Agricultural Lime (Ag Lime)
Discover the benefits, specifications, and global supply advantages of high-quality agricultural lime from China for soil pH correction and crop improvement.
What is the difference between dolomite lime and hydrated lime?
Lime-based products are indispensable in agriculture, construction, and environmental management. However, dolomite lime and hydrated lime are often confused despite their distinct chemical compositions, reactivity, and applications. Misusing hydrated lime, for instance, can over-alkalize soil, while dolomite lime’s magnesium content makes it ideal for magnesium-deficient soils. This article breaks down their key differences and provides actionable guidance for choosing the right product. 1. What Is Dolomite Lime? Dolomite lime is a natural limestone rock composed primarily of calcium magnesium carbonate (CaMg(CO₃)₂). It is mined, crushed, and ground into powder for various uses. 🔹 Key Features: Contains both Ca and Mg: Ideal for soils deficient in magnesium Slow pH adjustment: Works gradually over time Safe to handle: Low causticity compared to hydrated lime ✅ Common Uses: Soil conditioning in agriculture pH adjustment in aquaculture and water treatment Environmental remediation (e.g., acid-neutralizing in mines) 2. What Is Hydrated Lime? Hydrated lime, also known as slaked lime, is chemically calcium hydroxide (Ca(OH)₂). It is made by adding water to quicklime (CaO), creating a highly alkaline, fast-acting material. 🔹 Key Features: Highly reactive: Rapid pH elevation and neutralization Strong alkalinity: Ideal for disinfection and chemical processes Fine powder texture: Easily dispersible in water ✅ Common Uses: Water and wastewater treatment Flue gas desulfurization in power plants Soil stabilization and asphalt modification Neutralization of acidic industrial waste 3. Chemical Composition Comparison Property Dolomite Lime Hydrated Lime Main Composition CaMg(CO₃)₂ Ca(OH)₂ Calcium Content (CaO) ~30–34% >70% Magnesium Content (MgO) ~18–22% 0% pH in Solution ~8.5–9.5 ~12.5 Solubility Low High 4. Reactivity & Handling Differences Hydrated lime is much more reactive and caustic. It can cause skin and eye irritation, and must be handled with PPE (Personal Protective Equipment). Dolomite lime is safe to apply manually, commonly used by farmers without industrial precautions. Storage: Hydrated lime requires airtight storage to prevent…
