Discussion on the Spraying Technology of Refractory Coating for Metallurgical Rotary Kiln
Discussion on the Spraying Technology of Refractory Coating for Metallurgical Rotary Kiln
When selecting the rotary kiln, we should not only look at the purity of the products calcined by the rotary kiln, working efficiency, sealing, safety, and operability, but also look at whether the structure of each part can achieve good performance, and also pay special attention to whether the refractory coating on the surface of the rotary kiln is uniform and meets the production requirements, because the temperature in the kiln body where the rotary kiln is used to calcine materials will be very high, Therefore, the requirements for coating technology of refractory materials will also be relatively high. The temperature produced in the kiln body during the calcination of the metallurgical rotary kiln is higher than that produced in the general kiln body, which requires that the spraying technology of refractory materials of the metallurgical rotary kiln should be quite high. Therefore, this paper will take the metallurgical rotary kiln as an example to explain the spraying technology of refractory materials.
When spraying refractory materials on the surface of the kiln body, a simple experiment should be carried out first. Grab a certain amount of raw materials by hand and put them on the square steel plate with anchor nails to determine the adhesion, and determine the proportion of other raw materials in the mixed raw materials according to the experimental results. The spraying shall be carried out in the direction around the spring, and there shall be no interruption during the spraying, and the spraying shall be carried out until the specified thickness is reached. There should be a certain distance between the spray gun and the kiln body during spraying, which is generally required to be about 1 meter, so that the spray material can be evenly sprayed when it is sprayed on the surface of the kiln body, reducing the waste of raw materials by re-spraying.
When spraying the surface of the kiln body of the rotary kiln, there are also requirements for the selection of the spray gun head, and generally select wear-resistant and smooth materials for the material requirements; For the size of the nozzle, the nozzle with an inner diameter of 35 mm and a length of about 600 mm is generally selected, because such nozzle has better stability when spraying, and it is evenly sprayed on the surface of the kiln body, without accumulation. In addition, thermoplastic elastic rubber material should be used as far as possible when selecting materials, because compared with ordinary materials, this material has a longer service cycle, is lighter and wear-resistant, is also safer in the process of use, and is not easy to cause pipe plugging. It is a good choice of nozzle material.
Therefore, the effect of spraying refractory on the kiln surface is also an important factor affecting the purity of the product.