Study of the High-temperature Synthesis of MgAl_2O_4 Spinel Refractory Raw Materials from Chromium Slag

摘要

To make use of chromium slag waste, this study examined the technology of the preparation of MgAl_(2)O_(4) spinel refractory raw material by using chromium slag. The results showed that (1) using the traditional sintering process of synthetic spinel, the highest volume density was 3.14 g/cm~(3) and the lowest porosity rate was 9.16 %. With the increase of the proportion of MgO powder mixing, bulk density and porosity fluctuations, and which cannot meet the requirements of refractory raw materials. (2) For MgAl_(2)O_(4) spinel prepared by the electric-melting process, the highest volume density was 3.27 g/cm~(3) and the lowest porosity rate was 8.78 %. Volume density and the porosity remained stable, and they are affected by MgO powder thus the blending ratio is very small, which can satisfy the requirements of refractory raw materials. (3) MgAl_(2)O_(4) spinel prepared by the electric-melting method is superior to traditional MgAl_(2)O_(4) spinel in terms of slag resistance and thermal shock resistance.