Optimization of process of the cadmium zone refining in hydrogen flow

The values of technological parameters of zone refining, minimizing the process duration under preset restrictions for pure cadmium extraction percentage and degree of its refining, are determined. Under conditions of cadmium zone refining the most suitable way to search for optimal process parameters is to follow the successive stages: synthesis of necessary adequate statistical models, statement of the corresponding optimization problem on their basis and taking into account concrete technological restrictions, numerical problem solution on computer. The refined cadmium extraction percentage and impurity content in the final ingot part, determined according to total content of copper, lead, indium and gallium impurities, are considered. The obtained optimal conditions for cadmium zone refining in a hydrogen flow differs from the previously used one by less process time, that has enabled to reduce labour intensity of the process and power consumption