1000℃ Rotary Kiln for Silica Slurry Drying & Calcination – Multi-Zone Continuous Operation

Product Name

1000°C Large Multi-Zone 40m Rotary Kiln – GWDLTHERMO Silica Slurry Drying & Calcination Recovery System

Product Overview

The GWDLTHERMO 40m Multi-Zone Rotary Kiln is an integrated thermal processing system specifically engineered for silica slurry drying, calcination, and recovery in photovoltaic wafer manufacturing. During traditional silicon wafer cutting, significant amounts of industrial waste slurry are generated. This system removes moisture and combusts organic and inorganic impurities from the collected waste material, allowing valuable raw materials to be reused. The result is higher material utilization, increased production output, and reduced environmental impact.

Designed for continuous, high-volume, unmanned operation, the kiln combines drying, calcination, exhaust purification, and heat recovery into a single streamlined process. The entire system is controlled via a centralized PLC and touch-screen HMI, ensuring precise temperature control, process stability, and operational safety.

Technical Specifications

Parameter	Specification
Maximum Temperature	1000°C
Continuous Operating Temperature	900°C
Furnace Length	40m (multi-section structure)
Zones	5 drying zones + 5 calcination zones + 4 purification zones
Temperature Sensors	23 points (material temp, exhaust temp, outlet temp, heat recovery inlet temp, etc.)
Heating Elements	High-temperature alloy resistance wires with Mo content
Temperature Accuracy	±1°C (integrated circuit control, no overshoot)
Heating Rate	Adjustable: up to 30°C/min fast heating, down to 1°C/h slow heating
Drive System	ABB motors: drying feed motor 4 kW, rotation motor 11 kW; calcination feed motor 4 kW, rotation motor 11 kW
Cooling Section	Equipped with heat recovery inlet, outlet temperature monitoring, spray cooling, and water pressure detection
Air/Gas Control	Calcination section with 3 gas inlet solenoid valves, adjustable flow
Control System	PLC + Touchscreen HMI, Profinet & RS485 communication, PID regulation, multi-curve programming
Protection Features	Dual-loop control & protection: over-temp, over-voltage, phase loss, soft start, current feedback, interlock safety
Power Supply	3-phase 5-wire, 400 VAC, 50 Hz, main breaker 2500 A
Feed Method	Continuous screw feeding, adjustable tilt angle
Packaging	Industrial-grade, wooden crate export packaging

Key Features

Continuous High-Volume Processing

Integrated multi-stage process: drying → calcination → exhaust purification → cooling.
Continuous feeding and discharging system supports unmanned, 24/7 operation.
High-throughput capability for large-scale production lines.

Precision Multi-Zone Temperature Control

23 strategically placed sensors monitor material, exhaust, and outlet temperatures in real time.
Independent PID-controlled zones ensure uniform heating and accurate temperature profiles.
Adjustable heating rates to suit different material properties and process requirements.

Energy Recovery & Environmental Protection

Exhaust heat recovery system reduces energy consumption by recycling process heat.
Tail gas purification furnace achieves high VOC and particulate removal rates, minimizing emissions.
Spray cooling in the final section ensures safe handling temperatures (<50°C at discharge).

Robust Mechanical & Control Design

ABB variable-frequency drive motors for smooth feeding and rotation control.
Gas inlet valves with selectable flow rates for precise atmosphere control in calcination.
PLC + touch-screen operation with data logging, alarm display, and remote communication interface.

Reliability & Safety

Double-layer, air-cooled furnace shell keeps surface temperature ≤45°C.
Integrated fault detection and protection: over-temp, over-current, phase loss, and emergency stop.
Emergency manual control backup independent from CPU for critical safety assurance.

Applications

Photovoltaic industry – Silicon slurry drying & impurity removal
Ceramic industry – Large-volume drying & calcination
Non-metallic minerals – Controlled-atmosphere thermal treatment
Metallurgical processes – Powder pre-treatment before reduction or sintering

Our Commitment

At GWLTHERMO, we believe that industrial innovation should go hand in hand with environmental responsibility. For over 20 years, our dedicated R&D team has specialized in designing customized thermal processing solutions that not only meet high-performance demands but also align with global sustainability goals.
The GWDL-1000SSR rotary kiln embodies this vision—reducing waste, conserving energy, and enabling large-scale recycling in the silicon industry. By integrating precision engineering with green manufacturing principles, we help our clients achieve operational excellence while contributing to a cleaner, more sustainable future.