Vertical high-temperature microwave device for preparing fluorescent powder

Abstract

The invention discloses a vertical high-temperature microwave device for preparing fluorescent powder. The vertical high-temperature microwave device consists of a closed box, a vertical high-temperature microwave oven, a vibrating feeder and a microwave generator, wherein the vertical high-temperature microwave oven comprises an oven body, a high-temperature microwave cavity, a spiral feeder and a heat-preserving layer; the high-temperature microwave cavity penetrates through central circular holes in upper and lower covers of the oven body, and is provided with a charging hole, a discharging hole, an air inlet, an air outlet and a square hole; the heat-preserving layer is arranged between the high-temperature microwave cavity and the oven body; the spiral feeder is positioned in a cylinder of the high-temperature microwave cavity; a spiral rod are is with an inner ring of a bearing; the spiral rod is connected with a motor-speed reducer; the microwave generator is positioned on the side surface of the vertical high-temperature microwave oven; a square waveguide opening of the microwave generator is positioned at the square hole of the high-temperature microwave cavity. The vertical high-temperature microwave device for preparing the fluorescent powder has the advantages that the device is simple in structure and easy to operate, and can realize continuous production; reaction gas is in countercurrent contact with granular materials in the vertical high-temperature microwave oven, the reaction is complete, and the remarkable technical effects of environment friendliness, energy conservation, quickness and high efficiency are achieved.

Description

technical field [0001] The invention belongs to the preparation technology of rare earth fluorescent materials, in particular to a vertical high-temperature microwave device for preparing fluorescent powder. Background technique [0002] The high-temperature firing method of phosphor powder is a traditional method for preparing rare earth fluorescent materials. The main disadvantages are: 1) The fired product has large grains, high density, and high hardness, and ball milling is usually required; 2) The firing temperature is high and the reaction time is short. Long, the cooling time of the product is long, and the product often has a small amount of intermediate phase in addition to the main crystal phase; 3) Calcination at a higher temperature consumes more energy. The high-temperature microwave solid-phase synthesis technology of phosphor is a method of converting electromagnetic energy into heat energy by using the interaction between microwave electromagnetic field and...

AI Technical Summary

Problems solved by technology

[0002] The high-temperature firing method of phosphor powder is a traditional method for preparing rare earth fluorescent materials. The main disadvantages are: 1) The fired product has large grains, high density, and high hardness, and ball milling is usually required; 2) The firing temperature is high and the reaction time is short. Long, the cooling time of the product is long, and the product often has a small amount of intermediate phase in addition to the main crystal phase; 3) Calcination at a higher temperature consumes more energy

Usually high-temperature microwave firing adopts a bell-type high-temperature microwave oven. In order to achieve continuous production, a horizontal high-temperature microwave tunnel kiln firing equipment has been developed. The main disadvantage is that the contact between the reducing gas and the solid material is insufficient, and the gas consumption is large; The furnace body is not conducive to heat preservation, the heat dissipation is large, and the movement of materials in the horizontal direction increases the energy consumption of the transmission mechanism

Images