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.
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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