Optimal control based on control period calculation for copper removal process of zinc solution purification
ZHANG Feng-xue
YANG Chun-hua
ZHOU Xiao-jun
GUI Wei-hua
Abstract：The copper removal process is the first step in zinc solution purification of direct leaching of zinc hydromet-allurgy, and its result has a significant impact on the follow-up process and the quality of the final product. In the copper removal process, the undetermined control period and addition amount of zinc-powder always lead to the fluctuation of outlet copper concentration and the waste of zinc powder. In order to solve this problem, an optimal control strategy based on control period calculation for copper removal process is proposed. First, the sequential relationship between oxidation-reduction-potential (ORP) and zinc powder is analyzed to calculate the response time of copper removal process, and then the control period is obtained by analyzing the statistical characteristic of response time. Next, the optimal control problem is transformed into a nonlinear mathematical programming problem by the fixed-node control parameterization method. Furthermore, the state transition algorithm is applied to solve the nonlinear mathematical programming problem. And the simulation results demonstrate the effectiveness of the proposed control strategy.
Keywords：copper removal processoptimal controlcontrol periodcontrol parameterizationstate transition algorithm
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 1388-1395 )