Overview
High-calcium quicklime, chemically known as calcium oxide (CaO), is a white or grayish-white solid produced by calcining limestone or other calcium-rich materials at high temperatures. It is highly reactive with water, releasing significant heat in an exothermic reaction to form calcium hydroxide (slaked lime). This compound is a cornerstone in various industrial processes due to its alkaline properties and versatility. High-calcium quicklime is distinguished from other forms of lime by its high calcium oxide content, typically exceeding 90%. It is widely used in construction, metallurgy, and chemical industries, where its reactivity and alkalinity are leveraged for applications ranging from steel production to water treatment.
Physical and Chemical Properties
High-calcium quicklime is characterized by its high melting point (2,572°C) and boiling point (2,850°C), making it stable under extreme conditions. It has a density of 3.34 g/cm³ and appears as a white or grayish-white solid, often in granular or powdered form. The compound reacts vigorously with water, producing calcium hydroxide and releasing heat, a property exploited in many industrial applications. Its solubility in water is limited, but it dissolves readily in acids and glycerol. The alkaline nature of CaO makes it useful for neutralizing acidic solutions. Quicklime is hygroscopic, meaning it absorbs moisture from the air, which can lead to carbonation over time if not stored properly. This reactivity necessitates careful handling and storage to maintain its efficacy.
Main Applications
In construction, high-calcium quicklime is a key ingredient in mortar and plaster, where it improves workability and durability. It is also used to stabilize soils and as a flux in metallurgy to remove impurities during steel production. The chemical industry relies on quicklime for producing calcium-based compounds, such as calcium carbide and bleaching powder. Water treatment facilities use quicklime to adjust pH levels and remove contaminants. In agriculture, it serves as a soil amendment to neutralize acidic soils and provide calcium nutrients. Additionally, quicklime is employed in waste treatment to reduce odors and sanitize organic waste, highlighting its broad utility across multiple sectors.
Safety and Storage
High-calcium quicklime is highly corrosive and can cause severe burns upon contact with skin or eyes. Inhalation of dust may irritate the respiratory tract. Proper personal protective equipment (PPE), including gloves, goggles, and respirators, is essential when handling this material. Work areas should be well-ventilated to prevent dust accumulation. Storage requires airtight, moisture-resistant containers to prevent hydration and carbonation. Quicklime should be kept in a cool, dry place away from incompatible materials like acids and organic compounds. Spills should be neutralized with water or weak acids, and contaminated areas must be cleaned promptly to avoid hazardous reactions.
B2B Procurement Guide
When procuring high-calcium quicklime, prioritize suppliers with a proven track record of quality and reliability. Verify the product's purity (typically 90-95% CaO) through certificates of analysis. Packaging should be robust and moisture-proof to ensure product integrity during transit and storage. Bulk purchases often offer cost advantages, but ensure storage facilities can maintain dry conditions. Evaluate delivery logistics to minimize exposure to humidity. For specialized applications, consider custom grades with specific particle sizes or reactivity levels. Always request safety data sheets (SDS) and handling guidelines to comply with regulatory requirements and ensure workplace safety.
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