Gunning material for on-line quick ring forming of rotary kiln

Abstract

The invention relates to a gunning material for on-line quick ring forming of a rotary kiln. The gunning material comprises the following components in percentage by weight: 25-65 percent of iron ore powder with particle size of less than or equal to 0.1 mm, 2-15 percent of bentonite with particle size of less than or equal to 0.074, 0.1-9 percent of coal dust with particle size of less than or equal to 0.1 mm, 30-50 percent of refractory material powder with particle size of 1-3 mm and 0-5 percent of refractory material powder with particle size of less than or equal to 0.074 mm, wherein the gunning material also comprises a binding agent which accounts for 3-8 percent of the total weight of the materials; the binding agent is sodium metasilicate nonahydrate or sodium metasilicate pentahydrate. According to the gunning material, on-line gunning can be realized; a furnace lining foundation can be gunned without cleaning; the gunning quality is stable; a falling phenomenon is not easily produced; operation can also be stopped briefly to gun at high temperature; the operation is convenient; the cost of overhaul can be reduced from original 300,000 yuan each time to below 10,000 yuan; the time of overhaul each time can be shortened from original 72 hours to only 30 minutes; the operation rate of a unit is obviously increased; and the production cost is reduced.

Description

technical field [0001] The invention relates to a repairing material for refractory materials, in particular to a gunning material for fast online ring formation of a rotary kiln. Background technique [0002] The service life of the rotary kiln, such as the pellet rotary kiln, is generally only about 2 years at present, and the most severely damaged parts often appear at the kiln head and kiln tail. At present, the kiln head repair often adopts the semi-dry method of gunning after the rotary kiln is stopped and cooled, and the repair material is made of high-alumina materials combined with perhydrated glass. 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 temperatu...

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 furnace lining is strictly required, that is, it must be cleaned, otherwise, when the furnace lining foundation is dirty, it is easy to cause the gunning layer to fall off

It can be seen from all the literature consulted that people think that the formation of ring formation is an unfavorable factor to the rotary kiln. There is no public report on the restoration of the kiln

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