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Vertical Roller Mill

Raw materials: superfine vertical mill can be used in many types of stone powder process. such as: calcium carbonate, marble, graphite, calcite and other more than 200 kinds of stone materials.
Capacity: 40 t/h
Max feeding size: below 30mm
Application: suitable for processing various non-flammable and non-explosive mineral materials, it is widely used in the fields of metallurgy, construction, chemical industry, mining, highway construction etc
Shipping ports: shanghai
Delivery: 2 weeks

Overview

Application of vertical roller mill:

Vertical roller mill are suitable for huge capacity producing, widely used in grinding non-flammable and non-explosive materials under 9.3(the Moh's hardness), such as quartz, feldspar, calcite, talcum, barite, fluorite, iron ore, copper ore quartz, especially for slag, cement clinker, zircon sand, fly ash and carborundum, coal, etc.

 

Working principle of vertical roller mill:

The grinding disc is driving by motor through reducer. The material falls to grinding disc from the feed opening. The materials are driven to the edge of disc by the centrifugal force and crushed into fine powders by rollers. Then, the hot air from the nozzle take the fine powder to high effiency classsifer.The qualified powder are taken by the air to the powder collector to be collected, while the unqualified powder are sent back for regrinding. 

Benefit

 Advantages of vertical roller mill:

1. High grinding efficiency: save 20~30% power consumption compared with the ball mill. With the increasing of moisture content, it can save more and more electricity.

2. Strong drying capacity: dry and grind raw materials with moisture content as much as 15%.
 
3. Mutifunction: crushing, drying, grinding, separating and conveying.
 
4. Low noises and little dust: no direct contact between the grinding rollers and grinding disc, so metallic impact is avoided and its noises is 20~25 decibels lower. Totally closed negative pressure operation has employed by this vertical grinding mill, so there is no dust during the operation.
 
5. Low wear rate and little metallic pollution: its metal wear is only 5~10g/t.

Specifications

Measurement items Name Take an example inultrafine ground calcium carbonate
Output t/h 13-17 11-13 9-10 7-8
Specific surface area c㎡/g 11000±500 13500±500 15000±500 17000±500
325 mesh remaining amount % 0.015 0.015 0.01 0
Less than 2μm powder % 34±2 40±2 45±2 50±2
Median partical diameter D50 μm 4.3 3.7 2.4 1.86
Partical size distrihution D97 μm 30 25 20 15
Partical size cut point μm 80 48 38 28
Close apparent specific gravity g/cm³ 1.18 1.06 0.90 0.85
Loose apparent specific gravity g/cm³ 0.45 0.40 0.34 0.32
Moisture content %

less than 0.3

Sedimentation volume 1 hour later 24 27 33 43
Energy consumption kw/t 38-40 40-50 47-53 50-53

 

 

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