Box type heat preservation annealing method for fused zircon corundum brick

Abstract

The invention relates to a box type heat preservation annealing method for a fused zircon corundum brick, and belongs to the technical field of refractory materials. The method comprises the following steps of: placing a casting mold in a heat preservation box before casting; filling the bottom and the surrounding part of the heat preservation box with aluminum silicon hollow balls; and directly and continuously covering the aluminum silicon hollow balls on the top of the casting mold to perform heat preservation annealing after the casting. The method has the advantages of guaranteeing product quality and improving product yield, along with low labor intensity, good working environment and uniform heat preservation and is easy and convenient to operate.

Description

Technical field [0001] The invention relates to a box-type thermal insulation annealing method for fused zirconia corundum bricks, which belongs to the technical field of refractory materials. Background technique [0002] For a long time, two methods are generally used for annealing and cooling of fused zirconia corundum bricks, one is annealing kiln and the other is box-type thermal insulation annealing; the former generally uses oil-fired or electric heating, and the kiln is generally longer and consumes more fuel. The process is complex, the annealing method is fixed and inflexible, and it is not suitable for thermal insulation annealing of super-large special-shaped products; while the latter box thermal insulation annealing method has simple process, flexible operation, strong adaptability to product shape and energy saving, but it uses traditional thermal insulation materials Diatomaceous earth or vermiculite is used on the top, and there are the following defects in the p...

AI Technical Summary

Problems solved by technology

[0002] For a long time, the annealing and cooling of fused zirconia corundum bricks has generally adopted two methods, one is an annealing kiln, and the other is a box-type heat preservation annealing; the former generally adopts a fuel oil type or an electric heating type, and the kiln body is generally long and consumes a lot of fuel. The process is complicated, and the annealing method is fixed and inflexible, so it is not suitable for heat preservation and annealing of extra-large and special-shaped products; although the latter kind of box-type heat preservation annealing method is simple in process, flexible in operation, strong in adaptability to product shape and energy-saving, it is not suitable for heat preservation and annealing when using traditional heat preservation materials. Diatomaceous earth or vermiculite is used above, and there are the following defects in the process:

[0003] (1) Because the insulation material is powdery and light in weight, it will scatter a lot during the process of putting it into the insulation box, causing serious dust and pollution;

[0004] (2) Because it is a natural material, the quality is unstable, and the product has a long heat preservation time, resulting in many product cracks and low yield;

[0005] (3) Due to the small specific gravity and poor supporting force of powdered insulation materials, it is necessary to pre-fill materials with large specific gravity (such as silica sand) during the electric furnace casting stage. After the casting is completed, the product is lifted out of the mold at high temperature and transferred into an incubator filled with diatomaceous earth or vermiculite (called "hot bricks"), which makes the operation process complicated and the working environment extremely harsh