Preparation of Expanding Vermiculite by Chemical and Microwave Methods

Zhao Miao; Tong Jiang Peng; Yong Guang Xi; Wei Yang

doi:10.4028/www.scientific.net/AMR.96.155

Paper Titles

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Preparation and Characterization of Polyurethane Rigid Foam/Expanded Perlite Thermal Insulation Composites
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Preparation and Characterization of Tourmaline/TiO₂ Composite Particles Material
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Preparation and Performance of Ag⁺-Zn²⁺-Zeolite Antimicrobial and Antibacterial Plastic
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Preparation of Expanding Vermiculite by Chemical and Microwave Methods
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Preparation of Phase Change Building Materials
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Preparation of Tourmaline Composite Materials and its Property of Far Infrared Radiance
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Preparation of Zn²⁺/Stilbite Composite Particles Material and its Antibacterial Property
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Preparation, Swelling and Water-Retention Properties of Crosslinked Superabsorbent Hydrogels Based on Guar Gum
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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 96Preparation of Expanding Vermiculite by Chemical...

Preparation of Expanding Vermiculite by Chemical and Microwave Methods

Abstract:

Based 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 of solid-liquid, immersion time were discussed. And the expanded mechanism of vermiculite was also analyzed. The results indicate that the expanded times increase with the increasing of concentration of hydrogen peroxide, and the best expanding point appears when the concentration of hydrogen peroxide is 30%. The solid-liquid ratio of vermiculite and hydrogen peroxide has little effect on the expanding of vermiculite. The vermiculite samples could be expanded 8.5 times by heated 2 min under 800W microwave power after immersion for 12 h when the concentration of hydrogen peroxide is 30%. As a result, the vermiculite could be expanded because of the oxygen pressure produced by the decomposition of hydrogen peroxide into the vermiculite interlayer. When using the microwave chemical method, the pressure of both oxygen and interlayer water lead to the increases of the expanded times. And exfoliation vermiculite plays an important part in energy-saving and environmental treatment.