25-30tph Raymond Mill for Grinding Calcium Oxide
The project was carried out in coordination with a technician at a steel mill who needed to grind calcium oxide for use as a flux. His mill had purchased Raymond mills from other suppliers, but they had issues such as high vibration and insufficient product fineness. After a detailed discussion, the client decided to purchase one of our mills.
The MR Raymond Mill met the production requirements, operated with great stability, and featured a control system that facilitated necessary adjustments. The production line has been generating highly reactive calcium oxide powder, meeting the client’s standards, and the client has been very satisfied with the results.
Project Information
Raw Material: Calcium Oxide
Feed Size: <30 mm
Output Size: 100 Mesh
Production Capacity: 25-30 t/h
Passing Rate: 98%
Mill Model: MGW198
Location: Latin America
Questions and Answers
Question 1:
How is the fineness and purity of the powdered product guaranteed if, when calcium oxide is used as a flux, its reactivity increases when these parameters meet the requirements?
MR Answer 1:
High-purity, 100-mesh calcium oxide powder has high reactivity. The cage classifier of the MR Raymond Mill, thanks to its special structure and high classification efficiency, can guarantee that the fineness of the finished product reaches 100% passing through the 100-mesh screen. Only the powder that meets the particle size requirements is discharged, while the powder that does not meet the requirements falls back into the grinding chamber for regrind.
Question 2:
Calcium oxide powder has very good flowability. The equipment we used previously was prone to vibration during operation. Does your equipment also have the same problem?
MR Answer 2:
The client needs to grind the calcium oxide into a powder, and with the additional requirement of a 100-mesh particle size, this will result in extremely high flowability of the final product.
Considering the specific conditions of the client’s project, the reasons why the equipment might vibrate are:
1. Feed particle size too fine:
Due to the presence of many fine particles in the feed, these will be carried away by the airflow, preventing the formation of a “material layer” between the roller and the grinding ring. This causes direct contact between the roller and the ring, resulting in vibrations in the equipment.
MR’s Response:
We recommend that the customer ensure the feed particle size is not excessively fine, guaranteeing that the particle size of most of the incoming calcium oxide is approximately 30 mm.
2. Insufficient Fan Airflow: When there is insufficient airflow to carry the ground powder, it accumulates inside the equipment and cannot be expelled. This accumulated powder is repeatedly ground by the rollers, which excessively increases grinding resistance and pressure on the rollers, causing vibrations in the equipment.
MR’s Response: The entire MGW Raymond Mill is equipped with a control system. This system can adjust and set the upper and lower limits of the fan flow according to the actual operating conditions of the equipment, thus ensuring sufficient airflow to carry the finely ground powder and prevent the accumulation of finished product inside the equipment.
Advantages of the Project
1. Integrated Computer and Manual Control Functions.
In addition to allowing the customer to adjust fan parameters to resolve equipment vibration issues, other equipment can also be configured with corresponding parameters according to project requirements. It features a one-button start function, simplifying operation. In case of failure, the computer will automatically sound an alarm and shut down, minimizing damage to the machinery. Furthermore, it includes a convenient manual control mode as a backup.
2. Curved Air Duct
The air inlet scroll’s observation door features a double-layered structure. The inner door plate is positioned on the same curved surface as the entire air duct, effectively reducing air resistance and consequently lowering the system’s energy consumption. Furthermore, the curved air duct also reduces airflow resistance and flow losses, minimizing blockages. This design also helps the customer increase calcium oxide powder production.
3. Bevel Gear Drive and Integrated Oil Pump
The main machine utilizes a bevel gear drive and an integrated oil pump, eliminating the need for separate oil pumps or lubrication stations. Furthermore, it is equipped with a cooler, simplifying installation and maintenance. This helps reduce future maintenance costs for the customer and ensures continuous production of calcium oxide powder without disrupting normal steel mill operations.
Plant Photos
Customer Comments
We had previously purchased a Raymond mill from another factory, but that equipment was of very poor quality: it didn’t meet our production requirements, and the reactivity of the final product was also poor. This severely impacted our production and caused us many difficulties.
Therefore, during our communication with the MR team, we were very worried that we might encounter the same problems. However, MR was very patient in explaining the causes of those issues, providing us with solutions one by one, and also informing us that they would send engineers to our plant to guide the installation. They told us that if any problems arose, we could contact them at any time. This was very reassuring and put our minds at ease.
And the reality has been exactly as they said! Our equipment has been operating for over three months now without any problems. The production and the fineness of the product are exactly what we wanted. Excellent!
