Maximize Aluminum Recovery from Dross & Scrap, with Safe Dust Control & Environmental Compliance Specialized ball mill technology for aluminum dross, aluminum slag, salt cake, zinc dross, copper slag, and other non-ferrous metal waste recycling. From primary dross to secondary dross residue, our system enables high metal recovery, inert gas safety protection, and zero-waste processing — trusted by secondary aluminum smelters and metal recyclers worldwide.
Our aluminum dross ball mill is an enclosed horizontal grinding system specifically engineered for recovering metals from industrial waste and residues. With inert gas protection and dustless operation, it serves secondary aluminum smelters, zinc recyclers, and copper slag processors.
Materials & Process Flexibility
Our dross ball mill handles a broad range of metal-bearing wastes and process conditions:
Core Waste Materials:
· Primary aluminum dross (white dross, 15-70% metallic Al) — direct from smelting and holding furnaces
· Secondary aluminum dross (black dross, 5-20% metallic Al) — after salt flux treatment
· Salt cake / salt slag — from rotary salt furnace processing
· Aluminum scrap and turnings (contaminated, oxidized) — machining chips, UBC scrap
· Zinc dross and zinc ash — from galvanizing baths and die-casting
· Copper slag and dross — from copper smelting and refining
· Lead dross and skimmings — from lead battery recycling and smelting
· Brass and bronze dross — from alloying operations
· Magnesium dross — from magnesium alloy production
· Other non-ferrous metal skimmings and residues
Processing Targets:
· Metallic aluminum recovery rate: 85-92% from white dross, 55-70% from black dross
· Final residue: Inert aluminum oxide powder, suitable for steelmaking slag conditioner or cement additive
· Dust emission: <10 mg/Nm³ after baghouse filtration
From Hazardous Dross to Valuable Metal: Engineered Safety in Every Step
Controlled Dross Feeding & Pre-Crushing – Aluminum dross skulls are pre-crushed to <50mm by a sealed jaw crusher or hammer mill. The crushed dross is fed into the ball mill via an airlock rotary valve under nitrogen purge, preventing air ingress.
Selective Grinding in Ball Mill – The ball mill chamber uses specifically sized grinding media to selectively grind the brittle oxide/salt matrix while preserving the ductile aluminum metal particles. For salt cake, controlled water is introduced to dissolve salts and protect aluminum from oxidation.
Inert Classification & Screening – Ground material passes to a rotary screen or vibrating sieve under inert gas or ventilation hood. Large metallic aluminum flakes (1-5mm) are separated as high-grade concentrate. Medium particles return to the mill for further liberation.
Fine Dust Collection & Passivation – Fine dust (mostly Al₂O₃ and salts) is conveyed to a baghouse filter. For safety, the dust is either water-passivated immediately or collected under strict O₂-controlled conditions. Explosion isolation valves protect all ducting.
Metal Concentrate & Residue Handling – Recovered aluminum concentrate (>95% metallic Al) is pressed into briquettes or melted. The inert residue (Al₂O₃-rich powder) is stored in sealed silos for sale to steel or cement industries, achieving zero waste.
| Model | Dia.×Length (m) | Dross Capacity (t/h) | Motor Power (kW) | Shell Speed (r/min) |
|---|---|---|---|---|
| Φ1.5×5.7m | 1.5×5.7 | 2–5 | 90 | 29.7 |
| Φ1.8×7m | 1.8×7 | 5–10 | 185 | 25.4 |
| Φ2.2×7m | 2.2×7 | 10–15 | 245 | 24.5 |
| Φ2.4×8m | 2.4×8 | 15–22 | 315 | 22.4 |
| Φ2.6×9m | 2.6×9 | 20–30 | 400 | 21.5 |
Capacity based on primary aluminum dross (50% metallic content). Customizable for specific dross types.
| Parameter | Value |
|---|---|
| Feed material | Pre-crushed dross/scrap (max lump size ≤50mm) |
| Target product | Metallic aluminum concentrate 1-5mm, -200 mesh inert powder |
| Metal recovery rate | 85-92% (white dross), 55-70% (black dross) |
| Grinding atmosphere | Nitrogen/Argon inerting or controlled air with water passivation |
| Grinding method | Dry (inert gas) / Wet / Semi-dry |
| Circuit type | Closed-loop with screening and dust collection |
| Number of chambers | 1 or 2 |
| Liner material | High manganese steel / Ni-hard (for abrasive dross) |
| Grinding media | Forged steel balls (special diameter ratio for selective grinding) |
| Safety features | Explosion vent panels, O₂ monitoring, N₂ purge, isolation valves |
| Dust emission | <10 mg/Nm³ (baghouse) |
Complete Process Line Offerings
We provide turnkey aluminum dross processing plants including: dross cooling/skimmings pre-treatment, jaw crusher, ball mill with N₂ system, screening & separation unit, baghouse filter, water passivation system, and PLC control. As an experienced ball mill and dross recycling equipment manufacturer, we also supply optional salt recovery circuits to produce flux salts for reuse.
For Engineers & Procurement:
For white dross with >30% metallic Al, dry grinding under N₂ with screening is the most economical and safe configuration. For salt cake or black dross, a wet grinding circuit with water dissolution and salt brine recovery adds value by recycling NaCl/KCl fluxes. We will help you select the optimal process based on your dross composition and local environmental regulations.
Tell us your dross type, daily volume, and target metal recovery rate. We will engineer a tailored ball mill solution for your recycling plant.
Proven Performance: Global Dross Recycling Field Results
Case 1: 30,000 TPY Primary Aluminum Dross Processing Plant, Middle East
· Model: Φ2.4×8m Dry Ball Mill with N₂ Inerting & Screening
· Feed: Primary white dross (45-60% metallic Al) from a large aluminum smelter
· Product: Aluminum concentrate (1-5mm, >96% metallic Al), inert Al₂O₃ powder for cement
· Result: Metallic aluminum recovery 91.5%, processing cost <$15/ton, zero dust emissions. Recovered aluminum value exceeded operating costs by 3.5x. The plant achieved payback in 18 months.
Case 2: Salt Cake Recycling System, Europe
· Model: Φ1.8×7m Wet Ball Mill with Salt Dissolution Circuit
· Feed: Salt cake/slag from secondary aluminum refinery
· Product: Recovered aluminum granules (85%+ recovery), recycled NaCl/KCl brine for flux reuse, inert residue
· Result: Reduced hazardous waste landfill volume by 85%. Recovered and reused over 2,000 tons of flux salts annually, saving $300,000+ in raw material costs.
Case 3: Zinc Dross & Skimmings Grinding Plant, South Asia
· Model: Φ1.5×5.7m Dry Ball Mill with Dustless System
· Feed: Zinc dross and ash from galvanizing plant (65-80% metallic Zn content)
· Product: Zinc powder and zinc concentrate for resmelting
· Result: Achieved 95%+ zinc recovery, replacing a manual hammering operation. Worker exposure to zinc oxide dust eliminated. Output tripled.
Safety & Quality Built into Dross Processing: Beyond ISO 9001
· ATEX-Compliant Safety: Our inert gas ball mill systems are designed to meet ATEX 2014/34/EU and NFPA 484 for combustible metals. Every system includes certified explosion vent panels, O₂ analyzers with automatic shutdown, and a HAZOP report.
· Pre-Delivery Dry Run & Leak Test: Each mill is test-assembled and undergoes a nitrogen pressure test and safety logic verification before shipment.
· Process Guarantee for Metal Recovery: We contractually guarantee the metallic aluminum recovery rate for your specific dross, based on our pilot testing. If targets aren't met, we provide corrective engineering until it is.
· Environmental Compliance Support: We provide documentation for stack emission tests and residue leachability (TCLP) to help you meet local EPA or EU environmental permits.
· Long-Term Spare Parts Supply: Guaranteed supply of grinding media, liners, and screen meshes for the life of the plant. Technical support available 24/7.
Ready to Turn Your Dross from Cost to Profit?
Send an inquiry. You will receive:
A detailed quotation matching your dross type, daily volume, and target metal recovery.
A complete process flow diagram and equipment list for your dross recycling plant.
Reference cases from similar dross processing projects.
Your dross analysis data and business details are fully confidential.
Kolev Equipment Technology Co., Ltd. is a large-scale private technology enterprise specializing in the research, development, production, and sales of mining and metal ore processing equipment. With over 20 years of experience in ultra-fine grinding, industrial drying, and crushing sand making industries, we provide intelligent solutions and mature supporting products worldwide.
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