Refractory material for circulation system of RH furnace and method for preparing same

Abstract

The invention relates to the technical field of refractory materials, in particular to a refractory material for a circulation system of an RH furnace and a method for preparing the same. The material comprises the following raw materials by weight percentage: 80 to 90 percent of magnesia, 5 to 10 percent of graphite, 2 to 6 percent of mixture comprising at least two of Ai, Si, SiC and B4C, and 3 to 4 percent of phenolic resin. The preparation method comprises the following steps of: (1) weighing up the raw materials; (2) mixing the raw materials; (3) forming a green body by a press; (4) drying the green body by a resistance furnace; and (5) mechanically processing the green body by a lathe. Compared with the prior art, by using the material, the capability of resisting the corrosion of the molten steel is improved, and the organizational structure of the product is also improved; by using the high-pressure forming method, particularly the isostatic pressing forming, the structure of the product is uniform and dense, brick work joints are reduced, the structural stability is improved, and simultaneously the assembly procedure is simplified; because the material is not fired at a high temperature, the energy consumption is lowered, the cost is saved, and the production period is shortened; and the quality and the service life of the product are improved, and because the material is chromium-free, the environmental pollution is reduced.

Description

[technical field] [0001] The invention relates to the technical field of refractory materials, in particular to a refractory material for a RH furnace circulation system and a preparation method thereof. [Background technique] [0002] The RH furnace is the refining equipment outside the furnace in the iron and steel smelting process. The inner lining is made of refractory materials. The circulation system is located at the bottom of the furnace, including the circulation pipe and the dipping pipe, which are the channels for the molten steel ring. The vacuum degassing is mainly realized through the circulation of molten steel. molten steel refining. Therefore, the refractories used in the RH furnace circulation system must withstand the erosion and erosion of molten steel and slag, as well as the cold and heat changes caused by intermittent operations. [0003] The existing refractory materials for the circulation system of the RH furnace are mainly made of magnesia-chrome ...

AI Technical Summary

Problems solved by technology

[0003] The existing refractory materials for the circulation system of the RH furnace are mainly made of magnesia-chrome materials, with magnesia, chrome ore, and synthetic magnesia-chrome as the main raw materials, which are mixed-dried-fired-processed-assembled. The process route of this material is Long, high energy consumption, high cost, it is difficult to prepare large bricks; in terms of structure and performance, the main reason is that the poor thermal stability leads to structural peeling and affects the service life; and there are more or less public hazards caused by high-priced chromium