Nonstick coating used on oxygen lance of steelmaking converter

Abstract

The invention relates to a nonstick coating used on an oxygen lance of a steelmaking converter, which comprises refractory powders and a wedding agent, wherein, the refractory powders are 30 to 50 percent by weight percentage, and the wedding agent is 50 to 70 percent by weight percentage. The refractory powders include the materials as follows by weight percentage: 40 to 70 percent of graphite in soil form, 10 to 30 percent of high alumina bauxite, 5 to 15 percent of refractory clays, 3 to 8 percent of swell soils and 3 to 8 percent of Tylose; the wedding agent is a water-based wedding agent, and includes the materials as follows by weight percentage: 15 to 30 percent of yellow starch gums, 8 to 15 percent of sodium hudroxide and 5 to 15 percent of boric acid. The nonstick coating solves the problems that the surface of the oxygen lance of the steelmaking converter is stuck with steel slag severely, and the steel slag is hard to scrape down. The coating on the oxygen lance prevents the steel slag from directly contacting an oxygen lance body, the coating that has worse wettability with the steel slag leads the adhesive property of the steel slag splashed onto the surface of the oxygen lance to become worse, and the oxygen lance does not bond with the steel slag no longer basically after the steel slag is scraped down through an oxygen lance slag scraper, thereby leading the work intensity of workers to be reduced greatly, and avoiding the hidden dangers when deslagging by using a knockout bar.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an anti-adhesive coating for an oxygen lance of a steelmaking converter. Background technique [0002] The working environment of the converter oxygen lance is very harsh. During the steelmaking process of about 20 minutes per furnace, it has to withstand CO, CO 2 and O 2 Changes in the oxidation and reduction atmosphere caused by changes in the composition of the furnace gas, as well as the splashing and erosion of steel slag, the temperature in the furnace, the splashing of molten steel and the composition of slag, etc. [0003] Due to the production characteristics of the converter itself, the surface of the converter oxygen lance generally has the problem of sticking steel slag. When the bonded steel slag is serious, it will cause the oxygen lance to be lifted out of the furnace mouth (because the cold steel stuck on the nitrogen seal cannot come out). At thi...

AI Technical Summary

Problems solved by technology

When the bonded steel slag is serious, it will cause the oxygen lance to be lifted out of the furnace mouth (because the cold steel stuck on the nitrogen seal cannot come out). At this time, the furnace cannot be tilted, which will affect the blowing operation; Destroy the counterweight balance of the oxygen lance transmission system, and even make the oxygen lance unable to be lifted (when the weight of bonded steel slag plus the self-weight of the oxygen lance is greater than the weight of the counterweight, the oxygen lance cannot be lifted)