Application of Refractories for Alumina Circulating Fluidized Roasting Furnace

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Application of Refractory Materials to Recycle of Alumina Boiling Roasting Furnace Alumina refers to the aluminium oxide, which is a reconstituted material blended with bauxite ore and developed as a substitute to natural, pure alumina in the smelting and refractory industry. Alumina is widely us......

Application of Refractory Materials to Recycle of Alumina Boiling Roasting Furnace

Alumina refers to the aluminium oxide, which is a reconstituted material blended with bauxite ore and developed as a substitute to natural, pure alumina in the smelting and refractory industry. Alumina is widely used in the industrial world, including its application to the recycling of alumina boiling roasting furnace.

Boiling roasting furnace is an important component of the alumina recycling process. The demand for the efficient alumina recycling process continues to rise due to the expanding applications of alumina in various industries. The optimized design and proper refractory materials of the boiling roasting furnace are essential for the efficient and reliable alumina recycling process.

Alloying, melting, and casting are the three basic steps in the alumina recycling process. The first step begins with the sorting and preparation of alumina for melting and subsequently alloying. The molten alloy is then poured into pre-defined molds in the second step for casting. In the third step, the cast parts are heated in the boiling roasting furnace for refining and solutioning.

Refractory materials are used in the interior and exterior furnaces of a boiling roasting furnace. For the interior furnace, the materials must possess the appropriate thermal and oxidative resistance for the efficient heating of the alumina particles and must be capable of withstanding the furnace cycles during the solutioning process. Inside the furnace, the thermal insulation must resist the temperatures quickly reaching above 1600 ºC, while simultaneously controlling oxidation and preventing molten aluminum from spilling and burning inside the furnace.

On the other hand, the refractory materials of the external furnace must possess excellent electrical and mechanical properties to ensure a safe, efficient and reliable alumina recycling process. In the external furnace, the refractory materials must be electrically insulating and wear resistant, while simultaneously protecting the furnace from corrosion and other environmental factors.

Various refractory materials have been used for the alumina recycling furnace. These include silica and silica-containing binders, alumina-containing mortars, silica-based castables and bricks, alumina-silica composites and zirconia-mullite composites. Each of these materials possesses its own advantages and drawbacks which must be taken into consideration when selecting the best material for a particular application.

Silica and silica-containing binders are commonly used as mortar materials to cast the interior of the aluminumroasting furnace. These binders have high thermal shock resistance and are also capable of withstanding the drippings generated during the furnace cycles. The silica binder also exhibits excellent electrical resistance, which is an essential quality for an efficient alumina recycling process.

Alumina-containing compounds are also used for the interior of the alumina-recycling boiling roasting furnace due to its ability to resist thermal shock and oxidation. These compounds also show a high resistance to slag, another essential characteristic for a reliable alumina recycling process. On the exterior walls of the furnace, ceramic fiber blankets, castables and bricks are mainly used as insulation and protection against air and moisture infiltration.

Zirconia-mullite composites are commonly used for the refractory lining of external furnace. These materials have high thermal shock resistance and can be used for a longer duration compared to other materials. In addition, these composites have excellent thermal insulation properties, which makes it the ideal material for the alumina recycling process.

In conclusion, the refractory materials used in the alumina-recycling boiling roasting furnace must possess excellent thermal, electrical, mechanical and thermal insulation properties in order to ensure a safe, reliable and efficient alumina recycling process. Silica and silica-containing binders, alumina-containing compounds and zirconia-mullite composites are among the materials specifically designed for the efficient and reliable alumina recycling process. With a careful selection of the appropriate refractory materials and an optimized design, the applications of alumina to the alumina-recycling process will continue to expand.

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