The blast furnace dust cover is severely corroded by acid and alkali, so it is better to use wear-resistant semi-lightweight refractory gunning mix.
1. Lightweight spray coatings have different body densities.
Lightweight refractory spray gunning mix have different body densities. If the body density is too light, it will not be wear-resistant. If the density is too high, the weight of the dust collector will be too heavy. The so-called lightweight spray coating is to play the role of thermal insulation and lining, but it must be lightweight and wear-resistant. It is a semi-light spray coating. It must not only play the role of thermal insulation, but also be wear-resistant and corrosion-resistant. It should be made of solid density. The spray paint is between 1.5-1.7, and the body density of 1.5-1.7 is a semi-light material.
Lightweight wear-resistant spray paint is also a common spray construction. However, if you want to be wear-resistant, corrosion-resistant, and have good volume stability, you must use ultra-fine powder technology on the basis of cement bonding. The addition of ultra-fine powder can make the spray The high-temperature volume of the coating is stable and its resistance to acid and alkali erosion is also improved.
2. What are the materials for refractory gunning mix ?
There are many materials for spray gunning mix , including cement-bonded, silica-sol-bonded, and aluminum-sol-bonded. However, depending on the location and temperature used, the combination methods are also different. Currently, many large-scale steel plants use silica sol-bonded linings for blast furnace linings, and their density requirements are high. And if it is a hot blast stove with a lining density of 2.0, it is bonded with cement.
3. The chimney lining is generally semi-lightweight acid-resistant refractory gunning mix
Generally, the spray coatings used for chimney linings are basically the same as those used for blast furnace dust hoods. Semi-lightweight spray gunning mix are often used because the corrosive atmosphere in the chimney is acidic, so semi-light acid-resistant spray coatings are used, which is also dense. Between 1.5-1.7.
The dust cover of the blast furnace has both acid and alkali components, so the light spray paint selected should resist the erosion of both acid and alkali components. Then the wear resistance is very important, and the internal components must also have acid and alkali resistance.
To sum up, it is most suitable to use wear-resistant lightweight refractory spray gunning mix with semi-light acid and alkali-resistant components for the blast furnace dust cover.
