Multi-field Coupled Numerical Simulation And Optimization For Electrolytic Metal Manganese Energy Saving Electrolytic Cell

In electrolytic process of manganese,electrolytic energy consumption remains high due to the competitive reaction on the electrode,the generation of anode mud,cathode fractal growth and anodic electrochemical oscillation and other factors.The electric field,concentration field,temperature field and other multi-field and chemical field in the cell directly affect these factors.In recent years,many studies have shown that the structure of electrolytic cell and current loading method can effectively control and optimize the distribution of physical field and chemical field in electrolytic cell.Therefore,it is very important to optimize the multi-field in the electrolytic cell by optimizing the geometrical structure of the electrolytic cell and the current loading method and so on.It is of great significance to realize the energy saving and consumption reduction in the process of electrolytic manganese production.In this work,the geometrical structure of the electrolytic cell,the geometry of the anode and the current loading method are taken as breakthrough.Combining with the experimental and numerical simulation,the influence of the above parameters on the current efficiency,unit power and the physical field in the electrolytic cell were investigated.(1)Combining electrodeposition experiment and numerical simulation,the effect of structure parameters of the manganese electrolytic cell(anode–cathode distance,anode–cathode relative position,relative size of anode and cathode)on the process current efficiency,unit power consumption,electrolytic cell field and concentration field,which provide guidance and reference for the actual production and process optimization.The anode–cathode distance less than 4cm,the relative angle of the plate placed in 0 ~ 2deg,the anode size is smaller than the cathode were conducive to saving energy in the process of electrolytic manganese,when the plate spacing is small,should promptly add the electrolyte concentration.(2)The effect of anode with different opening shapes on the economic index of electrolytic manganese and the electric field distribution in electrolytic cell were investigated by DC electrodeposition and numerical simulation.The results show that,the anode plate with circle openings obtain maximum current efficiency 74.54% and per-unit energy consumption reduced to 5506 kW·h/t,and the surface of metal manganese is more smooth and compact.In the electrolysis process,When the anode plate with circle openings,the electric field distribution in the electrolytic cell is uniform and reasonable,and the minimum value of V-1.5989 is obtained in the horizontal and vertical direction of the cathode plate.The anode current flow to the other direction of the flow reduction,and the electrolyte internal resistance voltage drop is low,the current loss is reduced.(3)The correctness of the mathematical model of the electro-concentration field is verified by the on-line measurement of the cathodic over-potential.In the process of preparation of metal manganese by DC electrodeposition,the cathodic overpotential potential changes with time as the current is almost constant,and the cathodic overpotential is about-1.611 V.The error between the simulated value and the experimental value is less than 5%.The model can effectively predict the distribution of electric field and concentration field in the electrolysis cell.(4)The effects of double pulse parameters(forward average current density JF,reverse pulse coefficient ?,a set of forward pulse working time TF and reverse pulse working time coefficient ?)on the current efficiency were investigated by bipolar pulse electrodeposition.The results show that the optimum pulse current is JF=350A/m~2,the reverse pulse coefficient ?=1/10,and the set of forward pulse working time TF =150ms,reverse pulse working time coefficient ?=1/15,and the current efficiency achieved 80.25% and anode mud yield reduced to 2.93 g from the electrolysis experiment of 2h.The results show that the distribution of multi-physical fields in the electrolysis cell can be effectively controlled by the geometry of the electrolytic cell,the geometry of the anode geometry and the way of current loading,so as to provide the theoretical basis for the actual production and equipment innovation.