high-pressure grinding rolls

High-Pressure Grinding Rolls

High pressure grinding rolls(HPGR) introduction

GM series HPGR is composed of two squeezing rollers ,which are rotated in opposite direction but synchronously.The material is fed from the top of the rollers and enters into the gap between the rollers.The material would be crushed by the high pressure of rollers and discharged a a solid cake.Its mainly used for nonferrous metal ore such as bauxite,iron ore,fine iron and other materials such as fine crushing cement raw material, clinker,furnace slag and limestone.

In recent years,Luoyang Zhongyuan’s HPGRs have performed, quite well in metallurgy industry because of our good property and reasonable price.They are specially used in the process of mineral separation on iron ore,bauxite, and gold ore,which made us win a praise from our customers’ side.

HPGR WORKING PRINCIPLE

HPGR
The closed material would be forced to moved down under the pressure of te two rollers. At this time,the extrusion pressure gets increased large enough, and finished solid cake would be released from the machine by crushing.

The solid cakes are with low mechanical strength,they could be easily twisted as powder by hands .A large amount of fine powder is included on the solid cakes . Among them finished tiny particles of less than 90 meshes accouts for 20-30% ,while the particles of less than 3mm accounts for 60%.

And micro cracks generated within the larger particles,it would be extremelyfavourable for further grinding.

High pressure grinding rolls Advantages

1. Using a high-pressure roller mill in the process of the grinding system can increase the production efficiency of the entire system by 20% to 30%. At the same time, the total power consumption of the grinding system can be reduced by 25 to 50% compared with the conventional grinding method.

2. This product is equipped with a sealing roller cover, which can strictly control the diffusion of harmful dust and create an excellent production environment.

3. Compact structure, small footprint, high reliability, and an operating rate of approximately 95%.

4. This product is low in energy consumption and low in pollution. It is a series of products that respond to national energy conservation, emission reduction and low carbon environmental protection.

Roller width

Order notes

Please present the following clearly in contract such as material characteristics, requirements of material feeding and discharging, capacity;

The equipment is supplied as right-installed generally. Please specify in the contract if it needs to be assembled at left.

The standard configuration does not include the electric control system. Please specify in the contract if electric control system is needed.

High pressure grinding rolls technical parameter

Model
Roller dia.mm
Roller width
mm
Power kw
Feeding sizemm
Finished size mm
Throughput t/h
Weight
t
Metal ore (mm)
Powdered Iron
cm2/g
Metal ore (mm)
Powdered Iron
cm2/g

GM600-200

600

200

2X75

≤25

1100-1300

≤3

1400-1600

16-24

14

GM800-350

800

350

2X132

≤30

1100-1300

≤3

1400-1600

50-65

24

GM1000-300

1000

300

2X160

≤35

1100-1300

≤3

1400-1700

61-91

32

GM1000-400

1000

400

2X200

≤35

1100-1300

≤3

1400-1700

80-120

36

GM1000-500

1000

500

2X280

≤35

1100-1300

≤3

1400-1700

100-150

40

GM1200-500

1200

500

2X315

≤40

1100-1300

≤3

1600-1800

130-190

56

GM1200-630

1200

630

2X400

≤40

1100-1300

≤3

1600-1800

160-240

65

GM1200-800

1200

800

2X500

≤40

1100-1300

≤3

1600-1800

200-310

79

GM1400-800

1400

800

2X560

≤50

1100-1300

≤3

1600-1800

260-390

110

GM1400-1100

1400

1100

2X800

≤50

1100-1300

≤3

1600-1800

360-540

133

GM1700-1100

1700

1100

2X1000

≤60

1100-1300

≤3

1600-1800

530-800

179

GM1700-1400

1700

1400

2X1250

≤60

1100-1300

≤3

1600-1800

670-1000

208

STRUCTURE & CHARACTERISTICS

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HPGR structure

Main Part of HPGR

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The main frame of the high-pressure grinding roll is a frame-combined structure with a beautiful appearance. It is formed by a combination of eight square beams up and down, front and back, and left and right. The connection is firm. A fixed bearing seat, a movable bearing seat and a cylinder are installed in the frame.

When disassembling, only the bolts in the frame are removed, and the upper beam can be removed, which is convenient for maintenance and replacement of spare parts.

ROLLER SUPPORT

Roller support

(1)Adjusting the radial clearance of double row spherical roller bearing by using hydraulic method. Before installation,the radical clearance shall be within the scope of 55-145 microns,and it would decrease 38-116 microns after installation.And ensure the minimum residual clearance is not less than 20 microns.Hydraulic method should also be used when bearing change.The above data is only applicable to model GM1000-500.

(2)Bearing outer ring axial clearance adjustment.There must be a certain axial clearance to ensure the bearing moved axial on the process of rollers thermal expansion.After setting down bearing radial clearance, can be used on both sides of the bearing pressure along the method to adjust at the same time, and the detect clearance is 0.5 mm(When the outer ring with a loose situation, it would also be allowed in the lateral accumulation setting).

(3)In order to prevent dust from entering the bearing,which would cause damage bearing. It is equipped with double dust-proof maze,bearing cavity spilled oil will fill the slots in a maze and have a better dust-proof effect.

FEEDING DEVICE

Feeding device

STUFFING PROTECTION DEVICE

stuffing protecting device

ROLLERS GAP ADJUSTINGDEVICE

roller gap adiusting device

Rollers gap adjusting device can realize the adjustment of the roll gap within a certain range.Our general work rollers gap is 10 mm,which could also be adjusted according to the condition.At the same time,it could realize the rollers gap calibration by reducing the plate group when the rollers’ surface is worn.

Pulling out the moving roller opposite direction through manual control hydraulic system when adjusting. Then putting out the plates group and make a redistributioncombination,it would achieve the rollers gap adjustment.

PROCESS CONTRAST

ITEM HPGR Grinding System 1 Grinding System 2
Allowed feeding material moisture <10% <8% <8%
Needed machine GM 1400X800 ¢3.5*6.2 Moisturizer (three sets)

3SETS DAMP MILL

¢3.8*7 moisturizer (two sets)

3SETS DAMP MILL

Installed capacity 2*560KW 3*1000KW 2*1250KW
Throughout >210t/h <200t/h <180t/h
Specific surface area -200 mesh content increased by 10-15%; specific surface area increased by 300-500cm2/g -200 mesh content increased by 8-10%; specific surface area increased by 200-300cm2/g
Propertty Angular particles with micro cracks inside tiny cracks inside No cracks
Bentonite Amount 0.8-1.5% 2-3%
Green ball density Compressive strength 24. 2N/piece 17N/piece
Drop strength 44.1 times/0.5m 37times/0.5m
Working environment No dust, low vibration, noise less than 85dB

SAFE AND CLEAR

There is dust, large vibration, and noise greater than 100dB

NOISY AND DIRTY

Technic ADVANCED OUTDATED
Electric charge 8.87 million degrees *0.5 yuan = 4.43 million yuan 23.76 million degrees *0.5 yuan = 11.88 million yuan 19.98 million degrees * 0.5 yuan = 9.9 million yuan
Machine fees About 7.5 million yuan 3*300=9 million yuan 2*400=8 million yuan
Tatal input for one year 11.93 million yuan 20.88 million yuan 17.9 million yuan

To sum up: it woulld save input cost and electricity every year.

The use of High Pressure Grinding Rolls is gaining significant interest as are placement for traditional milling in the comminution of hard rock ores because of the potential for reduced costs in tems of energy and grinding ball consumption.