How is Quick Lime Powder Made?
Quick lime powder starts the same way as lump quick lime: natural limestone (calcium carbonate) is heated in kilns above 900°C, driving off carbon dioxide through a process called calcination:
CaCO₃ → CaO + CO₂
The resulting lumps are then crushed to a fine, controlled particle size (commonly around 150 mesh) and packed in airtight bags to protect the powder from moisture absorption during storage and transit. This milling and packaging step is what separates quick lime powder from raw lump lime — it's ready for direct dosing or blending without further size reduction at the point of use.
Key Properties of Quick Lime Powder
- Chemical formula: CaO
- Appearance: White or off-white fine powder
- Solubility: Reacts with water to form slaked lime, Ca(OH)₂
- Highly exothermic reaction: generates significant heat on contact with water
- Alkaline nature: acts as a strong base, effective at neutralizing acids
- Controlled particle size: finer milling increases surface area, which increases reactivity and speed of reaction compared to lumps
Typical composition range (varies by supplier and grade): CaO 80–90%, with magnesium oxide, silica, and moisture present in smaller controlled proportions depending on the limestone source and kiln process.
Industrial Applications of Quick Lime Powder
AAC Blocks
Quick lime powder is a key raw material in Autoclaved Aerated Concrete (AAC) block manufacturing. Its fine, consistent particle size supports uniform reaction during the aeration and curing process, which directly affects block density and strength.
Cement Production
Quick lime powder is a component in cement manufacturing, functioning as an affordable, readily available base alkali. A significant share of quick lime output industry-wide is also converted into hydrated lime for use in construction materials and for purifying drinking water.
Plastics Industry
The plastics industry uses quick lime powder as a filler and acid-scavenging additive in certain polymer formulations, where powder form allows uniform, consistent blending into the compound.
Steel & Chemical Processing (Flue-Gas Desulfurization)
In powder form, calcium oxide is used as a solid spray or in slurries for flue-gas desulfurization (FGD), removing sulfur dioxide from industrial exhaust gases before release.
Paper & Pulp
Quick lime powder is used in the regeneration of sodium hydroxide from sodium carbonate — a chemical-recovery process used in Kraft paper mills that reduces raw material costs.
Mining
Powdered and cartridge forms of quick lime take advantage of its exothermic reaction with water for controlled rock-fracturing: a sealed cartridge is inserted into a drilled hole, water is added, and the resulting expansion and heat break the rock apart. This method works best on softer rock types.
Water Treatment & Softening
Quick lime powder is used for water softening and in ammonia recovery within the Solvay process, as well as for general pH correction in water and wastewater treatment.
Agriculture
Powdered quick lime is applied to acidic soils for soil improvement, correcting pH and improving overall soil quality for crop production.
Other Applications
- Medicine & laboratory use — used in insecticide formulations and in food/feed processing for laboratory functions including gas absorption, precipitation, and dehydration
- Historical lighting — heated to roughly 2,400°C, quick lime produces an intense glow historically used as "limelight" in theatre productions before electric lighting existed
- Plaster & construction — used in lime-based mortars and plaster, a technique with archaeological evidence dating back to Pre-Pottery Neolithic construction
Quick Lime Powder vs. Lump Quick Lime
A common point of confusion: is "quick lime" and "quick lime powder" the same thing? Chemically, yes — both are calcium oxide (CaO). The difference is physical form and readiness for use:
| |
Lump Quick Lime |
Quick Lime Powder |
| Physical form |
Solid lumps, as produced from the kiln |
Crushed to a fine, controlled particle size |
| Processing needed before use |
May require crushing/grinding on-site |
Ready to dose or blend directly |
| Typical use case |
Steel flux, general industrial reactions, feedstock for further processing |
AAC blocks, plastics blending, and applications needing uniform particle size |
| Packaging |
Bulk lump form |
Airtight bags to prevent moisture pickup |
| Reactivity |
Slower initial reaction due to larger surface-to-volume ratio |
Faster reaction due to greater surface area |
If your process specifically needs lump form — for steel flux or as feedstock for on-site crushing — see our dedicated Quick Lime page.
Quick Lime Powder vs. Hydrated Lime Powder
Another frequent question: what's the difference between quick lime powder and hydrated lime powder? They are related but chemically distinct:
| |
Quick Lime Powder (CaO) |
Hydrated Lime Powder (Ca(OH)₂) |
| Production stage |
Pre-hydration; the direct calcination product |
Made by adding water to quick lime |
| Reactivity with water |
Highly exothermic, generates heat |
Already stabilized; reacts more gently |
| Handling |
Requires more caution due to heat generation |
Generally safer and easier to handle |
| Common applications |
AAC blocks, cement, plastics, FGD |
Water treatment, plaster, soil treatment, food processing (sugar clarification) |
For hydrated (post-water-reaction) lime powder, see our Hydrated Lime page.
Handling & Safety
Quick lime powder is highly reactive with moisture and should be handled with appropriate precautions:
- Wear protective gloves, eyewear, and a dust mask when handling
- Avoid inhaling airborne powder — fine particle size increases inhalation risk compared to lump form
- Store sealed bags in a dry, moisture-free environment
- Keep away from water sources, acids, and flammable materials until point of use
- In case of skin or eye contact, rinse thoroughly with water immediately and seek medical attention if irritation persists
Common Questions Buyers Have Before Sourcing Quick Lime Powder
- Is lump or powder form right for my process? If your application needs fast, uniform reaction (AAC blocks, plastics blending, FGD), powder is usually the better fit. If you're feeding a process that does its own size reduction, lump form may be more cost-efficient.
- What particle size do I actually need? Finer mesh reacts faster but may not be necessary — matching mesh size to your process avoids paying for unnecessary fineness.
- How should I store it? Powder degrades faster than lumps when exposed to moisture because of its larger surface area — airtight, dry storage matters more here than for lump lime.
- Is a sample worth requesting? Yes — reactivity and consistency vary by kiln batch, so a sample is a low-cost way to confirm fit before a bulk order.
Sourcing Quick Lime Powder from Shivi Minerals
Shivi Minerals is a quick lime powder manufacturer and supplier based in Jodhpur, Rajasthan. Our quick lime lumps are manufactured in-house and then crushed and packaged into powder, which gives us direct control over quality from calcination through to final milling — rather than sourcing lump lime from a third party for powdering.
Standard specification:
| Parameter |
Specification |
| Appearance |
White |
| Calcium Oxide (CaO) |
85% ± 2% |
| Magnesium Oxide (MgO) |
1.20% ± 0.50% |
| Silica |
1.25% ± 0.50% |
| Particle Size (Mesh) |
150 |
| Purity |
99% |
Custom mesh sizes and specifications are available on request. Powder is supplied in airtight bags to prevent moisture absorption, with bulk/jumbo bag options for larger orders.
Why buyers choose us:
- Vertically integrated production — from limestone calcination to finished, packaged powder
- Consistent specification across batches (85% ± 2% CaO, 150 mesh, 99% purity as standard)
- Moisture-protected packaging to preserve reactivity in transit and storage
- Single-source supply for AAC blocks, cement, plastics, steel, paper, and water treatment applications
(Note: MOQ, pricing, and delivery time specific to the powder product aren't published on your current live page — the lump Quick Lime page lists ₹4,000–6,000/ton and 20-ton MOQ, but that may not directly apply given the extra milling/packaging step. Send me the real figures and I'll add them here without guessing.)
Get a quote or request a sample: Contact us with your required specification and volume.
