Meeting Minutes : Phorum 5
The monthly meeting minutes.
Precautions for use of vertical grinding rolls and grinding discs
Posted by: kuangshanposui (---.148.16.81.vultr.com)
Date: July 02, 2018 07:33PM
The status quo of vertical grinding disc:
With the development of the inner mine, the size of the vertical roller mill is gradually developing towards the large size. With the development of the inner mine to the refinement direction, the requirements for the vertical grinding disc and the vertical grinding roller are also increasing. Strictly, the entire inner mine coal mill and vertical roller mill accessories market are in need of two new types of mine vertical grinding discs, vertical grinding rolls, grinding discs to change the overall situation.
The three main uses of vertical grinding discs:
1) For re-election or magnetic separation plants of tungsten-tin ore and other rare metal ores, in order to prevent the damage caused by over-grinding, vertical grinding rolls are often used;
2) When using the two-stage grinding process, if the second section is ground from 20 to 6 mm to 3 to 1 mm, when the vertical grinding roller is used as the second section of the grinding equipment, the production capacity is larger and the efficiency is higher. high. Since the bar-to-charge ratio of the two weights is much smaller than the surface area of ​​the weight ball, the bar mill has lower productivity and efficiency than the ball mill in the second stage of fine grinding;
3) In some cases, it can be used to make a small crush instead of a short-head cone crusher. When dealing with softer or less hard ores (especially viscous ores), use a vertical grinding roller to grind 19-25 mm (or even 32 mm) ore to 6-10 mesh than to use a short cone The crusher and the screen are simple in configuration and low in cost, and can simplify the dust removal in the crushing workshop.
Coal mill / coal mill grinding roller is widely used in cement, silicate products, new building materials, refractory materials, fertilizers, black and non-ferrous metal dressing and glass ceramics, etc., for various ores and other grindable materials. Dry or wet grinding.
Analysis of the phenomenon of vertical grinding vibration:
During the running process of the vertical roller mill, due to the quality problems of the vertical grinding disc used, the phenomenon of broken rods and vibration may occur, causing huge losses to the enterprise. Then, how does this happen?
Analysis of the causes of broken bars and vibrations:
Everyone should be soberly aware that the reason why this happens in the vertical roller mill, the problem should be in the vertical grinding disc used.
A, the material used in the vertical grinding roller: internal loose. Steel mill billet problems, only the extra large steel mills can meet the internal tight technical requirements, especially for diameters above 70mm. Although most steel mill billets can be finished, the compression ratio and hardenability are very low, that is, the organization is not tight. .
B. Vertical grinding roller production process: the internal internal stress is not relieved. The broken roll is like an explosion, which starts from the inside. The principle of the steel mill producing the grinding roller is like blowing a balloon. The internal stress must be removed to prevent the broken roller.