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High-purity alumina calcination project in Abu Dhabi, UAE
Intelligent calcination system of Sino-Coke allows us to make a breakthrough in the Middle East high-end material market! Under the high temperature of 50℃ and dusty environment, the continuous operation rate of the equipment is over 99%, the product scorch reduction is ≤0.02%, and the sodium content is < 50ppm.
Customer feedback
The intelligent calcination system of ZOOMJO GROUP has enabled us to achieve a breakthrough in the Middle East high-end materials market! Under a high temperature of 50°C and a dusty environment, the equipment's continuous operation rate exceeds 99%, the product's ignition loss is ≤0.02%, and the sodium content is<50ppm>
- Dr. Ahmed Al-Maktoum, CTO of Emirates Advanced Materials, UAE
Production line configuration
| Equipment | Technical parameters |
|---|---|
| Intelligent flash dryer | Moisture content reduced from 15% to 0.5%, energy consumption ≤0.8kW·h/kg |
| Suspension preheater | Six-stage cyclone preheating, heat recovery efficiency ≥85% |
| Rotary calcining kiln | Multi-temperature zone precise control (200-1450℃±3℃) |
| Quick cooling unit | Nitrogen quenching rate ≥200℃/s, grain size D50=0.8μm |
process
Ultra-clean treatment of raw materials
Aluminum hydroxide is cleaned with nanobubbles to remove Na⁺, K⁺ plasma (residual amount<80ppm)>
Use supersonic airflow crushing pretreatment, D90 particle size ≤15μm
Step calcination control
Preheating decomposition section (200-800℃):
Remove crystal water, γ-Al₂O₃ conversion rate ≥95%
Integrated SCR denitrification system, NOx emission <50mg/m³
Crystal conversion section (1200-1450℃):
Precise temperature control in six temperature zones, α-Al₂O₃ conversion rate ≥99.5%
The kiln body adopts gradient composite refractory material, which prolongs its service life by 3 times
Ultra-fast cooling and shaping
High-temperature materials enter the quenching unit and cool from 1450℃ to 200℃ within 10 seconds
Nitrogen protection prevents the formation of β phase, and the grain size uniformity CV value is <5%
Intelligent sorting and packaging
Graded by LSS sorting system:：
0.5-1.0μm (electronic ceramic grade)
1.0-3.0μm (refractory grade)
Vacuum aluminum foil packaging, to prevent moisture absorption, moisture content for life <0.1%
Technological breakthrough
Desert adaptation:
The kiln head seal adopts a labyrinth structure of silicon carbide ceramics, which increases the resistance to sand and dust intrusion by 10 times.
Intelligent lubrication system maintains bearing temperature <75°C at 60°C ambient temperature
Digital Twin System:
Real-time mapping of the 30,000℃·h temperature integral curve in the kiln, with a crystal phase prediction accuracy of >98%
Blockchain technology enables grain growth traceability from raw materials to finished products
Zero Carbon Practices:
Waste heat driven MED desalination plant with 500 tons of fresh water per day for plant use
Calcined exhaust gas CO₂ capture for the production of green hydrogen, carbon reduction rate ≥ 40% of the carbon synthesis
