Abstract
Devitrification behavior of vitrified industrial waste (electric arc furnace dust and foundry sand) was examined by differential thermal analysis (DTA), X‐ray diffractometry, and scanning electron microscopy (SEM). Crystalline phases identified were primarily solid solutions of spinel and augite. The temperature of maximum nucleation rate for spinel was determined by DTA to be 635°C. Variations in the quench temperature resulted in changes of both grain size and volume fraction of an equixed spinel. The evolution of morphological changes upon heat treatment was examined by SEM. TiO2 additions were ineffective as spinel nucleating agents, because additions of >5 wt% resulted in decreased spinel formation and the crystallization of titanium‐iron and titanium‐divalent‐metal oxides. Controlling process and heat‐treatment temperatures to optimize the amount of the spinel and to achieve a high‐grade abrasive product also are discussed.
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