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A method for preparing rare earth oxides using microwave technology

A rare earth oxide and microwave technology, which is applied in the preparation/processing of rare earth metal oxides/hydroxides, rare earth metal compounds, energy input, etc., can solve the problems of insufficient heat dissipation of water vapor, uneven burning, uneven heating, etc. , to avoid rare earth powder agglomeration, reduce production cost and improve production efficiency

Active Publication Date: 2021-08-17
CHALCO GUANGXI RARE EARTH DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the common burning method has the following disadvantages: First, the burning time is long and the cost is high
According to the burning process, rare earth oxalate or rare earth carbonate starts burning at room temperature and ends at high temperature for 4 hours, lasting for 24 hours. The production cost is high, especially the cost of electricity consumption.
Second, the particle size is uneven and there is overburning
Because rare earth oxalate or rare earth carbonate is heated unevenly during each burning process, water vapor heat dissipation is not sufficient, it is easy to cause powder agglomeration, uneven burning, and even overburning.
[0004] Therefore, the development of new rare earth oxide processing methods will help solve the problems of high energy consumption costs and uneven product quality

Method used

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  • A method for preparing rare earth oxides using microwave technology

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Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing rare earth oxides using microwave technology, comprising the following steps:

[0032] (1) Microwave drying: Put the rare earth oxalate into the microwave equipment, turn on the microwave radiation, the frequency is 915 MHz, raise the temperature to 130 °C at a heating rate of 25 °C / min, microwave drying for 20 min, and the power is 80 KW / m 3 , until the water content of rare earth oxalate is 3%;

[0033] (2) Microwave preheating: Turn on the microwave frequency of 2.45 GHz, raise the temperature to 400°C at a heating rate of 15°C / min, preheat with microwave for 30 minutes, and power 160 KW / m 3 , until the water content of rare earth oxalate is 0;

[0034] (3) Microwave burning: turn on the microwave frequency of 5.80 GHz, raise the temperature to 950 °C at a heating rate of 5 °C / min, and microwave burning for 50 min with a power of 280 KW / m 3 ;

[0035] (4) Gradient air-cooling cooling: During the air-cooling cooling process, the cooling rate ...

Embodiment 2

[0037] A method for preparing rare earth oxides using microwave technology, comprising the following steps:

[0038] (1) Microwave drying: Put the rare earth oxalate or rare earth carbonate into the microwave equipment, turn on the microwave radiation, the frequency is 915MHz, raise the temperature to 150°C at a heating rate of 30°C / min, microwave drying for 10 minutes, and the power is 100 KW / m 3 , until the water content of rare earth oxalate or rare earth carbonate is 3%;

[0039] (2) Microwave preheating: turn on the microwave frequency of 2.45 GHz, raise the temperature to 500°C at a heating rate of 20°C / min, preheat with microwave for 20 minutes, and power 180 KW / m 3 , until the water content of rare earth oxalate or rare earth carbonate is 0;

[0040] (3) Microwave burning: turn on the microwave frequency of 5.80 GHz, raise the temperature to 1000 °C at a heating rate of 10 °C / min, microwave burning for 30 min, and the power is 300 KW / m 3 ;

[0041] (4) Gradient ai...

Embodiment 3

[0043] A method for preparing rare earth oxides using microwave technology, comprising the following steps:

[0044] (1) Microwave drying: Put the rare earth oxalate or rare earth carbonate into the microwave equipment, turn on the microwave radiation, the frequency is 915MHz, raise the temperature to 140°C at a heating rate of 28°C / min, microwave drying for 15 minutes, and the power is 70 KW / m 3 , until the water content of rare earth oxalate or rare earth carbonate is 5%;

[0045] (2) Microwave preheating: turn on the microwave frequency of 2.45 GHz, raise the temperature to 300 °C at a heating rate of 18 °C / min, and microwave preheating for 60 min with a power of 150 KW / m 3 , until the water content of rare earth oxalate or rare earth carbonate is 0;

[0046](3) Microwave burning: Turn on the microwave frequency of 5.80 GHz, raise the temperature to 700 °C at a heating rate of 8 °C / min, microwave burning for 40 min, and the power is 250 KW / m 3 ;

[0047] (4) Gradient a...

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Abstract

The invention relates to a method for preparing rare earth oxides using microwave technology. The method includes steps such as microwave drying, microwave preheating, microwave burning, and air cooling. , Microwave drying at 120-150°C until the water content of rare earth oxalate or rare earth carbonate is 3-5%, preheating in microwave at 300-500°C until the water content of rare earth oxalate or rare earth carbonate is 0, microwave sintering at 700-1000°C for 30-50 min, and finally air-cooled to obtain rare earth oxides. The microwave heating method of the present invention is evenly heated, the process is easy to control, the purity of the rare earth oxide product is ≥99.99%, the particle size D50 is 0.5-2.0 μm, the particle size distribution (D90-D10) / (2D50)≤1, and the specific surface area is 4-7 m 2 / g.

Description

technical field [0001] The invention belongs to the technical field of preparation of rare earth materials, and in particular relates to a method for preparing rare earth oxides by microwave technology. Background technique [0002] my country is a country rich in rare earth resources, and its output ranks first in the world. Rare earth elements have excellent physical, chemical, magnetic, optical and electrical properties due to their special material structure, and have a wide range of uses. They are called strategic elements in the 21st century. With people's continuous research and understanding of the properties and applications of rare earth elements and the advantages of rich rare earth resources and low prices in my country, rare earths are being used in household appliances, daily chemicals, iron and steel metallurgy, petrochemicals, laser technology, superconducting materials, medical treatment, etc. It has been widely used in the fields of health care, agriculture...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/206C01F17/10
CPCC01P2004/51C01P2004/61C01P2006/12C01P2006/80C01F17/206Y02P20/129
Inventor 韦世强娄战荒吴忠何莫国荣张亮玖周慧荣龙江志卢阶主梁壮杨金涛庄辉羊多彦李飞龙马宗云况涛许旭升
Owner CHALCO GUANGXI RARE EARTH DEV CO LTD
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