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A Glimpse Of Quicklime: The Power Mineral You Should Know

quicklime is such a valuable material


Quicklime comes in a variety of grades, each tailored to specific applications. In this blog, we will take a closer look into the world of quicklime by exploring its fundamental properties, the wide range of industries it serves, and the different types that are available. We’ll also discuss why it is such a valuable material and the essential safety precautions to keep in mind when handling it.

What Is Quicklime?

Quicklime isn’t just another name for a chemical compound, it’s actually calcium oxide (CaO) in a form produced by a specific process—heating limestone to incredibly high temperatures in a specialized furnace called a kiln. This transformation results in a white or gray powder, sometimes called burnt lime, known for its caustic nature. At typical temperatures and pressure, quicklime takes the form of a white, crystalline solid.

However, this seemingly innocuous powder packs a punch: it’s quite caustic and alkaline under normal conditions.

Quicklime exhibits interesting structural properties
The form of a white, crystalline solid

In the world of chemicals, ‘lime’ typically describes compounds with calcium as a key ingredient. This kind of mineral stands out for being both readily available and cost-effective.  It has earned an important place as a commodity chemical, along with its close relative, calcium hydroxide.

The Process Of Manufacturing Quicklime

A single calcium oxide molecule consists of one calcium atom with a +2 charge (a cation) bonded to one oxygen atom with a -2 charge (an anion).

The production of quicklime begins with readily available natural resources like limestone or seashells. These materials, rich in calcium carbonate, are the key ingredients. The first step is to mine the limestone. Then, it undergoes a process called calcination, which involves heating it to extremely high temperatures in a specialized furnace.

This intense heat causes a chemical change, breaking down the calcium carbonate and releasing carbon dioxide gas. The end result of this transformation is quicklime (calcium oxide), a substance with unique properties compared to the original limestone.

To produce quicklime, limestone is first crushed and then subjected to extreme heat (around 1000°C or 1800°F) within large kilns. This intense heat triggers a process called calcination, which causes a chemical reaction. The limestone breaks down, releasing carbon dioxide gas and leaving behind quicklime, also known as calcium oxide (CaO).

After this initial stage, the quicklime is cooled and often undergoes further processing, such as crushing to various sizes or being hydrated (adding water) to form slaked lime (calcium hydroxide, Ca(OH)2).

Getting more information about another mineral – Dolomite

The Properties Of Quicklime

Quicklime isn’t average white powder. This highly stable compound, known for its amorphous (non-crystalline) structure, boasts an impressive melting point – a scorching 2600 degrees Celsius! This translates to an exceptional ability to withstand intense heat. But quicklime’s story doesn’t end there. When it encounters water, an interesting transformation occurs.

Quicklime reacts with water to form a new substance entirely: slaked lime.

Quicklime exhibits interesting structural properties. It crystallizes in a cubic lattice pattern, demonstrating an organized arrangement of atoms. In terms of thermodynamics, the molar entropy associated with quicklime is 40 joules per mole kelvin. Perhaps most fascinatingly, when heated to extreme temperatures (above 2400 degrees Celsius), quicklime emits a remarkably intense glow.

 quicklime can take on several appearances
The appealing color due to interesting structural properties

Under standard conditions, quicklime can take on several appearances, ranging from a pure white to shades of pale yellow or a light brown. This variation in color doesn’t come with a distinctive odor – quicklime is odorless.

This compound also has specific solubility properties: it demonstrates resistance to dissolving in methanol, octanol, and diethyl ether, which are commonly used solvents. These characteristics help to define some of the unique qualities of quicklime.

Health Hazards Associated With Quicklime

This mineral poses significant risks if handled improperly. It acts as an irritant to the eyes and skin, especially with prolonged exposure or inhalation of dust.  This danger stems from its inherent chemical properties:

  • Corrosive: it gradually damages concrete and metal. Prolonged contact can lead to serious structural weakening.
  • Fire Hazard: it mixed with flammable materials like wood chips or sawdust creates a dangerous situation. The dust can react and generate enough heat to cause ignition. Avoid the area and don’t breathe in any dust.

Because of the risks involved, it’s absolutely essential to wear full personal protective equipment (PPE) when working with quicklime. This includes goggles, a head hood, protective gloves (polyurethane or rubber), a cotton work suit, and leather boots.

In case of any contact with the eyes, it is advisable to thoroughly wash the eyes with generous amounts of water and to immediately seek medical help. It is unadvisable to inhale quicklime dust since it can cause irritation to the respiratory tract.

In case of  quicklime gets in your eyes, please follow this instruction:

  • Immediately flush your eyes with lots of water. Don’t stop until you’ve rinsed for a significant amount of time.
  • Get medical attention right away.
  • Avoid breathing in quicklime dust. It irritates your lungs and airways.

While we can not deny that it is a useful material, it’s essential to remember that it poses significant risks. Understanding these hazards, from its corrosive nature to potential health effects is the first step in responsible handling. Implementing proper safety controls is crucial for anyone working with this substance

The Usage In Wide Range Of Sectors

There is no doubt that quicklime has various applications, including construction, environment, agriculture, steel making, pulp and paper production, and chemical production. It is an important material in many industrial processes due to its chemical and physical properties, such as its high reactivity, high heat capacity, and low melting point. Below are common uses:

Construction aspect 

It can be used as a component in cement and mortar, and to produce lime plaster. It is said that it has been used for centuries as a binding agent in mortar and plaster. When mixed with water and sand, it forms a strong and durable material used in building walls, foundations, and decorative elements.

quicklime has a wide variety of uses
This mineral is applied for different applications

Environmental issue

It can be applied in wastewater treatment and flue gas desulfurization to remove impurities, specifically used to adjust pH levels, soften water, remove impurities, and reduce odors in water treatment facilities. Power plants and other industrial facilities also use this mineral to capture sulfur dioxide (SO2) emissions which can help to reduce air pollution.

Agriculture sector

Quicklime is utilized to modify soil acidity levels and enhance soil fertility. By increasing the pH of acidic soils, it creates a better setting for plant development and boosts the accessibility of nutrients. Additionally, it can serve as an organic pesticide or fungicide, safeguarding crops from potential harm.

Steel making

Quicklime takes a crucial role as a flux in the iron and steel production process. It is essential in the production of steel, helping to remove impurities from molten iron, resulting in a stronger, higher-quality product.

Pulp and paper production

Quicklime is involved in the production of pulp and paper by assisting in the removal of impurities. It is integral to the pulping process, which involves the breakdown of wood chips to extract essential cellulose fibers for paper manufacturing.

In Conclusion

We can conclude that quicklime has various grades and applications for certain industries or applications. However, it would be important for users to have the fundamental knowledge of this mineral.

By doing this, the user might be able to define the suitable grade for the end result of the product. One of the ways is to consult with the right chemical suppliers, distributors, or manufacturers. As quick lime has hazards, it is important to understand the handling of this material as it’s corrosive and flammable.


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