Introduction of vertical roller mill and Raymond mill
Vertical roller mill and Raymond mill are similar in appearance, and many customers think they are about the same. But, in fact, they have certain differences between internal structure, grinding fineness and scope of use etc.
Vertical roller mill is a kind of grinding equipment integrating crushing, drying, grinding and grading transportation into one set. The main structure is composed of separator, grinding roller device, grinding disc device, pressurizing device, reducer, motor and shell.
Raymond mill is widely used for grinding nonflammable and explosive materials in mineral, chemical and construction industries with Mohs hardness no more than 9.3 and moisture content below 6%, such as barite, calcite, potassium feldspar, talc, marble, limestone, dolomite, fluorite, lime, active clay, active carbon, bentonite, kaolin, cement, phosphate rock, gypsum, glass, thermal insulation materials, etc.
7 Differences Between Vertical roller mill and Raymond mill
To help you choose suitable grinding mill between vertical roller mill and Raymond mill, we will introduce their differences in detail:
1. Different in operation
The vertical mill has a high degree of automation in operation, and can be started with light load. It does not need to pre-distribution of materials inside the grinding mill and it will not fail to start due to the instability of the inner material layer of the mill. It can be started again in a short time. When the system has a short-term fault, such as material cut-off, the mill can lift the roller and wait for the fault to be eliminated before production.
The operation of Raymond mill is low in automation, and the mill vibrates greatly, so effective automatic control cannot be carried out. Several sets of Raymond mills need to be equipped with corresponding operators, resulting in low labor efficiency and high labor cost.
2. Different in production capacity
Compared with Raymond mill, the capacity of vertical roller mill is larger, and the production capacity per unit hour can reach 10-170 tons, which is more suitable for large-scale milling production.
The production capacity of Raymond mill is below 10 tons per hour, more suitable for small-scale milling production.
So, if you need large-scale production capacity, choose vertical roller mill.
3. Different in products fineness
The products fineness of vertical roller mill and Raymond mill both can be adjusted between 80-400 meshes, and the products fineness of ultra-fine vertical roller mill can reach to 400-1250 meshes, which can meet the processing requirements of ultra-fine powder.
So, if you want to produce coarse powder and ultra-fine powder, vertical roller mill is a better choice.
4. Different in investment cost
Compared with vertical roller mill, the output capacity of Raymond mill is smaller, and the investment cost is relatively small, which can be selected according to your own needs and capital conditions.
5. Different in internal structure
A number of grinding rolls are evenly distributed and installed on the spring quincunx frame inside the Raymond mill. The grinding rolls move in a circle around the central axis. The grinding ring of the Raymond mill is its side wall, which is fixed. The materials lifted by the bottom blade are sent between the grinding roll and the side wall grinding ring for grinding;
When the vertical roller mill is running, the position of the grinding roller is adjusted and then fixed. The grinding roller rotates itself, while the bottom grinding disc rotates. The grinding roller and grinding disc do not contact directly. The materials are rolled and ground in the gap between the grinding roller and the grinding disc.
6. Different in maintenance
When replacing the roller sleeve and lining plate of the vertical roller mill, the maintenance oil cylinder can be used to turn the roller out of the mill shell. At the same time, three working faces can work at the same time, which is convenient for the owner to concentrate on using limited manpower and material resources. Generally, it can be completed in about 8~24 hours.
When the grinding roller of Raymond mill is overhauled, the mill is almost completely disassembled, with high labor intensity and long time. The cost of spare parts such as grinding roll, grinding ring and scraper is high.
7. Different in scope of application
The application industries of vertical roller mill and Raymond mill are almost the same, and both are widely used in building materials, metallurgy, cement, chemical industry, refractory materials, and pharmaceuticals, mining crushing and grinding and other fields.
In contrast, Raymond mill, as a traditional process, has a small investment and a large market share. 80% of grinding enterprises still use Raymond mill.
In recent years, vertical roller mill has developed rapidly, mainly due to its good production stability, because the grinding roller does not directly contact with the grinding disc, and the material layer is formed in the middle, the machine vibration sound is low, and it is more suitable for large professional industrial fields, such as cement and non-metallic mineral industries, which further improves the production efficiency and reduces the maintenance cost.
Vertical roller mill VS Raymond mill, which one is better?
From the above analysis of the differences between vertical roller mill and Raymond mill, it can be seen that the vertical roller mill is more advanced than Raymond mill in performance, but its cost is much higher than Raymond mill. For some materials, Raymond mill also has irreplaceable advantages of vertical roller mill.
Therefore, the specific selection of vertical roller mill and Raymond mill not only needs to consider the investment cost, but also needs to configure a scientific and reasonable selection scheme according to the materials, grinding fineness, production capacity and other specific needs of customers.
If want to know more about vertical roller mill and Raymond mill, contact us for more information. Our professional engineer will introduce them in detail for you and recommend suitable machine for you according to your needs!