WASHING SYSTEMS

In many parts of the world, it is hard to find a clean quarry for manufacturing concrete, asphalt, or road chippings. So, chippings are generally obtained from materials extracted from stream beds by means of a method comprising crushing, washing, screening, and dewatering.

Crushing is usually done by means of the following:

  • Jawed crushers
  • DMK-type impact crushers
  • TBK-type vertical-shaft crushers
  • Conical crushers

Showering Over Screen

Showering over screen is a method applied for materials easily washable. While the materials is moving on the screen curtain, they are exposed to pressurized water by means of nozzles screwed on pipes. Nozzles are placed in a way to expose the entire materials to pressurized water all along the screen width.

0.5 m³ to 1.5 m³ is required for 1 ton of materials (depending on the impureness degree of the material).

Washing Drums

Washing drums are generally used for materials hard to wash. While the material is moving from one side to the other side of a drum rotating at 10-12 rounds/minute, water enters into the drum from the material outlet side and discharged from material inlet side.

The length of the drum is 3-4 time of its diameter. There are some blades within the drum to direct materials. The inside surface of the drum is coated with steel (ERD3990 or HARDOX) or rubber resistant to abrasion. Drum is driven by pneumatic wheels and rotates over these wheels.

 

Dewatering Screw and Bucket Systems

Water ratio of materials dewatered by these systems is between 18% and 25%. This ratio is higher for fine materials since they absorb more water.

Undersize materials washed in screens by means of showering method (up to 7 mm in general) are fed along with dirty water to these systems. Materials are separated from the basin by means of a screw or rotating bucket group and either discharged from the system or fed to the hydrocyclone system to catch the escaping fine material.

NA-CE Dewatering Screens

Dewatering screens are used to further reduce the water content of the washed material. These screens are generally upward sloped (approximately 5o), and driven linearly with 2 vibromotors. 200-micron spaced polyurethane screen curtain is used.

While the 10-30 cm thick material is moving upward from one side, it is compacted from the other side, so water passes through the 200-micron space. The water content of the material decreased to 13%-17%.

 

NA-CE Clay Removers

One of the most important equipments for recovering the washing water is the clay remover.

Clay is separated from water by means of the state-of-the-art flocculence technology and the water is returned to the washing system. In this way, a very large sedimentation pool is not necessary.

WASHING DRUMS

Washing drums are generally used for materials hard to wash. While the material is moving from one side to the other side of a drum rotating at 10-12 rounds/minute, water enters into the drum from the material outlet side and discharged from material inlet side.

The length of the drum is 3-4 time of its diameter. There are some blades within the drum to direct materials. The inside surface of the drum is coated with steel (ERD3990 or HARDOX) or rubber resistant to abrasion.

Drum is driven by pneumatic wheels and rotates over these wheels.

Model

Sizes

Capacity min.-max

Motor

Water Requirement

Weight

mm

t/h

kW/rpm

m³/h

kg

 

TY1445

Ø1400×4500

30-50

15/1500

30

9000

TY1860

Ø1800×6000

50-60

30/1500

50

11500

TY2265

Ø2200×6500

80-100

45/1500

100

17500

FINE MATERIAL SCREW

Model

Sizes

Capacity min.-max

Motor

Weight

mm

m³/h

(0-3mm)

m³/h

(0-7mm)

kW

kg

Y14

Ø400×4000

8

13

3

1000

Y15

Ø500×5000

12

20

4

1500

Y16

Ø600×6000

18

30

5.5

2400

Y1010

Ø1000X10000

70

90

22

10500

Y1210

Ø1200X10000

100

130

22

13000

Y24

Ø400×4000

16

27

5.5

2300

Y25

Ø500×5000

25

42

7.5

2800

Y26

Ø600×6000

35

55

7.5

5200

BUCKET WASHERS

Undersize materials washed in screens by means of showering method (up to 7 mm in general) are fed along with dirty water to these systems. Materials are separated from the basin by means of a screw or rotating bucket group and either discharged from the system or fed to the hydrocyclone system to catch the escaping fine material.

Model

Sizes

Capacity

Motor

Weight

mm

t/h

kW/rpm

kg

 

KY60

Ø2700×1200

25-30

7.5/1500

9000

KY100

Ø3300×1200

50-60

11/1500

12000