For the purpose of broadening the scope of applications of nickel slag, this paper focuses on the crystallization properties of glass ceramics with large amounts of iron-rich nickel slag. In this research, the properties including activation energy of crystallization, crystalline growth pattern, main crystalline phase and micro structure were discussed. It was shown that when KNO 3 was added, the Fe 2+ oxidized to Fe 3+ , the activation energy of crystallization increased from 283.70 kJ/mol to 345.45 kJ/mol and the Avrami changed from 2.40 to 2.35. The main crystalline phase for both samples was pyroxene and it grew in one-dimension.

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