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Enhanced recovery of high-purity Fe powder from iron-rich electrolytic manganese residue by slurry electrolysis
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作者 Wenxing Cao jiancheng shu +5 位作者 Jiaming Chen Zihan Li Songshan Zhou shushu Liao Mengjun Chen Yong Yang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第3期531-538,共8页
Iron-rich electrolytic manganese residue(IREMR)is an industrial waste produced during the processing of electrolytic metal manganese,and it contains certain amounts of Fe and Mn resources and other heavy metals.In thi... Iron-rich electrolytic manganese residue(IREMR)is an industrial waste produced during the processing of electrolytic metal manganese,and it contains certain amounts of Fe and Mn resources and other heavy metals.In this study,the slurry electrolysis technique was used to recover high-purity Fe powder from IREMR.The effects of IREMR and H2SO4 mass ratio,current density,reaction temper-ature,and electrolytic time on the leaching and current efficiencies of Fe were studied.According to the results,high-purity Fe powder can be recovered from the cathode plate,and the slurry electrolyte can be recycled.The leaching efficiency,current efficiency,and purity of Fe reached 92.58%,80.65%,and 98.72wt%,respectively,at a 1:2.5 mass ratio of H2SO4 and IREMR,reaction temperature of 60℃,electric current density of 30 mA/cm^(2),and reaction time of 8 h.In addition,vibrating sample magnetometer(VSM)analysis showed that the coercivity of electrolytic iron powder was 54.5 A/m,which reached the advanced magnetic grade of electrical pure-iron powder(DT4A coercivity standard).The slurry electrolytic method provides fundamental support for the industrial application of Fe resource recovery in IRMER. 展开更多
关键词 iron-rich electrolytic manganese residue slurry electrolysis high-purity iron powder leaching efficiency current efficiency
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Enhanced Mn^(2+)solidification and NH_(4)^(+)-N removal from electrolytic manganese metal residue via surfactants
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作者 jiancheng shu Xiangfei Zeng +4 位作者 Danyang Sun Yong Yang Zuohua Liu Mengjun Chen Daoyong Tan 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2022年第9期205-212,共8页
Electrolytic manganese metal residue(EMMR)harmless treatment has always lacked a low-cost and quick processing technology.In this study,surfactants,namely tetradecyl trimethylammonium chloride(TTC),sodium dodecyl benz... Electrolytic manganese metal residue(EMMR)harmless treatment has always lacked a low-cost and quick processing technology.In this study,surfactants,namely tetradecyl trimethylammonium chloride(TTC),sodium dodecyl benzene sulfonate(SDBS),sodium lignin sulfonate(SLS),and octadecyl trimethylammonium chloride(OTC),were used in the solidification of Mn^(2+)and removal of NH_(4)^(+)-N from EMMR.The Mn^(2+)and NH_(4)^(+)-N concentrations under different reaction conditions,Mn^(2+)solidification and NH_(4)^(+)-N removal mechanisms,and leaching behavior were studied.The results revealed that the surfactants could enhance the Mn^(2+)solidification and NH_(4)^(+)-N removal from EMMR,and the order of enhancement was as follows:TTC>SDBS>OTC>SLS.The NH_(4)^(+)-N and Mn^(2+)concentrations were 12.3 and 0.05 mg·L^(-1)with the use of 60.0 mg·kg^(-1)TTC under optimum conditions(solid–liquid ratio of 1.5:1,EMMR to BRM mass ratio of 100:8,temperature of 20℃,and reaction duration of 12 h),which met the integrated wastewater discharge standard(GB8978-1996).Mn^(2+)was mainly solidified as Mn(OH)_(2),MnOOH and MnSiO_(3),and NH_(4)^(+)-N in EMMR was mostly removed in the form of ammonia.The results of this study could provide a new idea for cost-effective EMMR harmless treatment. 展开更多
关键词 Electrolytic manganese metal residue Mn^(2+)solidification NH_(4)^(+)-N removal SURFACTANTS
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Copper fractal growth during recycling from waste printed circuit boards by slurry electrolysis
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作者 Jiqin Wang Xiaoxia Yi +5 位作者 Xiangfei Zeng shuyuan Chen Rui Wang jiancheng shu Mengjun Chen Zhengxue Xiao 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2021年第6期271-280,共10页
Superfine copper particles could be directly prepared from waste printed circuit boards by slurry electrolysis.Meanwhile,copper fractal growth could be observed.To better understand this phenomenon,the factors that af... Superfine copper particles could be directly prepared from waste printed circuit boards by slurry electrolysis.Meanwhile,copper fractal growth could be observed.To better understand this phenomenon,the factors that affect copper dendrites in a point-cathode system were discussed in detail.These results showed that the fractal degree of copper dendrites increased as the increase of applied voltage and the decrease of copper sulfate and gelatin concentrations.Sodium lauryl sulfate and hydrochloric acid concentrations could not significantly impact the fractal degree of copper dendrites,while gelatin concentration could.The minimum copper fractal dimension was 1.069 when gelatin and copper sulfate concentration was 120 mg/L and 0.1 mol/L,respectively with an applied voltage of 11 V.Moreover,the results diffusion-limited aggregation model demonstrated that particle translational speed,particle numbers and binding probability significantly affected copper dendrite patterns.The scanning electron microscopy results indicated that the three additives greatly affected the refinement of the copper crystal.These findings contribute to enrich the theoretical study on metals recovery from e-waste by slurry electrolysis. 展开更多
关键词 Dendritic copper Fractal growth WPCBs Slurry electrolysis
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