A Lime Slaking Plant is an industrial facility designed to convert quicklime (calcium oxide, CaO) into hydrated lime (calcium hydroxide, Ca(OH)₂) through a controlled chemical reaction with water. This process, known as lime slaking, is critical for transforming highly reactive quicklime into a safer, more stable, and usable form for various industrial applications.
Key Process: Lime Slaking
1.Chemical Reaction:
CaO (quicklime)+H2O→Ca(OH)2(hydrated lime)+Heat
The reaction is highly exothermic, requiring precise control of water-to-lime ratios, temperature, and mixing to prevent overheating, steam explosions, or incomplete hydration.
2.Steps:
Mixing: Quicklime and water are combined in a slaking reactor (e.g., paste slaker, detention slaker, or ball mill slaker).
Hydration: Mechanical agitation ensures complete reaction, producing a lime slurry or powder.
Cooling: Excess heat is managed to avoid equipment damage or product degradation.
Screening: Removes unreacted impurities or oversized particles.
Applications
1.Water Treatment: Adjusts pH, softens water, and removes heavy metals.
2.Mining & Metallurgy: Used in mineral flotation, tailings neutralization, and as a flux in smelting.
3.Chemical Industry: Produces bleaching powder, calcium carbonate, and other compounds.
4.Construction: Manufactures mortars, plasters, and soil stabilizers.
5.Environmental Protection:Flue Gas Desulfurization (FGD): Neutralizes sulfur dioxide (SO₂) in emissions.
6.Soil Remediation: Treats acidic or contaminated soils.
7.Pulp & Paper: Used in the Kraft process for paper production.
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The qualified lumpy lime is firstly crushed into the sizes about 40mm by the Jaw crusher. Then the crushed sizes will be sent into the buffer silo by bucket elevator. Under the bottom of the storage silo, there is steady flow conveyor quantitatively weighing system. After weighing, the lime is sent into the primary slaking machine, and then enter into the secondary and / or third slaking machine, to make the lime completely slaked to get the quality primary products. The slaking rate can reach to 98%. The slaked lime is sent into the powder classifier by the semi- products screw conveyor for separation of the impurities and fine powder. After classifying, the quality final products is sent into the final storage silo by final-products screw conveyor and bucket elevator for packing or bulk loading. Hydrated lime is an ideal product for environmental protection in coatings, power plant desulfurization, water purification and mediation for water PH value.
| capacity (t/h) | 3 | 6 | 8 | 10 | 12 | 15 | 20 |
| Main equipment | Main supporting equipment model and technical & economic index | ||||||
| Slaker model | ZKX-3 | ZKX-6 | ZKX-8 | ZKX-10 | ZKX-12 | ZKX-15 | ZKX-20 |
| Power/kW | 7.5+7.5 | 11+11 | 7.5*2+11 | 7.5*2+11*2 | 7.5*2+11*2 | 11*2+11*2+11*2 | 11*2+11*2+11*2 |
| Stages of slaker | 1 | 2 | 2 | 3 | 3 | 3 | 3 |
| Slaking time/min | 50 | 50 | 55 | 55 | 55 | 60 | 45 |
| Dedusting air volume/m³/h | 4500 | 9000 | 12000 | 15000 | 18000 | 22500 | 30000 |
| Dedusting negative pressure/Pa | 500 | 1000 | 1000 | 1500 | 1500 | 1500 | 1500 |
| Bag filter model | ZM80 | PPC32-4 | PPC32-6 | PPC64-4 | PPC64-5 | PPC64-6 | PPC64-7 |
| I.D. Fan Power /kW | 7.5 | 15 | 15 | 30 | 45 | 75 | 75 |
| Separator model | NHX-500 | NHX-600 | NHX-600 | NHX-700 | NHX-700 | NHX-800 | NHX-800 |
| Separator power/kW | 7.5 | 11 | 11 | 15 | 15 | 18.5 | 18.5 |
