Self-triggering reaction kinetics between nitrates and aluminium powder

Area of Science:

• Chemical Engineering
• Materials Science
• Accident Investigation

Background:

• A significant explosion occurred at the Panzera Company, a fireworks manufacturer, on September 19-20, 2003.
• The incident destroyed laboratories and involved approximately 120 kg of finished pyrotechnical product.

Purpose of the Study:

• To investigate the dynamics and causes of the Panzera Company fireworks explosion.
• To identify the specific reaction pathways leading to the accidental detonation.

Main Methods:

• Differential Scanning Calorimetry (DSC) was employed to analyze the raw materials of the exploded pyrotechnical mixture.
• Thermodynamic and kinetic analysis of the pyrotechnical composition was performed.

Main Results:

• A slow exothermic reaction was identified as the precursor to the explosion.
• The exothermic reaction, occurring over approximately 8 hours, led to the self-triggering of the pyrotechnical mixture.
• The event was characterized as a runaway reaction in the solid phase.

Conclusions:

• The detonation resulted from a solid-phase runaway reaction initiated by a slow exothermic process.
• The accident's root causes were linked to a craftsman-type production system lacking rigorous safety management controls.
• Non-conformance with safety management systems for major risk plants was a critical factor.