本文選題：合金廢料 + 膜電解��； 參考：《江蘇理工學院》2015年碩士論文

【摘要】：膜電解技術(shù)應用于合金廢料中相關(guān)金屬的分離具有成本低、效率高、金屬純度高、環(huán)境友好等優(yōu)點。本論文以鎳鐵錫合金廢料為原料,研究合金廢料的膜電解工藝、陽極液中錫鐵的化學回收工藝、膜電解回收制備金屬鎳,并用XRD和SEM等現(xiàn)代技術(shù)對回收產(chǎn)品進行了表征。以合金廢料作為可溶性陽極,采用隔膜電解方式對其進行電化學溶解,在電解電壓為1.5 V,陽極液酸度1.0 mol/L,Na Cl濃度為1.5 mol/L,溫度為35℃,極距為30 mm的條件下電解6 h,可以得到鎳離子濃度約為15 g/L的陽極液,平均電流效率為96.32%,能耗0.9262 k W·h/kg。以沉淀法分離回收陽極液中Sn2+,考察了p H值、陳化時間等對回收錫的影響。在p H=3.5,陳化時間為24 h時,陽極液中錫的回收率可達99.99%�？疾炝瞬煌恋韯�、焙燒時間、焙燒溫度對Sn O2粒度的影響。以氨水為沉淀劑,在450℃下焙燒2 h可制備出晶形優(yōu)良的Sn O2粉末,粒徑分布范圍窄,平均粒徑約為100 nm。用針鐵礦法沉淀分離除錫后的陽極液中的Fe2+,經(jīng)高溫焙燒得到Fe2OpH值、反應溫度、反應時間、陳化時間等對鐵分離的影響較大,通過優(yōu)化實驗得到最佳分離條件為:p H=3.5,溫度為90℃,反應時間為2 h,陳化時間為8 h。在此條件下鐵的回收率為99.75%。沉淀在650℃下焙燒2 h可得到結(jié)晶度較好的Fe2O3晶體。用陰離子交換膜反應器作為電解槽,除錫鐵后的溶液作為陰極液,電解回收溶液中的鎳�？疾炝穗娊鈺r間、電流密度、p H值、電解溫度及硼酸濃度對電解過程中的電流效率和電耗的影響。在電流密度300 A/m2,p H=4,硼酸濃度為25 g/L,35℃下電解10 h,鎳的回收率為95.432%,電耗為9.6237 k W·h·kg-1,回收的鎳純度為94.69%。
[Abstract]:The application of membrane electrolysis in the separation of related metals in alloy scrap has the advantages of low cost, high efficiency, high metal purity and environmental friendliness.In this paper, the membrane electrolysis process of Ni-Fe-Sn alloy scrap, the chemical recovery process of tin and iron in anodic solution and the preparation of nickel metal by membrane electrolysis were studied. The recovered products were characterized by XRD and SEM.The alloy waste is used as the soluble anode. The electrolytic solution is dissolved by diaphragm electrolysis. When the electrolytic voltage is 1.5 V, the pH of the anodic solution is 1.0 mol / L ~ (-1) mol / L, the concentration of NaCl is 1.5 mol / L, and the temperature is 35 鈩，

本文編號：1769042