The Effect Of Electric Field Environmental Electric Field Distribution On Electrolytic Extraction Of Zinc

The electric field distribution in aqueous electrolyte tank not only affects ion transfer,diffusion,concentration polarization,but also affects current efficiency,energy consumption per unit,uniformity of cathode products and lifetime of plate.At the same time,current efficiency and energy consumption per unit are important indexes to evaluate the technical level and economic benefit of an electrolytic enterprise.Therefore,the establishment of an electric field model that can improve the technological level and economic benefits of electrolytic enterprises has become the key point of this project.Firstly,the influence of the conventional Pb alloy anode and Pb-Al layer composite anode plate on the electric field distribution in the zinc electrolysis tank was simulated and analyzed by using ANSYS simulation software.The influence of the thickness of Al core in Pb-Al composite anode plate on the electric field distribution in zinc electrolysis tank is studied.Then,the influence of loading current density and electrolyte composition on the electric field distribution in the zinc electrolytic bath is studied on the basis of the Pb-Al layered composite anode plate with the best performance.Finally,according to the distribution law of the electric field in the zinc bath,the distribution law of electric field in the nickel bath is analyzed.The conclusions are as follows:(1)The electric field distribution law of the aqueous solution electrolysis tank is similar.Among them,the potential cloud diagram of the electrolytic cell is:the equipotential zone of the anode plate and its vicinity,the equipotential zone of the cathode plate and its vicinity,the electrolyte potential gradient density zone between the plates,and other electrolyte equipotential zone.The current density distribution of the electrolytic cell:conducting beam,electrolysis system and other electrolyte.The potential cloud diagram of the anode plate is:the electric potential gradient starts from the conducting beam,and the electric potential gradient near the receiving end is large,the electric potential gradient far away from the receiving end is small.The current density distribution of the anode plate is:there is almost no current passing through the non conducting side of the conducting beam.The current density of Pb-Al composite anode plate surface is about 1/10 of the current density of Al core.Electrolyte potential cloud:the distribution of electric potential gradient between the plates is uniform,the distribution of electric potential gradient near the edge of the anode plate is not uniform,and the edge of the cathode plate can be regarded as an equipotential body.The distribution of current density electrolyte:The current direction of between plates is perpendicular to the cathode plate and points to the cathode plate,the current direction of anode plate edge divergent from the anode plate to the electrolyte,other electrolyte-a weak current produced by the influence of cathode plate and anode plate.The potential cloud diagram of the cathode plate is:the electric potential gradient near the exiting end is large,the electric potential gradient far away from the exiting end is small.(2)The thickness of A1 core has no effect on the current density of the Pb-Al layered composite anode plate in the zinc electrolysis cell.The distribution and size of the current in the electrolytic cell will not be changed either in the layered anode plate or in the homogeneous anode plate.When the thickness of Al core is 1.6mm,the voltage of anode plate is the smallest,and the current density is the smallest.At this time the current efficiency is best,the minimum energy consumption.The equivalent circuit of the electrolytic cell is connected in series and parallel,but not in series.(3)The voltage of the electrolyzer(V)increases with the increase of the supply current density(A/m2).The relationship of electrolyzer voltage U and current density J:U=0.000577498J-7.65×10-6.The relationship of anode voltage U and current density J:U=0.00001392J-1.6×10-6.The relationship of electrolyte voltage U and supply current density J:U=0.000570033J-7.75×10-6.The relationship of cathode voltage U and supply current density J:U=0.000005975)-1.5×10-6.The supply current density does not change the potential cloud and the current density of anode plate,electrolyte and cathode plate.(4)The voltage of electrolytic cell and the resistivity of electrolyte are consistent with the changing rule of electrolyte composition:When the concentration of Zn2+ is constant,the voltage decreases with the increase of H2SO4 concentration.When the concentration of H2SO4 is constant,the voltage decreases with the increase of Zn2+ concentration.The effect of H2SO4 concentration on the resistivity or voltage of electrolyte is more significant.The change regulation of the maximum potential and minimum potential of the anode plate,the maximum potential and voltage of the electrolyte,the size of the current density of the anode plate,and the size of the electrolyte current density are identical.The voltage of the anode plate,the minimum potential of the electrolyte,the voltage and the current density of the cathode plate are independent of H2SO4 concentration and Zn2+ concentration.The electrolyte composition does not change the potential nephogram and the current density nephogram of the electrolytic cell,the anode plate,the electrolyte and the cathode plate.