化工环保2025，Vol.45Issue(2)：248-254,7.DOI:10.3969/j.issn.1006-1878.2025.02.012
锂矿选矿尾泥增白工艺及其应用
Whitening process and application of lithium ore tailings
摘要
Abstract
The lithium ore tailings were treated with thiourea dioxide(TD)reduction and oxalic acid complexation process.The effect of different factors on the tailing whitening was investigated by orthogonal experiment.The process conditions of tailing whitening were optimized,and the application properties of whitened tailings in ceramics and C.I.pigment yellow 65(P.Y.65)modification were tested.The orthogonal experiment results show that the influence of the factors on the tailing whiteness in descending order is oxalic acid dosage>complexation time>TD dosage>NaOH/TD molar ratio>temperature>reduction time.Based on the process cost control,the appropriate process conditions for tailing whitening were selected as follows:temperature of 40℃,TD dosage of 0.6%(measured by the mass of tailings,the same below),NaOH/TD molar ratio of 2.0,reduction time of 10 min,oxalic acid dosage of 4%,and complexation time of 60 min.Under these conditions,the content of Fe2O3(w)in the whitened tailings decreases from 1.3%to 0.7%.Additionally,the content of Al2O3 and SiO2 shows negligible changes,and the whiteness is 74.1%.The dry whiteness value of ceramic products fabricated with whitened tailings is 61.2%,which meets the requirement of the first grade in the recommended index of the white porcelain whiteness of GB/T 3532-2022.When the whitened tailing dosage reaches up to 30%(measured by P.Y.65,the same below),the particle size distribution of modified pigment decreases from 360-2 200 nm to 320-1 200 nm,and it concentrates in 500-800 nm.In addition,when the whitened tailing dosage is 15%,the total color aberration between the modified pigment and P.Y.65 is only 0.71.关键词
锂矿选矿尾泥/除铁增白/二氧化硫脲/草酸/尾泥资源化Key words
lithium ore tailings/iron removal for whitening/thiourea dioxide/oxalic acid/tailing reuse分类
环境科学引用本文复制引用
曹凌云,李斌,李梅彤,费学宁,赵洪宾,焦刚珍..锂矿选矿尾泥增白工艺及其应用[J].化工环保,2025,45(2):248-254,7.基金项目
天津市科技支撑重点项目(22YFZCSN00020) （22YFZCSN00020）
天津市技术创新引导专项(23YDTPJC00410) （23YDTPJC00410）
天开高教科创园企业研发专项(23YFZXYC00019). （23YFZXYC00019）
