On-line quick repair material for rotary kiln

Abstract

The invention relates to an on-line quick repair material for a rotary kiln. The on-line quick repair material comprises the following components in percentage by weight: 55-85 percent of Al2O3, 10-25 percent of SiO2, 0.1-15 percent of MgO, 0.01-5 percent of Fe, 0.01-3 percent of Al, 0.1-3 percent of Fe2O3 and silica sol binding agent, wherein the silica sol binding agent accounts for 8-20 percent of the total amount. According to the on-line quick repair material, on-line spray pair can be realized; the spray pair is performed on a furnace lining foundation without cleaning; the repair quality is stable; a stripping phenomenon is not easily produced; the maintenance cost is reduced from hundreds of thousands of yuan required at one time at present to tens of thousands of yuan, i.e., the maintenance cost is saved by one tenth; and the application period can be increased by 50 percent or more.

Description

Technical field [0001] The invention relates to a refractory repair material, in particular to an online quick repair material for a rotary kiln. Background technique [0002] The life cycle of the rotary kiln, such as the pellet rotary kiln, is generally only about 2 years. The most severely damaged parts often appear in the kiln head and kiln tail. At present, kiln head repairs often use semi-dry gunning after the rotary kiln is shut down and cooled. The repair materials are high-alumina materials combined with water glass. The shortcomings of using semi-dry gunning are: it requires the unit to stop operation and takes a long time for overhaul and maintenance, which leads to a reduction in the operation rate of the unit, and the cost of overhaul can reach tens of millions. The shortcomings of the high aluminum material combined with water glass are: The bonding is not strong at high temperatures, and the furnace lining is strictly required to be cleaned, otherwise the gunning ...

AI Technical Summary

Problems solved by technology

The disadvantage of using the semi-dry gunning method is that the unit needs to stop working, and it takes a long time for maintenance, resulting in a reduction in the unit’s operating rate, and the cost of overhaul can reach tens of millions of yuan; the disadvantages of the high-alumina material combined with water glass are: The bonding is not firm at high temperature, and the requirements for the furnace lining are strict. Cleaning must be carried out, otherwise, when the furnace lining foundation is too dirty, it is easy to cause the gunning layer to fall off.

This invention has no binding agent, even if water is used as a binding agent, it will not develop strength, and it is considered unusable

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