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Comparative analysis of bricks manufactured in the New World (1494–1544)
Published in João Mascarenhas-Mateus, Ana Paula Pires, Manuel Marques Caiado, Ivo Veiga, History of Construction Cultures, 2021
E. Prieto-Vicioso, V. Flores-Sasso
In M1 quartz corresponds to the high proportion of silica released by XRF. The microcline is a potassium feldspar. This mineral, along with albite, contains the aluminum present in the results. Hematite and goethite contain the iron.
Assessment of Amagunze microcline for alumina recovery in nitric acid and hydrogen peroxide solutions and kinetic study
Published in Canadian Metallurgical Quarterly, 2023
Ikechukwu A. Nnanwube, Okechukwu D. Onukwuli, Ekuma O. Ekumankama
In the near future, a commercial process which utilises a low-grade aluminium ore will be needed for aluminium production [9]. Comprehensive utilisation of the secondary resources helps assuage the shortage of primary resource and improve the environmental condition [10]. Clay minerals with high alumina content have been widely adopted as a readily available alternative in most countries for the production of alumina. Chemically, clays are hydrous aluminium silicates, typically containing slight amounts of impurities such as potassium, sodium, calcium, magnesium, or iron. Microcline (KAlSi3O8), with the chemical compound name, potassium aluminium silicate, is an important igneous rock-forming tectosilicate mineral. It is commonly found in granite and pegmatite. It forms during slow cooling of orthoclase; however, it exhibits more stability than orthoclase at a lower temperature. With over 25% alumina content, microcline proves to be a viable option for the production of alumina [11].
Manufactured Feldspar-quartz Sand for Glass Industry from Gneiss Quarry Rock Fines Using Dry Rare-earth Magnetic Separation
Published in Mineral Processing and Extractive Metallurgy Review, 2019
Luanna C. Moura, Flávio P. André, Hayla Miceli, Reiner Neumann, Luis Marcelo Tavares
Micrographs from thin sections show an inequigranular texture. Figure 4(a) shows elongated feldspar crystals and oriented small lamellar biotite. The size of biotite can help understanding the need for crushing below 300 µm to fully liberate it. Biotite grains also appear as inclusions in plagioclase and microcline. The dominant alkali feldspar is microcline, identified by its tartan twinning.