What is hydrated lime used for?

Hydrated lime, also known as calcium hydroxide (Ca(OH)2), is a versatile chemical compound with various applications across different industries. Here are some common uses of hydrated lime:

Water Treatment

Hydrated lime is widely used in water and wastewater treatment processes. It is added to water to adjust pH levels, reduce acidity, and control the formation of odors and harmful bacteria. It can also aid in the removal of impurities, such as heavy metals, in water treatment plants.

Soil Stabilization

Hydrated lime is used in soil stabilization projects to improve the properties of soil. It can be added to clay or expansive soils to increase their load-bearing capacity, reduce swelling, and improve compaction. This application is commonly employed in road construction, building foundations, and land reclamation projects.

hydrated lime


Hydrated lime finds applications in the construction industry. It is used in mortar and plaster formulations to enhance workability, increase bonding strength, and improve the durability of masonry. Hydrated lime can also be used as a filler material in asphalt mixes for road construction.

Environmental Remediation

In environmental remediation projects, hydrated lime is utilized to treat contaminated soil or sludge. It can immobilize heavy metals, neutralize acidic soil or waste, and facilitate the stabilization and solidification of hazardous materials.

Industrial Processes

Hydrated lime is employed in various industrial processes. It is used in the production of paper, pulp, and chemicals. It can act as a pH regulator, buffering agent, or precipitating agent in chemical reactions. Hydrated lime is also utilized in sugar refining, steel manufacturing, and leather tanning processes.

hydrated lime

Flue Gas Desulfurization (FGD)

Hydrated lime plays a crucial role in flue gas desulfurization systems used to control sulfur dioxide emissions from power plants and industrial boilers. It reacts with sulfur dioxide to produce calcium sulfite and calcium sulfate, effectively reducing harmful emissions.


In agriculture, hydrated lime is used to adjust soil pH and improve soil fertility. It can neutralize acidic soils, allowing for optimal plant growth and nutrient availability. Additionally, hydrated lime is used to treat livestock waste by reducing odors and killing harmful bacteria.

Food Industry

Hydrated lime has limited applications in the food industry. It is used in the production of pickles, where it helps maintain the desired acidity levels and improve the preservation process.

It’s important to note that while hydrated lime has numerous applications, proper handling and usage are essential due to its caustic nature. Safety precautions should be followed, and manufacturers’ guidelines should be adhered to when utilizing hydrated lime in various applications.