Calcium Hydroxide Industrial Uses

Introduction to Calcium Hydroxide (Ca(OH)₂)

Calcium hydroxide, also known as slaked lime or hydrated lime, is a white, alkaline powder with the chemical formula Ca(OH)₂. It is produced by mixing Calcium Oxide (quicklime) with water in a process called slaking.

Key properties of calcium hydroxide include:

· High alkalinity (pH ~12.4) – Effective for neutralization reactions

· Low solubility in water (~1.73 g/L at 20°C) – Forms suspensions rather than clear solutions

· Reactivity with acids and CO₂ – Used in chemical processes like flue gas treatment

· Affordable and widely available – Cost-effective for industrial applications

Due to these characteristics, calcium hydroxide is used across multiple industries, from water treatment to construction, agriculture, and food processing. Below, we explore its 10 most important industrial applications.

10 Key Industrial Uses of Calcium Hydroxide

1. Water & Wastewater Treatment

· Neutralizes acidic wastewater (e.g., from mining or metal processing)

· Precipitates heavy metals (Pb²⁺, Cu²⁺, Zn²⁺) as insoluble hydroxides

· Removes phosphates & fluorides to meet environmental regulations

2. Flue Gas Desulfurization (FGD)

· Used in coal-fired power plants to scrub SO₂ emissions

· Chemical reaction: Ca(OH)₂ + SO₂ → CaSO₃ + H₂O

3. Construction & Mortar Production

· Key ingredient in lime mortar for improved workability and durability

· Used in soil stabilization for road construction

4. Agriculture & Soil Conditioning

· Raises soil pH in acidic farmland

· Essential in Bordeaux mixture (fungicide for crops)

5. Sugar Refining

· Neutralizes organic acids in sugarcane juice

· Helps clarify sugar syrup before crystallization

6. Food Industry (Food-Grade Ca(OH)₂)

· Used in corn processing (nixtamalization) for tortillas

· Acts as a pickling agent and firming agent in vegetables

· Used in konjac food production as a gelling and setting agent.

7. Leather Tanning

· Removes hair and fats from animal hides during processing

8. Chemical Manufacturing

· Production of bleaching powder (Ca(ClO)₂)

· Used in ammonia synthesis and calcium-based chemicals

9. Petroleum Industry

· Neutralizes acidic components in oil refining

10. Steel & Metallurgy

· Treats acidic wastewater from metal pickling processes

Conclusion

Calcium hydroxide is a versatile and cost-effective chemical with critical roles in environmental protection, construction, food processing, and industrial manufacturing. Its ability to neutralize acids, precipitate metals, and improve material properties makes it indispensable across multiple sectors.

Looking for high-quality calcium hydroxide?
→Contact us or request a technical datasheet for industrial or food-grade options.