Microwave Dehydration of Iron Phosphate Hydrate for High Purity

The patent replaces the traditional mechanical thermal convection system (rotary kiln/tunnel kiln) with a microwave irradiation system. The microwave generator emits electromagnetic waves that directly interact with water molecules in the iron phosphate hydrate, causing dielectric heating and rapid vaporization of crystallization water without requiring high-temperature thermal fields, thereby dramatically improving heat transfer efficiency and reducing energy consumption.

The patent utilizes the phase transition of water from solid (crystallization water) to gas (water vapor) through microwave-induced heating. The microwave energy directly excites water molecules, causing them to vibrate and generate heat, which rapidly raises the temperature of crystallization water to its boiling point, facilitating quick phase transition and removal without heating the entire material to high temperatures.

The patent replaces the mechanical thermal processing system with a microwave irradiation system that operates without physical contact between the material and kiln walls. The microwave generator emits electromagnetic waves that penetrate the material and heat it internally, eliminating the need for mechanical rubbing and contact with kiln structures, thereby preventing the introduction of magnetic foreign substances like iron or iron oxide particles.

The patent introduces microwave electromagnetic waves as an intermediary energy carrier to transfer energy to the water molecules in the iron phosphate hydrate. This intermediary mechanism allows for dehydration without direct thermal contact or mechanical interaction with kiln walls, thus avoiding contamination from magnetic foreign substances while maintaining effective water removal.

The patent replaces conventional thermal conduction and convection heating with microwave dielectric heating. The microwave generator emits electromagnetic waves that are directly absorbed by water molecules, converting electromagnetic energy into thermal energy internally within the material. This direct heating mechanism eliminates the need for high-temperature thermal fields and reduces heat loss to the surrounding environment.

The patent enables the iron phosphate hydrate to heat itself through microwave absorption. The water molecules in the material absorb microwave energy and convert it to thermal energy, raising their own temperature and facilitating self-dehydration. This self-heating mechanism eliminates the need for external high-temperature heating sources and minimizes heat loss to the environment.