Dust pelletizing and briquetting is the process of compressing dust collected during steel production into pellets through specific techniques to achieve resource reuse. The following is the process flow of dust pelletizing and briquetting:
Raw Material Preparation
Dust: The primary raw material, including sintering dust, blast furnace dust, converter dust, and electric arc furnace dust, with an iron content ranging from 20% to 30%.
Blending: Additives such as coke or coal powder are incorporated to improve the properties of the pellets.
Binder: Commonly used materials include cement, water glass, water, etc., to ensure the strength and stability of the pellets.
Process Flow
1. Mixing and Crushing: Dust, additives, and binders are mixed in proportion and crushed to ensure uniform particle size of the materials.
2. Stirring: Binders are added to the mixed materials and thoroughly stirred to ensure even coating on the material surfaces.
3. Briquetting: A briquetting machine is used to compress the stirred materials into pellets. The pressure and dwell time of the machine are adjusted to ensure pellet density and strength.
4. Drying: The compressed pellets are naturally dried or baked to reduce moisture content and enhance their strength.
Key Process Points
Binder Selection: Choosing the appropriate binder is crucial for improving pellet formation rate and strength.
Material Ratio: A reasonable material ratio helps enhance the metallurgical properties of the pellets.
Briquetting Machine Parameters: Adjusting the pressure and frequency of the briquetting machine ensures uniformity and strength of the pellets.
Drying Conditions: Controlling drying time and temperature prevents pellet cracking or insufficient strength.
Through the dust pelletizing and briquetting process, steel enterprises can effectively utilize solid waste resources, reduce environmental pollution, and improve economic efficiency.