Technical features of LM vertical roller mill

Vertical roller mill is an ideal large-scale grinding equipment, widely used in cement, power, metallurgy, chemical industry, non-metallic mineral industries. It combines crushing, drying, grinding, grading conveyor in one,which make production efficiency high,it also can ground massive, granular and powdered materials into a powder material requested. Because residence time the material in the grinding interior, and therefore it has a high controllability. Due to reaction time of changing process is short, so it is suitable for fully automated.

Advantages of LM vertical roller mill

1. The process is simple.It a set preheating, grinding, upgrade in one and also has short process, small footprint.

2.GM vertical roller mill has strong self-protection, with a gear lubrication oil station, hydraulic station, roller lubrication and other ancillary facilities.

3. Abrasiving materials is under variable pressure.

4. Choosing the powder by static and dynamic regulates product quality,which has higher grinding efficiency.

5. Small amount of maintenance, wear parts and easy maintenance.

Brief introduction

The total energy consumption for ore comminution will additional boost within the next decades. A single contribution to minimise the improve will be to use more efficient comminution gear. Vertical-roller-mills (VRM) are an energy-efficient alternative to traditional grinding technologies. A single purpose would be the dry in-bed grinding principle. Final results of extensive test operates with two sorts of magnetite iron ores in a Loesche VRM are presented right here. Within these test operates, mill parameters like grinding pressure, separator speed and dam ring height had been varied, following a factorial style of your experiments. The effects with the grinding parameters on the liberation of worthwhile minerals are characterised utilizing mineral liberation evaluation (MLA). It can be shown how the different mill parameters influence essential performance values like power consumption, production price and mineral liberation. Through various regression evaluation, an optimal parameter variety could be modelled for both ore types. The parameter predictions have already been successfully verified in practical test operates.

Disclosure in the invention of vertical roller mill

According to the present invention, brackets have their one ends connected to grinding rollers as well as the other ends pivoted in the side of a casing and are pulled downward at a portion adjacent towards the roller mounting position, the grinding rollers becoming pressed against a roller table, whereby the material is pulverized into preferred particles or powder involving the grinding rollers along with the roller table. In this way, by pulling directly downward the brackets at their portion adjacent towards the roller mounting position, reinforcement members for the brackets could be quick in length and tiny in size, whereby the all round weight in the mill apparatus could be greately decreased; maintenance and inspection including replacement of roller liners might be facilitated; roll liners could possibly be individually replaced, which facts are advantageous from an economical viewpoint. Moreover, during pulverization, grinding pressures from the respective rollers can be individually adjusted in accordance together with the accumulated volume in the pulverized material, etc. and the modify in stress of a single roller is not going to adversely influence the grinding actions on the remaining grinding rollers.

Technical field of vertical roller mill

The present invention relates to a vertical roller mill which can force grinding rollers against a rotary table in a very effective manner, which may be produced considerably light in weight and which can facilitate inspection and upkeep.

Vertical roller mills have already been broadly utilised to grind components such as coal or cement raw materials into preferred size of finely divided particles. In general, the material fed into the casing is pulverized in between the rotary table as well as the grinding rollers which are pressed against the rotary table to rotate in accordance using the rotary table, along with the pulverized particles are carried outside from the casing by the preheated gas or the like blown upwardly about the rotary table.

In the case of the "swing arm" sort mill, a swing arm extends from a stand installed exterior of a mill casing into the interior with the casing. A grinding roller is supported at the top end from the swing arm and pressed against a rotary table by inclining the swing arm by inclining implies.

Technical data

Model

LM130K

LM150K

LM170K

LM190K

LM220K

LM130M

LM150M

LM170M

LM190M

LM220M

LM130N

LM150N

LM170N

LM190N

LM220N

Wheel diameter(mm)

1300

1500

1700

1900

2200

1300

1500

1700

1900

2200

1300

1500

1700

1900

2200

Output (th)

10~28

13~38

18~48

23~68

36~105

10~17

16~22

20~30

26~40

35~50

5~14

7~20

9~27

12~30

18~55

Finish fineness

µm

170~40

170~40

170~40

170~45

170~45

170~45

170~45

170~45

170~45

170~45

Mesh

80~400

80~400

80~400

80~325

80~325

80~325

80~325

80~325

80~325

80~325

Coal powder fineness (R0.08)

5~20%

5~20%

5~20%

5~20%

5~20%

Coal powder moisture (%)

<1%

<1%

<1%

<1%

<1%

End product moisture (%)

≤1%

≤1%

≤1%

≤1%

≤1%

≤1%

≤1%

≤1%

≤1%

≤1%

Grinding material particle size D80 (mm)

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

<10

Grinding material max feed size(mm)

<38

<40

<42

<45

<50

<38

<40

<42

<45

<50

<38

<40

<42

<45

<50

Moisture of grinding material not to dry (%)

<4%

<4%

<4%

<4%

<4%

<4%

<4%

<4%

<4%

<4%

Matieral moisture of into mill (%)

<15%

<15%

<15%

<15%

<15%

Moisture of grinding material need to dry (%)

4%-15%

4%-15%

4%-15%

4%-15%

4%-15%

4%-15%

4%-15%

4%-15%

4%-15%

4%-15%

Into mill air temperature (℃)

<350

<350

<350

<350

<350

<350

<350

<350

<350

<350

<350

<350

<350

<350

<350

Out of the mill air temperature (℃)

70-95

70-95

70-95

70-95

70-95

75-95

75-95

75-95

75-95

75-95

70-95

70-95

70-95

70-95

70-95

Raw coal hardgrove grindability index (HGI)

>55

>55

>55

>55

>55

Main motor power (kw)

200

280

400

500

800

185

250

315

400

500

200

280

400

500

900

Contour dimension

Length (mm)

5520

6550

7170

7580

7920

5520

4200

4700

7580

7670

5520

6550

7170

7580

7920

Width (mm)

2500

3070

3460

3320

4870

2500

3900

4500

3320

4660

2500

3070

3460

3320

4870

Height (mm)

7060

7560

8300

8960

12280

7060

7100

8300

8960

11280

7060

7560

8300

8960

12280