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Method for recovering rare earth from waste aluminate green rare-earth phosphor

A rare earth phosphor and aluminate technology, applied in the direction of improving process efficiency, can solve the problems of complex steps, high cost, and low recovery rate of rare earths, and achieve simple steps, low cost, and high recovery rate of rare earths Effect

Active Publication Date: 2014-09-17
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of low rare earth recovery rate, high cost and complicated steps in the existing technology of recovering rare earths from waste aluminate green rare earth phosphors, and to provide a method for recycling rare earths from waste aluminate green rare earth phosphors. The method of recovering rare earths, so that the leaching rate of rare earths can reach more than 93%

Method used

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  • Method for recovering rare earth from waste aluminate green rare-earth phosphor

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Experimental program
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Effect test

Embodiment 1

[0013] Take 20g of waste green rare earth phosphor and 26g of sodium carbonate and mix evenly, put the mixture into an electric furnace whose temperature is raised to 800°C, react for 3 hours, take it out and cool it to 65°C, then grind the roasted product, after grinding The particle size of the calcined product is -100 mesh, and then enter the following steps.

[0014] Take the roasted product and mix it with hydrochloric acid and hydrogen peroxide. The leaching conditions are: leaching temperature 95°C, leaching time 3h, liquid-solid ratio 11:1, hydrochloric acid concentration 1mol L -1 , the hydrogen peroxide is 5% of the leachate volume, and the stirring speed is 300r / min. After the reaction, solid-liquid separation was carried out, and the leachate was analyzed for rare earth content, and the rare earth leaching rate was calculated to be 93.4%.

[0015] Use the oxalic acid solution with a concentration of 600g / L as the precipitant to precipitate the rare earth in the ra...

Embodiment 2

[0017] Take 20g of waste green rare earth phosphor and 20g of potassium carbonate and mix evenly, put the mixture into an electric furnace whose temperature is raised to 800°C, react for 3 hours, take it out and cool it to 75°C, and then grind the roasted product, after grinding The particle size of the calcined product is -100 mesh, and then enter the following steps.

[0018] Take the roasted product and mix it with hydrochloric acid and hydrogen peroxide. The leaching conditions are: leaching temperature 65°C, leaching time 0.5h, liquid-solid ratio 18:1, hydrochloric acid concentration 4mol L -1 , the hydrogen peroxide is 2% of the leachate volume, and the stirring speed is 600r / min. After the reaction, solid-liquid separation was carried out, and the leachate was analyzed for rare earth content, and the rare earth leaching rate was calculated to be 94.1%.

[0019] Use the oxalic acid solution with a concentration of 700g / L as the precipitant to precipitate the rare earth ...

Embodiment 3

[0021] Take 20g of waste green rare earth phosphor and 12g of sodium carbonate and mix evenly, put the mixture into an electric furnace whose temperature is raised to 1000°C, react for 1h, take it out and cool it to 70°C, then grind the roasted product, after grinding The particle size of the calcined product is -100 mesh, and then enter the following steps.

[0022] Take the roasted product and mix it with hydrochloric acid and hydrogen peroxide. The leaching conditions are: leaching temperature 75°C, leaching time 1h, liquid-solid ratio 15:1, hydrochloric acid concentration 2mol L -1 , the hydrogen peroxide is 4% of the leachate volume, and the stirring speed is 400r / min. After the reaction, solid-liquid separation was carried out, and the leachate was analyzed for rare earth content, and the rare earth leaching rate was calculated to be 93.9%.

[0023] Use the oxalic acid solution with a concentration of 800g / L as the precipitant to precipitate the rare earth in the rare e...

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Abstract

The invention relates to a method for recovering rare earth from waste aluminate green rare-earth phosphor. The method sequentially comprises the following steps of carrying out calcination pretreatment on waste aluminate green rare-earth phosphor, leaching out the calcinated product by using hydrochloric acid and hydrogen peroxide and precipitating rare earth with oxalic acid. The method has the advantages of simple process steps, high recovery of rare earth (the leaching rate of rare earth is above 93%) and low cost, and the problem of difficulty in recovering rare earth from waste aluminate green rare-earth phosphor is solved.

Description

technical field [0001] The invention relates to a method for recovering rare earths from waste aluminate green rare earth phosphors, which has the advantages of simple process, high recovery rate of rare earths, and low cost, and solves the difficult problem of recovering rare earths from waste aluminate green rare earth phosphors . Background technique [0002] With the popularization and widespread use of fluorescent lamps, computers, mobile phones, color TVs and other products in daily life, the amount of rare earth phosphors is increasing day by day. For example, from 200t in 1998 to 6000t in 2009, the average annual growth rate is 36.23%. By 2013, the market size of rare earth phosphors will exceed 12,000 tons, of which aluminate green phosphors account for a large proportion and contain indispensable high value-added medium and heavy rare earths such as terbium. If rare earths can be recovered from waste aluminate green rare earth phosphors, it will be of great signif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B7/00
CPCY02P10/20
Inventor 廖春发曾颜亮李啊林焦芸芬
Owner JIANGXI UNIV OF SCI & TECH
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