Effect Of Magnetic Field On Structure Of Low Concentration Copper Ion Solution And Enhancement Mechanism Of Enhanced Electrodeposition

In the process of hydrometallurgical recovery of cathode materials for lithium batteries,due to the low concentration of copper ion pollution in the leaching solution of multi metals,the common problems of complex valuable metal recovery process and secondary waste residue pollution are often caused.The low efficiency of electrodeposition is caused by the limited reaction and transfer in the process of low concentration copper ion electrodeposition.In order to solve this problem,a new method of cyclic magnetic field enhanced electrodeposition was proposed,and the effects of magnetic field on the structure of low concentration copper ion solution and the enhancement mechanism of enhanced electrodeposition were studied.（1）A method of low concentration copper ion electrodeposition enhanced by magnetic field pre magnetization was proposed,and a theoretical research platform of magnetic field controlled solution structure was constructed.UV-vis,FT-IR,Raman and viscosity were used to detect the microstructure.It is confirmed that the magnetic field can regulate the structure and morphology of water clusters and hydrated particles,and improve the ion transfer rate and electrodeposition efficiency of the diffusion layer.（2）The 0.5 T static magnetic field was applied to the low concentration copper ion solution.The results show that the pre magnetized electrolyte can change the hydrogen bond structure,increase the solution viscosity,reduce the radius of hydrated particles,reduce the structural symmetry of hydrated ions,reduce the reaction activation energy,and improve the transfer coefficient of copper ions in the diffusion layer.After pre magnetization,the electrolysis efficiency of 0.01 mol·L^-1 CuSO₄ solution is increased by 10%,and that of 0.1mol·L^-1 CuSO₄ solution is increased by 5%.The electrolysis efficiency of 0.01 mol·L^-1 CuSO₄solution is increased by 10%when the magnetic field is applied during the electrodeposition process,and the electrolysis efficiency of 0.1 mol·L^-1 CuSO₄ solution remains unchanged.（3）The cyclic magnetic field can improve the ion transfer rate and electrodeposition efficiency of the diffusion layer by regulating the structure and morphology of water clusters and hydrated particles.The results show that the magnetic field strength increases from 0 T to3 T in 3 h pre magnetization time,the ability to destroy DDAA hydrogen bond structure increases,the viscosity ratio of 0.01 mol·L^-1 CuSO₄ solution to water（η/η₀）decreases from1.0197 to 0.9614,and the electrodeposition efficiency increases by 12.9%.Under 3 T high magnetic field,the viscosity ratio of 0.01 mol·L^-1 CuSO₄ solution to water（η/η₀）decreased from 1.0197 to 0.9486,and the electrodeposition efficiency increased by 17.6%.