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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
SEM-EDS analyses of the mixtures with an acidity of 0.92 smelted at 1450 °C for 60 min in pure N2 (99.99%) atmosphere. (a) Water quenching; (b) Air cooling.