Water-free stemming for medium and large blast furnace

Abstract

The invention discloses water-free stemming for a medium and large blast furnace. The water-free stemming is prepared from the following raw materials in percentage by weight: 3-7% of special-grade homogenized bauxite particles, 18-25% of brown fused alumina particles, 2-7% of white fused alumina particles, 3-7% of tabular corundum powder, 3-6% of chromite sand powder, 11-21% of carbon resistance material, 3-6% of asphalt powder, 2-5% of carbon composite micropowder, 5-11% of silicon carbide powder, 3-6% of silicon carbide particles, 1-3% of ferro silicon nitride particles, 3-7% of silicon powder, 7-10% of guangxi soil, 2-5% of sericite and 10-13% of compound oil. The water-free stemming has the advantages that the slag erosion resistance of the traditional water-free stemming is improved; the high-temperature molten iron scouring resistance and wear resistance of the water-free stemming are enhanced; the anti-blocking property and iron cinder scouring resistance of the traditional water-free stemming are improved; the quality stability of the water-free stemming is improved; meanwhile, a resistance material of a byproduct generated by melting carbon electrodes is also utilized, so that the resource and the environment are more favorably protected.

Description

technical field [0001] The invention relates to refractory materials, in particular to an anhydrous taphole mud for large and medium-sized blast furnaces. Background technique [0002] Blast furnace ironmaking is currently the most important ironmaking method in the world. As of 2013, my country's molten iron production reached nearly 800 million tons. Due to the low output, serious energy consumption and serious pollution of small blast furnaces, they have been gradually phased out. Currently, 1260m 3 The production of the above-mentioned large and medium-sized blast furnaces in the field of ironmaking accounts for more than 65% of the domestic molten iron production. Large and medium-sized blast furnaces have high smelting intensity, large output, and long tapping time; when tapping, a large amount of slag will flow out with the molten iron from the anhydrous taphole hole of the taphole. The damage to the durability of anhydrous taphole mud is higher than that of molten ...

AI Technical Summary

Problems solved by technology

Large and medium-sized blast furnaces have high smelting intensity, large output, and long tapping time; when tapping, a large amount of slag will flow out with the molten iron from the anhydrous taphole hole of the taphole. The damage to the durability of anhydrous taphole clay is higher than the high temperature erosion of molten iron, so it often occurs that the tapping time and the amount of iron tapping are not enough due to the poor resistance to slag erosion of anhydrous taphole clay