Quick lime, also known as calcium oxide (CaO), burnt lime, or unslaked lime, is an essential industrial chemical produced by calcining high-purity limestone at elevated temperatures. During this process, calcium carbonate decomposes into calcium oxide with the release of carbon dioxide. Depending on application requirements, quicklime may subsequently be hydrated to produce calcium hydroxide. Commercial lime may also contain small quantities of magnesium oxide, silica, aluminum oxide, and iron oxide originating from the raw limestone.
Limestone, composed primarily of calcium carbonate, is one of the world's most abundant mineral resources and has supported construction and industrial development for centuries. Historical records show that lime mortar and plaster were widely used by the Greeks, Romans, Etruscans, Arabs, and Moors, while the Roman architect Vitruvius documented some of the earliest technical specifications for lime.
Today, quicklime is widely used in steelmaking, metallurgy, glass manufacturing, cement and mortar production, pulp and paper, chemical manufacturing, wastewater treatment, air pollution control, agriculture, sugar refining, refractory applications, calcium carbide production, and numerous environmental processes. In construction, it improves the workability and durability of mortars and plasters, while in agriculture it helps neutralize acidic soils and supplies essential calcium.
The manufacturing process generally includes limestone extraction, raw material preparation, fuel preparation, calcination, quicklime processing, hydration or slaking where required, and storage and transportation. According to the report, the global lime market was valued at USD 46.68 billion in 2025 and is projected to reach USD 56.64 billion by 2034, driven by continued demand from construction, metallurgy, chemical processing, and environmental applications, particularly for wastewater treatment and emission control.
| Particular | Value |
|---|---|
| Plant Capacity | 835 Tons/Day |
| Land & Building ( 8 Hectare) | US$. 10120000.00 |
| Plant & Machinery | US$. 6436183.00 |
| Working Capital for 1 Month | US$. 1960338.00 |
| Total Capital Investment | US$. 19028701.00 |
| Rate of Return | 15% |
| Break Even Point | 76% |
Quick lime is calcium oxide produced by heating limestone at high temperatures. The manufacturing process involves calcining calcium carbonate until carbon dioxide is released, leaving calcium oxide as the primary product. Depending on the intended application, the quicklime may be further processed into hydrated lime by reacting it with water.
Quick lime is used across numerous industries. It serves as a flux in steelmaking, supports cement and mortar production, is used in glass and paper manufacturing, wastewater treatment, flue gas desulfurization, agriculture, sugar refining, refractory applications, calcium carbide production, and chemical processing because of its highly alkaline and reactive properties.
High-quality limestone is essential because it directly influences the purity of the finished quicklime. Limestone with a high calcium carbonate content generally produces better quality lime, while impurities such as magnesium, silica, aluminum, and iron compounds can affect product characteristics and suitability for different industrial applications.
Quick lime is widely used in environmental protection. It helps neutralize acidic wastewater, remove phosphates, capture sulfur oxides from industrial emissions, and precipitate heavy metal contaminants. These properties make it an important material for wastewater treatment plants and air pollution control systems.
The process begins with limestone extraction and preparation, followed by fuel preparation, calcination in a lime kiln, quicklime processing, optional hydration or slaking, and finally storage, handling, and transportation. Careful process control helps ensure consistent product quality and efficient plant operation.
Quick lime plays a vital role in both sectors. In construction, it improves the workability and durability of mortars, plasters, and other building materials. In agriculture, it neutralizes acidic soils, supplies calcium, improves nutrient availability, and supports healthier crop growth and long-term soil productivity.
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