A method for enhanced leaching of rare earth metals from waste fluorescent powder by mechanical activation

A technology of mechanical activation and rare earth metals, which is applied in the field of solid waste recycling, can solve the problems of difficult industrialization and poor treatment effect, and achieve the effect of increasing leaching activity, reducing activation energy of leaching reaction, and facilitating large-scale industrial production

Active Publication Date: 2017-03-22
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] Research on the recovery technology of rare earth precious metals in rare earth phosphors mainly focuses on the following aspects: wet leaching separation method, direct extraction separation method, alkaline roasting method and supercritical extraction separation method, but there are many technical bottlenecks and environmental problems , it is difficult to achieve industrialization
Hydrometallurgy has the advantages of low processing cost and mature technology, but the phosphor powder has strong chemical stability, and the traditional hydrometallurgy method has poor treatment effect on it.

Method used

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  • A method for enhanced leaching of rare earth metals from waste fluorescent powder by mechanical activation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 4 grams of waste fluorescent powder to the ball milling tank of the planetary ball mill, and then add stainless steel balls (including 24 Φ 9.6mm and 100 Φ 5.6mm stainless steel balls) into the ball milling tank, the mass ratio of material to balls is 1 :80. Set the rotational speed of the ball mill to 250 rpm, the ball milling time to 1 hour, the ball milling mode to run for 15 minutes, stop for 15 minutes, and cycle in turn. After ball milling, the mechanically activated phosphor is obtained.

[0020] The mechanically activated CRT cone glass powder sample was placed in 1.0 mol / L sulfuric acid solution at 80 °C, the liquid-solid ratio was 100:1 mL / g, and the leaching reaction time was 60 min. After the above leaching reaction is completed, the solid-liquid separation of the mixed liquid is realized by filtration.

[0021] After analysis, the leaching rates of rare earth metals yttrium and lanthanum in waste phosphor powder were 80.3% and 8.5%, respectively.

Embodiment 2

[0023] Add 4 grams of waste fluorescent powder to the ball milling tank of the planetary ball mill, and then add stainless steel balls (including 24 Φ 9.6mm and 100 Φ 5.6mm stainless steel balls) into the ball milling tank, the mass ratio of material to balls is 1 :80. Set the rotational speed of the ball mill to 550 rpm, the ball milling time to 4 hours, the ball milling mode to run for 15 minutes, stop for 15 minutes, and then cycle in turn. After ball milling, the mechanically activated phosphor is obtained.

[0024] The mechanically activated CRT cone glass powder sample was placed in 1.0 mol / L sulfuric acid solution at 80 °C, the liquid-solid ratio was 100:1 mL / g, and the leaching reaction time was 60 min. After the above leaching reaction is completed, the solid-liquid separation of the mixed liquid is realized by filtration.

[0025] After analysis, the leaching rates of rare earth metals yttrium and lanthanum in waste phosphor powder were 99.9% and 81.5%, respectivel...

Embodiment 3

[0027] Add 4 grams of waste fluorescent powder to the ball milling tank of the planetary ball mill, and then add stainless steel balls (including 24 Φ 9.6mm and 100 Φ 5.6mm stainless steel balls) into the ball milling tank, the mass ratio of material to balls is 1 :80. Set the rotational speed of the ball mill to 550 rpm, the milling time to 1 hour, the ball milling mode to run for 15 minutes, stop for 15 minutes, and then cycle in turn. After ball milling, the mechanically activated phosphor is obtained.

[0028] The mechanically activated CRT cone glass powder sample was placed in 2.0 mol / L sulfuric acid solution at 80 °C, the liquid-solid ratio was 100:1 mL / g, and the leaching reaction time was 60 min. After the above leaching reaction is completed, the solid-liquid separation of the mixed liquid is realized by filtration.

[0029] After analysis, the leaching rates of rare earth metals yttrium and lanthanum in waste phosphor powder were 95.4% and 76.7%, respectively.

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Abstract

The invention belongs to the technical field of reclamation of solid wastes and specifically relates to a Method for intensified leaching of rare earth metals from waste fluorescent powder by a mechanical activation method. The method comprises the following steps: firstly, sieving waste fluorescent powder (obtained by mechanically crushing waste fluorescent tubes) by a sieve with certain meshes to remove glass fragments out of the waste fluorescent powder; then, mechanically activating the sieved fluorescent powder in a high energy ball mill to obtain activated fluorescent powder; placing the activated fluorescent powder in an inorganic acid solution with certain concentration to leach out rare earth metals under particular conditions; filtering and separating solution sample after the reaction to obtain a solution containing the rare earth metals, so as to recycle the rare earth metals in the waste fluorescent powder. The method is mild in reaction conditions, simple in technological process and high in leaching rate of the rare earth metals out of the waste fluorescent powder.

Description

technical field [0001] The invention relates to the technical field of solid waste recycling, in particular to a method for enhancing the leaching of rare earth metals from waste fluorescent powder through a mechanical activation method. Background technique [0002] Rare earth elements have unique physical and chemical properties and are widely used in electronic products such as fluorescent tubes. Rare earth fluorescent lamps have been widely used in lighting systems in my country. According to reports, in 2005 alone, the output of rare earth fluorescent lamps in my country was about 1.7 billion, and the annual output of trichromatic rare earth phosphors for lamps was 2,500 tons; in 2008 and 2011, the output of rare earth fluorescent lamps in my country was about 3.8 billion and 7 billion respectively. The annual output of base color rare earth phosphors is 5,500 tons and 8,000 tons respectively. Every year, a large number of waste rare earth fluorescent lamps are dispose...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B59/00
CPCY02P10/20
Inventor 苑文仪孟雯张承龙白建峰王景伟陈钦
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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