Quicklime Lump

Updated: 2026-08-20

Overview

Quicklime Lump, or calcium oxide (CaO), is a fundamental chemical compound produced by heating limestone (calcium carbonate) to high temperatures in a process called calcination. It is widely used across multiple industries due to its reactivity and alkaline properties. Quicklime is typically available in lump form, which is easier to handle and store compared to powdered forms. Its primary use lies in construction, where it serves as a key ingredient in cement and mortar. Additionally, it plays a critical role in metallurgy, water treatment, and chemical manufacturing.

Physical and Chemical Properties

Quicklime Lump is a white to grayish-white solid with a high melting point of 2,572°C and a boiling point of 2,850°C. Its density is approximately 3.34 g/cm³, making it a relatively dense material. One of its most notable chemical properties is its exothermic reaction with water, producing calcium hydroxide (slaked lime) and releasing significant heat. This reaction is highly useful in industrial processes but requires careful handling to avoid accidents. Quicklime is also alkaline, with a pH of around 12.4 when dissolved in water.

Main Applications

Quicklime Lump is indispensable in the construction industry, where it is used to produce cement, mortar, and plaster. Its ability to stabilize soil and improve load-bearing capacity makes it valuable for road construction. In metallurgy, it acts as a flux to remove impurities during steel production. Water treatment plants use quicklime to adjust pH levels and soften water by precipitating dissolved minerals. It is also employed in chemical manufacturing, particularly in producing calcium-based compounds and neutralizing acidic waste.

Safety and Storage

Quicklime Lump is highly reactive with moisture, necessitating strict storage conditions. It should be kept in a dry, cool, and well-ventilated area, preferably in sealed containers or moisture-proof bags. Handling requires personal protective equipment (PPE), including gloves, goggles, and respiratory masks, to prevent burns and inhalation of dust. In case of contact with skin or eyes, immediate rinsing with water is critical, followed by medical attention. Proper disposal methods must be followed to avoid environmental contamination.

B2B Procurement Guide

When procuring Quicklime Lump, buyers should prioritize purity levels, typically ranging from 90% to 95%. Packaging options include bulk shipments for large-scale industrial use or bags for smaller quantities. Supplier reliability is crucial; verify certifications and industry reputation. Pricing varies based on market demand, purity, and transportation costs, with an approximate range of $50-$150 per metric ton. Consider logistical factors such as storage facilities and handling equipment to ensure safe and efficient use.