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- W3014838778 abstract "The use of lithium ion batteries has significantly increased over the last few years due to the growing share of electrical cars, and is expected to increase even further in the future. Recycling of these batteries is essential to safely dispose hazardous materials as well as to recover valuable metals (Cu, Ni, Co, etc.). The focus of the present study is the pyrometallurgical recycling method developed by Umicore. In order to optimise the pyrometallurgical process, accurate information is required on the slag phase equilibria for battery smelting. The slag is a multi-component system containing alumina from the battery cases, silica and lime from fluxes, and manganese and lithium from the electrode materials. When studying the quaternary system AlO-CaO-“MnO”-SiO, differences in phase assemblage were identified between previous studies and experimental results in the AlO-CaO-SiO sub-ternary system. The present study accurately determines the phase equilibria in the AlO-CaOSiO sub-ternary system in argon. The experimental procedures involve equilibration of high purity powder mixtures at high temperatures, rapid quenching, and accurate measurement of phase compositions using electron probe X-ray microanalysis. The liquidus surface is determined at temperatures between 1503 K and 1873 K in the anorthite (CaAlSiO), gehlenite (CaAlSiO), pseudowollastonite (CaSiO), corundum (AlO), CaAlO, CaAlO, CaSiO and CaSiO primary phase fields resulting in a more accurate phase diagram. Based on the present study, further measurements are undertaken in the quaternary “MnO”-AlO-CaO-SiO system at low “MnO” concentrations, which closely represents the future recycling industrial slags. Accurate measurements of the phase equilibria in the ternary sub system AlO-CaO-SiO will provide important information on the pseudo-ternary as well as enable development of more accurate chemical thermodynamic databases to describe the complex future industrial slags." @default.
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- W3014838778 date "2015-01-01" @default.
- W3014838778 modified "2023-09-23" @default.
- W3014838778 title "Phase chemistry study of the Al2O3-CaO-SiO2 system to support lithium ion battery recycling" @default.
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