Smaller foundations and less floor space needed gives lower installation costs
Main features for IPS models LT, LTS and LTK clarifiers
- Heavy duty construction of tank, sludge hopper and inclined plate packs, as well as the rake system. Rake lifting mechanism as option
- Positioning of specifically designed feed ports for optimum ratio between clarification and thickening area
- Wide spacing of inclined plates to handle high density feed pulps and coarse solid particles
- No short circuiting or surface turbulence
- Integrated flocculator with variable speed stirrer
- Shorter pipework runs
- High level installation for gravity feed to downstream processes
- Easier supervision
Main benefits for IPS models LT, LTS and LTK clarifiers
- Delivered as one-piece unit or in prefabricated sections together with smaller foundations and less floor space needed gives lower installation costs
- Square outline for easier planning and construction
- Can be installed in any system and is easy to relocate to adapt to process changes gives flexibility for plant extensions
- Small internal volume and surface area
- Easily insulated against heat loss or toxic fume emissions
- Evaporative losses are minimised.
- Simple construction of sheet steel and standard profiles
- Special materials and coatings can easily be incorporated
- Easy to maintain
Inclined plate principle
Metso's inclined plate principle uses parallel inclined plates to minimize floor area occupation. The size and cost of the gravity settler can be reduced by matching the thickening and clarifying requirements more closely. Two basic criteria for gravity settling equipment are good clarity of the overflow liquid and maximum density of the underflow solids discharge. The area needed to clarify a suspension is often greater than that needed for thickening. This means that in a cylindrical thickening tank, the lower section with rakes and drive mechanism can be oversized. Metso IPS has proven interesting in the Potash Industry.
Prefabricated units with up to 500 m2 settling area.
How it works
The Inclined Plate Settler (IPS) consists of two main components, the upper tank containing the lamella plates inclined at 55° and the lower conical or cylindrical sludge tank.
The feed for the IPS enters through vertical chambers on either side of the plate packs and passes into each plate gap through slotted feed ports. Clarification takes place above the suspension inlet so there is no mixing of the clarified fluid with the incoming feed.
Above each pack is a full-length overflow launder fitted with throttling holes to create a slight hydraulic back pressure on the incoming feed stream. This method of feed control guarantees equal distribution to all inclined plate pack chambers with minimum turbulence at the entry points.
The solids settle onto and slide down each plate pack to the sludge tank where the solids are further thickened and compressed with the assistance of the raking system.