Термическое обогащение никеля из лимонита методом селективного восстановления

Для изучения минералогического состава и параметров лимонитовых руд из Индонезии применялись методы рентгеновской дифракции (XRD), рентгеновской флуоресценции (XRF), энергодисперсионного микроанализа на растровом электронном микро­ско­пе (SEM–EDS) и дифференциального термического анализа (DTA). Полученные данные указывают на наличие сложного внутреннего ядра в латеритной руде. Содержание Ni, Fe, Mg, Al и Si в лимоните составляет 1,4; 50,5; 1,81; 4,86 и 16,5 % (вес.) соответственно, оксидов/гид­роксидов железа – 94,4 %, силикатов – 5,6 %. Термический анализ показывает, что при низкой температуре (200 – 300 °C) в лимоните происходит фазовый переход, при этом гетит замещается гематитом. Эта фаза является оптимальным вариантом для диффузии никеля в железо. Более того, для данного лимонита в качестве подходящего метода было выбрано термическое обогащение.

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