Physicochemical Investigations of Vermiculite – Microporous Component for Heat-Resistant Materials

Bazhirov, Tynlybek; Protsenko, V. S.; Bazhirov, Nurlybek S.; Dauletiyarov, M. S.; Serikbayev, Bazarbay; Bazhirova, K. N.

doi:10.32014/2019.2518-1491.65

Cited by 4 publications

(6 citation statements)

References 5 publications

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“…Due to this, high accelerations up to 100 g are achieved in the mill, and as a result, not only fine grinding is achieved, but also the appearance of defects in the crystalline structure of the material, as well as partial amorphization of the surface layer of the ground particles. The intensity of effects of grinding bodies in activator-type mills can be ten times higher than their effects in ball mills, in which impacts occur only due to the acceleration of the free fall of steel balls equal to 1 g. At the same time, in ordinary ball mills, only two mechanical actions can occur at the same time: impact and abrasion [46].…”

Section: Discussionmentioning

confidence: 98%

Acid-Free Processing of Phosphorite Ore Fines into Composite Fertilizers Using the Mechanochemical Activation Method

Bazhirova,

Zhantasov,

Bazhirov

et al. 2024

J. Compos. Sci.

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The relevance of involving substandard raw materials for the production of composite phosphorus-containing fertilizer production is significant due to the problem of providing food products for the growing population of the Earth. The main raw materials for phosphorus and composite phosphorus-containing fertilizer production are natural phosphate ores—phosphorites. However, in the process of mining and crushing, ~55–60% phosphorite ore fines are formed—a fraction of less than 10 mm, which is unsuitable for traditional processing into composite phosphorus-containing fertilizers. This article presents the results of physicochemical studies of the substandard fine fraction of phosphorite ore and the results of the studies of the possibility of their direct processing into phosphorus and composition of phosphorus-containing fertilizers using methods of mechanical and mechanochemical activation in the “Activator 4” planetary mill. The findings of the studies performed confirm the rather high efficiency of phosphorite ore fines’ mechanical activation and phosphorite-containing mixtures’ mechanochemical activation, which make it possible to significantly increase the content of assimilable phosphorus pentoxide P2O5 in composite phosphorus-containing fertilizers. The proposed innovative technology has fundamental differences from existing technologies, since the mechanochemical activation of a mixture of phosphorite ore fines and functional components will allow for direct acid-free and waste-free processing into phosphorus and composite phosphorus-containing mineral fertilizers.

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Section: Discussionmentioning

confidence: 98%

Acid-Free Processing of Phosphorite Ore Fines into Composite Fertilizers Using the Mechanochemical Activation Method

Bazhirova,

Zhantasov,

Bazhirov

et al. 2024

J. Compos. Sci.

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“…Upon high-temperature calcination, the interlayer water in vermiculite evaporates, causing the material to expand [25]. Vermiculite exhibits characteristics such as cation exchange [26], adsorption [27], heat insulation, fire resistance [28], and chemical stability. This versatile material finds broad applications in areas such as adsorbents [29], catalyst carriers [30], and phase change energy storage materials [31].…”

Section: Introductionmentioning

confidence: 99%

Study on Preparation and Humidity-Control Capabilities of Vermiculite/Poly(sodium Acrylate-acrylamide) Humidity Controlling Composite

Xue,

Wang,

Diao

et al. 2024

Materials

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This paper focuses on the preparation and evaluation of a novel humidity-control material, vermiculite/(sodium polyacrylate(AA)–acrylamide(AM)), using inverse suspension polymerization. Acrylic acid and acrylamide were introduced into the interlayer of modified vermiculite during the polymerization process, leading to the formation of a strong association with the modified vermiculite. The addition of vermiculite increased the specific surface area and pore volume of the composites. To investigate the moisture absorption and desorption properties of the composites, an orthogonal experiment and single-factor experiment were conducted to analyze the impacts of vermiculite content, neutralization degree, and the mass ratio of AA to AM. According to the control experiment, the addition of vermiculite was found to enhance the pore structure and surface morphology of the composite material, surpassing both vermiculite and PAA-AM copolymer in terms of humidity control capacity and rate. The optimal preparation conditions were identified as follows: vermiculite mass fraction of 4 wt%, a neutralization degree of 90%, and mAA:mAM = 4:1. The moisture absorption rate and moisture release rate of the composite material prepared under these conditions are 1.285 g/g and 1.172 g/g. The humidity control process of the composite material is governed by pseudo second-order kinetics, which encompasses the complete adsorption process. These results indicate that the vermiculite/PAA-AM composite humidity control material has excellent humidity control performance and is a simple and efficient humidity control method.

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“…During the last years, the special attention of scientists is drawn to the study of creep of lightweight concretes effecting the performance of bearing and envelope structures . The works [7][8][9][10][11] and others contain various suggestions on the factoring creep deformation in when carrying out structural analysis on discrete structures and structural members. These works mostly consider linear creep theory resolving the strain-stress dependencies to integral equations, whereas strain in each particular moment of time depends on both actual stress and the stress applied earlier.…”

Section: Introductionmentioning

confidence: 99%

“…In the papers [7][8][9][10][11], it was supposed that creep deformation of concrete is proportional to stresses while their growth rate depends only on the concrete age and lowers with its ageing. Along with that, elastic afterworking is neglected and is assumed that the stresses applied earlier do not affect the rate of total deformation.…”

Section: Introductionmentioning

confidence: 99%

The Study of Creep and Deformation Properties of Sulfur-Containing Arbolit Exposed to Various Compression Stresses

Sokolova

Akulova

Isakulov³

et al. 2021

KEM

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The present paper considers the study of creep and deformation properties of sulfur-containing arbolit exposed to various compression stresses. Investigating the creep of lightweight arbolit concretes greatly affecting the performance of bearing and envelope structures draws a special attention during the last years. This issue is of particular relevance in the regions with hot and sharp continental climate. Arbolit concrete is one of the lightest building materials with low thermal conductivity and good soundproof properties. The modern postulates of theory and practice of creation, development of high-strength arbolit concretes on the base of composite sulfur-containing binders have become the methodological framework of the present research. While carrying out scientific research, the following standard measuring and analysis methods of physical and mechanical properties have been used for sulfur-containing arbolit composites. Experimental tests have been implemented on the 28-days samples made of sulfur-containing arbolit, with the cotton plant footstalks as an organic component. The researched samples were vapor sealed with the purpose to eliminate overlapping the processes of contraction and creep. The experimental results have shown that the analysis of prisms deformation in time demonstrates certain derivation from the pattern. Deformation of prisms made of sulfur-containing arbolit loaded at the low stress level were growing at a slower rate that the same deformations at a higher stress level. No derivation has been observed for the prisms of sulfur-containing haydite concrete. For both types of concrete, creep deformation has reached the values exceeding completely recoverable deformation by a factor of 2 or all the samples, the rapid growth of creep deformation has been observed after loading, followed by the gradual slowdown of deformation growth. For sulfur-containing lightweight concretes, as the test shown, the rate of creep deformation growth depends on the hardening curve in time reflecting the process of concrete hardening. This, if compared with sulfur-containing lightweight concretes, creep of sulfur-containing arbolit concrete is significantly lower that eventually leads to the loss of creep deformation at the same stress level. The obtained results can be used when manufacturing an efficient wall material for residential construction, including seismic areas.

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Physicochemical Investigations of Vermiculite – Microporous Component for Heat-Resistant Materials

Cited by 4 publications

References 5 publications

Acid-Free Processing of Phosphorite Ore Fines into Composite Fertilizers Using the Mechanochemical Activation Method

Acid-Free Processing of Phosphorite Ore Fines into Composite Fertilizers Using the Mechanochemical Activation Method

Study on Preparation and Humidity-Control Capabilities of Vermiculite/Poly(sodium Acrylate-acrylamide) Humidity Controlling Composite

The Study of Creep and Deformation Properties of Sulfur-Containing Arbolit Exposed to Various Compression Stresses

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