摘要
采用酸法提取粉煤灰等非铝土矿矿产中的氧化铝,由于不需要考虑含铝矿物中的铝硅比,所以较传统碱法提铝更具有优势,但用酸法处理矿物会使大量铁杂质进入工艺流程。以某企业正在实施的高铝粉煤灰盐酸法制备冶金级氧化铝工艺流程为对象,研究AlCl_(3)-FeCl_(3)/FeCl_(2)-H_(2)O溶液体系电解除铁影响因素。结果表明:当初始溶液组成为AlCl_(3)浓度200 g/L、Fe^(3+)浓度5 g/L的条件下,采用钛板阴极控制溶液pH值恒定在1.0。同时,体系温度维持在60℃,阴极电流密度为0.12 A/cm^(2)。在此条件下进行恒流电解,可在300 min内将溶液中总Fe浓度降低至0.138 g/L。
The acid method for extracting aluminum oxide from non-bauxite minerals,such as fly ash,offers advantages over the traditional alkali method,particularly because it does not require consideration of the alu⁃minum-silica ratio in aluminum-containing minerals.However,the use of acid treatment introduces significant amounts of iron impurities into the process.Taking the process of producing metallurgical-grade aluminum ox⁃ide from high-aluminum fly ash using hydrochloric acid by a company as a case study,this study investi⁃gates the factors influencing iron removal by electrolysis in the AlCl_(3)-FeCl_(3)/FeCl_(2)-H_(2)O solution system.The results indicate that under specific conditions,namely,an initial solution composition with AlCl₃concentration at 200 g/L,Fe^(3+) concentration at 5 g/L,a titanium plate cathode maintaining a constant solution pH of 1.0,a system temperature of 60℃,and a cathode current density of 0.12 A/cm^(2)during constant current electroly⁃sis,the total iron concentration in the solution can be reduced to 0.138 g/L within 300 minutes.
作者
翟凯雄
ZHAI Kaixiong(China Shenhua Haerwusu Opencast Coal Mine Circular Economy Industry Incubation Base,Junggar Banner,Inner Mongolia,010300)
出处
《能源科技》
2025年第3期71-74,80,共5页
Energy Science and Technology
关键词
高铝粉煤灰
盐酸法提铝
电解除铁
High-aluminum fly ash
aluminum extraction by hydrochloric acid method
iron removal by elec⁃trolysis
