Hot repair mat for molten iron desulphurization

Abstract

The invention aims to disclose a hot repair mat for molten iron desulphurization, which comprises the following components in percentage by weight: 10 to 24 percent of special-grade flint clay, 40 to 54 percent of bauxite chamotte, 5 to 10 percent of silicon carbide fine powder, 4 to 8 percent of alumina submicron powder, 5 to 10 percent of binding clay, 4 to 8 percent of expanding agent, 0.5 to 1.5 percent of additive and 10 to 15 percent of additional bonding agent. Compared with an existing product, the hot repair mat for molten iron desulphurization has the technical characteristics of good high temperature adhesivity, high bonding strength, good thermal shock resistance, antistrip performance, resistance to erosion and wear, good plasticity and the like, can meet the requirement of different molten iron desulphurization equipment on rapid hot repair, adopts easily obtained raw materials, is low in cost, has a long service life and fulfills the aim of the invention.

Description

technical field [0001] The invention relates to a hot-state repairing material, in particular to a hot-state repairing material for hot-metal desulfurization used in the field of hot-state repairing of molten iron desulfurization equipment in the field of refractory materials for hot metal desulfurization pretreatment. Background technique [0002] Due to changes in market demand, higher requirements are placed on steel types. In order to improve the competitive advantage, many enterprises at home and abroad pre-treat the molten iron before steelmaking to reduce the sulfur and other impurities in the molten steel to reduce the pressure of converter steelmaking, and constantly optimize the iron and steel smelting technology to achieve low cost and high profit, thereby improving steel products final quality. [0003] As the two main modes of hot metal pretreatment, lance injection and KR stirring paddle desulfurization have been widely promoted and applied. In the desulfuriz...

AI Technical Summary

Problems solved by technology

In the desulfurization treatment of molten iron, no matter whether spray gun injection or KR stirring paddle stirring desulfurization is adopted, it must withstand the erosion, erosion and frequent rapid cooling and rapid temperature changes of high-temperature molten iron, which will eventually lead to cracking, peeling and wear of the refractory lining Such damage seriously affects the service life of the desulfurization equipment and increases the production cost

[0004] In order to improve the service life, most domestic refractory plastics are used to repair desulfurization equipment. However, in the actual use process, plastics have poor high-temperature adhesion performance, large shrinkage, easy cracking and peeling of the repair layer, poor thermal shock stability, and low strength. Not resistant to erosion, the quality is very unstable