expanded vermiculite
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Fuel ◽  
2022 ◽  
Vol 315 ◽  
pp. 123165
Author(s):  
Henglong Zhang ◽  
Huan Luo ◽  
Haihui Duan ◽  
Jiawen Cao

Author(s):  
Henrique Santana de Carvalho Neves ◽  
Thiago Lopes da Silva ◽  
Meuris Gurgel Carlos da Silva ◽  
Reginaldo Guirardello ◽  
Melissa Gurgel Adeodato Vieira

2021 ◽  
Vol 16 (4) ◽  
pp. 370-388
Author(s):  
Tatiana K. Ivanova ◽  
Marina V. Slukovskaya ◽  
Irina A. Mosendz ◽  
Evgeniya A. Krasavtseva ◽  
Victoria V. Maksimova ◽  
...  

Layered silicates, such as serpentine and vermiculite, have properties that make it possible to use materials based on them as components of environmental technologies. The possibility of soil remediation in industrially contaminated area, formed due to the long-term exposure to emissions from copper-nickel production (Monchegorsk, Murmansk region), was studied. Two materials were used as ameliorants in our study: expanded vermiculite and granular serpentine sorbent, a waste after using the purification technology of highly concentrated solutions from metals. These materials have a high sorption activity to several metals, a high specific surface area, the ability to retain moisture, and are available in quantities sufficient to work on the remediation of large areas. A study of the physicochemical properties of industrially polluted soil and ameliorants, direct phytotoxicity testing of podzol and its mixtures with expanded vermiculite and the serpentine sorbent (test plants - common oat Avna satva L. and red clover Trifolium pratnse L.) were carried out. The study results showed that the proposed materials were effective additives for increasing the pH of acidic soil, sorption and precipitation of Al and potentially toxic metals - Cu, Ni, Pb, Fe, and improving the soil hydrophysical and agrochemical characteristics. A positive response of test plants to the introduction of ameliorants into industrially contaminated soil was noted.


Author(s):  
Osman Gencel ◽  
Olga Kizinievic ◽  
Mucahit Sutcu ◽  
Ertugrul Erdogmus ◽  
Pedro Muñoz Velasco ◽  
...  

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1371
Author(s):  
Duc Cuong Nguyen ◽  
Trung Tuyen Bui ◽  
Yeong Beom Cho ◽  
Yong Shin Kim

Expanded vermiculite (eVMT) has been studied as a risk-free, general-purpose absorbent for liquid hazards due to its excellent thermal and chemical stability. Here, vermiculite was expanded by two steps: exfoliation by 30 wt% H2O2 treatment at 60 °C and subsequent expansion by microwave heating. This two-step expansion produced more homogenously separated concertina-like eVMTs with a higher total pore volume of 7.75 cm3 g−1 than the conventional thermal method. The two-step eVMT was found to be greatly superior to the thermal and commercial silver counterparts in hazardous liquid-uptake performance. The uptake was simply interpreted as a physical infilling process of a liquid into the eVMT pores, and the spontaneous hazard removal with a great capacity was discussed with the large pore volume of two-step eVMT and its suitable pore dimensions for capillary action. As a practical device, a prototype absorbent assembly made of these eVMTs demonstrated the successful mitigation of liquid hazards on an impermeable surface.


Fuel ◽  
2021 ◽  
Vol 306 ◽  
pp. 121731
Author(s):  
Henglong Zhang ◽  
Haihui Duan ◽  
Huan Luo ◽  
Caijun Shi

Author(s):  
Giani Vargas Brião ◽  
Meuris Gurgel Carlos da Silva ◽  
Melissa Gurgel Adeodato Vieira
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