Function:
Filtration aid
Milk-of-lime dosing plant
Configuration:
Standard, monolithic, compact
Storage:
1–120 m³
The Tecnoidea milk-of-lime preparation and dosing plant is a key unit for chemical sludge conditioning. Where the characteristics of the material prevent effective dewatering, dosing lime chemically destabilises the clay structure and helps release the bound water retained within it. It plays a key role in environmental treatment, where incoming materials vary widely, and is particularly important in quarries processing highly clayey materials. The plant is available in standard, monolithic or compact configurations to suit a wide range of plant layouts.
How the milk-of-lime dosing plant works
Chemical conditioning of the sludge
The problem with clays
Highly clayey sludges are made up of minerals that tend to retain water. If they are sent to the filter press without preliminary treatment, filtration is ineffective, resulting in poorly formed, low-quality cakes instead of properly dewatered ones.
The conditioning action
The plant prepares a milk-of-lime suspension from powdered lime and injects it into the sludge tank before pressing. Acting as a filtration aid, the lime chemically destabilises the clay structure, allowing the trapped water to be released and making the sludge filterable.
Precision dosing
Continuous recirculation and dosing of the milk of lime are handled by a rubber-lined abrasion-resistant centrifugal pump.
Plant integration
To ensure effective conditioning, the sludge tank is sized to provide the required reaction time. Tecnoidea also fits the tank with a double-paddle agitator — with offset blades at two different heights — to promote uniform mixing.
Technology and construction
Three variants designed to suit different production volumes and space requirements.
Standard configuration
Includes a storage silo with a capacity ranging from 30 to 120 m³. The powder is extracted by a rotary valve and a screw conveyor, which feeds a dissolver positioned alongside the silo.
Monolithic configuration (Plug&Play)
An automatic solution with a minimal footprint, achieved by positioning the dissolver directly beneath the silo. It provides powdered lime storage of up to 65 m³ and can be configured with a rotary valve.
Compact skid-mounted configuration
A plant designed for low-throughput applications. It is equipped with a 1 m³ storage silo and an adjacent dissolver of the same capacity (1 m³).
Automatic shaking
The silo is fitted with an automatic shaking system that uses dried compressed air and fluidising nozzles.
Standard and optional equipment
Standard equipment
- Powder storage silo (capacity from 1 m³ for skid-mounted systems up to 120 m³ for large plants) and its dissolver.
- Configurable powder extraction device: rotary valve, dosing screw conveyor, or a combined solution.
- Rubber-lined abrasion-resistant centrifugal pump for continuous recirculation and precision dosing of the milk of lime.
- Automatic shaking system with dried compressed air.
- Hot-dip galvanised carbon-steel access ladder and inspection walkway.
- External paint finish customisable to the customer’s specifications.
Extraction configurations (optional)
Powder extraction device: Depending on the type of structure and the process requirements, extraction can be configured with a rotary valve, a dosing screw conveyor, or a combined rotary valve and dosing screw conveyor.
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