Abstract: In the electrolytic production of manganese,the presence of SeO2 as an additive leads to selenium deposition in the manganese product,reducing the purity of metallic manganese. Partial selenium precipitation can clog the diaphragm cloth. Selenium residues in the electrolyte,anode mud,and manganese slag,requiring high treatment technology. The use of expensive SeO2 has pushed up the production cost of electrolytic manganese. In order to find an energy-saving,environmentally friendly, and high-purity electrolytic manganese additive that can replace SeO2 ,the electrochemical deposition and electrochemical behavior of manganese in the MnSO4 -(NH4 )2 SO4 -H2O system were investigated using cyclic voltammetry,linear voltammetry, electrochemical impedance spectroscopy,and other electrochemical methods with dihydrocholine citrate as the additive. XRD was used to characterize the electrodeposited manganese product. The results showed that the initial potentials for hydrogen evolution and manganese deposition on the surface of stainless steel cathode are -0. 65 V、-1. 25 V,respectively. Dihydrogen citrate has a significant inhibitory effect on hydrogen evolution reaction. When the concentration of dihydrocholine citrate is 0. 03 g / L,the activation energy of hydrogen evolution reaction is 40. 975 kJ/ mol. At a temperature of 313 K,Mn 2+ concentration of 30 g / L,(NH4 )2 SO4 concentration of 100 g / L,pH= 7. 0,electrolysis current of 2. 0 A,and dihydrocholine citrate concentration of 0. 09 g / L,the maximum current efficiency is 68. 78%,and the electrodeposited manganese is α-Mn. 

Key words: dihydrocholine citrate,manganese,electroc-deposition,hydrogen evolution,cyclic voltammetry