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The advantages of vertical mills compared with ball mills

15 Dec,2020 UTC+8 Views:

Vertical mill is a kind of ore grinding equipment with both crushing and grinding functions. It uses the ground material itself as a medium for operation. The name of the slag vertical mill is similar to that of the ball mill, but the working principle and structure of the vertical mill are quite different from the ball mill. Next, the vertical mill manufacturer Chaeng will analyze the difference between a vertical mill and a ball mill for you.

First, compare the grinding media of the vertical mill and the ball mill. Vertical grinding machine, as the name implies, is a non-medium mill, no steel balls, steel bars, etc., and the material to be crushed is the crushing medium. This can effectively reduce the iron pollution of the finished product. In addition, the material particles rub against each other to prevent excessive crushing. The ball mill relies on the steel ball medium to participate in the grinding, so the product will be more muddy and suitable for the production of powdered products.

Secondly, compare the feeding part of the vertical mill and the ball mill. The feeding part of the vertical mill and the ball mill adopts a trolley-type welded chute structure with a wear-resistant liner embedded in it. Since the feed does not contain grinding media, the wear and impact on the equipment body are relatively small, and the feed point of the feeder chute is far away from the side of the mill cylinder. The feed material of the ball mill contains grinding media, which has relatively large abrasion and impact on the equipment body. In order to effectively reduce the impact of the material on the feed liner, the feed point of the feeder chute must be as close as possible to the mill cylinder. Because of the large feed size of the ball mill, the chute of the feeding part must have a larger slope and height for smooth feeding.

Then, the difference between the vertical mill and the ball mill is analyzed in terms of structure and installation. The GRM vertical mill has a simple structure, adopts vertical installation, small footprint, simple infrastructure, convenient installation and short time-consuming. However, the structure of the ball mill is relatively complicated, and it adopts horizontal installation, which is difficult to install, requires high foundations, long period, and covers a large area. Both can be arranged in the open air, but generally speaking, the construction area of ​​the vertical mill is 70% of the ball mill, and the construction space is 50%-60% of the ball mill, and the investment cost is low.

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In addition, the process flow of the two is also different. The vertical mill integrates crushing, drying, grinding, and grading and conveying. Compared with the ball mill, the vertical mill has a simple process and small capital investment, which can save a dryer for the mill system. In addition, the vertical mill has a separator and uses hot flue gas to transport materials. It does not require a powder classifier and a hoist. The dusty gas from the mill is directly collected in the powder collector, so the vertical mill system has simple process, low failure rate and high operation rate. , The layout is compact. Generally speaking, the finished product of the same fineness adopts the vertical milling process. After two stages of grinding, the product fineness can reach the required level. The traditional ball mill process requires three stages of grinding.

After the above analysis, it can be seen that the vertical mill has advantages in terms of structure and installation, grinding method and process flow.

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