了解澳大利亚高岭土中的铁杂质及其对粘土酸和热活化过程的影响,ACS Omega

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了解澳大利亚高岭土中的铁杂质及其对粘土酸和热活化过程的影响
ACS Omega ( IF 3.7 ) Pub Date : 2023-02-06 , DOI: 10.1021/acsomega.2c06795
Bhabananda Biswas _{1,

2,

3} , Md Rashidul Islam _{1,

2} , Amal Kanti Deb _{1,

2} , Anthony Greenaway ₄ , Laurence N Warr ₃ , Ravi Naidu _{1,

2}

Affiliation

在粘土矿床中经常遇到高岭土矿物晶体结构或附属物质中存在的铁杂质。由于了解铁的位置和状态在通过活化改变粘土的特性时至关重要，因此根据这种金属的数量和位置很好地表征新矿床很重要。西澳大利亚 Noombenberry 矿床已被确定为主要由埃洛石和高岭石组成的大量高岭土资源。我们从一百个钻孔中抽取了六个，并根据主要矿物和铁杂质将它们分组。首先，我们对它们进行表征以了解铁杂质的来源。然后，我们对样品进行了三个物理化学活化过程，包括酸处理（通过 3 M HCl）、600 °C 加热以及两者的组合。最先进的工具，包括 X 射线衍射、X 射线光电子能谱、扫描和透射电子显微镜以及核磁共振，揭示了高岭土的特性、铁杂质以及活化后发生的变化。发现铁杂质与非高岭土矿物有关，即在云母或伊利石中。一旦铁主要通过酸活化去除，表面积、孔体积和负表面电荷就会增加，这对于富含埃洛石的样品来说非常重要。这些特性有助于吸附 N 发现铁杂质与非高岭土矿物有关，即在云母或伊利石中。一旦铁主要通过酸活化去除，表面积、孔体积和负表面电荷就会增加，这对于富含埃洛石的样品来说非常重要。这些特性有助于吸附 N 发现铁杂质与非高岭土矿物有关，即在云母或伊利石中。一旦铁主要通过酸活化去除，表面积、孔体积和负表面电荷就会增加，这对于富含埃洛石的样品来说非常重要。这些特性有助于吸附 N₂气与生高岭土相比。因此，了解铁在伴生矿物中的位置和状态及其溶解/保留可能会扩大气体吸附材料开发的范围。它们还可用于其他应用，如粘土纯化和吸附剂或添加剂配方。

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Understanding Iron Impurities in Australian Kaolin and Their Effect on Acid and Heat Activation Processes of Clay

Iron impurities present in the crystal structure of kaolin minerals or in accessory species are frequently encountered in clay deposits. As knowledge of the location and states of the iron is crucial when modifying the properties of clays by activation, it is important that new deposits are well characterized in terms of the amount and location of this metal. The Western Australia Noombenberry deposit has been identified as a large resource of kaolin composed largely of halloysite and kaolinite. We sampled six from one hundred drill holes and grouped them according to major mineral and iron impurities. First, we characterized them to understand the source of iron impurities. Then, we performed three physicochemical activation processes of samples involving acid treatment (by 3 M HCl), heating at 600 °C, and a combination of both. State-of-the-art tools, including X-ray diffraction, X-ray photoelectron spectroscopy, scanning and transmission electron microscopy, and nuclear magnetic resonance, revealed the properties of kaolin, iron impurities, and the changes incurred after activation. The iron impurities were found to be linked to non-kaolin minerals, i.e., in mica or illite. Once the iron was removed mainly by acid activation, the surface area, pore volume, and negative surface charges increased, and that was significant for halloysite-rich samples. These properties helped adsorb N₂ gas compared to the raw kaolin. Therefore, knowing the iron’s location and states in associated mineral species and their dissolution/retention may expand the scope of material development for gas adsorption. They are also useful in other applications like clay purification and adsorbent or additive formulations.

更新日期：2023-02-06

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