Research On Magnesiaalumina Spinel Synthesized By Used Refractory Materials

With the rapid development of high-temperature industry, the consumption of refractory materials keeps increasing, engendered a large number of used refractory materials. In the current conditions, the recycling use of the used refractory materials is still in the initial stage, so most used refractory materials were abandoned, lead to serious waste of resources and environment pollution.The mass recycling of the used refractory materials is imminent.In order to explore the way of recycling the used refractory materials, this study use used magnesia carbon brick, alumina ash, aluminum titanium slag and aluminum chromium slag as raw material, use X-ray diffractometer, scanning electron microscope and thermal analyzer as main analysis instruments, discusses the influence of the material ratio, temperature, titanium dioxide and chrome oxide on magnesiaalumina spinel synthesis.The experiment results showed that, use magnesium carbon brick and aluminum titanium slag as raw material to synthesis magnesiaalumina spinel, the best mole ratio for magnesia and alumina is 1:1, can get the largest number of magnesiaalumina spinel and the least impurity content. Synthetic magnesium-rich spinel and aluminate-rich spinel obtained many kinds of impurity which in large quantities.Use burned magnesium carbon brick and aluminum ash as raw material to synthesis magnesiaalumina spinel, it is turned out that the minimum reaction activation energy fall to 55.23kJ/mol by adding 6% of titanium dioxide, reaction can occur at low temperature. Reduce or increase the quantity of titanium dioxide, the activation energy increased by a large margin, reaction temperature enhanced.Use burned magnesium carbon brick and aluminum ash as raw material to synthesis magnesiaalumina spinel, then can get minimum reaction activation energy for 464.032kJ/mol by adding 8% of chromic oxide, reaction can occur at low temperature. Reduce or increase the quantity of chromic oxide, the activation energy increased greatly, reaction temperature enhanced.