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What is calcination?

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Calcination is a process that involves heating a material to a high temperature in order to bring about various changes in its properties. It is commonly used in different fields such as materials science, chemistry, and geology. In materials science, calcination is often used to remove organic components from materials and to condense silanol groups, which affects the textural and physical properties of the material . In chemistry, calcination is used to alter the adsorption characteristics of clay minerals, such as increasing their adsorption capacity for mycotoxins . In geology, calcination is used to stabilize the interlayer structure of clay minerals, reducing their expansive ability and cracking properties . Overall, calcination is a versatile process that can be tailored to achieve specific changes in a material's properties depending on the desired outcome.

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Open access•Journal Article•DOI Calcination-Enhanced Laser-Induced Damage Threshold of 3D Micro-Optics Made with Laser Multi-Photon Lithography Darius Gailevičius, Rokas Žvirblis, Karolis Galvanauskas, Gintarė Batavičiūtė, Mangirdas Malinauskas - Show less +4 more 21 May 2023-Photonics	Calcination is a heat-based post-processing method used to convert hybrid prepolymers into inorganic composite glass or glass-ceramic structures while retaining the printed geometry.
Open access•Journal Article•DOI Calcination Enhances the Aflatoxin and Zearalenone Binding Efficiency of a Tunisian Clay. Roua Rejeb, Roua Rejeb, Gunther Antonissen, Marthe De Boevre, Christel Detavernier, Mario Van de Velde, Sarah De Saeger, Richard Ducatelle, Madiha Hadj Ayed, Achraf Ghorbal - Show less +9 more 16 Oct 2019-Toxins 11 Citations	Calcination is a heat treatment process that alters the adsorption characteristics of clay minerals, as mentioned in the paper.
Open access•Journal Article•DOI Intercalation and calcination as methods to reduce expansive soil properties Ristiya Adi Wiratama, Eko Hanudin, Benito Heru Purwanto - Show less +2 more 30 Jun 2021-Sains Tanah: Journal of Soil Science and Agroclimatology	Calcination is a high-temperature treatment process used in this study to heat the clay samples at temperatures of 200°C and 300°C in a muffle furnace.

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What is the effect of calcination on kaolinite clay?5 answersCalcination of kaolinite clay has various effects on its properties. The presence of calcite impurities in the clay leads to the formation of a granular deposit during calcination, which reduces the specific surface area of the clay. The decomposition of calcite also affects the reactivity of the clay, with higher calcite content resulting in a negative impact on reactivity. On the other hand, calcination conditions such as heating rate, time, and temperature have a significant influence on the compressive strength of geopolymer made from metakaolin, a calcined form of kaolinite. The calcination process reduces the crystallinity of raw kaolin, resulting in metakaolin with improved physicochemical characteristics closer to that of ideal kaolin. Overall, calcination plays a crucial role in modifying the structure and properties of kaolinite clay, affecting its reactivity, specific surface area, and suitability for various applications.

What is the definition of calcination?4 answersCalcination is a process that involves heating a substance to high temperatures in order to bring about a chemical or physical change. It is commonly used in various industries such as chemical production and ore processing. The purpose of calcination can vary depending on the specific application. For example, in the context of metallosilicate catalysts, calcination is performed at different temperatures and stages to activate the catalyst and enhance its performance. In the case of a calcination device for chemical production, the process is used to automatically calcine chemical raw materials, resulting in labor and time savings, as well as improved production efficiency. Another example is the calcination method for protecting the mesoporous structure of natural ore, where calcination is carried out in a protective atmosphere to improve the purity and whiteness of the product while preventing the collapse of mesoporous channels.

What is the purpose of the calcination process?5 answersThe purpose of the calcination process is to convert certain materials into a different form by subjecting them to high temperatures. Calcination involves heating a substance to a specific temperature in order to bring about chemical or physical changes. In the case of the papers provided, the calcination process is used for various purposes. In one paper, it is used to prepare mixed metal oxide catalysts with a specific amorphous content. Another paper focuses on the calcination of seashell waste to convert calcium carbonate into calcium oxide. A third paper discusses the calcination process for producing a catalyst for the oxidative conversion of ethylene to ethylene oxide. Additionally, calcination is used in the cement industry to decompose calcium carbonate into calcium oxide and carbon dioxide. Finally, a mathematical model of the calcination process is studied in relation to fuel consumption in metallurgical furnaces.

What is the effect of calcination on the structure of SiO2 and Al2O3?5 answersCalcination has different effects on the structure of SiO2 and Al2O3. For SiO2, calcination at temperatures above 1000 °C leads to the appearance of the mullite phase and an increase in crystallization activation energy. On the other hand, for Al2O3, the addition of Al2O3 content in CaO-SiO2-based mold flux melts initially reduces complex structural units but then increases them with further addition. The specific surface area and pore size of silica/alumina xerogels reach their maximum at 500-700°C, after which the samples become sintered and lose mesoporosity. In the case of SiO2 and Al2O3 composite materials, calcination temperature affects the structure and properties. Calcination at 300 °C leads to aggregation and incomplete formation of the crystalline phase, while calcination at 500 °C results in good particle separation and a well-dispersed single anatase phase.

Why does CaCO3 form a crust after being calcined?3 answersCaCO3 forms a crust after being calcined due to the decomposition of CaCO3 and the subsequent formation of pores in the material. During the decomposition process, CO2 is released from the CaCO3 lattice, leaving behind vacancies within the solid. These vacancies diffuse and collide, leading to the formation of pores. The evolution of the pore structure during calcination results in a characteristic bimodal distribution of pore sizes in the calcined CaCO3, with average pore sizes of approximately 2.8 nm and 50 nm. The formation of these pores contributes to the crust-like structure observed in calcined CaCO3.

What is the point of calcinated calcium chloride?3 answersCalcinated calcium chloride is used for various purposes in different industries. It is commonly used as an accelerator in concrete mixtures, reducing the initial and final setting times of concrete. In the oil industry, calcium chloride has been found to enhance the anti-corrosion properties of seawater well-killing fluid. Additionally, calcium chloride can be used in the stabilization of unpaved road surfaces, reducing road blading, aggregate loss, and surface erosion. Furthermore, calcium chloride is used in the production of an inexpensive brine that has little corrosive action on metals, such as aluminum, and poses no health hazards. However, it is important to note that calcium chloride can also cause serious corrosion problems in reinforced concrete structures.

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