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首页> 外文期刊>Colloids and Interfaces >Fabrication of Silica Microspheres (HB/A@SI-MNS) for Hafnium and Zirconium Recovery from Zirconyl Leach Liquor
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Fabrication of Silica Microspheres (HB/A@SI-MNS) for Hafnium and Zirconium Recovery from Zirconyl Leach Liquor

机译：二氧化硅微球的制备（HB / A @ SI-MNS），用于从锆基浸出液中回收Ha和锆

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This work describes the synthesis of silica microspheres using sodium silicate obtained as a byproduct in the production of Egyptian Rosetta zircon concentrate. The obtained mesoporous silica microspheres were further modified with aminopropyltriethoxy silane and 2,4-Dihydroxybenzaldehyde to produce Schiffa??s base silica sorbent (HB/A@Si-MNS). HB/A@Si-MNS was used for the selective extraction of hafnium from zircon mineral leach liqueur. The fabrication process and surface properties of HB/A@Si-MNS were confirmed by the means of X-ray Fluorescence (XRF), scanning electron microscop (SEM), energy depressive X-ray (EDX), Fourier-transform infrared spectroscopy (FT-IR), and elemental analysis. The uptake behavior of HB/A@Si-MNS towards Zr(IV) and Hf(IV) ions were studied under different experimental conditions. Adsorption curves indicate that the uptake of Zr(IV) and Hf(IV) on HB/A@Si-MNS is a spontaneous, endothermic monolayer system controlled by intraparticle diffusion. Elution efficiencies were found to be 94% and 98% for Zr(IV) and Hf(IV), respectively. The regenerated HB/A@SI-MNS showed uptake capacity comparable to that of fresh ones over 3 cycles. The results of the extraction of Hf(IV) than Zr(IV) from Rosetta zircon concentrate show that HB/A@SI-MNS has a preferential selectivity towards Hf(IV) than Zr(IV). Therefore, the studied material may be promising for the selective separation of Hf(IV) from Zr(IV).
机译：这项工作描述了使用埃及酸钠Rosetta锆石精矿生产中获得的副产品硅酸钠合成二氧化硅微球。所得的介孔二氧化硅微球用氨丙基三乙氧基硅烷和2，4-二羟基苯甲醛进一步改性，以制得席氏碱式二氧化硅吸附剂（HB / A @ Si-MNS）。 HB / A @ Si-MNS用于从锆石矿浸液中选择性提取extraction。通过X射线荧光（XRF），扫描电子显微镜（SEM），能量抑制X射线（EDX），傅立叶变换红外光谱（X射线荧光法）证实了HB / A @ Si-MNS的制备工艺和表面性能。 FT-IR）和元素分析。在不同的实验条件下研究了HB / A @ Si-MNS对Zr（IV）和Hf（IV）离子的吸收行为。吸附曲线表明，HB / A @ Si-MNS上Zr（IV）和Hf（IV）的吸收是受颗粒内扩散控制的自发吸热单层系统。发现Zr（IV）和Hf（IV）的洗脱效率分别为94％和98％。再生的HB / A @ SI-MNS在3个周期内的吸收能力与新鲜的HB / A @ SI-MNS相当。从罗塞塔锆石精矿中提取比Zr（IV）Hf（IV）的结果表明，HB / A @ SI-MNS对Hf（IV）的选择性高于Zr（IV）。因此，所研究的材料可能对从Zr（IV）选择性分离Hf（IV）很有希望。

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