Method for improving smelting quality of casting refractory material

Abstract

The invention discloses a method for improving the smelting quality of a casting refractory material. The method comprises the following steps: mixing a high-melting-point refractory raw material for producing the casting refractory material, an auxiliary material and a fluxing agent to prepare a batch, and adding the batch into an electric arc furnace; a through hole penetrating through the furnace shell and the fire-resistant furnace lining is formed in the side wall of the electric arc furnace; a ventilation spray gun is arranged in the through hole, and the ventilation spray gun is made of a high-temperature-resistant ceramic material embedded with a high-temperature alloy air channel in an isostatic pressing forming mode or is made of a steel pipe additionally provided with a cooling water circulation pipeline; a flow limiting device is arranged on the ventilation spray gun and used for controlling the spraying speed of oxygen or nitrogen; and in the melting period when the batch is melted to generate melt, the flow limiting device is started to spray oxygen or nitrogen into a molten pool in the electric arc furnace through the ventilation spray gun without interrupting the melting operation. The stirring strength and uniformity of the melt can be improved, and the smelting rhythm is accelerated, so that the density and quality of a product are improved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the category of refractory materials, and relates to a high-temperature melting production technology of fused and cast refractory materials, in particular to a method for improving the smelting quality of fused and cast refractory materials. Background technique [0002] Casting refractory is to mix high melting point refractory raw materials with auxiliary raw materials and fluxes, prepare batches and melt them at high temperature in an electric arc furnace, then pour the high temperature melt into sand molds, control the cooling and annealing of castings, and produce casted refractory bricks. It is prepared by cold working such as cutting and drilling. Because its smelting equipment electric arc furnace is a direct heating electric arc furnace, the electric arc is generated between the special electrode and the smelted batch material, that is, the smelting electric arc furnace for casting refractory materials is an arc gener...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of low smelting quality of existing fused and cast refractories, weak stirring intensity, wasted capacity of electric arc furnaces, and inconvenient replacement of gas sources, the purpose of the present invention is to provide a method for improving the smelting quality of fused and cast refractories, while increasing the melting efficiency of electric arc furnaces. Double the increase to avoid waste of electric arc furnace capacity and reduce power consumption

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