Raw Mill

Raw Mill

Raw mill is mainly used in grinding raw materials and end products in cement plant. It is also suitable for various ores and other materials metallurgy, mine, chemical and construction. Besides, it has two forms of milling, one is an open form, and the other is a recycle close form equipped with powder concentrator. It is widely applied in many industries and has convenient operation.

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Description

The raw material is finish-ground before being fed into the kiln for clinkering. This grinding is done using either ball mills or vertical roller mills (VRM). The raw material is simultaneously dried.

Ball mills use impact with attrition principles for grinding the raw material. Inside the ball mills, various sizes of balls are used and classifying liners are used to maintain the position of different sizes of balls. The larger sized balls are utilized for impact grinding and the smaller balls for attrition. VRM uses the compression principle to grind the raw material.

The choice between a ball mill and VRM is governed by many factors such as the moisture content of the raw material, the size of the plant, the abrasiveness of the material, the energy consumption levels, reliability, and finally financial considerations.

Ball mills are suitable for low and medium moisture content in the range of five to six per cent and are preferred for abrasive material. The main advantage of VRM is higher grinding efficiency and ability to accept material with higher moisture content.

Normally the energy consumption level in VRM is 10 to 20 percent lower than in ball mills.

Features

  • 1. Strong adaptability;
  • 2. Continuous production;
  • 3. Large crushing ration;
  • 4. Easy to adjust the output product's size.

Technical data

Specification (Dia×Length) Rotating speed (r/min) Feed size (mm) Capacity (t/h) Grinding media load (t) Main motor Main reducer Weight(t)
Model Power(kw) Rotating speed (r.p.m) Model Reduction ratio
φ2.2×7 21.4 ≤3 20~25 31 YR148-8 380 740 ZD70-9 5 49
φ2.2×13 21.6 ≤25 33~37 58~60 YR630-8/1180 630 740 MBY630 5.6 53.4
φ2.4×13 21 ≤25 45~50 65~70 YR800-8/1180 800 740 JDX710 5.6 131
φ2.6×13 20 ≤25 45~46 80t(max) YR1000-8/1180 1000 740 TDX800 6.3 153
φ6.2×6.4 18.5 ≤25 32~41 86~90.5 TDMK1000-36 1000 740     134

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