Crystallization Properties of the Glass Ceramics Prepared from Iron-Rich Nickel Slag

Abstract

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.

Preparation of foamed ceramics from steel slag with high calcium and iron content

“…The reason is that with the increase of steel slag content, the content of Mg 2+ increases, and diopside will continue to increase. In the CaO‐MgO‐SiO 2 phase diagram, when the content of Al 2 O 3 is higher than 15%, the main crystal phase of ceramics is related to the content of MgO, and diopside increases with the increase of the content of MgO 20 . At the same time, part of anorthite is transformed, decomposed into calcium chelmark molecules, and then solid‐dissolved into diopside, 21,22 which reduces production of anorthite.…”

“…In the CaO-MgO-SiO 2 phase diagram, when the content of Al 2 O 3 is higher than 15%, the main crystal phase of ceramics is related to the content of MgO, and diopside increases with the increase of the content of MgO. 20 At the same time, part of anorthite is transformed, decomposed into calcium chelmark molecules, and then solid-dissolved into diopside, 21,22 which reduces production of anorthite. In addition, due to the ionic radius of Fe 2+ , Fe 3+ and Mg 2+ are similar, isomorphism is easy to occur in pyroxene, 19 with steel slag content increases, Fe 2+ , Fe 3+ begin to dissolve into diopside, and diopside ferrian, syn appears.…”