Why Lime Is a Fundamental Material in Construction, Agriculture, and Industry
Technical Introduction
Lime is derived from limestone (CaCO₃) through calcination, resulting in quicklime (CaO).
When hydrated with water, it forms slaked lime (Ca(OH)₂).
Lime is widely used for soil improvement, water treatment, construction, and chemical manufacturing, thanks to its alkaline nature, binding properties, and reactivity.
Applications
1. Construction & Building Materials
Mortar and Plaster: Used as a binder for masonry and plastering.
Cement Additive: Improves workability and strength.
Soil Stabilization: Enhances bearing capacity for foundations and roads.
2. Agriculture & Horticulture
Soil Amendment: Neutralizes acidic soils and supplies calcium for plant growth.
Animal Feed: Source of calcium in feed formulations.
3. Industrial Uses
Water Treatment: Removes impurities and softens water.
Chemical Manufacturing: Used in production of calcium salts, soda ash, and paper.
Environmental Applications: Treats wastewater, flue gases, and industrial effluents.
Advantages
Alkaline Properties: Neutralizes acids and improves soil pH.
Versatile: Used in construction, agriculture, and industry.
Binding and Strengthening: Enhances mortar and soil structure.
Environmentally Friendly: Helps in pollution control and water treatment.
Typical Parameters
| Property | Value |
|---|---|
| Chemical Formula | CaO (quicklime), Ca(OH)₂ (slaked lime) |
| Appearance | White or off-white powder or lumps |
| Calcium Content (CaO) | ~90–95% (quicklime) |
| Solubility in Water | Reacts to form Ca(OH)₂ |
| pH (1% solution) | 12–13 |
| Bulk Density | 0.7–1.0 g/cm³ |
| Purity | ≥ 90% |
| Shelf Life | 1–2 years in dry, sealed storage |
FAQs
Q1: What is the difference between quicklime and slaked lime?
A1: Quicklime (CaO) reacts with water to form slaked lime (Ca(OH)₂), which is less reactive and safer to handle.
Q2: Can lime be used for soil improvement?
A2: Yes, it neutralizes acidic soils and provides calcium for crops.
Q3: How is lime used in water treatment?
A3: It removes hardness, neutralizes acidic water, and precipitates impurities.
Q4: Is lime safe for plants and animals?
A4: Yes, in recommended amounts; excessive application may raise pH too high.
Q5: How should lime be stored?
A5: Keep in dry, airtight, and ventilated conditions to prevent reaction with moisture and carbon dioxide.
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