Rod mill

The structure of the rod mill is basically the same as that of the ball mill . The main difference is that the rod mill does not use a grid plate for ore discharge, but uses an open type, overflow type or peripheral type of discharge device.
The medium used in the rod mill is a round steel rod that is 10 to 15% shorter than the length of the cylinder. In order to prevent the steel bar from tilting during the operation of the mill, the end cap liners at both ends of the cylinder are usually formed as straight end faces perpendicular to the axis of the mill, and the length to diameter ratio of the mill cylinder should be maintained at 1.5 to 2.0. Rod mills use non-smooth liners such as corrugated or stepped shapes. The diameter of the hollow journal of the discharge end is much larger than that of the overflow ball mill of the same specification, in order to speed up the passage of the slurry through the mill. When the rod mill is in operation, the steel rods in the cylinder are in line contact, and the material with a larger particle size is first pulverized. When the steel rod is driven up, the coarse particles are often clamped between the rod and the rod, and the fine particles are easily leaked from the gap of the rod with the slurry, so there is a kind of "screening classification" between the rod and the rod. To make the rod mill have a strong "selective grinding" characteristics.
The structural feature of the end cap and hollow journal of the ore-mining end of the open-type rod mill is that there is no hollow journal at the discharge end of the mill, but a large flared overflow port is opened in the center of the discharge end. In order to prevent the slurry splash and the steel rod from sliding out of the mill barrel, the discharge port is blocked by a fixed conical cover, and the slurry overflows through the annular space between the flared overflow and the cover.
The peripheral mine-type rod mill is divided into two types: the end of the cylinder (the end of the discharge) and the type of the middle of the cylinder. In addition to different mining methods, the other structures are basically the same as the overflow ball mill, in view of the advantages of high grinding efficiency, energy saving and product quality. It has been applied in some industrial production in China. It can be used as dry, wet grinding and wet grinding operation. The grinding concentration in wet grinding process can reach 87~92%, and the pellet operation is commonly used. The main parameters of the rod mill are shown in the table below.

Table Main technical parameters of wet rod mill
Types of
Models and Specifications
Effective volume m 3
Tube rotation number r/min
Maximum ball (stick) amount t
Drive motor
model
Power kW
Voltage V
Wet rod mill
Φ900×1800
Φ900×2400
Φ1500×3000
Φ1500×3000 (middle discharge)
Φ2100×3000
Φ2100×3000 (middle discharge)
0.9
1.2
5
4.4
9
9
35.4
35.4
26
26
20.9
20.9
2.5
3.55
8
13
25
25
twenty two
30
95
95
210
210
380
380
380
380
380
380
Φ2700×3600
Φ2700×4000
Φ3200×4500
Φ3600×4500
Φ3600×5400
18.5
20.6
32.8
43
50
18
18
16
14.7
15.1
46
46
82
110
124
TDMK400-32
TDMK400-32
TDMK630-36
TDMK1250-40
TM1000-36/2600
400
400
630
1250
1000
6000
6000
6000
6000
6000
Dry rod mill
Φ2100×3000 (peripheral mine discharge)
9
20.9
25
210
380
Types of
Thin oil station
Dimensions
(length × width × height)
The heaviest component weight t
Weight t
price
Manufacturing plant
model
Water cooling with m 3 /h
yuan
Wet rod mill
XYZ-25
XYZ-25
1.2
1.2
5000×3380×2020
5670×3380×2020
7635×3341×2766
7497×3341×2766
8600×4700×4400
9100×4700×4420
2.04
2.55
6.92
7.36
13.77
17.5
5.37
5.88
18
17.29
42.18
57
20000
24000
96000
120000
heavy
Ordinary mine
Shen Ye
GXYZ-40
GXYZ-40
GXYZ-40
XYZ-40
20.100
3.0
9735×5757×4675
12700×7232×5652
15200×8800×6800
15910×8040×6726
24.70
28.9
39.50
46.84
60.7
68.00
73.3
108
159.9
150
290000
heavy
Rich
Luo Mine
Hengye
Shen Ye
Dry rod mill
XYZ
1.2
8100×4740×4420
13.77
43.78

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