Study on Membrane Electrodeposition Process of Bismuth in Methanesulfonic Acid System AITranslate

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Chinese Library Classification Number:TF817[冶金工程]

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A methanesulfonic acid-bismuth methanesulfonate solution,characterized by its high stability and bismuth salt solubility,was employed as the electrolyte to systematically study bismuth membrane electrodeposition.The effects of current density,electrode distance,electrodeposition temperature,methanesulfonic acid concentration,bismuth concentration,and iron ion concentration on the bismuth electrodeposition process in the methanesulfonic acid system were investigated.The experimental results indicate a wide optimization window for bismuth electrodeposition from an iron-free methanesulfonic acid-bismuth methanesulfonate solution:current density of 150~200 A/m²,electrode distance of 5 cm,electrodeposition temperature of 40℃,methanesulfonic acid concentration of 50~80 g/L,and bismuth concentration of≥50 g/L.Under these optimized conditions,the cathode current efficiency for bismuth electrodeposition exceeds 99%,the DC power consumption per ton of bismuth is below 950 kW·h/t,and the deposited cathode bismuth metal exhibits a compact and smooth surface.In iron-containing(0~30 g/L)methanesulfonic acidbismuth methanesulfonate solution,the cathode current efficiency for bismuth electrodeposition could reach over 99%,with DC power consumption per ton of bismuth below 900 kW·h/t and cathode bismuth purity exceeding 99.90%.However,the bismuth surface is rough,which could be mitigated by methods such as adding surfactants.The methanesulfonic acid-based membrane electrodeposition process for bismuth proposed in this study is suitable for treating iron-rich bismuth-containing electrolyte.