나 층 다공률（0.548-0.651）에 대해서는 최대점이 나타났고 그 이후 감소함을 알았다. 그리고 전류효율은 은이온 농도가 감소함에 따라 약간 감소하였다.
Overall electrochemical reaction rate constants and current efficiency were experimentally measured to study the performance of a silver-coated-particle cathodic fluidized-bed electrode which deposited silver ion from aqueous silver cyanide solution as the function of bed voidage and current density.
It was found that overall electrochemical reaction rate constants increase slightly as the concentration of silver ion decrease and that the theoretical model using mass transfer coefficient instead of overall electro-chemical reaction rate constant deviate from the experimental values, and that current efficiency increase with current density, but has the maximum value in the range （0.548-0.651） of bed voidage and decrease with the concentration of silver ion.
It was found that overall electrochemical reaction rate constants increase slightly as the concentration of silver ion decrease and that the theoretical model using mass transfer coefficient instead of overall electro-chemical reaction rate constant deviate from the experimental values, and that current efficiency increase with current density, but has the maximum value in the range （0.548-0.651） of bed voidage and decrease with the concentration of silver ion.
