The structural properties of the cylindrical sieve developed in 1981 are as follows.
Structure
The structure of the vertical cylindrical sieve is shown in the figure below.

The machine is mainly composed of motor, reducer, tank body, water jacket, impeller, sieve plate, feeding cylinder and hose valve. The screen of the cylindrical sieve comprises a screen frame and a screen surface. The screen frame is welded from flat steel and round steel. The screen surface is composed of 53 nylon sieve plates and composed of 6 large sieve plates. The sieve holes can be replaced with sieve plates of 0.15, 0.20 and 0.30nn according to the requirements of the graded products. [next]
2. Technical parameters
The main technical performance of the vertical cylinder screen is shown in the table below.

   Cylindrical screen main technical performance

Reference    number

Ø 2000 model

LYS-3 type

Sieve diameter, m

2000

2300

Effective screening area, m 2

2

5.39

Sieve angle

90

Screen aperture, mm

0.15, 0.20, 0.30

0.15, 0.20, 0.30, 0.50, 0.75

Impeller diameter, mm

1850

2100

Impeller rotation number, r/min

22~41

0 to 40

Actual power consumption, kW

2

Production capacity, t/h

30~50

≤160

Pulp concentration, %

<40

≤40

Dimensions, m

3.0×3.0×3.5

3.2×3.2×4.58

machine     Heavy, kg

3000

7434

3. Working principle The motor drives the impeller to rotate after being decelerated by the reducer. After the slurry is fed into the ore cylinder in a tangential direction, the slurry falls uniformly along the periphery of the ore supply to the rotating impeller. Due to the combined action of centrifugal force, gravity, rising hydraulic force and mechanical stirring force, the slurry is rotated around the inside of the cylindrical sieve at a certain angular velocity, and the fine particles in the slurry pass through the sieve hole to be discharged under the sieve; the coarse particles and inclusions therein The fine-grained portion falls from the inside of the cylindrical sieve into the cone. During the falling of the material, it is subjected to the rising water introduced into the cone, so that the fine-grained portion thereof rises through the guide tube into the impeller interlayer and enters the inside of the cylindrical sieve. And sifting the newly added slurry again. After the coarse fraction passes through the rising water flow, it continues to fall to the sand discharge port and becomes the product discharged on the sieve. [next]
According to the nature of the ore supply and the requirements for the graded products, the optimum number of impeller revolutions and rising water consumption of the machine must be determined by experiment.
4. Industrial test
A processing plant in Nanshan iron ore test machine in the first industrial trial of Nanshan Iron Washan Mill plant, equipment installed in the third series production, processing a spiral classifier overflow, overflow content -0.125mm It accounts for 40-50%, and -0.076mm accounts for 30-35%. On-site requirements for the screened product -0.125m content of about 85%, -0.076mm content of more than 65%.
On the basis of the conditional test, an industrial test of 18 batches of three consecutive batches was carried out, and the average indicators are listed in the table below.

   Industrial test results

Processing capacity

product

Yield

concentration

Fractional yield, %

Fractional distribution rate, %

effectiveness,%

t/h

name

%

%

0.125

0.125~0.076mm

-0.076

total

0.125

0.125~0.076mm

-0.076

Press -0.125

Press -0.076

 

 

 

 

Mm

Mm

Mm

Mm

Mm meter

Mm meter

490

Sieve

57.34

58.59

85.87

5.67

2.46

100

88.91

29.82

14.38

 

Under the sieve

42.66

21.59

14.4

17.93

67   67

100

11.01

70.18

85.62

70.75

64.8

Feed mine

100

33.85

55.38

10.9

33.72

100

100

100

100

81.84

85.61

Note: Test conditions: impeller speed is 30r/min; rising water consumption is 8~12t/h.

The results show that the ø2m vertical cylinder sieve is used to screen the overflow product of the spiral classifier in the concave mountain plant. The mass efficiencies calculated by the -0.125 and -0.076mm grain sizes are 81.84% and 85.61%, respectively, and the mass efficiencies are 70.75. %: and 64.70%.
B Malanzhuang Iron Ore Production Test Ø2m vertical cylinder screen is installed in the production process of the Malanzhuang Iron Ore Plant to replace the flat fine screen for industrial assessment. The following figure shows the original production process (a) and the test part process (b). [next]

Industrial production inspections were carried out for nearly 5,000 hours. The results are shown in Table 1 below. The comparison indicators of the original production process and industrial inspection process selection are shown in Table 2 below.
In addition, the Dashan Iron Mine Powder Mine and the Sijiaying Iron Ore have been tested and have achieved good results. [next]

   Ø2m vertical cylinder sieve screening results (integrated indicators for industrial inspection period)

give   mine

screen   under

screen   on

Efficiency, %

grain   degree

concentration

grain   degree

concentration

grain   degree

concentration

Quality efficiency

Efficiency

-0.076mm %, %

%

-0.076mm %, %

%

-0.076mm %, %

%

52.96

43.69

82.9

20.12

33.87

56.55

46.79

60.95

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