Abstract
Potassium hexatitanate (K2Ti6O13) whiskers with excellent dispersity were synthesized from titanium-bearing electric arc furnace molten slag (Ti-bearing EAF slag) by calcination method in this paper. The effects of TiO2 to KOH molar ratios (RTiO2KOH), calcination temperature and duration on the micromorphology and crystallinity of as-prepared K2Ti6O13 whiskers were systematically investigated. The results indicated that well disperse and relatively pure K2Ti6O13 whiskers were synthesized when the calcination temperature was 900°C and calcination time was 300min with RTiO2KOH value at 1.75. The diameter of prepared whiskers was larger with the increase of calcination temperature from 850 to 1100°C and time from 10 to 300min. At the same time, the morphology of prepared K2Ti6O13 whiskers transformed from fibrous structure to rod-like structure. In addition, the thermal stability of K2Ti6O13 whiskers was also discussed under optimum conditions by using TG-DSC analysis. It is shown that the product exhibited excellent thermal stability and K2Ti6O13 whiskers would not decompose up to about 1430°C.
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