Product 04
Hydrated Lime
Hydrated lime is calcium hydroxide, a fine white alkaline powder. In water treatment it raises pH, helps protect pipework from corrosion and is used in softening and in neutralising acidic effluent.
- Form
- Fine white powder
- Grades
- Multiple, matched to application
- Documentation
- Available on request
- Packaging
- Confirmed with each quote
Quick answer
What is hydrated lime used for in water treatment?
Hydrated lime (calcium hydroxide) raises the pH of water, reduces its corrosiveness to pipes, softens water by precipitating hardness, and neutralises acidic effluent. It is usually dosed as a slurry or a saturated lime solution.
Product overview
Lime is typically prepared as a slurry or solution and dosed into the water or process stream. Raising the pH makes water less corrosive to pipes and fittings, and lime softening removes hardness by precipitating calcium and magnesium.
Beyond water, hydrated lime is used in process industries, including clarification of sugarcane juice in sugar manufacture and neutralisation of acidic process streams.
How hydrated lime is dosed
- 01
Prepare
Powder is mixed with water into a slurry or saturated lime solution.
- 02
Dose
The slurry is added to the water or process stream with good mixing.
- 03
React
pH rises. At softening doses, hardness precipitates.
- 04
Remove solids
Precipitated solids settle out or are filtered.
Key applications
pH correction
Raising the pH of treated water to the target range.
Corrosion control
Reducing the corrosiveness of water to pipes and distribution systems.
Lime softening
Precipitating hardness from water before filtration.
Effluent neutralisation
Neutralising acidic effluent and aiding precipitation of metals.
Hydrated lime or quicklime?
| Hydrated lime | Quicklime | |
|---|---|---|
| Chemistry | Calcium hydroxide, Ca(OH)₂ | Calcium oxide, CaO |
| Handling | Ready to slurry with water | Must be slaked first; reacts with water, releasing heat |
| Typical use | Smaller to medium dosing systems | Larger systems with slaking equipment |
Industries served
Available grades and specifications
Grades are selected for your application. Parameters commonly specified for hydrated lime include:
- Available lime (as Ca(OH)₂)
- Fineness
- Acid insoluble matter
- Moisture
Choosing a grade: what to tell us
- Starting and target pH
- pH correction, softening or neutralisation
- Dosing and mixing equipment
- Storage and dust handling
Technical specifications available on request.
Tell us your application and the specification you work to, and we will share details for suitable grades.
Packaging
Packaging depends on the grade and quantity and is confirmed with each quote. Let us know your preferred pack size and handling requirements when you enquire.
Technical information
Technical data sheets and supporting documentation for each grade are shared on request.
Frequently asked questions
What is hydrated lime used for in water treatment?
Mainly to raise pH, reduce corrosiveness, soften water by precipitating hardness, and neutralise acidic effluent.
How is hydrated lime dosed?
It is usually mixed with water into a slurry or saturated solution, then dosed into the stream with suitable mixing.
Is hydrated lime the same as quicklime?
No. Quicklime is calcium oxide. Hydrated lime is calcium hydroxide, made by reacting quicklime with water, and is easier to handle and dose.
Request product information
Share your application and requirement for hydrated lime. Our team will help you identify a suitable grade.
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