1.How are different categories recycled?
Complete galvanized elbow: Directly into the crushing line
With flange assembly: Separation by hydraulic shears
With threaded interface: Flame cutting to remove the threaded section
2.How to clean the surface?
Physical method: Dry ice blasting (-78℃ CO₂ particles) to remove oil/coating
Chemical method: Neutral cleaning agent (pH=6.5~7.5) cyclic spraying
Target: Residual pollutants <50mg/kg (RoHS compliant)
3.How to recycle the zinc coating?
Mechanical stripping method: high-pressure water jet (250MPa) strips the zinc layer → crushes it into zinc slag welding wire raw material (Zn≥98%)
Cold spray regeneration: recycled zinc powder + high-pressure gas → direct spray repair of old elbows (bonding strength＞30MPa).
4.What is the development trend?
Short-process regeneration: Develop zinc layer in-situ repair technology (reduce remelting energy consumption)
Blockchain traceability: record elbow life cycle data (optimize recycling solutions)
Urban mine development: establish regional recycling centers (50 km radiation radius)
5.How can waste residue be processed to become new resources?
Acid leaching iron slag: Magnetic separation to recover iron → Steelmaking, used as converter coolant.
Zinc distillation residue: Extract indium and cadmium (＞99%), used as scattered metal raw materials.
Neutralized sludge: Sintered to make ceramsite, used as building materials