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Process for recovering rare earth element in waste florescent lamps

A technology of rare earth elements and fluorescent lamps, applied in the direction of improving process efficiency, etc., can solve the problem of not realizing the separation of rare earth elements and other valuable elements, and achieve the effect of reasonable process flow, economical and practical process flow

Inactive Publication Date: 2008-11-19
GUANGZHOU RES INST OF NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the fluorescent powder in the fluorescent lamp contains rare earth elements Eu, Tb, Y and other valuable elements Mg, Sb, Mn, Al, Ba, etc., neither of the above two methods can achieve the separation of rare earth elements and other valuable elements

Method used

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  • Process for recovering rare earth element in waste florescent lamps

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take 100g waste mixed fluorescent powder, 500g NaOH, mix evenly, and alkali melt at 320°C for 2 hours to obtain alkali melt. The alkali melt was stirred and leached with 1000g of water, filtered and washed to obtain 62.5g of water-insoluble matter and alkaline filtrate. Water insolubles are dissolved with 10% hydrochloric acid, filtered to obtain a neutral filtrate, adjust the pH of the neutral filtrate=4, and use P 204 Extraction and separation of rare earth containing Y, Ce, Eu, Tb, Mg, Ba, Sb neutral filtrate to obtain extract and raffinate, extract the extract with 30% HCl to obtain strip extract, and use NH 4 HCO 3 Precipitate, and obtain 60.2g mixed Y, Ce, Tb, Eu rare earth precipitates. Raffinate with NH 4 HCO 3 Precipitate, and obtain 12.3 g of precipitates containing Ba, Mg, and Sb. Adjust the pH of the alkaline filtrate to 3.8, and filter to obtain a manganese-containing filtrate and aluminum hydroxide precipitate. Wash, filter, and calcinate the aluminu...

Embodiment 2

[0017] Take 100g waste mixed fluorescent powder, 300g NaOH, mix evenly, and alkali melt at 400°C for 6 hours to obtain alkali melt. The alkali melt was stirred and leached with 1000g of water, filtered and washed to obtain 68.5g of water-insoluble matter and alkaline filtrate. Dissolve the insolubles in water with 10% hydrochloric acid, filter to obtain a neutral filtrate, adjust the pH of the neutral filtrate to 2.5, and use P 507 Extraction and separation of rare earth containing Y, Ce, Eu, Tb, Mg, Ba, Sb neutral filtrate to obtain extract and raffinate, back-extract the extract with 20% HCl to obtain back-extraction, back-extract with H 2 C 2 o 4 Precipitate, and obtain 88.2g mixed Y, Ce, Tb, Eu rare earth precipitates. Raffinate with NH 4 HCO 3 Precipitate, and obtain 10.5 g of precipitates containing Ba, Mg, and Sb. Adjust the pH of the alkaline filtrate to 5, and filter to obtain a manganese-containing filtrate and aluminum hydroxide precipitate. Wash, filter, and...

Embodiment 3

[0019] Take 100g waste mixed fluorescent powder, 300g KOH, mix evenly, and alkali melt at 500°C for 10 hours to obtain alkali melt. The alkali melt was stirred and leached with 1000g of water, filtered and washed to obtain 68.5g of water-insoluble matter and alkaline filtrate. Water insolubles are dissolved with 10% hydrochloric acid, filtered to obtain a neutral filtrate, adjust the pH of the neutral filtrate to 3.2, and use P 507 Extraction and separation of rare earth containing Y, Ce, Eu, Tb, Mg, Ba, Sb neutral filtrate to obtain extract and raffinate, back extract the extract with 10% HCl to obtain back extract, back extract with NH 4 HCO 3Precipitation, 62g mixed Y, Ce, Tb, Eu rare earth precipitates were obtained. Raffinate with NH 4 HCO 3 Precipitate, and obtain 13.7g of precipitates containing Ba, Mg, and Sb. Adjust the pH of the alkaline filtrate to 3 and filter to obtain a manganese-containing filtrate and aluminum hydroxide precipitate. Wash, filter, and calc...

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Abstract

The invention provides a method for reclaiming a rare earth element from abandoned fluorescent lamp. The invention is characterized in that the method comprises the following steps of: melting fluorescent powder by NaOH or KOH and adding water into an alkali melted substance to produce water insoluble substances and alkaline filtrate; dissolving the water insoluble substances into hydrochloric acid to produce neutral filtrate; extracting the neutral filtrate by P204 or P507 to produce extraction liquid and raffinate; back extracting the extraction liquid by HCl to produce back-extraction liquid, and precipitating the back-extraction liquid by H2C2O4 or NH4HCO3 to produce rare earth precipitate containing mixed Y, Ce, Tb and Eu; precipitating the raffinate by the NH4HCO3 to produce precipitate containing Mg, Ba and Sb; adjusting the pH value of the alkaline filtrate to between 3 and 5 to produce Al(OH)3 precipitate and manganiferous filtrate; washing, filtering and calcining the Al(OH) precipitate to produce alumina; and adding oxalic acid into the manganiferous filtrate to produce manganous carbonate. The method realizes that the rare earth element, Eu, Tb, Ce and Y are separated from Mg, Ba, Ca and other alkaline-earth metals, ensures that resources are comprehensively reclaimed and used, and has the advantages of reasonable process flow, economy and practicality.

Description

technical field [0001] The invention relates to a method for environmental protection and resource comprehensive recycling, in particular to a method for recycling rare earth elements in fluorescent lamps. Background technique [0002] According to the disclosure of the National Electric Light Source Quality Supervision and Inspection Center, China has become the world's largest producer and exporter of energy-saving lamps, which soared to nearly 2.4 billion in 2006, and more than 85% of the world's energy-saving lamps are produced in China. Each energy-saving lamp contains 3g of fluorescent powder, and the activated rare earth ions Eu and Tb used in the fluorescent powder are the most important elements for the development of fluorescent materials. At the same time, the content of Eu and Tb in the earth's crust is very low. If you discard fluorescent lamps at will, it will not only cause environmental pollution, but also cause waste of resources. [0003] At present, there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00
CPCY02P10/20
Inventor 倪海勇
Owner GUANGZHOU RES INST OF NON FERROUS METALS
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