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Minerals
Published in Dexter Perkins, Kevin R. Henke, Adam C. Simon, Lance D. Yarbrough, Earth Materials, 2019
Dexter Perkins, Kevin R. Henke, Adam C. Simon, Lance D. Yarbrough
Depending on the composition, we give plagioclase a variety name: albite, oligoclase, andesine, labradorite, bytownite, or anorthite (Fig. 3.20). Adding some confusion, the name albite is used in two ways. It refers to both the end-member composition (NaAlSi3O8) and to any plagioclase that contains 90%–100% NaAlSi3O8. Similarly, the name anorthite refers to the end-member composition CaAl2Si2O8 and to plagioclase that contains 90%–100% CaAl2Si2O8.
Defects, diffusion and dopants in the ceramic mineral “Lime- Feldspar”
Published in Journal of Asian Ceramic Societies, 2021
Sivanujan Suthaharan, Poobalasuntharam Iyngaran, Navaratnarajah Kuganathan, Alexander Chroneos
Anorthite (CaAl2Si2O8), also termed lime-feldspar, is a naturally occurring rock-forming mineral found in many countries including Italy, Japan, USA, India and Srilanka [1–3]. It is a potential ceramic material in the industrial preparation of heat exchangers, feldspar glasses, electronic substrates and materials required for biomedicine [4–7]. As its crystalline phase, it can improve the translucent property of bone china, there is an increasing attention to prepare anorthite-based porcelain to make tableware with high heat stability [8]. Furthermore, calcium-bearing minerals are of interest in the development of electrode materials for rechargeable Ca-ion batteries [9]. Though CaAl2Si2O8 was not studied for this purpose yet, theoretical investigation on other Ca-based minerals is available [10–12].
Study on the working mechanism of fluid loss additive for chlorination titanium blast furnace slag
Published in Journal of Dispersion Science and Technology, 2023
Ping Zhou, Yuanpeng Wu, Huiting Liu, Ming Li, Weiyuan Xiao, Meng Liu, Jianzhang Hao, Yanming Li, Chengxin Li
Table 4 shows the phase composition of chlorination titanium blast furnace slag, and Figure S4 (Supporting Information document) shows the measurement and analysis diagram of MLA. From Table 5 and Figure S4, it can be seen that more than 60% of the chlorination titanium blast furnace slag in MLA analysis is anorthite, nearly 20% is calcium silicate, and about 12% is titanite. Anorthite is a mineral of the feldspar group, which belongs to plagioclase and is a calcium aluminum silicate mineral. It is white or gray glassy crystals, which is relatively brittle. Anorthite can be used as a raw material for ceramics and glass products. Calcium silicate has potential hydration and hardening activity.
Sustainable ceramics derived from solid wastes: a review
Published in Journal of Asian Ceramic Societies, 2020
In recent years, few works have been found to introduce the wastes in the composition of insulation refractories. A comprehensive study for the wastes containing insulation refractories with various parameters is listed in Table 2. It has been observed that the addition of wastes in the insulation refractory compositions can improve their insulation behavior, porosity, and strength up to a limit. Ramezani et al. (2018) [26] have studied the effect of waste serpentine (mining waste) on the insulating behavior of basic insulation refractories. The refractories are synthesized using the waste serpentine (after calcined at 1550°C) along with dead-burned magnesia, expanded perlite, and calcined alumina as starting raw materials and fired at 1250, 1350 and 1450°C. The calcined serpentine incorporation is improved the thermo-mechanical properties of the refractories. 43 wt.% dead-burned magnesia, 20 wt.% calcined alumina, 17 wt.% expanded perlite and 20 wt.% calcined waste serpentine containing specimen shows the lowest σ due to high insulating forsterite phase in the system. Hassan et al. (2019) [27] have studied the pore formation ability of waste bagasse (residue from sugar cane processing) in the fireclay insulating bricks. Bricks are prepared by the addition of bagasse (0 to 5 wt.%), polystyrene (1 to 2 wt.%), kaolin and fired at 1250°C. The bagasse is found a good replacement of conventionally expensive petrochemical additives (polypropylene, polyethylene, and polystyrene), which are generally used as a pore creator in the insulation bricks. Sutcu et al. (2012) [28] have fabricated anorthite (CaO·Al2O3·2SiO2) based insulating refractories using waste paper-processing sludge (30 wt.%) as a calcium oxide source and sawdust (0 to 30 wt.%) as a pore former. The samples are prepared through the slurry casting route and fired at 1200 and 1300°C. The porous and lightweight anorthite is formed at 1200°C by the reaction of calcium oxide (from sludge) and aluminum silicate (from clays). Sawdust incorporation into the composition has hugely influenced the porosity and pore size in the anorthite matrix, as displayed in Figure 1. The size of the pores is significantly increased with the addition of sawdust from 0 to 30 wt.% through the burning of organic matters. The porosity is increased from 57 to 74%, and σ is decreased from 0.25 to 0.13 (W/m·K) at room temperature. Mandal et al. (2017) [29] have synthesized insulation bricks by utilizing the aluminum plant wastes (FA and red mud) along with sawdust. FA (0 to 100 wt.%), red mud (100 to 0 wt.%) and sawdust (0 to 10 wt.%) are mixed with an adequate amount of water and pressed with a uniaxial pressure of 15 MPa. The bricks are fired at 1000, 1100 and 1200°C. 60:40 weight ratios of FA and red mud along with 7.5 wt% sawdust containing fired bricks (1100°C) meets the required properties as per standard IS: 2042 for Type-A insulation bricks.