电解制备焦磷酸锰（Ⅲ）盐工艺条件及动力学研究

doi:10.11962/1006-4990.2018-0603

Abstract

Abstract:

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

CLC Number:

TQ137.12

Liu Sihao,Chen Jinfang,Wang Yan. Study on technological condition and kinetic of preparing manganese(Ⅲ) pyrophosphate by electrolysis[J]. Inorganic Chemicals Industry, 2019, 51(9): 24-29.

Figures/Tables 8

References 23

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温度/℃	三价锰浓度/ （mol·L^-1）	温度/℃	三价锰浓度/ （mol·L^-1）
0	0.033 84	30	0.004 512
10	0.018 05	40	0.001 128
20	0.010 15

扫速/（mV·s^-1）	峰	E_p/V	I_p/A	ΔE_p/V	I_λ/A	I_pa/I_pc	к⁰	ψ
5	氧化	0.738	3.99×10^-2	0.151	5.39×10^-2	2.76	7.42×10^-5	0.032 82
5	还原	0.587	-2.40×10^-2	0.151	5.39×10^-2	2.76	7.42×10^-5	0.032 82
10	氧化	0.790	5.85×10^-2	0.240	6.34×10^-2	2.14	1.29×10^-4	0.040 26
10	还原	0.550	-3.10×10^-2	0.240	6.34×10^-2	2.14	1.29×10^-4	0.040 26
15	氧化	0.814	6.30×10^-2	0.341	6.34×10^-2	1.89	2.73×10^-4	0.069 67
15	还原	0.473	-3.76×10^-2	0.341	6.34×10^-2	1.89	2.73×10^-4	0.069 67
20	氧化	0.846	1.06×10^-1	0.389	1.16×10^-1	1.91	1.79×10^-4	0.039 61
20	还原	0.457	-6.99×10^-2	0.389	1.16×10^-1	1.91	1.79×10^-4	0.039 61
25	氧化	0.868	1.09×10^-1	0.425	1.16×10^-1	1.67	3.67×10^-4	0.072 61
25	还原	0.443	-7.01×10^-2	0.425	1.16×10^-1	1.67	3.67×10^-4	0.072 61

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on technological condition and kinetic of preparing manganese(Ⅲ) pyrophosphate by electrolysis

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