Anhydrous stemming for large and medium sized blast furnace and preparation method of anhydrous stemming

Abstract

The invention relates to an anhydrous stemming for a large and medium sized blast furnace and a preparation method of the anhydrous stemming. The stemming comprises the raw materials of bauxites aggregate and fine powder, silicon carbide aggregate and fine powder, coke, plastic clay powder, asphalt powder and a micro powder additive, the micro powder additive comprises metallic silicon powder, metallic aluminum powder, high-carbon resin powder, alumina micro powder, silica fume, sodium carboxymethyl cellulose and sodium hexametaphosphate in parts by weight, and tar is taken as a binding agent in the producing and stirring processes. The anhydrous stemming realizes high-temperature rapid sintering of the stemming, the binding degree of new and old stemming is strengthened, the capability of resisting scouring of an iron slag of a mud drum of an iron notch is improved, the porosity of the stemming material is low, the compactness of the stemming material is good, the property of resisting corrosion and permeation of an iron slag liquid of the stemming is strengthened, the stemming is favorable for keeping the depth of the iron notch and the stability of the pore size of the iron notch, and can well adapt to the performance requirement of enlargement of the blast furnace on the stemming of the iron notch.

Description

technical field [0001] The invention relates to the technical field of metallurgical refractory materials, and specifically includes an anhydrous taphole mud for large and medium-sized blast furnaces and a preparation method thereof. Background technique [0002] Anhydrous taphole clay is a kind of refractory plastic used to seal the blast furnace taphole. The blast furnace taphole area is the most serious part of slag and iron erosion and erosion, which affects the service life of the blast furnace. Anhydrous taphole mud is pressed into the blast furnace, which can form a mud bag in the tap hole area, inhibit the erosion and erosion of the tap hole area by the molten iron circulation inside the blast furnace, and protect the hearth in the tap hole area, so it plays a key role in the longevity of the blast furnace. [0003] The taphole of the blast furnace has to be opened and filled many times every day, and the hot molten iron and slag liquid will physically and chemicall...

AI Technical Summary

Problems solved by technology

[0005] Most of the anhydrous taphole clays widely used at present use tar, asphalt, plastic clay, etc. as binders, and sericite as a medium-temperature sintering agent; This kind of bonding strength is generally low, and its erosion resistance is poor; the volatile matter in tar and asphalt escapes, and the porosity increases, which is not conducive to the material's resistance to the penetration of slag; sericite can realize rapid sintering of gun clay, However, too much addition will lead to the decline of the anti-erosion performance of the clay in the high temperature stage

However, the quality of gun mud is poor, and a series of problems such as wet iron hole, shallow iron hole, broken iron hole, and large flow will appear during use, which will affect normal production and even cause personal injury accidents.

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