Steel plant dust ash binder is widely used in the metallurgical industry, mainly used to deal with the large amount of dust ash generated by steel plants during the production process. The following are its main application areas and specific implementation methods:
1. Recycling of dust ash
Resource recovery: Dust ash contains a large amount of iron elements. Direct transportation will not only cause dust pollution, but also lead to the loss of iron elements. By using binders to cold-press the dust ash into shape and recycle it as a furnace charge, these valuable resources can be effectively recycled.
Environmental protection: The application of dust ash binder helps to reduce environmental pollution. Dust ash has high fineness. If it is stored in the open air, it is easy to cause serious dust problems. Cold pressing can avoid this problem and realize resource reuse at the same time.
2. Production of cold-pressed pellets
Selection of binder: According to the physical and chemical properties of dust ash, select a suitable binder. Common types of binders include polymer environmentally friendly materials, composite binders, etc. These binders have high water absorption and adhesion, and can improve the forming rate and strength of pellets without increasing ash content or reducing calorific value.
Operation steps:
Raw material preparation: Mix dust ash and adhesive in a certain proportion, usually with an adhesive dosage of 1-3%.
Wetting: Spray an appropriate amount of water depending on the humidity of the material to make the material reach an appropriate humidity.
Stirring: Stir the mixed material evenly to ensure that the adhesive is fully dispersed.
Balling: Hold the stirred material in hand and then press the ball.
Drying: Dry the pressed ball. The dried ball should have a high compressive strength. Usually, the compressive strength of a single ball is ≥2000N.
3. Process optimization
Treatment of calcium oxide: Dust ash usually contains a large amount of calcium oxide (lime). Calcium oxide will release heat and expand when it meets water, affecting the forming rate and strength of the ball. Therefore, calcium oxide needs to be digested before using the adhesive. For manufacturers that do not have the conditions for digestion, new adhesives specifically for undigested dust ash can be selected.
Cost control: Choosing efficient and low-cost adhesives can significantly reduce the cost of dust ash pressing and improve economic benefits.
4. Application Cases
Baosteel and Hebei Iron and Steel Group: These two steel mills have achieved industrial production of dust ash pellets, but the strength of the pellets will decline in the later stage. This shows that although the technology is mature, it still needs to be continuously optimized to improve the long-term performance of the pellets.
Henan Jinhan Environmental Protection Technology Co., Ltd.: The company has successfully developed a series of adhesives suitable for cold pressing of dust ash. Its products have the characteristics of strong adhesion, high forming rate, and good cold pressing strength, and have been used in many steel mills.
5. Environmental protection and sustainable development
Policy support: With the increasingly stringent environmental protection regulations, the recycling of steel mill dust ash has become an inevitable trend. The use of efficient dust ash adhesives can not only reduce environmental pollution, but also improve resource utilization, which meets the requirements of sustainable development.
Technological innovation: Continuously developing new adhesives and improving their performance and applicability are important directions to promote the recycling of steel mill dust ash.
Through the above applications, it can be seen that steel mill dust ash adhesives play an important role in resource recovery, environmental protection and economic benefit improvement. In the future, with the continuous advancement of technology, its application prospects will be broader.
