Anhydrous environment-friendly taphole clay

Abstract

The invention discloses anhydrous environment-friendly taphole clay which comprises the following components in parts by weight: 8-20 parts of a waste skateboard material of not more than 5mm, 5-10 parts of high-alumina bauxite of 3-5mm, 10-20 parts of coke of not more than 3mm, 8-12 parts of black corundum of not more than 1mm, 10-15 parts of silicon carbide of not more than 1mm, 4-8 parts of kyanite powder, 8-12 parts of Guangxi mud, 5-8 parts of asphalt powder, 4-7 parts of graphite powder, 5-10 parts of silicon carbide powder, 2-5 parts of silicon nitride powder, 0.3-0.6 part of aluminum ashes and 12-16 parts of ethylene glycol-modified carbon-containing resin. The anhydrous environment-friendly taphole clay has the advantages of being good in environmental protection property, small in linear change rate in using process, stable in volume, free of a fracture taphole, easy to open, high in slag resistance, relatively small in operation intensity, high in adaptability to blast furnace condition, is especially suitable for a relatively large blast furnace, can play a key role in maintenance of the depth of the taphole.

Description

technical field [0001] The invention relates to an anhydrous environment-friendly gun clay, which belongs to the technical field of refractory materials. Background technique [0002] Gun clay is a kind of refractory plastic used to seal the blast furnace taphole, and plays an extremely important role in the blast furnace ironmaking process. It not only has the function of blocking the taphole, but also has the function of protecting the hearth of the furnace. It is an indispensable auxiliary material in the equipment and operation of the blast furnace. When the blast furnace does not produce molten iron slag, the blast furnace mud is filled in the tap hole to maintain a sufficient depth of the tap hole. When the blast furnace taps iron, the center of the tap hole mud is drilled out of the hole, and the tap hole diameter is kept stable by the tap hole. The iron is evenly tapped, and the molten iron slag is discharged out of the furnace through the tunnel, and finally the mo...

AI Technical Summary

Problems solved by technology

[0003] At present, tar or phenolic resin is mostly used as a binder in anhydrous taphole clay. The composition of tar is complex, the viscosity changes greatly, and it is not easy to disperse evenly, resulting in structural defects after sintering of taphole clay, and problems such as difficulty in sintering and slow hardening speed.

Moreover, tar contains carcinogen benzopyrene, the content is about 12000-13000ppm, and yellow smoke will be produced during the carbonization process, polluting the environment and affecting human health

In the technical solutions disclosed in patents CN104725063A, CN103787680A, CN104355628A, etc., phenolic resin is used as the binder. Due to the polymerization reaction in the phenolic resin, the viscosity of the phenolic resin combined with the gun clay will continue to increase during the mixing and storage process, and more phenolic resin to ensure the proper plasticity of the clay, and the shelf life of the clay is short

At the same time, the sintering temperature of phenolic resin is low, it is easy to sinter at the tap hole, it is difficult to muddy, and the tap hole is difficult to block and difficult to open

Moreover, the price of phenolic resin is high, which makes the production cost of gun clay high

The gun clay prepared in patents such as CN102515789A and CN102515790A shrinks greatly at high temperature and has high strength, which makes opening difficult

[0004] The environment-friendly anhydrous taphole mud prepared in the patent CN103880444A has poor adaptability to blast furnaces, and it is difficult to meet the use requirements of blast furnace conditions under changing conditions, and cannot maintain the iron hole