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基于硫酸减量化从钕铁硼废料中选择性转型分离稀土 被引量:3
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作者 汪金良 王龙君 刘付朋 《过程工程学报》 CAS CSCD 北大核心 2020年第8期921-928,共8页
针对现阶段钕铁硼废料中稀土难于经济有效提取的现状,开展了钕铁硼废料硫酸化焙烧选择性分离稀土的研究。结果表明,Fe2(SO4)3亦可使稀土氧化物发生硫酸盐转型,这使硫酸用量显著减少,在硫酸用量为理论量的2.0倍、焙烧温度750℃、焙烧时间... 针对现阶段钕铁硼废料中稀土难于经济有效提取的现状,开展了钕铁硼废料硫酸化焙烧选择性分离稀土的研究。结果表明,Fe2(SO4)3亦可使稀土氧化物发生硫酸盐转型,这使硫酸用量显著减少,在硫酸用量为理论量的2.0倍、焙烧温度750℃、焙烧时间1.5 h条件下,近98%的稀土氧化物在H2SO4,Fe2(SO4)3的共同作用下转化为易分离的硫酸稀土,而铁的浸出率小于0.1%,主要以易于冶炼的赤铁矿(Fe2O3)物相存在于渣中,该工艺实现了硫酸的减量化与钕铁硼废料的综合利用。 展开更多
关键词 钕铁硼废料 选择性分离 减量化 稀土 硫酸
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Effects of Al^(3+)doping on the structure and properties of goethite and its adsorption behavior towards phosphate 被引量:4
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作者 Wei Li longjun wang +5 位作者 Fan Liu Xiaoliang Liang Xionghan Feng Wenfeng Tan Lirong Zheng Hui Yin 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2016年第7期18-27,共10页
Al substitution in goethite is common in soils, and has strong influence on the structure and physicochemical properties of goethite. In this research, a series of Al-doped goethites were synthesized, and characterize... Al substitution in goethite is common in soils, and has strong influence on the structure and physicochemical properties of goethite. In this research, a series of Al-doped goethites were synthesized, and characterized by powder X-ray diffraction(XRD), transmission electron microscopy(TEM), X-ray photoelectron spectroscopy(XPS), Fourier transform infrared spectroscopy(FT-IR) and extended X-ray absorption fine structure(EXAFS)spectroscopy. The adsorption behavior of these samples towards PO43-was also investigated. Characterization results demonstrated that increasing Al content in goethite led to a reduction in crystallinity, increase in specific surface area(SSA), and morphology change from needle-like to granular. Rietveld structure refinement revealed that the lattice parameter a remained almost constant and b slightly decreased, but c was significantly reduced, and the calculated crystal density increased. EXAFS analysis demonstrated that the Fe(Al)–O distance in the structure of the doped goethites was almost the same, but the Fe–Fe(Al) distance decreased with increasing Al content. Surface analysis showed that, with increasing Al content, the content of OH groups on the mineral surface increased. The adsorption of phosphate per unit mass of Al-doped goethite increased, while adsorption per unit area decreased owing to the decrease of the relative proportion of(110) facets in the total surface area of the minerals. The results of this research facilitate better understanding of the effect of Al substitution on the structure and properties of goethite and the cycling of phosphate in the environment. 展开更多
关键词 Goethite Al substitution XRD XAFS Adsorption
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