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Continuous and dynamic reduction device and method of fluorescent powder

A fluorescent powder and dynamic technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of uneven distribution of temperature and reducing gas, inability to meet the requirements of phosphor powder preparation, and slow temperature rise and fall, so as to facilitate mass transfer and heat transfer, fast heating and cooling speed, sufficient and uniform contact

Active Publication Date: 2010-09-15
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. When using a traditional resistance furnace for heating, the maximum heating temperature for long-term use should not exceed 1500 ° C, which cannot meet the requirements for the preparation of phosphors with high melting point systems such as aluminates
[0005] 2. When using a resistance furnace for heating, the heat energy is released to the entire space, which requires very strict insulation measures, and the temperature rises and falls slowly, causing unnecessary energy loss and increasing production costs
[0006] 3. The distribution of temperature and reducing gas is uneven, and the consistency of the product is poor
[0007] 4. It is necessary to open the furnace door intermittently and frequently for feeding and discharging, and the degree of automation is low

Method used

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  • Continuous and dynamic reduction device and method of fluorescent powder
  • Continuous and dynamic reduction device and method of fluorescent powder
  • Continuous and dynamic reduction device and method of fluorescent powder

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Firing to 20kgBa in a vacuum environment 0.93 MgAl 10 o 17 :Eu 2+ 0.07 Blue phosphor. Before the operation starts, such as figure 1 , figure 2 with image 3 All equipment and valves are shown closed. The operation steps are as follows:

[0042] 1. According to the stoichiometric ratio, weigh the corresponding weight of BaCO 3 , MgO, Al 2 o 3 and Eu 2 o 3 , ball milled for 48 hours and mixed evenly;

[0043] 2. Open the valve 2 a Feed 10kg, then close valve 2 a ;

[0044] 3. Open the valve 4 a ,6 a and 10 a ; Start the vacuum equipment 5 so that the internal air pressure of the feeding device 1, body of furnace 9 and quenching device 11 drops to -3Pa, then close the valve 4 a ;

[0045] 4. Start the transmission equipment 8 of the rotary kiln type reaction vessel 8 a , the inclination angle between the rotary kiln type reaction vessel and the ground is 1°, and the rotation speed is 1.1 rev / min;

[0046] 5. Turn on the circulating cooling water out...

Embodiment 2

[0054] Firing to 20kgBa in a vacuum environment 0.93 MgAl 10 o 17 :Eu 2+ 0.07 Blue phosphor. Manufacturing steps 1-7 and 9-11 are similar to embodiment 1, except that an empty container 24 is placed in step 8, and the quenching medium is a vacuum environment at this time, and embodiment 2 is obtained.

Embodiment 3

[0056] Use with 75% H 2 H 2 and N 2 Mixed atmosphere firing 20kgCe 0.69 MgAl 11 o 19 :Tb 3+ 0.31 Green fluorescent powder, and the waste gas after use needs to be purified and recycled, before the operation starts, such as figure 1 , figure 2 with image 3 All equipment and valves are shown closed. The operation steps are as follows:

[0057] 1. According to the stoichiometric ratio, weigh the corresponding weight of CeO 2 , MgO, Al 2 o 3 and Tb 4 o 7 , ball milled for 48 hours and mixed evenly;

[0058] 2. Open the valve 2 a Feed 10kg, then close valve 2 a ;

[0059] 3. Open the valve 4 a ,6 a and 10 a ; Start the vacuum equipment 5 so that the internal air pressure of the feeding device 1, body of furnace 9 and quenching device 11 drops to -3Pa, then close the valve 4 a and 6 a ;Open valve 12 a , into the prepared 75% H 2 H 2 and N 2 Mixed gas so that the internal air pressure of body of furnace 9 and quenching device 11 is 1.05 atmospheric pressu...

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Abstract

The invention relates to a device and a method for continuously and dynamically reducing and firing low-valent metal ion activated fluorescent powder under high-temperature and vacuum environment or controllable non-oxidizing atmosphere. The device comprises a sealable furnace body, a vacuumizing device, a controllable non-oxidizing gas generation device, a medium frequency induction heating device, a rotary kiln type reaction vessel, a continuous feeding device, a waste gas purification treatment device and a quenching device. The fluorescent powder manufactured by adopting the method and the device has the advantages of high brightness, narrow particle size distribution and good consistency. The method comprises the following steps of: (1) preparing materials; (2) generating vacuum or non-oxidizing gas environment in the furnace body; (3) carrying out medium frequency induction heating with the heating temperature of 1000 to 2000 DEG C; (4) enabling the materials to flow into the rotary kiln type reaction vessel continuously, dynamically roasting for 2 to 15h, automatically flowing into a certain medium of vacuum, non-oxidizing gas, water or oil for carrying out quenching treatment; and (5) treating the materials to obtain the product.

Description

technical field [0001] The invention relates to a device and a method for continuously and dynamically reducing and firing low-valence metal ions to activate fluorescent powder in a high-temperature vacuum environment or a controllable non-oxidizing atmosphere. The specific content includes the use of sealable furnace body, vacuum equipment, controllable non-oxidizing gas generation device, medium frequency induction heating device, rotary kiln reaction vessel, continuous feeding device, exhaust gas purification treatment device and quenching device to achieve continuous dynamic The process of reducing and roasting phosphor materials and quenching and rapid cooling to prepare phosphor polycrystals with high brightness, narrow particle size distribution and good consistency. Background technique [0002] The activated ions of most of the blue, green and yellow and some red phosphors of tri-color energy-saving lamps, white light diodes, plasma flat panel displays and backlight...

Claims

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Application Information

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IPC IPC(8): C09K11/08
Inventor 刘荣辉庄卫东黄小卫何华强胡运生李玉海
Owner GRIREM ADVANCED MATERIALS CO LTD
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