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MINERALOGICAL FEATURESOF THE EXPANDED VERMICULITE ORES
Steklo i Keramika, 2022The natural minerals of the Tebinbulak deposit, which are used as a thermal insulation material, have been studied, while their swelling coefficient depends on the size of the raw material and ranges from 3.47 to 7.67. The structure of the material has been studied by X-ray diffraction and infrared spectroscopy.
M. K. Rumi +7 more
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Materials Research Innovations, 2012 Four different composite mixtures with varying amounts of expanded vermiculite were exposed to high temperatures of 300, 600, 900 and 1100 degrees C for 6 h.
Fuat Koksal, W Brostow
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Heating temperature effect on the hygroscopicity of expanded vermiculite
Ceramics International, 2021Abstract The hygroscopicity of expanded vermiculite is one of major influence factors for thermal insulating performance. To explore the water absorption properties of expanded vermiculite prepared via electrical heating method, heating temperature effect on the hygroscopicity of expanded vermiculite was investigated under various humidity ...
Jinpeng Feng +3 more
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Expanded vermiculite as an alternative adsorbent for the dysprosium recovery
Journal of the Taiwan Institute of Chemical Engineers, 2021Abstract Background Dysprosium (Dy) is a critical resource for developing high-tech green energies, and its growing demand implying the need to recover it from secondary sources. Due to the known stability, availability, and high cation exchange capacity, adsorption on vermiculite can be promisor for this purpose. Methods This work evaluated the
Giani de Vargas Brião +2 more
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Expanded vermiculite as heat insulation material
Refractories, 1975A heat insulation material of apparent density 0.5–0.6 g/cm3 and a refractoriness of 1500–1600°C was produced from expanded vermiculite, and a technology for producing ceramic vermiculite heat-insulation slabs was developed.
V. S. Spirina, M. I. Flerova
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An unusually expandable low-charge vermiculite
Clay Minerals, 1987AbstractA lamellar macroscopic Mg-vermiculite from Santa Olalla, Spain, which is accompanied by some talc and mica, shows a reversible expansion on glycolation due to the presence of layers with two different charges. The most probable origin of the vermiculite is by low-temperature hydrothermal transformation of phlogopite.
A. Justo +3 more
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Preparation of Expanding Vermiculite by Chemical and Microwave Methods
Advanced Materials Research, 2010Based on the characters of expanding and layer adsorbing of vermiculite，industrial vermiculite samples from Weili Mine of Xinjiang Province were expanded by both chemical and microwave chemical methods. The influences to the exfoliation ratio of different parameters such as concentration of hydrogen peroxide, power of the microwave, heating time, ratio
Zhao Miao +3 more
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Effect of expanded vermiculite on aging properties of bitumen
Construction and Building Materials, 2012Abstract Expanded vermiculite (EVMT) clays modified bitumen was prepared by using EVMT, cetyltrimethyl ammonium bromide (CTAB)–EVMT and octadecyl dimethyl benzyl ammonium chloride (ODBA)–EVMT as modifiers. The morphology characteristic of the modified bitumen was investigated by X-ray diffraction (XRD). The binders were aged by pressure aging vessel (
Henglong Zhang +2 more
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Preparation and application of expanded and exfoliated vermiculite: A critical review
Chemical Physics, 2021Abstract Vermiculite (VMT) has a unique characteristic of volume expansion after heating, forming highly porous material called expanded VMT, which can be further exfoliated into two-dimensional nanosheets. In this review, we summarized the preparation methods of expanded and exfoliated VMT, as well as the preparation mechanism.
Mingliang Li +5 more
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Dysprosium adsorption on expanded vermiculite: Kinetics, selectivity and desorption
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2021Abstract Dysprosium obtainment from secondary sources is a current theme in the scientific scenario due to the high demand and environmental issues related to primary production. Hydrometallurgy applied to urban mines can be a potential alternative to separate and recover critical metals as dysprosium.
Giani Vargas Brião +2 more
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