Synthetic hercynite and production method thereof

Abstract

The invention provides synthetic hercynite and a production method thereof. The synthetic hercynite can be sintered by using a tunnel at a large scale. The synthetic hercynite comprises the following chemical components: industrial aluminum oxide, iron oxide red, magnesium aluminate spinel, a high-carbon material, an additional binder and an out-spayed antioxidant coating. The production method of the synthetic hercynite comprises the following steps: burdening, premixing, mixing, molding, thermal treatment, spraying a billet surface, sintering and synthesizing, and inspecting. The characteristics that the Fe2<+> and Mg2<+> ions are similar in radius, the magnesium aluminate spinel and the hercynite have the same crystal structures are utilized, so as to generate solid solutions of two spinels, and stabilization of the hercynite is utilized. The obtained hercynite is high in purity, large in crystal size, and good in stability. Meanwhile, the dead space of a tunnel kiln is utilized, an energy source is saved, the production technology is simplified, the cost is reduced, and large-scale production can be achieved.

Description

technical field [0001] The invention relates to the field of refractory material industry, in particular to a synthetic iron-aluminum spinel and a production method thereof. Background technique [0002] Magnesia-chrome bricks are widely used in the firing zone of cement rotary kilns because of their good high-temperature performance and superior kiln skin hanging performance. However, with the advancement of calcined cement technology, the early traditional magnesia-chrome bricks combined with silicate can no longer meet the requirements of modern new dry-process cement kiln production technology. The main feature of directly bonded magnesia-chrome bricks is the direct combination between periclase and periclase grains, periclase grains and chrome-iron spinel grains in the brick, resulting in its resistance to cement clinker erosion and high temperature The strength is significantly better than traditional magnesia-chrome bricks. Directly bonded magnesia-chrome bricks are...

AI Technical Summary

Problems solved by technology

This method utilizes the reduction effect of metal aluminum on iron oxide. Although it is no longer necessary to control the weak reducing atmosphere, pure iron-aluminum spinel can be sintered and synthesized as long as it is under vacuum conditions. However, the volume of the general vacuum furnace is small and the cost is high. Not suitable for widespread use

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