Online soft measurement method for current efficiency of aluminum electrolysis cell

• Main Authors: LIU DEFU, WANG CHUNJIANG, YANG YONGCHONG, WANG JING, GUO JIXING, LI XIAOBO, YI SHAOHUI
• Format: Patent
• Language: Chinese; English
• Published: 25.06.2021
• Subjects: APPARATUS THEREFOR; CHEMISTRY; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; METALLURGY; PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY ORREFINING OF METALS

The invention discloses an online soft measurement method for current efficiency of an aluminum electrolysis cell. The method comprises the following steps: a, constructing a correction formula: gamma (%) = 0.5 * (psi (CO2)-psi 0 (CO2))/(psi (CO2)-psi 0 (CO2) + psi (CO)) + 50% + K (psi 0); wherein gamma (%) is current efficiency, psi (CO) is carbon monoxide concentration, psi (CO2) is carbon dioxide concentration, psi 0 (CO2) is atmospheric CO2 concentration constant, and K (psi 0) is a correction coefficient; b, correspondingly substituting the acquired online concentration data of CO and CO2 of the electrolytic cell into psi (CO) and psi (CO2) of the correction formula, and carrying out current efficiency online soft measurement function model coefficient iterative regression to obtain the correction coefficient K (psi 0); and c, collecting online concentration data of CO and CO2 of the electrolytic cell again, and correspondingly substituting the online concentration data into the psi (CO) and the psi (CO2