Overview
Calcium peroxide (CaO₂) is a solid inorganic peroxide that decomposes to release oxygen upon contact with water. It is valued for its controlled oxidative properties and environmental compatibility. Industrially, it is synthesized by reacting calcium salts with hydrogen peroxide. As a stable oxygen source, it finds niche applications where gradual oxygen release is required, such as in wastewater treatment or soil remediation. Its non-toxic profile makes it suitable for agricultural and aquaculture use, distinguishing it from harsher oxidizing agents.
Physical and Chemical Properties
Calcium peroxide appears as a white or yellowish powder with a density of 2.9 g/cm³. It decomposes at around 200°C, releasing oxygen without boiling. The compound is only slightly soluble in water but reacts to form calcium hydroxide and oxygen. Key chemical properties include its role as a moderate oxidizer and its stability in dry conditions. Unlike hydrogen peroxide, CaO₂ offers prolonged oxygen release, making it ideal for applications requiring sustained action, such as groundwater remediation or seed coating.
Main Applications
In water treatment, calcium peroxide oxidizes contaminants like sulfides and enhances aerobic microbial activity. It is also used to oxygenate ponds in aquaculture and to mitigate root hypoxia in agriculture. The compound serves as a bleaching agent in toothpaste and food packaging. Industrial applications include use in drilling fluids and as a hardening accelerator in cement. Its versatility stems from its balance of reactivity and safety.
Safety and Storage
Calcium peroxide must be stored away from moisture and organic materials to prevent premature decomposition or combustion. Use gloves and goggles when handling, as dust may irritate skin and eyes. In case of fire, use dry sand or Class D extinguishers—water can exacerbate reactions. Spills should be contained and cleaned with inert absorbents. Always follow SDS guidelines for workplace safety.
B2B Procurement Guide
Buyers should prioritize suppliers with ISO certifications to ensure quality consistency. Key specifications include active oxygen content (typically 16–22%) and particle size (fine powders for faster reaction). Bulk purchases (tonnage) often reduce costs by 10–20%. Request samples to test compatibility with end-use processes. Consider logistics: moisture-proof packaging (e.g., PE-lined bags) is critical to prevent degradation during transit.