Description of Refractory Gunning Mix
Refractory Gunning Mix is a refractory concrete block used for repairing thermal installations, applied from a distance by a mechanized method using a spraying machine. Spray coating is an amorphous powdered (particle size from < 0.1 to 3-5 mm) refractory material used for coating or lining application using a shotcrete machine.
Composition of refractory gunning mix
The gunning mix of high temperature stable refractory fillers, finely ground additives, plasticizers, water and binders. The particle size composition of the fillers must be correctly selected and adjusted. Clay and sintering agents are added as required. The properties of the gunning mix depend on the composition and particle size of the fillers as well as the type and amount of binders. When selecting the characteristics of the shotcrete quality before the preparation of the spraying material, we decide on the purpose of the furnace, ladles and other equipment.
Classification of refractory gunning mix
Gunite masses are divided into: fier clay and high-alumina (for repairing the linings of steel-pouring ladles, blast furnace shafts), lime-periclase and lime with carbon additives (for torch gunning of oxygen converters), periclase and periclase-chromite (for gunning the rear walls and arches of open-hearth furnaces, mixers, ladles, smelting units of the Central Masonry Plant), silica (for repairing the silica masonry of coke ovens), etc.
Physical and chemical indicators of refractory gunning mix
Fire clay gunning mix
| Name of indicators | МШГ |
|---|---|
| ссовая доля Al2O3, %, не менее | 28 |
| Fe2O3, %, ≤ | 1,5 |
| Изменение массы при прокаливании, %, не более | 4,5 |
| Fire resistance, °С, not lower | 1680 |
| Массовая доля влаги при отгрузке, %, | не более 7 |
| Зерновой состав 2, % : | |
| проход через сетку № 3,2, не менее | 100 |
| проход через сетку № 2, не менее | 90 |
| проход через сетку № 05, | не менее 60 |
| проход через сетку № 009, пределах | 30-50 |
Magnesia gunning mix
| Mark | СТМП-1 | СТМП-3 | СМПТ |
|---|---|---|---|
| Назначение | Рабочая футеровка промковшей | Ремонт наружной футеровки патрубков вакууматора | |
| показатели* | |||
| Зернистость, мм | 1-0 | 5-0 | 3-0 |
| Химический состав, % | |||
| MgO | 82-84 | 82-84 | 84-86 |
| CaO | 3-3,8 | 3-3,8 | 2,5-5,0 |
| SiO2 | 4-7 | 4-7 | 4-7 |
| Изменение массы при прокаливании, % | 2,5-3,0 | 2,5-3,0 | 0,2-0,4 |
| Массовая доля влаги, % | 1-1,5 | 1-1,5 | 0,2-0,4 |
Advantages of refractory gunning mix
Refractoriness
The main advantage of refractory gunning mix is its ability to withstand high temperatures without degradation or deformation. This makes it an ideal material for industrial furnaces, boilers, chimneys and other high heat load applications.
High strength
The gunning mix has excellent strength and adhesion to a variety of surfaces. It creates a durable, reliable fire-resistant coating that can withstand mechanical loads and impacts.
Abrasion resistance
The gunning mix has good wear resistance and is a durable material even under frequent use and high wear conditions.
Minimum hardware requirements
Gunning mix does not require complicated or expensive equipment. Gunning mix is very commonly used and comes in a variety of sizes to suit different types of projects.
Improved thermal insulation
Refractory gunning mix can significantly improve the thermal insulation properties of objects, helping to reduce energy consumption and increase the efficiency of industrial equipment and systems.
Possibility of repair and restoration
Gunning mix can be used to repair and restore damaged or worn refractory coatings, saving the time and resources of replacing the entire structure.
Applications of refractory gunning mix
Cement industry
Refractory gunning mix is used to protect surfaces in cement kilns, rotary kilns and other equipment where high temperatures and exposure to harsh environments may cause surface wear and damage.
Glass industry
Gunning mix can be used to form refractory layers on the surfaces of glass furnaces and other equipment used in glass production.
Chemical industry
Refractory gunning mix can be used to protect the surfaces of chemical plants, reactors, towers and other chemical industry equipment.
Metallurgical industry
efractory gunning mix can be used to form a refractory layer on the surface of metal kilns, steel furnaces, ladles, and other equipment used in the metallurgical industry. It protects metal structures from high temperatures and chemical effects.
Oil and Gas Industry
Refractory gunning mix is used to protect surfaces in refineries, oil depots, gas pipelines and other facilities where high temperatures and corrosive environments can cause surface damage.
Power plants
In the energy industry, refractory gunning mix is used to protect and insulate steam boilers, turbines, chimneys, furnaces and other equipment. It provides reliable high temperature protection, prevents damage and ensures safe operation of power plants.
