金属水溶液电解电极电流在线测量方法

在金属的水溶液电解提取过程中,电极短路会降低电解电流效率,增大电耗,降低阴极产品的质量。电极电流的变化是监测电极短路的最有效方法。由于电解环境恶劣、电磁场分布复杂,电极数目众多,目前缺少有效的电极电流在线测量方法。本文提出一种测量电极电流的方法,其采用线性霍尔传感器实时检测电极下的磁感应强度,利用霍尔电势、磁感应强度和电流之间的解耦数学模型计算出流过导电棒电流。在实验室使用导电棒代替电极搭建电解槽进行测试,结果表明,当流过导电棒的总电流在10～100 A之间按照线性变化时,本文提出的方法测得的单个导电棒的电流与钳形表测量值的偏差在1 A以内,测量误差在2%以内。本电流测量系统精度高,可以用于铜、锌等金属水溶液电解槽的电极电流在线测量。

An on-line measurement method for electrode current of metal aqueous solution electrolysis

During the process of electrolytie extraction of metal from aqueous solutions, short-eireuiting eleetrodes could reduceeletrolysis current efficieney, inerease power consumption,and reduce the quality of cathode produets. The change of electrodecurent is the most effective way to monitor electrode short circuit. Due to the harsh electrolysis environment, the complexelectromagnetie field distribution, and the large number of electrodes, there are curmently lack of effeetive online eleetrode currentmeasurement methods. This paper proposes a method of measuring electrode current, which uses a linear Hall sensor to detect themagnetice induetion under the electrode in real time. The decoupling mathematical model among the Hall potential, magnetic induetionand current is utilized to caleulate the current flowing through the conduetive rod. In the laboratory, conductive rods are used insteadof electrodes to build an electrolytie cell for testing. Results show that when the total current flowing through the conduetive rods varieslinearly between 10 and 100 A, the current of a single conduetive rod measured by the proposed method is comparable to the clamp.The deviation of the measured value of the shape meter is within 1 A. And the measurement eror is within 2%.The currentmeasurement system has high accuracy and ean be used for on-line measurement of electrode currents in electrolyzers of metal aqueoussolutions such as copper and zine.