Direct Reduced Iron Powder Sponge Iron Special Grinding Mill Nitrogen Protection Crusher

Specialized Grinding Machine for Reduced Iron Powder (Sponge Iron) with Nitrogen Protection Crusher

In the processing of reduced iron powder (sponge iron), due to its high reactivity and susceptibility to oxidation or even combustion, crushing and grinding are typically conducted under the protection of inert gases such as nitrogen. Specialized nitrogen-protected crushers effectively prevent contact between iron powder and oxygen during processing, ensuring safety and product quality. The following are key aspects of related equipment and technology:

Key Requirements for Nitrogen-Protected Crushers

- Inert Gas Protection: The crushing chamber is continuously filled with high-purity nitrogen (N₂) to ensure oxygen levels remain below the safety threshold (typically <1000ppm).

- Explosion-Proof Design: Equipment must comply with explosion-proof standards (such as ATEX or GB standards) to prevent combustion caused by friction or static electricity.

- Cooling System: Heat generated during crushing requires cooling devices (such as water-cooled jackets or low-temperature nitrogen circulation) to control temperature.

- Sealing: Dynamic sealing technology (e.g., mechanical seals combined with gas seals) is employed to prevent air infiltration.

Features of Sichuan Zhongjin Powder Equipment Nitrogen-Protected Crusher:

The inert gas-protected crushing and grading machine utilizes fluid dynamics simulation software to calculate appropriate flow fields and ideal pressure distributions, guiding the design and optimizing the grading impeller structure. The flow field is uniform and stable, with minimal pressure loss in the impeller, enabling precise material grading.

◆ Wide applicability: Suitable inert gases can be selected as protective gases based on the characteristics of flammable, explosive, or easily oxidized powders.

◆ Purity of inert gases can be controlled according to process and product requirements.

◆ Closed-loop circulation system ensures minimal loss with reusable inert gases.

◆ Grading blades are formed in one piece and balanced to ensure smooth operation.

◆ The entire system adopts PLC automatic control, enabling automatic replenishment and discharge of inert gases to maintain system pressure balance, achieving one-click start/stop operation.

◆ Increased filter area in the dust collector, combined with a pulse cleaning system, ensures long-term stable operation; high-quality filter materials ensure collection efficiency ≥99.99%.

◆ Equipped with airflow regulating valves and stepless speed regulators for the grading impeller, allowing adjustment of product particle size without shutdown.

◆ Unique flow field design and constant gas-solid concentration control minimize material residence time in the chamber.

◆ High product precision with minimal large particles observed under electron microscopy, providing strong grading effects for ultrafine powders.

◆ Inert gas recycling ensures oxygen content remains within 100-5000 PPM during production (depending on material characteristics, on-site inert gas purity, flow rate, and pressure).

◆ All flange connections adopt standard flanges, ensuring tightness, high strength, and excellent sealing.

◆ For materials prone to adhesion after crushing, manhole doors can be installed at critical points for easy manual cleaning during shutdowns.

Application Areas

This series of machines is primarily used in research institutes, metal powder processing, chemical, pharmaceutical ultrafine powder, and other fields. The series operates stably, safely, and reliably. Typical materials include titanium alloy, sulfur, cobalt powder, tungsten powder, iron powder, nickel powder, neodymium iron boron, carbonyl iron powder, selenium powder, and various powder metallurgy applications.