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Fine screening refers to screening equipment with a mesh opening of less than 1 mm. The main purpose of a fine sieve beneficiation plant: First, to improve the efficiency of classification for the purpose of grading equipment as grinding circuit and other operations; the second is to improve concentrate grade for the purpose for sorting circuit. As a grading device, the classification efficiency of the fine sieve is higher than that of the spiral classifier and the force division cyclone, and it can overcome the shortcomings of the useful classification of the useful minerals in the grit in the classification process of the spiral classifier and the hydrocyclone, which is beneficial to Improve grinding efficiency and reduce over-grinding.
There are many kinds of fine sieves, and there are fixed fine sieves, linear vibration fine sieves, high-frequency vibration fine sieves and other types of fine sieves which are applied industrially or have achieved good results through industrial tests. The treatment of fine screening is generally based on actual production, industrial tests or equipment samples.
Fixed fine screen
Fixed fine screening (also called hit vibrating fine mesh nylon or nylon-like castor fine mesh) are widely used in iron ore concentrator magnetic sorting circuit (coarse to fine screen to concentrate, undersize products as concentrates, the oversize product return Grinding again). The fixed fine screen is composed of a feeding device, a nylon braided screen surface and a tapping device. According to the treatment of ore and equipment configuration requirements, each set of fixed fine screen can be made into a different number of joints (1 to 25 joints) of sieve surface, each joint screen size is generally 400mm × 1200mm, the size of the sieve hole is generally 0.15mm, Several kinds of 0.20mm and 0.30mm. The processing capacity of the fixed fine sieve is generally 8~16t/(m 2 ·h).
In recent years, China has also developed classification equipments such as linear vibrating fine screening, high-frequency fine screening, vertical cylindrical sieve and swirling fine screening. Industrial tests have achieved good results, and some have been applied in industry. The technical performance and related data are listed in Table 1 to Table 6, respectively.
Table 1 Main technical performance of KZS1632 linear vibrating fine screen
project
unit
Numerical value
Processing capacity
t/h
65
Unit throughput
t/(m 2 ·h)
15~18
Sieve width
Mm
0.4±0.1
Screen strip (width × height)
Mm
2.5×4
Screen elevation angle
(°)
7
Sieve low elevation angle
(°)
0
Working amplitude (maximum)
Mm
4.3
Vibration frequency
Times / min
960
Sieve plate (length × width)
Mm
1600×450
Screen surface (length × width)
Mm
3150×1600
Excitation angle
(°)
30
Vibration motor power
kW
4
Table 2 GPS900-3 high frequency vibration fine screen technology performance
project
unit
Numerical value
Number of vibrations
amplitude
Number of mines
Screen size (length × width)
Effective screening area
Times / min
Mm
Mm
m 2
2850
0.2~0.35
3
700×900 (three pieces)
1.6
Screen angle:
Upper screen
Medium screen
Lower screen
(°)
(°)
(°)
25
26
27
Vibrator motor power
Feed concentration
Separation granularity
kW
%
Mm
1.7
25~40
0.1~0.4
Processing capacity:
When the separation particle size is 0.1mm
When the separation particle size is 0.15mm
t/h
t/h
4~6
6~8
Unit sieve surface treatment capacity:
When the separation particle size is 0.1mm
When the separation particle size is 0.15mm
t/(m 2 ·h)
t/(m 2 ·h)
2.5~4
4~6
Table 3 DGS 2 electromagnetic vibration high frequency fine screen technology performance
model
DGS 2 -4
DGS 2 -6
DGS 2 -8
Screen size / mm
400×1200 (1560)×4
400×1200 (1560)×6
400×1200 (1560)×8
Screen size / mm
0.5, 0.3, 0.2, 0.15
Separation size / mm
0.3~0.074
Screen angle (°)
45~60
Double amplitude / mm
0.2~1.0
Vibration frequency / time · min -1
3000
Power / kW
0.45
0.65
1.5
Unit throughput t·h -1
20~35
30~50
40~60
1 means the amount of each processing.
Table 4 GPS800×1600 high frequency vibration fine screen technology performance
project
unit
Numerical value
Sieve area
Screen size
Sieve angle
Full amplitude
Vibration time
Motor Power
Dimensions
Processing capacity
Grading efficiency
m 2
Mm
(°)
Mm
Times / min
kW
Mm
t/(m 2 ·h)
%
2×0.6=1.2
0.15
15~25
0.6~2.2
2800
2×2.2
2165×2150×1820
6.6×23.0
96~67
Table 5 Ñ„2m vertical cylinder screen technical performance
project
unit
Numerical value
Sieve diameter
Effective screening area
Sieve angle
Screen size
Diameter of impeller
Impeller number
Motor Power
Processing capacity
Slurry concentration
Dimensions
Machine weight
Mm
m 2
(°)
Mm
Mm
r/min
kW
t/h
%
Mm
Kg
2000
2.0
90
0.15, 0.2, 0.3
1850
22~41
7.5
30~50
<40
3000×3000×3500
3000
Table 6 Technical performance of Ñ„150m swirl fine screen
project
unit
Numerical value
Process
parameter
Processing capacity: dry mine
Pulp
Giving pressure to the mine
Feed concentration
Sand concentration
Grading granularity
Grading efficiency
t/h
m 3 /h
MPa
%
%
Mm
%
8~14
15~25
0.03~0.06
32~44
74~80
0.074; 0.15
70~90
structure
parameter
diameter
Feeding four sizes
Overflow tube size
Sieve tube size
Grit size
Screen size
Cone angle
Mm
Mm
Mm
Mm
Mm
Mm
(°)
144
20×50 (adjustable)
1515 (adjustable)
4040 (adjustable)
1616~Ñ„22 (adjustable)
0.15; 0.30
20
Dimensions
equipment weight
Mm
Kg
420×460×1065
126