Raymond mill and magnesium oxide

Magnesium oxide is a widely used inorganic compound. In the field of refractory materials, it is the core raw material for manufacturing refractory bricks and refractory coatings, providing protection for high-temperature industrial equipment; in the pharmaceutical industry, it is used as an antacid and laxative to relieve the problem of excessive gastric acid; in the field of environmental protection, it can treat industrial wastewater and waste gas to help environmental protection; in the electronics, rubber, plastics and other industries, it can improve product performance and expand the scope of application. The Raymond mill can grind magnesium oxide into powders of different finenesses to meet the needs of different industries.

Processing magnesium oxide with Raymond mill

Raw material pretreatment: When processing magnesium oxide, raw material pretreatment is crucial to grinding efficiency, quality and equipment operation. Raw material moisture content exceeding 6% will cause problems, such as wet material adhering to the grinding roller, reducing grinding efficiency, and may also block the analyzer. Therefore, it needs to be dried with a rotary dryer. Large pieces of raw materials need to be pre-crushed into particles ≤30mm with a jaw crusher to improve grinding efficiency and reduce equipment loss.

Grinding process: The pretreated magnesium oxide raw materials enter the grinding stage. The feeding process uses an electromagnetic vibrating feeder to feed the material evenly and stably, and it is necessary to avoid feeding too fast or too slow. Grinding is the core. The grinding roller presses the grinding ring tightly under the action of centrifugal force, and the material is refined into powder under strong rolling. The grinding effect is affected by the gap between the grinding roller and the grinding ring, the grinding roller pressure and the material properties. The classification process uses an analyzer for fine screening, and the speed is the key to controlling the fineness of the finished product. The collection process uses a cyclone collector and a pulse dust collector to recover qualified fine powder to ensure that the exhaust gas meets the emission standards.

Finished product packaging: After magnesium oxide is processed into fine powder, it needs to be sealed and packaged to prevent moisture absorption. Use packaging materials with good moisture-proof properties, such as plastic film bags, composite paper bags, etc., to ensure stable product quality.

Common problems in processing magnesium oxide with Raymond mill

Material adhesion or blockage: After magnesium oxide absorbs moisture, its viscosity increases, and it is easy to adhere to the grinding roller and grinding ring, reducing grinding efficiency, aggravating wear, and shortening equipment life. The material may also be blocked in the pipeline and analyzer, hindering material transportation and classification. Excessive feed humidity will also aggravate this problem. Water evaporates to form water vapor, making the material more moist and increasing stickiness.

Solution: Strictly control the moisture content of raw materials ≤6%, strengthen the monitoring of the drying process, and add drying equipment or extend the drying time if necessary. Add anti-stick coatings, such as polyurethane coatings, to the inner wall of the mill to reduce material adhesion. Clean the grinding rollers and pipes regularly, use professional tools to thoroughly remove the adhered materials, and check the equipment components.

Finished product fineness does not meet the standard: unreasonable speed of the analyzer is a common reason. Too low speed leads to coarse fineness, and too high speed increases energy consumption and costs. Wear of the grinding roller will also affect the fineness. Long-term grinding causes the surface of the grinding roller to be no longer smooth, and the rolling effect is reduced.

Solution: According to the product fineness requirements, reasonably adjust the speed of the analyzer, and find the most suitable speed through experiments. Regularly check the wear of the grinding roller, replace the worn grinding roller and grinding ring in time, and choose products with reliable quality and strong wear resistance.

Production reduction: Air duct blockage is an important reason. The accumulation of materials in the pipeline hinders the air flow and reduces the working efficiency of the mill. Insufficient roller pressure will also reduce production, and the material cannot be fully ground and needs to be ground repeatedly. Uneven feeding also leads to a decrease in production. There is too much or too little material in some areas, which affects the normal operation of the equipment.

Solution: Clean the fan and pipeline powder regularly to ensure that the air duct is unobstructed. Check the hydraulic system to ensure that the roller pressure is stable. Adjust the feeder frequency to maintain uniform feeding. Accurate control can be achieved by installing an automatic control system.

Precautions for processing magnesium oxide with Raymond mill

Explosion-proof measures: Although magnesium oxide is not flammable, it may cause an explosion when it is processed into fine dust and reaches a certain concentration in the air. For this reason, equipment grounding is a basic measure that can lead static electricity into the ground to eliminate explosion hazards.

Dust removal system: Processing magnesium oxide will generate a lot of dust, and it needs to be equipped with an efficient bag dust collector, such as a pulse dust collector. The dust is filtered through the filter bag, and the pulse spray system automatically cleans the dust. The environmental protection department stipulates that the emission concentration is ≤30mg/m³, and the pulse dust collector can easily meet the standard and protect the environment.

Operation protection: Operators face the risk of inhaling MgO dust. Long-term exposure can damage the respiratory tract and cause serious diseases such as pneumoconiosis. Wearing a dust mask is a key protective measure that can filter fine dust.

Conclusion

The process of processing magnesium oxide with Raymond mill covers raw material pretreatment, grinding, finished product packaging and other links. Each step requires technical and experience support. Choosing a suitable Raymond mill can give full play to the advantages of the equipment, improve efficiency and reduce costs according to the type of magnesium oxide (light burning/heavy burning) and fineness requirements.