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Equipment and method for preparing rare earth oxide through conventional-microwave combined calcination

A rare earth oxide, conventional technology, applied in the field of conventional-microwave joint calcination to prepare rare earth oxides, to achieve the effects of reducing production costs, overcoming high energy consumption, and improving the technical level of rare earth oxide preparation technology

Pending Publication Date: 2021-01-08
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the development of a conventional heating-microwave heating combined calcination equipment and method for rare earth salts is of great significance for energy saving, emission reduction and production efficiency improvement of rare earth smelting enterprises, and no other reports have been seen so far.

Method used

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  • Equipment and method for preparing rare earth oxide through conventional-microwave combined calcination
  • Equipment and method for preparing rare earth oxide through conventional-microwave combined calcination
  • Equipment and method for preparing rare earth oxide through conventional-microwave combined calcination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] S100: Weigh a certain amount of rare earth oxalate to be calcined and put it into a microwave-permeable sagger 10, and then send it into a conventional continuous heating furnace and slowly heat it to the preset 200°C and keep it warm. During the slow heating and heat preservation process Medium materials will gradually decompose into various low-moisture salts of oxalate, such as neodymium oxalate, which will undergo the following decomposition when heated:

[0042] Nd 2 (C 2 O4) 3 10H 2 O→Nd 2 (C 2 o 4 ) 3 ·8H 2 O→Nd 2 (C 2 o 4 ) 3 ·(8-n)H 2 O,

[0043] The low-moisture oxalate undergoes an endothermic reaction to fully decompose the free and unstable moisture, and then dehumidifies it through the opened dehumidification device 7, and heats it for a preset time before it is released from the oven.

[0044] S200: Send the sagger 10 out of the conventional continuous heating furnace into the walking microwave heating furnace, and the sagger 10 is transport...

Embodiment 2

[0049] S100: Weigh a certain amount of rare earth oxalate to be calcined, put it into a microwave-permeable sagger 10, and send it into a conventional continuous heating furnace and slowly heat it to the preset 170°C and keep it warm. During the slow heating and heat preservation process The medium material will gradually decompose into various low-moisture salts of oxalate, and the low-moisture oxalate undergoes an endothermic reaction to fully decompose the free and unstable water, and then dehumidify through the opened dehumidifier 7, and keep warm until the preset time. It will be released after the set time.

[0050] S200: Send the sagger 10 out of the conventional continuous heating furnace into the walking microwave heating furnace, and the sagger 10 is transported by the stepping conveying device to the superposition of the wave peak and the wave peak of the adjacent magnetron 18, according to It is necessary to set the heating rate and holding time. The low-moisture r...

Embodiment 3

[0053] S100: Weigh a certain amount of rare earth carbonate to be calcined, put it into the microwave-permeable sagger 10, send it into a conventional continuous heating furnace and slowly heat it to the preset 230°C and keep it warm. During the slow heating and heat preservation process The medium material will be gradually decomposed into various low-moisture salts of carbonates, and the low-moisture carbonates will undergo endothermic reactions to fully decompose the free and unstable moisture, and then dehumidify through the opened dehumidifying device 7 and keep warm until the preset time. It will be released after the set time.

[0054] S200: Send the sagger 10 out of the conventional continuous heating furnace into the walking microwave heating furnace, and the sagger 10 is transported by the stepping conveying device to the superposition of the wave peak and the wave peak of the adjacent magnetron 18, according to It is necessary to set the heating rate and holding tim...

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Abstract

The invention discloses equipment and a method for preparing rare earth oxide through conventional-microwave combined calcination. A dehumidifying device communicated with the interior of a conventional continuous heating furnace is arranged at the top and / or the side of the conventional continuous heating furnace of the equipment, the tail end of a continuous conveying device of the conventionalcontinuous heating furnace is connected with the head end of a stepping conveying device of a stepping microwave heating furnace, and thermocouples and a plurality of magnetrons are arranged on the stepping microwave heating furnace at intervals in the axis direction. The thermocouples, the magnetrons and a driving unit of the stepping conveying device are electrically connected with an externally-arranged control device, and saggers capable of allowing microwaves to penetrate through are borne on the continuous conveying device and the stepping conveying device at intervals. The method comprises the steps of conventional heating dehumidification, microwave heating calcination and waste heat release. A rare earth salt is dehumidified through conventional heating, then microwave heating calcination is conducted, the problems that when the rare earth salt is directly heated through microwaves, the wave absorption performance of a low-temperature area is poor, and time consumed for heating materials from room temperature to a decomposition temperature is long can be solved, and the method has the advantages of high preparation efficiency and low energy consumption.

Description

technical field [0001] The invention belongs to the technical field of metallurgical equipment, and in particular relates to equipment and a method for preparing rare earth oxides by conventional-microwave combined calcination with high preparation efficiency and low energy consumption. Background technique [0002] Rare earth oxides have unique optical and physical and chemical properties, and are widely used in advanced ceramic materials, fluorescent materials, catalysis, material doping and other fields. The conventional way to obtain rare earth oxides is to obtain them by calcining rare earth oxalates and carbonates. Calcination mainly includes conventional calcination methods and unconventional calcination methods. Among them, conventional calcination is currently the most widely used, while non-conventional calcination is gradually being developed and utilized because of its fast, efficient and selective heating characteristics. [0003] Conventional calcination mainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/206C01F17/10C01F17/224B01J19/12
CPCC01F17/206C01F17/10C01F17/224B01J19/126C01P2002/72C01P2004/03Y02P20/129
Inventor 尹少华吕鹏张良静彭金辉李世伟张利波
Owner KUNMING UNIV OF SCI & TECH
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