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Fly Ash Class F
Fly ash class F refers to fly ash obtained from low-ash coal powder through mechanical grinding and screening. Its main components are silicic acid, iron oxide, magnesium oxide and other compounds. According to different coal mining areas, It can be divided into three categories: FⅠ, FⅡ and FⅢ. Fly ash class F has the characteristics of high active ingredients and strong penetration ability, and is suitable for building materials industries such as high-strength concrete and cement products.
Fly ash can be divided into Category F and Category C according to national standards, mainly based on the calcium oxide (CaO) content in fly ash.Class F fly ash refers to calcium oxide content less than 10%. The main characteristics are lighter gray matter, lighter color, better fineness and activity.
chemical composition
| Fly Ash | Grade | |||
| Class | I | II | III | |
| Fineness(45μm square mesh sieve)≤/% | F,C | 12 | 25 | 45 |
| Water-cement ratio≤1% | F,C | 95 | 105 | 115 |
| Loss onignition≤1% | F,C | 5 | 8 | 15 |
| Moisture≤1% | F,C | 1 | ||
| SO₃ ≤/% | F,C | 3 | ||
| Free Ca0≤/% | F | 1 | ||
| C | 4 | |||
Physical properties and composition
1. Source:F-class fly ash is obtained by collecting and processing the ash generated when burning coal. It mainly comes from the unburned part of coal combustion, such as minerals and residual carbon in coal.
2. Particle size and appearance:F-class fly ash is usually in the form of gray powder, and its particle size is generally fine, and most of it can pass through a standard sieve.
3. Chemical composition:The main components include silicon oxide (SiO₂), aluminum oxide (Al₂O₃), iron oxide (Fe₂O₃) and calcium oxide (CaO), and also contain a small amount of inorganic impurities and unburned carbon.
The following is an introduction to the functions
Building materials:
Due to the physical and chemical properties and good mechanical properties, the production of fly ash bricks, fly ash concrete (referred to as: powder concrete) and other products has been a popular application in recent years. Compared with ordinary concrete, the strength, penetration resistance, weather resistance and thermal insulation performance of powdered concrete have been improved to varying degrees. At the same time, it can effectively improve production and processing efficiency and save production costs.
Environmental protection:
Coal combustion produces a large amount of carbon dioxide and other pollutants, including fly ash. However, making full use of the product can reduce its impact on the environment. At the same time, the hazards caused by handling and storage can be reduced during utilization.
Road construction:
After appropriate processing and treatment, it can be made into a stabilizer, which can be used for road reinforcement and reinforcement to improve the crack resistance, water resistance and frost resistance of the road, while reducing the configuration cost and cost of asphalt concrete. Construction technical difficulty.
Cement production:
The use of fly ash to produce cement is one of the main application areas of fly ash. It can replace part of cement clinker and be used to produce cement. Adding fly ash can enhance cement durability and corrosion resistance while reducing production costs and demand for natural resources.
Power generation industry:
It can also be used as clean energy for recycling during the combustion process. During the treatment process, it can be used as an auxiliary fuel for other energy sources, such as castor oil and other vegetable oil by-products.
In short, after proper treatment and utilization, fly ash can be converted into a high-value resource, while also causing less impact on the environment and ecology, and has broad application and development prospects.
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