Preparation of environmental-friendly lime paints from hydrated lime and hydrated light burned dolomite

Hwang, Dae Ju; Yu, Young Hwan; Lee, Seung Kwan; Choi, Moon Kwan; Cho, Kye Hong; Ahn, Ji Whwan; Han, Choon; Lee, Jong Dae

doi:10.1007/s11814-011-0252-9

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…Generally, commercial-purity pure magnesium crowns are manufactured by the Pidgeon process through the thermal reduction of dolomite ore [18]. The purity of these pure magnesium crowns is between 99.5 and 99.7% and they are mainly used for the production of commercial-purity magnesium alloys [19,20]. These commercial-purity In order to identify the origin of particles more clearly, one of those Al-C particles was investigated by EBSD and the analysis results are shown in Figure 6 with an SEM image and IQ map.…”

Section: Carbon Sourcesmentioning

confidence: 99%

“…Generally, commercial-purity pure magnesium crowns are manufactured by the Pidgeon process through the thermal reduction of dolomite ore [18]. The purity of these pure magnesium crowns is between 99.5 and 99.7% and they are mainly used for the production of commercial-purity magnesium alloys [19,20]. These commercial-purity pure magnesium crowns are used in the manufacture of high-purity pure magnesium crowns through additional vacuum distillation [21][22][23].…”

Section: Carbon Sourcesmentioning

confidence: 99%

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Degree of Impurity and Carbon Contents in the Grain Size of Mg-Al Magnesium Alloys

2023

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In this study, the tendency of having different grain structures depending on the impurity levels in AZ91 alloys was investigated. Two types of AZ91 alloys were analyzed: commercial-purity AZ91 and high-purity AZ91. The average grain size of the commercial-purity AZ91 alloy and high-purity AZ91 is 320 µm and 90 µm, respectively. Thermal analysis revealed negligible undercooling in the high-purity AZ91 alloy, while undercooling of 1.3 °C was observed in the commercial-purity AZ91 alloy. A CS analyzer was employed to precisely analyze the carbon composition of both alloys. The carbon content of the high-purity AZ91 alloy was found to be 197 ppm, while the commercial-purity AZ91 alloy contained 104 ppm, indicating a difference of approximately 2 times. The higher carbon content in the high-purity AZ91 alloy is believed to be due to the use of high-purity pure Mg in its production (the carbon content of high-purity pure Mg is 251 ppm). To simulate the vacuum distillation process commonly used in the production of high-purity Mg ingots, experiments were conducted to investigate the reaction of carbon with oxygen to produce CO and CO2. XPS analysis and simulation results for activities confirmed the formation of CO and CO2 during the vacuum distillation process. It could be speculated that the carbon sources in the high-purity Mg ingot provide Al-C particles, which act as nucleants for Mg grains in the high-purity AZ91 alloy. Thus, it can be considered the main reason that high-purity AZ91 alloys have a finer grain structure than that of commercial-purity AZ91 alloys.

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Section: Carbon Sourcesmentioning

confidence: 99%

“…Generally, commercial-purity pure magnesium crowns are manufactured by the Pidgeon process through the thermal reduction of dolomite ore [18]. The purity of these pure magnesium crowns is between 99.5 and 99.7% and they are mainly used for the production of commercial-purity magnesium alloys [19,20]. These commercial-purity pure magnesium crowns are used in the manufacture of high-purity pure magnesium crowns through additional vacuum distillation [21][22][23].…”

Section: Carbon Sourcesmentioning

confidence: 99%

Degree of Impurity and Carbon Contents in the Grain Size of Mg-Al Magnesium Alloys

2023

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Effect of Calcination Temperature on the Hydroxyl Radical Generation of Calcined Dolomite Suspension

Hoshiba

Ponou

Dodbiba

et al. 2018

Journal of the Mining and Materials Processing Institute of Jap

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Recently, calcined dolomite has been used as an anti-bacterial material in various applications for improving public health. Generally speaking, calcined dolomite exhibits anti-bacterial effects due to its strong alkalinity after hydration. There are authors who have reported that the calcined dolomite can generate Reactive Oxygen Species (ROS), although there are other authors who were not able to detect it. Since the anti-bacterial mechanism of the calcined dolomite is not yet very clear, it was subject to ESR (Electron Spin Resonance) spin trapping method in order to confi rm the generation of the hydroxyl radical. In this work, the hydroxyl radical was detected from calcined dolomite-hydrogen peroxide (H 2 O 2) suspension. It was found that dolomite, calcined at the relatively higher temperature between 800 ℃ and 1000℃ , enables faster H 2 O 2 decomposition. The results of this work indicate that calcined dolomite suspension generates hydroxyl radicals in the presence of H 2 O 2 .

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Preparation of environmental-friendly lime paints from hydrated lime and hydrated light burned dolomite

Cited by 2 publications

References 17 publications

Degree of Impurity and Carbon Contents in the Grain Size of Mg-Al Magnesium Alloys

Degree of Impurity and Carbon Contents in the Grain Size of Mg-Al Magnesium Alloys

Effect of Calcination Temperature on the Hydroxyl Radical Generation of Calcined Dolomite Suspension

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