Overview
Quicklime (calcium oxide, CaO) is a caustic alkaline substance produced by calcining limestone at high temperatures. In the food industry, it is prized for its ability to adjust pH, act as a drying agent, and serve as a disinfectant. Its reactivity with water makes it useful for processes requiring moisture control or heat generation. Food-grade quicklime must meet stringent purity standards to avoid contamination. It is commonly used in sugar refining, corn processing, and water treatment for beverages. Regulatory bodies like the FDA and EFSA approve its use within specified limits.
Physical and Chemical Properties
Quicklime appears as a white or grayish-white solid with a high melting point (2,572°C) and density (3.34 g/cm³). It reacts exothermically with water to form calcium hydroxide (slaked lime), releasing significant heat. This property is leveraged in food drying and sanitation. Its alkalinity (pH ~12.4) makes it effective for neutralizing acids or precipitating impurities. However, this also poses handling risks, as it can corrode organic tissues and metals. Storage requires airtight containers to prevent moisture absorption, which reduces efficacy.
Main Applications
In food processing, quicklime is primarily used to adjust pH during sugar extraction from beets or cane. It precipitates impurities, improving clarity and yield. Corn processors employ it to soften kernels for masa production via nixtamalization. As a drying agent, it controls humidity in storage facilities or packaging. Its disinfectant properties are utilized in sanitizing equipment and water treatment. Some traditional foods, like Chinese century eggs, also rely on its preservative effects.
Safety and Storage
Quicklime demands careful handling due to its corrosive nature. Direct contact causes severe burns, necessitating gloves, goggles, and respirators. Spills should be neutralized with weak acids (e.g., vinegar) and reported immediately. Store in cool, dry areas away from moisture and incompatible materials (e.g., acids, organic compounds). Food-grade batches must be segregated from industrial-grade products to prevent cross-contamination. Label containers clearly with hazard symbols.
B2B Procurement Guide
When sourcing quicklime for food applications, prioritize suppliers with ISO 22000 or FSSC 22000 certifications. Request Certificates of Analysis (CoA) confirming ≥95% CaO content and low heavy metal levels (e.g., <10 ppm lead). Opt for granular or powdered forms based on your process needs. Bulk purchases (e.g., 25-ton lots) typically offer cost savings but require proof of proper storage facilities. Negotiate contracts with delivery schedules to ensure freshness, as prolonged storage degrades quality.
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