Study on the removal of iron impurities in methanesulfonic acid tin plating bath

3rd International Conference on Energy Equipment Science and Engineering

Hou-Li, L.I.U.^1 ; Jian-Jun, Chen^1 ; Hong-Liang, P.A.N.^1

School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai

200237, China^1

关键词: Adsorption efficiency;    Cation exchange resins;    Energy spectra;    Iron impurities;    Methane sulfonic acid;    pH regulation;    Plating bath;    Recovery rate;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/128/1/012190/pdf
DOI  :  10.1088/1755-1315/128/1/012190

来源: IOP

【 摘 要 】

This thesis investigated the the influence of sodium sulfite as reducing agent on the recovery rate of tin ion. The approach is that HZ016 type cation exchange resin was used to adsorb Sn2+ and Fe2+ in electroplated tin solution first. After adsorption, the resin was removed by sulfuric acid, which was added with NaOH to adjust pH value to form precipitation and separate tin. X-ray diffraction (XRD) and energy spectrum (EDS) method were used to analyze the composition of the precipitates adjusted by pH. The results show that when the mass ratio of resin to bath is 1:2, the adsorption efficiency of resin reaches 98.3% and 97.1% respectively, and the elution efficiency of tin and iron reaches 95.1% and 94% respectively when the mass ratio of resin to eluent sulfuric acid is 1:4. Sodium sulfite was added to increase the efficiency of tin recovery by 8.1%. EDS and XRD atlas showed that after pH regulation, the main composition of the filtration precipitation was the hydroxides of tin.