Why do coal flotation
Coal flotation is an important link in coal processing. It separates useful components in coal from impurities through physical and chemical methods, thereby improving the quality and utilization of coal. In recent years, with the improvement of environmental protection requirements and the optimization of energy structure, coal flotation technology has attracted much attention. This article will analyze the principles, advantages, application scenarios and related data of flotation.
1. The principle of flotation
Coal flotation is based on the differences in the physical and chemical properties of the mineral surface. By adding flotation agents (such as collectors, foaming agents, etc.), the coal particles are separated from impurities such as gangue and sulfide. The specific process is as follows:
1.Crushing and grinding: Crush the raw coal to the appropriate particle size for easier subsequent flotation.
2.Adding agent: Add specific agents according to the nature of the coal to change the surface properties of the particles.
3.Bubble attachment: The target mineral is allowed to adhere to the bubbles and float to the liquid level by stirring and inflation.
4.Separation and collection: Separate the flotation refined coal from tailings.
2. Advantages of flotation
Flotation technology has the following significant advantages:
| Advantages | illustrate |
|---|---|
| Improve coal quality | Remove impurities such as ash, sulfur, etc., and increase calorific value |
| Environmental benefits | Reduce pollutant emissions after combustion and meet environmental protection requirements |
| High resource utilization rate | Can handle low-grade coal and reduce resource waste |
III. Application scenarios of flotation
Flotation technology is widely used in the following fields:
1.Steam coal processing: Improve coal-fired efficiency and reduce power plant operating costs.
2.Coking coal purification: Reduce ash and sulfur content to meet coking requirements.
3.Coal slime recycling: Recover fine-grained coal from tailings of coal preparation plants to improve economic benefits.
4. Key data of flotation technology
Here is a typical data comparison of flotation techniques:
| index | Before flotation | After flotation |
|---|---|---|
| Ash (%) | 25-40 | 8-15 |
| Sulfur (%) | 1.5-3.0 | 0.5-1.2 |
| Care value (MJ/kg) | 20-24 | 26-30 |
5. Industry hot spots and future trends
In the past 10 days, topics related to coal flotation have mainly focused on the following aspects:
1.Research and development of new flotation agents: Environmentally friendly agents have become a research hotspot, aiming to reduce secondary pollution.
2.Intelligent flotation equipment: Optimize flotation parameters through AI technology to improve sorting efficiency.
3.Policy support: The state has issued policies to encourage the clean use of coal, and flotation technology has been tilted to funds.
Conclusion
Coal flotation is a key technology to improve coal quality and achieve clean utilization. With technological advancement and policy promotion, flotation will play a greater role in coal processing and provide support for the sustainable development of the energy industry.
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