Overview
Crushed lime, chemically known as calcium oxide (CaO), is produced by thermally decomposing limestone (calcium carbonate) in a kiln. It is a fundamental industrial material with widespread applications due to its reactivity and alkalinity. The crushed form is easier to handle and transport compared to powdered lime, making it a preferred choice for bulk applications. In construction, crushed lime is a key ingredient in mortar and plaster, providing binding properties and durability. In agriculture, it is used to neutralize acidic soils and improve crop yields. Its chemical reactivity also makes it valuable in water treatment and metallurgical processes.
Physical and Chemical Properties
Crushed lime is characterized by its high melting and boiling points, reflecting its stability at elevated temperatures. It is highly reactive with water, undergoing an exothermic reaction to form calcium hydroxide (slaked lime). This property makes it useful for drying agents and pH adjustment. The material is typically white or grayish-white, with a granular or powdery texture. Its density of 3.34 g/cm³ makes it heavier than water, and it is insoluble in organic solvents. Care must be taken during handling due to its corrosive nature and potential to cause thermal burns when reacting with moisture.
Main Applications
In construction, crushed lime is mixed with sand and water to create mortar or plaster, offering excellent adhesion and workability. It is also used in soil stabilization for road construction, where it improves the load-bearing capacity of weak soils. Agriculture relies on crushed lime to amend acidic soils, enhancing nutrient availability for plants. It is also used in animal feed to provide calcium. Industrially, crushed lime serves as a flux in steelmaking, a reagent in chemical synthesis, and a neutralizing agent in wastewater treatment.
Safety and Storage
Crushed lime poses several hazards, including skin and eye irritation, respiratory issues if inhaled, and thermal burns when reacting with water. Proper personal protective equipment (PPE) such as gloves, goggles, and masks should always be worn during handling. Storage requires a dry, well-ventilated environment to prevent moisture absorption, which can lead to caking or unintended reactions. Containers should be tightly sealed and labeled clearly. Avoid storing near acids or organic materials to prevent dangerous reactions.
B2B Procurement Guide
When procuring crushed lime, buyers should prioritize suppliers with certifications such as ISO 9001 to ensure quality consistency. Key specifications to verify include CaO content (typically ≥90%), particle size distribution, and impurity levels. Bulk purchases often offer cost savings, but consider logistics such as transportation and storage capacity. Negotiate contracts with clear terms on delivery schedules, packaging requirements, and quality assurance testing. Regional availability may influence pricing, so compare quotes from multiple suppliers.
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