Anhydrous stemming for blast furnace

Abstract

The invention relates to an anhydrous stemming for a blast furnace. The anhydrous stemming is prepared from the following raw materials in percentages by weight: 30-40 percent of high-alumina bauxite, 10-15 percent of high-purity silicon carbide, 20-25 percent of soft clay, 10-25 percent of carbonaceous material, 5-15 percent of submicron powder, 15-25 percent of binding agent, and additionally silicon metal powder addictives accounting for 1-3 percent of the total weight of the raw materials. The anhydrous stemming has the advantages of favorable high-temperature fire performance, linearity change ratio of lower than 0.3 percent under the condition of 1400 DEG C*2h, breaking strength of more than or equal to 10MPa, high intensity, slag-iron resistant scouring, easy sintering, excellent work performance, less pollution and low production cost, and is beneficial to environment protection as well as popularization and application.

Description

1. Technical field: [0001] The invention relates to a refractory material for a blast furnace, which belongs to the technical field of metallurgy, in particular to an anhydrous taphole mud for a blast furnace. 2. Background technology: [0002] Large-scale blast furnaces in my country generally have one accidental slag outlet and one to four tapholes, and the amount of slag and iron discharged from the tapholes is large every day. Due to the disadvantages of low bulk density, poor sintering performance, high sintering shrinkage, easy cracks, and poor corrosion resistance to slag and iron, water-based cement is difficult to meet the needs, which requires the use of water-free cement. Anhydrous taphole mud generally uses corundum, silicon carbide combined with silicon nitride, coke powder, and combined clay as the main raw materials, and at the same time, different admixtures are added, and anthracene oil, washing oil or tar is used as the binder. This kind of gun mud is made...

AI Technical Summary

Problems solved by technology

But the problem is that this kind of gun mud pollutes the environment a lot, and a large amount of harmful gas will escape during the production, which will affect the health of the operator. Inconvenient and expensive to produce

[0003] Patent 03117339.x discloses an anhydrous blast furnace clay, which uses brown corundum, mullite, coke powder, clay, silicon carbide, sericite, pitch, anthracene oil, etc. as raw materials. The junction properties are good, but its production cost is high, and it is easy to pollute the environment, so it is difficult to meet the needs of industrial production

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