Aluminum dross (especially secondary aluminum dross), due to its content of aluminum nitride (AlN), soluble fluorides, and fine particulate dust, poses environmental risks such as ammonia gas release upon contact with water, water pollution, and dust emissions. Therefore, the harmless and resource-efficient disposal of cold aluminum dross (i.e., original aluminum dross that has not undergone high-temperature treatment or low-temperature aluminum slag produced during recycled aluminum production) has become an industry necessity.

Below is an introduction to XKJ Group's advanced aluminum dross hazardous waste resource utilization plant:

I. Process Route: Cold Method + Hot Method Coupling

A combined process of "mechanical separation (cold method) + high-temperature detoxification/smelting (hot method)" is used to achieve metal aluminum recovery and harmless treatment of the residue.

II. Core Processes and Equipment Composition

1. Enclosed Feeding and Pre-treatment
Cold aluminum dross is transported by forklift into a fully enclosed silo and then conveyed to the ball mill system via belt or pneumatic conveying. Negative pressure dust control is maintained throughout the process to prevent ammonia gas leakage and dust emissions.

2. Primary Ball Milling and Dissociation
A high-efficiency aluminum dross ball mill is used, utilizing steel balls for impact grinding to fully dissociate the metal aluminum from oxides and salts.

3. Rotary Drum Screening
The ball-milled material enters a sealed rotary drum screen, separating out large-particle metal aluminum (aluminum content ≥70%), which is directly recycled or sent to a dross processing machine for ingot casting.

4. Secondary Fine Grinding and Linear Screening
The fine material enters an ultra-fine ball mill, combined with a linear vibrating screen (double-layer screen), to further separate out granular aluminum, fine aluminum powder, and waste dross.

5. Metal Aluminum Recovery
The enriched aluminum particles are sent to a dross processing machine or inclined rotary furnace, where they are melted into liquid aluminum at 600–800℃ and cast into recycled aluminum ingots, achieving a recovery rate of over 85%.

6. Harmless Treatment of Secondary Aluminum Dross
The remaining waste dross (containing AlN) is sent to a rotary kiln calcination system (1100–1400℃) to completely decompose the aluminum nitride and eliminate the risk of ammonia gas release; the exhaust gas undergoes multi-stage purification using "cyclone + bag filter + alkali solution spraying" before meeting emission standards. 7. Tailings Resource Utilization

The detoxified tailings can be used as cement admixtures, roadbed materials, or for the preparation of refractory aggregates, achieving "zero landfill."

III. Technical Advantages

- Fully automated PLC control throughout the process, enclosed operation, and environmentally compliant;
- High-efficiency recovery of metallic aluminum, significantly reducing hazardous waste disposal costs;
- Harmless treatment of tailings;
- Modular design, customizable daily processing capacity (commonly 10–150 tons/day).

IV. Technical Parameters

Aluminum ash ball milling and screening equipment：

Rotary kiln ash processing equipment：