Can the high-temperature rotary furnace be evacuated for powder calcination?

The high-temperature rotary furnace can be evacuated during powder calcination, and the vacuuming function is one of its important characteristics, playing a key role in multiple aspects:

The function of vacuuming
Preventing oxidation: Powder materials are prone to react with oxygen in the air at high temperatures, leading to oxidation. Vacuuming can effectively remove air from the furnace, reduce oxygen content, prevent material oxidation, and ensure the purity and performance of the material.
Reduce gas interference: Gas has an interference effect on heat transfer, and vacuuming can reduce this interference, making the heat more evenly distributed in the furnace, which is beneficial for the uniform calcination of powder.
Improving product quality: By vacuuming, impurity gases inside the furnace can be eliminated, reducing the impact of impurities on materials, thereby improving the quality and performance of calcined products.

Implementation method of vacuum pumping
Vacuum system: High temperature rotary furnaces are usually equipped with vacuum systems, including vacuum pumps, vacuum valves, vacuum pipelines, and connectors. Gradually establish a corresponding vacuum degree by removing air and other gases from the furnace.
Selection of vacuum pumps: Different types of vacuum pumps can be selected according to process requirements, such as mechanical vacuum pumps (such as rotary vane vacuum pumps, slide valve vacuum pumps, etc.) and molecular pumps. Mechanical vacuum pumps are suitable for initially establishing a vacuum, while molecular pumps can achieve high vacuum levels in oil-free environments.
Vacuum measurement and control: The furnace is equipped with vacuum measuring instruments (such as vacuum gauges) for real-time monitoring of the vacuum level inside the furnace. The operator can adjust the operating parameters of the vacuum pump through the control system based on the reading of the vacuum gauge to maintain the required vacuum degree.

Practical application cases
Metal powder calcination: When calcining metal powders such as titanium powder and nickel powder, vacuuming can prevent metal oxidation and ensure the purity and performance of the product.
Ceramic powder calcination: When calcining ceramic powders such as alumina and silicon nitride, vacuuming can reduce the interference of gas on heat transfer, improve calcination uniformity, and thus obtain high-quality ceramic products.
Special material processing: For some materials that are extremely sensitive to oxygen content and impurities, such as semiconductor materials and sintering of high-purity metal powders, vacuum pumping is an essential key step.