Building Materials and Concrete Aggregates
Hengji Magnetic Separation Solutions for Construction & Aggregates Industry
Hengji provides high-performance magnetic separation technology engineered for the rigorous demands of aggregate processing, manufactured sand production, and construction waste recycling. Our equipment safeguards critical machinery, enhances material quality, ensures product compliance, and unlocks significant operational savings by removing ferrous contaminants at every production stage.
I. Key Applications & Solutions:
Pre-Crushing Tramp Iron Removal (Raw Material Protection)
• Equipment : HCG Series Dry Drum Magnetic Separators (e.g., HCG-1050×2100)
• Key Benefits :
▫ Removes damaging metal contaminants (nails, rebar fragments, bolts; 0-12mm) from feed material.
▫ Protects crusher hammers, extending service life by up to 3x.
▫ Improves feed grade by 15% (verified iron impurities ≤0.01%).
▫ Prevents costly downstream equipment damage.
II. Manufactured Sand Iron Contamination Control (Quality Assurance)
• Equipment: RCYG Series Self-Cleaning Pipeline Magnets (e.g., RCYG-DN500)
• Key Benefits:
▫ Removes ≥99% of iron oxides & rust particles from sand streams in real-time.
▫ Eliminates concrete strength degradation caused by iron contamination (prevents up to 20% strength loss).
▫ High-capacity design (80 t/h), ideal for large-scale sand processing lines.
▫ Ensures consistent ASTM/C33 compliant sand quality.
III. Ferrous Metal Recovery from Recycled Aggregates (Waste Valorization)
• Equipment : CTQ Series Roller Magnetic Separators (e.g., CTQ-150×1000-III)
• Key Benefits:
▫ Recovers ≥95% of valuable ferrous metals (rebar, wire mesh, nails) from C&D waste.
▫ Produces high-purity scrap metal (≥98%) suitable for direct mill sales.
▫ Reduces solid waste disposal costs by 30%.
▫ Maximizes resource recovery from demolition materials.
IV. High-Purity Mineral Processing (e.g., Quartz Sand)
• Equipment : GTC Series High-Gradient Plate Magnetic Separators (e.g., GTC-18000)
• Key Benefits:
▫ Removes micron-sized iron impurities (reduction from 200ppm → ≤5ppm).
▫ Enables production of premium-grade silica sand (SiO₂ ≥99.5%) for high-strength concrete.
▫ Energy consumption reduced to 1/10 of traditional systems.
▫ Critical for specialty glass and industrial mineral applications.
Proven Case Studies
Zhejiang Aggregate Producer – Crusher Protection
• Challenge: Granite feed contaminated with iron slag, destroying 2 sets of crusher hammers monthly.
• Solution: Installation of HCG-1050×2100 Dry Drum Magnetic Separator (Document Ref: 6).
• Result:
▫ 99.2% tramp iron removal rate.
▫ Hammer lifespan increased from 15 → 45 days.
▫ Annual savings: ¥800,000 ($110,000 USD) in maintenance costs.
Shandong Ready-Mix Concrete Plant – Quality Compliance
• Challenge: 8% concrete strength failure rate due to iron oxide in manufactured sand.
• Solution: Integration of RCYG-500×300 Self-Cleaning Magnet on conveyor (Document Ref: 91).
• Result:
▫ Iron content reduced from 0.03% → 0.008%.
▫ 100% pass rate on 28-day compressive strength tests.
▫ ¥2,000,000 ($275,000 USD) annual savings in quality claims.