Environmentally friendly anhydrous taphole clay

Abstract

The invention discloses environmental-friendly anhydrous stemming, and belongs to the technical field of anhydrous stemming for a blast furnace. In parts by weight, 10 to 15 parts of a binding agent is added into a mixture containing 25 to 35 parts of brown fused alumina aggregates, 10 to 20 parts of high-aluminum fine powder, 8 to 15 parts of clay, 5 to 8 parts of kyanite, 10 to 20 parts of composite carbon material, 5 to 15 parts of ferro silicon nitride and 10 to 20 parts of silicon carbide, and then rolling and mixing are carried out to form the environmental-friendly anhydrous stemming. The environmental-friendly anhydrous stemming not only contains few harmful substances, has no smoke dust, is harmless to human bodies and has little influence on the environment, but also has the advantage of durability.

Description

technical field [0001] The invention relates to the technical field of anhydrous taphole clay for blast furnaces, in particular to an environment-friendly anhydrous taphole clay. Background technique [0002] Gun clay is an unshaped refractory material for blocking the iron gate made of aluminum silicate materials, silicon carbide, coke particles and other materials, as well as binders and admixtures. It is also a key functional material for smooth and safe ironmaking in blast furnaces. During the operation of the blast furnace, the three functions of blast furnace mud are: blocking the taphole, stably discharging molten iron and slag, protecting the hearth, and prolonging the life of the side bricks at the bottom of the blast furnace. At present, taphole clay can be divided into two categories: water taphole clay and anhydrous taphole clay. The former is used in small and medium-sized blast furnaces with low top pressure and low degree of intensified smelting, while the lat...

AI Technical Summary

Problems solved by technology

Traditional blast furnace clay binders are rich in coal tar and pitch, and coal tar and pitch are complex polycyclic aromatic hydrocarbons. They have excellent plasticity and durability, but they emit acid, spicy, Smelly gas and yellow smog, especially when 10% to 15% coal tar is added to the gun mud, the benzopyrene content reaches more than 7000ppm. As we all know, benzopyrene is one of the world's recognized carcinogens, which poses a serious threat to human health

[0004] The existing authorization announcement date is 2012.09.05 and the authorization announcement number is CN101580397B patent document "A Blast Furnace Clay with Low Benzopyrene Content", which uses a carbon-containing resin with a fixed carbon content of 30-85% by mass , and adding industrial alcohol and ethylene glycol as carbon-containing resin solvent as the binder of blast furnace clay, prepared blast furnace clay with a low benzopyrene content of no more than 1000ppm, but the binder adopts resin binding, resin There are a large amount of unreacted benzene and formaldehyde in it, so there is still the problem of environmental pollution

[0005] The existing publication date is 2009.12.30, and the publication number is CN101613213A patent document "environmental protection type gun mud for blast furnace iron tapping and its preparation method" discloses the use of high temperature asphalt 1-5%, inorganic phosphate 3-8% and Modified powder resin 1-5% is used as a binder to prepare gun clay, and a mixture of organic and inorganic substances is used as a binder to prepare gun clay, which reduces the content of tar components that pollute the environment, but the high-temperature asphalt in the binder is still There is pollution to the environment

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