Inorganic Chemicals Industry >
Study on technological condition and kinetic of preparing manganese(Ⅲ) pyrophosphate by electrolysis
Received date: 2019-03-21
Online published: 2020-06-10
Two-compartment cell was firstly used to electrolyze soluble trivalent manganese in the pyrophosphatic acid.The factors of current density,concentration of pyrophosphatic acid and electrolytic temperature etc.to the concentration of soluble trivalent manganese and current efficiency were investigated respectively.The process parameters were optimized by single factor conditional experiment.The influencing factors of the process were explained and analyzed.The kinetic parameters of manganese(Ⅲ)/manganese(Ⅱ) on the graphite electrode under the pyrophosphatic acid medium were also calculated.The optimal technological conditions were as follows: the electrolytic time was about 5 h,the current density was 10.87 mA/cm2,the electrolytic temperature was 0 ℃,the electrolyte was 0.3 mol/L MnH4P2O8+3 mol/L pyrophosphatic acid.Under the optimal conditions,the concentration of electrolyze soluble trivalent manganese and the current efficiency were the best.The kinetic calculation was carried out by electrochemical test parameters.manganese(Ⅲ)/manganese(Ⅱ) was quasi-reversible in 0.3 mol/L MnH4P2O8+3 mol/L pyrophosphatic acid electrolyte.The conditional electrode potential of the process was 1.315 V vs.NHE,the diffusion coefficient of divalent manganese ions in the system was 8.347×10-6 cm2/s.
Key words： soluble manganese(Ⅲ); pyrophosphatic acid; electrolysis; kinetics
Sihao Liu , Jinfang Chen , Yan Wang . Study on technological condition and kinetic of preparing manganese(Ⅲ) pyrophosphate by electrolysis[J]. Inorganic Chemicals Industry, 2019 , 51(9) : 24 -29 . DOI: 10.11962/1006-4990.2018-0603
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