Single-field anhydrous stemming for high-strength smelting small blast furnace as well as preparation method and application of single-field anhydrous stemming

Abstract

The invention discloses single-field anhydrous stemming for a high-strength smelting small blast furnace as well as a preparation method and application of the single-field anhydrous stemming. The raw materials comprise, by mass, 20-30% of refractory aggregate, 10-20% of refractory fine powder, 8-15% of soft binding clay, 7-12% of feldspar powder, 15-20% of coke foam, 15-25% of an anti-erosion agent, 1-5% of waste high thermal conductivity graphite electrode powder, 0.5-2% of phenolic resin powder, and 3-8% of high temperature modified asphalt; the raw materials are mixed according to the proportion, tar serves as a binding agent, mud is discharged after the mixture is mixed and ground to a proper state, and the anhydrous stemming is obtained through mud extrusion forming. And the anhydrous stemming is transferred to a site, and is put into the furnace from an iron notch channel by using a mud gun machine to form a mud drum on the furnace wall. The water-free stemming has the advantages of favorable mud making performance, high curing speed, short blasting time, favorable sintering property, no dense smoke in the tapping process, basically no need of baking an iron notch, 25-30 minutes of tapping interval, short splashing time and favorable scouring and erosion resistance, and can meet the harsh requirements of high-strength smelting of small blast furnaces on the water-free stemming.

Description

technical field [0001] The invention relates to the technical fields of refractory materials and metallurgy, in particular to a single field anhydrous taphole mud for high-strength smelting small blast furnaces and its preparation method and application, which are mainly used for blocking the tapholes of small blast furnaces. Background technique [0002] In recent years, although the large-scale blast furnace is an irreversible trend, there are still many small blast furnaces in service in China, and large-scale blast furnace materials cannot be applied to small blast furnaces, and with the continuous improvement of smelting technology, domestic small blast furnaces Most of the blast furnaces have the following characteristics: 1) high-strength smelting technology is adopted, and the utilization factor is high; 2) the ore grade continues to decline, and the slag-iron ratio does not increase much; 3) the slag basicity is mostly increased to about 1.2; 4) the iron tapping inte...

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Problems solved by technology

[0005] 2) Excellent sintering performance: if the interval time is too short, high tide mud is likely to appear during the opening process. In order to avoid thick smoke, violent splashing, and even rockets after opening the iron hole, it is often necessary to drill slowly and use compressed air for a long time. It takes a long time to bake the iron mouth once, which not only increases the labor intensity of wor...

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