Low density fire resistant pouring material for KR stirring paddle

Abstract

The invention provides a KR stirring paddle desulfuration used low density fireproof casting material, which belongs to the field of a fireproof material used for pretreatment of ladle desulfuration and desilication before pneumatic steelmaking. The volume density of the fireproof casting material is 2.3 to 2.7g / cm<3>; the granule is primarily prepared with superfine flint clay, silica and carborundum. The casting material further comprises alumina powder, carborundum, silica micropowder and alundum cement of less than 0.074mm. The components and the mass percentages of the KR stirring paddledesulfuration used low density fireproof casting material are as follows: 60 to 80 percent of aggregate; 20 to 40 percent of fine powder; an additive of 0.03 to 0.35 percent of the total weight of the aggregate and the fine powder; a detonation inhibitor of 0.02 to 0.5 percent of the total weight of the aggregate and the fine powder; and stainless steel fiber of 0 to 7 percent of the total weightof the aggregate and the fine powder. After the raw materials are mixed, water is added, the mixture is beaten, cast and moulded. After the moulded mixture is cured, and molded mixture is baked at moderate temperature, thus getting the KR stirring paddle desulfuration used low-density fireproof casting material. The KR stirring paddle desulfuration used low density fireproof casting material has the advantages of low cost, high wear resistance at high temperature, high service life and so on.

Description

Technical field [0001] The invention relates to a low-density refractory castable for a KR stirring paddle, which belongs to the field of refractory materials for pretreatment of molten iron desulfurization and desiliconization by using a KR stirring paddle in a molten iron ladle before steelmaking in a converter. Background technique [0002] So far, the pretreatment of molten iron before the converter steelmaking mainly adopts two methods: desulfurization spray gun and KR stirring paddle for desulfurization and desiliconization. The spray gun desulfurization and desiliconization are mainly carried out in torpedo tanks. The principle is to use the carrier to spray the desulfurizing agent into the molten iron through the spray gun at high pressure to perform reactive desulfurization and desiliconization. The production cost is high, the desulfurization efficiency is low, and the service life is short. It is reported that the highest desulfurization rate is 50-60%, and the service...

AI Technical Summary

Problems solved by technology

According to literature reports, at present, the refractory material for KR stirring paddle is mainly made of corundum-mullite castable, and its raw material is mainly composed of fused or sintered mullite, and then alumina micropowder, silica micropowder and high alumina cement are added. The service life is low, generally around 200 furnaces, and the manufacturing cost is relatively high, which increases the economic cost of molten iron desulfurization and desiliconization production