Roasting is a thermal treatment process in which materials are heated to high temperatures – below their melting point – under controlled conditions.
It is used for drying, decontamination, calcination, and decarbonization to modify the physicochemical properties of the raw material, such as porosity, reactivity, or mineral composition. The process can be carried out in various atmospheres—from air, through protective atmospheres, to oxygen-free conditions—depending on the desired final effect.
Most Common Equipment Used in Roasting
Roasting is typically performed in tunnel kilns and rotary kilns, which ensure uniform heating of the feed and precise control over key parameters: temperature, residence time in the heating zone, and atmosphere composition. An essential part of the process is the system for recovery and purification of exhaust gases, which improves safety and reduces environmental impact.
Key Benefits of Modern Roasting Systems
Stabilization and activation of raw materials
- (e.g., clays, bauxites, catalysts, sorbents), removal of moisture, volatile contaminants, and organic substances.
Improved physicochemical properties
- Such as increased specific surface area or enhanced reactivity.
Enhanced performance in downstream processes
- Such as milling, sintering, or mixing.
High versatility
- Used across the chemical, metallurgical, ceramic industries, and in waste management.
Equipment Useful in the Roasting Process
Coolers
for lowering the temperature of bulk materials after thermal processes.
Mechanical conveyors
for internal transport processes in manufacturing and logistics companies.
Industrial filters
for thorough purification of gases from dust and fine solid particles.
Industrial furnaces
for precise and effective thermal processing of loose materials and granulates.
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