Under the dual impetus of enhancing the strategic value of rare earth resources and transforming towards green manufacturing, the comprehensive utilization of neodymium-iron-boron waste has become a critical component of sustainable development in the rare earth permanent magnet industry. As the core equipment of the waste pre-treatment system, the technological innovation of the Raymond mill for crushing neodymium-iron-boron waste has significantly improved the recovery efficiency of rare earth elements and the resource conversion value, facilitating the industry's transition from "waste disposal" to "precise regeneration."
Neodymium-iron-boron waste primarily consists of processing scrap, discarded magnets, and production dust, which presents unique material characteristics that impose specific requirements on crushing equipment:
The high hardness (Rockwell hardness HRC 55-60) leads to severe wear in conventional equipment;
The chemical reactivity of rare earth elements is prone to oxidation loss during the crushing process;
The final product particle size must be controlled within the 200-400 mesh range to meet hydrometallurgical requirements. These technical challenges impose triple tests on crushing equipment: wear resistance, sealing performance, and particle size control.
In the comprehensive utilization process of neodymium-iron-boron waste, the Raymond mill achieves breakthroughs through three major technological improvements:
Utilizing high-chromium alloy grinding rollers and curved scraper designs, the wear life is increased threefold compared to traditional equipment, effectively accommodating the high hardness of neodymium-iron-boron waste;
Implementing a nitrogen protection system to control the oxygen content in the crushing chamber to below 5%, reducing the oxidation loss rate of rare earth elements to under 2%;
Innovating a dynamic classification system that allows for continuous adjustment between 80-400 mesh through frequency modulation, significantly enhancing the qualification rate of the final product. Data from a project processing 5,000 tons of waste in a certain year indicated that the optimized Raymond mill system improved the overall recovery rate of rare earth elements by several percentage points while effectively reducing the power consumption per ton processed.
In the construction of neodymium-iron-boron waste comprehensive utilization projects, the selection of the Raymond mill should focus on:
The wear resistance of the equipment materials;
Classification accuracy and flexibility in adjustment;
The reliability of the anti-oxidation system. The Guilin Hongcheng HC series Raymond mill features a three-dimensional structural design, equipped with a pulse dust removal and waste heat recovery system, resulting in lower power consumption compared to traditional models. The classifier employs a forced turbine design with a fineness adjustment accuracy of ±1.5 μm. Its modular construction supports flexible capacity configurations from 1 to 50 tons per hour, particularly suitable for the phased construction needs of neodymium-iron-boron waste comprehensive utilization projects.
A certain rare earth recycling enterprise has established a waste pre-treatment line using the Hongcheng HC1700 Raymond mill, achieving an annual processing capacity of 8,000 tons of neodymium-iron-boron waste. The new Raymond mill has integrated an IoT monitoring system that can real-time monitor key parameters such as roller wear and bearing temperature, providing equipment support for the intelligent upgrade of the neodymium-iron-boron waste comprehensive utilization process.
The Guilin Hongcheng HC series Raymond mill demonstrates unique advantages in the field of neodymium-iron-boron waste comprehensive utilization: the entire machine employs a three-dimensional structure, reducing the footprint by 30% compared to traditional models; the main drive system is equipped with a dilute oil lubrication device, ensuring stable operation under high loads; the classifier features a dual frequency control system, covering a fineness adjustment range of 80-400 mesh; and the innovative sealing structure combined with negative pressure operation effectively controls the escape of rare earth dust. This equipment has passed CE certification, combining efficient production with environmental protection features.
With the implementation of the "Rare Earth Management Regulations," the intelligent transformation of neodymium-iron-boron crushing equipment, such as the Raymond mill, is becoming a new trend in the industry. By integrating online composition detection and automatic adjustment systems, the new generation of equipment has achieved closed-loop control of the "crushing-grinding-classification" process, promoting the comprehensive utilization of neodymium-iron-boron waste towards refinement and high value. This deep integration of equipment and processes is reshaping a new model of circular economy for rare earth resources.
