Sink Float Tank / Separation Tank

                                                                                       

View of the Sink Float Tank  Conveying Drums with Vanes

The new series of high volume tanks emerged from the longstanding experience of Costarelli in the design and construction of washing plants. The special challenge of post consumer plastic waste required new technologies, with special consideration of the high content of the  sinking content of the material and its subsequent processing  to ensure a high degree of recuperation of plastic material. The design of the tank separates the floating material and the sinking material in one single tank, which simplifies the concept of the whole plant.

The tank pre-washes the shredded material (about  5 x 5 cm) and separates via float/sink method the floating fraction (Polyolefin's) from the plastic material with specific weight  > 1 (PS, PET, PVC etc.) and of a large part of the paper and carton. For a thorough washing effect (complete elimination of paper EPS) the Centrifuges, i.e.. a Turbo-Wash upstream and a  Dynamic-Centrifuge downstream is recommended.

The water circulates in closed loop and ist treated in a water treatment plant.

Installed Power [kW] acc. detailed design
Length / Width of Tank [m] ca. 9.5 or 12.0 x 2.0
Water Volume [m3] ca. 10 - 15
Water in closed loop [lit./min]  200
Production [t/h] dep. on material and degree of contamination ca. 1.5 - 2.0

 

Presentation Video of new modular Swim-Sink Tank in  operation

New line of modular tanks with 1 m standard segments, "goose neck" discharge for sinking faction and forced feeding with submerged augers for material    

Effectiveness of Float-Sink Method

The following table shows the high effectiveness of the method. The results were obtained by an independent institution in a plant  for mixed plastics, which is an extremely difficult material.

 

 

 

 

 

 

Input

Recuperation

Separation

Separation/Losses

 

[kg]

Output

Slicks

Slicks

 

 

Floating Fraktion

Sinkfr.+Centr.

 in Grinder, Tank, Centrifuge

Contents %

 

 

 

 

PP-Film

1.9%

99%

 

 

PP-rigid

29.8%

87%

 

 

PE-Film

7.3%

97%

 

 

PE-rigid

18.8%

98%

 

 

Film compound <1

2.0%

98%

2%

 

Film compound >1

1.9%

2%

98%

 

EPS

1.8%

22%

78%

78%

PS

22.1%

0%

100%

2%

Paper/Carton

4.4%

0%

98%

24%

PET

5.1%

0%

100%

5%

PVC

1.7%

0%

99%

5%

Metals

1.0%

0%

100%

1%

Residue

2.1%

0%

100%

2%

  

 

OCI GmbH
Baarerstrasse 95, CH 6301 Zug, Schweiz
GF: Hubert v. Navarini, Dipl. Ing.
Tel +41 81 3531685 / Fax +41 81 3535109
navarini@navarini.com
Officine Meccaniche Costarelli s.r.l., Perugia (I)

 

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