Application of PLC-Based Spectrophotometric System Nitrogen Protection Device to Automated Direct Measurement of Target Substances in Zinc Hydrometallurgy

Due to the fast material reaction in zinc hydrometallurgy, traditional national standard photometric method cannot capture characteristic information of target substances real time. Herein, a nitrogen protection device is built based on ultraviolet spectrophotometry, supplemented by programmable logic controller (PLC), form an automatic control system for direct detection (SO42−, Pb2+ and S2−) hydrometallurgy. The baseline straightness comparison results show that atmosphere can effectively improve stability instrument. Furthermore, sensitivity SO42−, S2− under higher than air atmosphere, manifesting increases 16.23%, 18.05% 17.91%, respectively. Additionally, devices PLC systems advantages over manual both states feedback backtrack. Moreover, regulation time consumption during process are reduced 80% 75%, respectively, which reduces test cost improves equipment utilization rate (from four cycles per day six day). meet requirements different conditions changing electronic parts source, so it has great application potential measurement