Microwave Calcination Industrial Kiln for Metal Oxide Ores

Microwave Calcination Kiln for Metal Oxide Ores, Microwave Technology Assists Carbon Neutrality

I. Introduction to Microwave Calcination Reduction Application Technology:

Microwave Heating Calcination Reduction of Metal Oxide Ores: The reduction of metal oxides to metals at high temperatures is a crucial process in pyrometallurgy, widely used in ferrous, non-ferrous, and rare metal metallurgy. Many metals such as MgCO₃, Al, Fe, Sn, Zn, Pb, Cr, or Si can be produced using this method. Carbon is extensively employed as a reducing agent in pyrometallurgical reduction processes due to its strong chemical affinity for oxygen, which increases with rising temperatures, indicating enhanced reducing capability at high temperatures. Additionally, carbon is an excellent microwave-absorbing material, capable of being heated to 1053–1566 K in a very short time by microwaves. When microwave heating is applied to the calcination or carbothermal reduction of metal oxides, carbon can generate localized high temperatures, significantly improving its reducing ability and accelerating the reduction process. This greatly reduces carbon dioxide emissions, supporting national carbon neutrality policies. The microwave exhaust treatment capacity is about one-fifth that of conventional pyrometallurgical kilns, strongly promoting the modernization of energy structures by replacing coal with electricity. Microwave heating replaces traditional coal, electricity, and gas heating modes, saving over 30% in energy; for every kilowatt-hour of electricity saved, 0.4 kg of standard coal and 0.997 kg of carbon dioxide emissions are reduced. The era of microwave heating has arrived, and microwave heating is becoming the new heating technology of the 21st century!

II. Application Characteristics of Microwave High-Temperature Industrial Equipment:

Principle of Microwave Calcination Equipment for Metal Oxide Ores: Microwaves refer to electromagnetic waves with frequencies ranging from 300 MHz to 300 GHz. Dielectric materials composed of polar and non-polar molecules, under the influence of a high-frequency microwave electromagnetic field, cause polar molecules to transition from a random distribution to an alignment according to the electric field polarity. The polar molecules in the medium shift from their original thermal motion state to following the alternating microwave electromagnetic field, generating intense friction and producing heat. Microwave energy is converted into thermal energy within the medium, resulting in a macroscopic temperature rise—this is the fundamental principle of microwave heating. Microwave heating is a penetrative internal heating method where electromagnetic energy directly acts on molecular conversion to heat, and its transmissive properties allow simultaneous heating of both internal and external parts of the material without the need for heat conduction. The lack of internal heat dissipation conditions creates a temperature gradient where the interior is hotter than the exterior, forming a pressure differential that drives internal heat or moisture to permeate outward. In contrast, conventional heating methods rely on radiation, convection, and other external-to-internal heat conduction processes, which are energy-intensive, inefficient, slow to heat, and prone to coking, requiring regular furnace cleaning, shutdowns for maintenance, and frequent replacement of temperature- and corrosion-sensitive components.

Characteristics of Microwave Industrial Kilns: Energy-saving (high thermal efficiency conversion, over 30% energy savings compared to traditional heating methods), environmentally friendly (no external emissions, effectively reducing harmful substance generation), clean (materials absorb microwaves and heat themselves, no contact pollution, improving product quality and yield), efficient (fast heating speed, high energy utilization); additionally, microwave industrial equipment produced by Zhongsheng operates at temperatures up to 1600°C, with kiln temperature stability of ±5°C, and can be integrated with automated and intelligent loading and unloading operations, improving the production environment.

III. Distinctive Design Philosophy of Zhongsheng Microwave Equipment Compared to Other Manufacturers:

1) Utilizes microwave antennas for large-area energy feeding to avoid localized overheating caused by concentrated microwaves.
2) Employs wave homogenizing devices in the microwave heating cavity to ensure uniform temperature of heated materials.
3) Uses high-capacity variable frequency fans for dehumidification, ensuring timely removal of moisture from the furnace to prevent condensation; condensed water in the dehumidification pipes is collected and discharged centrally to prevent dripping onto the ground.
4) Incorporates a fully automatic deviation correction mechanism for dynamic adjustment, ensuring the conveyor belt operates within the process tolerance range (±25 mm); uses an automatic tensioning mechanism to prevent belt slippage.
5) Equipped with online microwave leakage detectors at the conveyor belt inlet and outlet, which automatically alarm when microwave leakage exceeds standards; microwave anti-leakage devices ensure leakage does not exceed 1 mW/cm² (national standard is ≤5 mW/cm²), significantly enhancing safety. Includes a handheld microwave leakage detector for随时检测设备周围其他地方的微波泄露量。
6) Features multiple infrared thermometers, with microwave power automatically adjusting based on temperature, allowing strict control of material temperature and ensuring precise temperature regulation across sections of the microwave drying furnace. Combined with variable speed control of the conveyor belt, different process parameters can be adjusted随时 to achieve the desired moisture content in materials.

IV. Services: Technical Exchange / Small-Sample Testing / On-Site Visits / Equipment Ordering

Consultation on Microwave Calcination Reduction Kilns for Metal Oxide Ores: Zhongsheng Manager Xu: 156 74393491

Factory Address: Tonghai Road, Economic Development Zone, Yueyang City, Hunan Province