Application microwave radiation for directional changes of layered silicates properties

Gerasimov, A. M.; Eremina, O. V.

doi:10.17580/em.2021.01.11

Cited by 2 publications

(3 citation statements)

References 20 publications

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“…The majority of silicates, including kaolin, vermiculite, glauconite, talc, and those composing rocks for other minerals exhibit a layered structure [56]. The crystal structure of these layered silicates is built upon two types of structural elements: silicon-oxygen tetrahedron and aluminum-oxygen octahedral (both with oxygen and hydroxyl groups), which combine in various configurations [57,58].…”

Section: Structural Features and Framework Types Of Layered Silicatesmentioning

confidence: 99%

Recent advances of silicate materials for wastewater treatment: a review

Xu,

Wang,

2024

Mater. Res. Express

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Heavy metal ions and organic pollutants cause irreversible damage to water environment, thereby posing significant threats to the well-being of organisms. The techniques of adsorption and photocatalytic degradation offer versatile solutions for addressing water pollution challenges, attributed to their inherent sustainability and adaptability. Silicates exhibit exceptional practicality in the realm of environmental protection owing to their structural integrity and robust chemical/thermal stability during hybridization and application process. Furthermore, the abundance of silicate reserves, coupled with their proven effectiveness, has garnered significant attention in recent years. This detailed review compiles and analyzes the extensive body of literature spanning the past six years (2018-2023), emphasizing the pivotal discoveries associated with employing silicates as water purification materials. This review article provides a comprehensive overview of the structure, classification, and chemical composition of diverse silicates and offers a thorough descriptive analysis of their performance in eliminating pollutants. Additionally, the utilization of diatomite as either precursors or substrates for silicates, along with the exploration of their corresponding purification mechanisms is discussed. The review unequivocally verifies the efficiency of silicates and their composites in the effective elimination of various toxic pollutants. However, the development of novel silicates capable of adapting to diverse environmental conditions to enhance pollution control, remains an urgent necessity.

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Section: Structural Features and Framework Types Of Layered Silicatesmentioning

confidence: 99%

Recent advances of silicate materials for wastewater treatment: a review

Xu,

Wang,

2024

Mater. Res. Express

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“…Methodology. In the previous studies, the authors [29] investigated the effect of different types of heating on silicate minerals: montmorillonite, illite, kaolinite, talc, as well as framework silicatequartz, as an essential mineral of sedimentary clay rocks characterized by the minimal effect of water on its structural changes.…”

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confidence: 99%

“…For this analysis, two samples of kaolinite were used: initial (without heat treatment) and after convective heating at 550 C. The choice of temperatures and type of heating are described in detail in the research [29], which states that the types of heating (convective; hydrothermal; in highfrequency currents; and combined) have the same effect on the change in phase composition of the mineral and differ only in the rate at which this effect is achieved. According to this indicator, preference was given to convective heating.…”

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confidence: 99%

Use of clay-containing waste as pozzolanic additives

Gerasimov

Ustinov

Zyryanova

2023

PMI

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Growing productivity of mining and processing enterprises entails an increase in the volumes of liquid tailings impoundments and upstream impoundments of ore processing waste. Enterprises face the challenge of minimizing the environmental impact of waste and guaranteeing the sanitary and epidemiological safety of population. The article presents a possibility of recycling one type of such waste (clay-containing concentration tailings of apatite-nepheline and sylvinite ores, coal beneficiation tailings) by using them after preliminary thermochemical treatment as pozzolanic additives to cements and concretes, including concrete mixtures used for soil stabilization, development of territories, reclamation of mine workings, as a component of the insulating layer of landfills for the disposal of municipal solid waste. An analysis of the phase changes of kaolinite, one of the main minerals that make up clay-containing waste, in the temperature range of 200-1,000 °С showed that a change in its mineral form during heat treatment is the main factor in changing its pozzolanic activity. The effect of heat treatment of clay minerals at temperature of 700-800 °C on their pozzolanic activity, estimated by the ability to absorb calcium hydroxide (0.7 g Ca(OH)2 per 1 g of modified kaolinite), is considered. It is shown that the addition of heat-treated samples (20 % by weight) improves the quality of cement increasing its activity by 15 %, in comparison with the use of unmodified clay minerals. It was proved experimentally that partial replacement of Portland cement with thermally modified kaolinite increases the strength of consolidating stowing mixture by up to 15 %. This approach to processing of ores containing layered silicates, which provides for thermochemical modification of run-of-mine ore, intensifies the processes of tailings thickening and filtering.

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Application microwave radiation for directional changes of layered silicates properties

Cited by 2 publications

References 20 publications

Recent advances of silicate materials for wastewater treatment: a review

Recent advances of silicate materials for wastewater treatment: a review

Use of clay-containing waste as pozzolanic additives

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