Smoke-free micro-expansive anhydrous stemming

Abstract

The invention discloses smoke-free micro-expansive anhydrous stemming, comprising the following components in parts by weight: 10-30 parts of corundum, 15-25 parts of alumina, 10-20 parts of silicon carbide, 10-25 parts of coke, 15-25 parts of clay, 5-10 parts of expanding agent and 15-18 parts of phenolic resin binder. The invention has the advantages that: in the stemming using process, yellow smoke is not generated, pungent smell is less, and the used phenolic resin binder has higher curing temperature and can meet the use requirements of the stemming. Because the expanding agent is added, the stemming can generate micro-expansion at the high temperature so as to fill cracks generated due to inside and outside stresses and modify the high temperature using performance of the stemming.

Description

technical field [0001] The invention relates to a smokeless micro-expansion anhydrous taphole clay suitable for a taphole of a large-scale ironmaking blast furnace. Background technique [0002] Gun clay is one of the most important consumable materials in the operation of blast furnace. Its function is to fill in the tap hole when the blast furnace does not produce slag and iron solution, so that the tap hole can maintain a sufficient depth; Drilling, the iron slag solution is discharged out of the furnace through the tunnel, and the taphole of the blast furnace is repeatedly opened and filled every day. The average annual consumption of blast furnace mud in my country is 1,800 tons per blast furnace. There are more than 3,000 blast furnaces in my country, and the demand for blast furnace mud More than 5 million tons / year. [0003] The environmental protection of gun clay is mainly reflected in the choice of binder. At present, domestic and foreign blast furnace taphole anh...

AI Technical Summary

Problems solved by technology

On the contact surface of the old and new clay, there will also be gaps due to the sintering and shrinkage of the new clay, so that the molten slag and iron liquid can easily penetrate into these gaps. When the iron hole is opened next time, under the strong erosion of the melt flow, the The gun mud is detached and damaged

In addition, the newly blocked gun mud is affected by the temperature inside and outside the iron hole, so that the sintering rate of the gun mud is not equal, thermal stress is generated in the gun mud, and micro cracks appear and gradually expand. If the crack extends to the entire iron hole section, it will The phenomenon of broken iron hole will seriously affect the production and operation of tapping

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