Maintenance method for iron notch of European smelting furnace

Abstract

The invention discloses a maintenance method for an iron notch of a European smelting furnace. The method comprises the following operation steps that 1) a water-free stemming iron plugging port withgood quick-drying and quick-hardening performance is selected, and 1-2% of silicon nitride and 2-3% of aluminum micropowder are added into stemming, the slag iron scouring resistance of the stemming is improved, sintering of stemming in a duct is accelerated in a mode of pre-opening of the iron notch and baking and temperature raising of an iron notch channel, the slag iron scouring resistance ofthe stemming is further improved, and the iron tapping amount of a single furnace is controlled below 450 tons / furnace by controlling the iron tapping interval time; 2) an oxygen supply parameter above the iron notch is controlled, and oxygen supply at an air port above the iron notch is stopped; 3) tapping time is controlled to tap clean slag iron as much as possible; and 4) sectional mud beatingis carried out, wherein the first section is only used as a channel for sealing the iron notch, after 10 seconds of stopping, after half coke and coke in a cavity at the front end of the iron notch settle down, a second section of stemming starts to be beaten to form an initial stemming bag, then after 10 seconds of stopping, a third section is beaten, and all the stemming is beaten in sequence in four sections, wherein the beating amount of each section is 40 L, and it is ensured that the beaten-in stemming forms a stable stemming bag in a furnace cylinder.

Description

Technical field [0001] The invention relates to a method for maintaining the iron hole of an Ouyeel furnace. Background technique [0002] The European smelter ironmaking process is the world's largest non-blast furnace ironmaking process. It can directly use non-coking coal to produce molten iron, breaking through the traditional blast furnace ironmaking coking coal resource dependence. In terms of environmental protection, it has an unmatched advantage over blast furnaces. However, the height of the material column in the gasification furnace of Ouyeel is only about 8 meters, compared with the height of nearly 25 meters in the 2500 m3 blast furnace. The material is suspended on the surface of the slag and iron in the gasifier, and the slag and iron surface are up and down. float. The main fuel of Ouyeel's furnace is molybdenum. According to the analysis and analysis of the previous shutdowns of Ouyeel's furnace, most of the molybdenum has been pulverized during gasification, ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a maintenance method for the Ouyeel furnace taphole, which can solve the problem that the Ouyeel furnace taphole mud cannon is difficult to form