Thermodynamic Calculations of the Process of Reduction of Boricanhydride by Aluminium

This paper is the continuation of our previous paper. In this work, we optimized the synthesis of aluminum borides by the SHS method. The purpose of the research was to develop the foundations of waste-free technology. The initial components were powders of boric anhydride (B2O3), aluminum (Al), the oxide-heating additive (KNO3), various fluxing additives, including mixed ones. The optimal ratios of the initial components for increasing the yield of aluminum boride with a high boron content and obtaining slag suitable for the production of high-alumina clinkers were determined. Studies have shown that the development of a waste-free technology for producing aluminum borides by the method of self-propagating high-temperature synthesis (SHS) is possible and yields target (alloy) and by-product (slag) products that meet the requirements for chemical and phase composition.

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“…The synthesis of aluminum boride was carried out by the aluminothermic method in the SHS mode [2,12,13].…”

Section: Resultsmentioning

confidence: 99%

Optimization of Aluminum Boride Synthesis in the Self-Propagating High-Temperature Synthesis Mode to Create Waste-Free Technology

et al. 2022

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“…To determine the possibility of the reaction of reduction of boric anhydride with aluminum according to Equation (1), Gibbs energy was calculated depending on the temperature, ranging from 298 to 1900 K. The value of ∆G was determined to be in the range of −548.79 to −273.65 kJ/mol, which indicated that the reaction proceeded in a spontaneous mode. Below 298 K, the process does not occur spontaneously [7].…”

Section: Methodsmentioning

confidence: 96%

Kinetics of the Synthesis of Aluminum Boride by the Self-Propagating High-Temperature Synthesis Method

et al. 2022

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The influence of certain factors on the kinetics of the process of obtaining aluminum borides (burning rate, ingot formation, and phase separation) was investigated. In this study, we report the registration of diboride using the SHS protocol. The synthesis of aluminum diboride from boric anhydride occurred by the aluminothermic method. The initial components were boron trioxide and aluminum in the form of powders. Researchers paid special attention to the degree of grinding of the charge fluxing substances. The influence this had on the rate of development of the degree of charge concentration was studied. To calculate the degree of charge, a composition was chosen according to the speed obtained from a number of experiments where melting was carried out with the following charge densities in g/cm3: 0.80; 1.08; 1.18; 1.74. The method of melting was ignition from above. The experimental results allowed us to conclude that the nature of the change in the combustion rate of the system, where there was an excess of the reducing agent in the charge, is the same. An increase in the combustion rate, where there was an excess of aluminum of up to 20%, was likely due to the fact that the reaction area of the charge components increased. In addition, an increase in speed can be explained by a decrease in heat losses due to a reduction in the melting time. With an increase in excess aluminum above 20% of the stoichiometry, the observed decrease in the combustion rate can be explained by a decrease in the specific heat of the process due to the melting of the excess aluminum, which played the role of a ballast.

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“…Сондықтан да қою қара бидай ашымалының сүт қышқылды бактериаларының өсуі үшін қоректік заттардың қосымша көзі ретінде зығыр дәні тұндырмасын және зығыр ұнын қолданудың перспективтілігі зор [13,14]. Дайын өнімнің сапасына тағамдық талшық пен зығыр ұнының бидай нанының сапасына әсер етуін зерттегенде бақылау үлгімен салыстырғанда өзгерістердің болғандығын алынған зерттеу нәтижелерінен көруге болады.…”

Section: әдебиеттерге шолуunclassified

The formation of the quality of wheat bread from a mixture of vegetable raw materials

Baiysbayeva

Iskakova

Izembayeva

et al. 2023

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This article determines the influence of vegetable additives included in the recipe of wheat bread on the quality of the finished product. The aim of the work is to add flax flour and dietary fiber powder to increase the nutritional value and dietary fiber of wheat bread. In this article with the aim of obtaining bread with good quality characteristics the possibility of using flax seed infusion starter and flax flour in the recipe of wheat bread was studied. To improve the nutritional and biological value of the bread, 0.3-0.7% of dietary fiber and 5-25% of flax flour were added to the mass of wheat flour in the recipe. To determine the optimal amount of additives organoleptic and physico-chemical parameters of the quality of the finished bread were studied. Amino acid composition of the sample selected as the optimal variant, compared with the control sample was determined by the standard method. As a result of laboratory research from the data obtained on the quality indicators of wheat bread with vegetable additives it was determined that the optimal variant of adding 0.5% of dietary fiber powder, 20% of flax flour and sourdough. We can say that the nutritional value of the variant compared to the control in terms of protein content increased by 48.8%. It was found that the finished bread selected as the optimal variant was obtained with high quality characteristics, increased nutritional and biological value, and it can be used for dietary purposes.

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Thermodynamic Calculations of the Process of Reduction of Boricanhydride by Aluminium

Cited by 3 publications

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Optimization of Aluminum Boride Synthesis in the Self-Propagating High-Temperature Synthesis Mode to Create Waste-Free Technology

Optimization of Aluminum Boride Synthesis in the Self-Propagating High-Temperature Synthesis Mode to Create Waste-Free Technology

Kinetics of the Synthesis of Aluminum Boride by the Self-Propagating High-Temperature Synthesis Method

The formation of the quality of wheat bread from a mixture of vegetable raw materials

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