Method for recovering rare earth elements in waste fluorescent powder through ultrasonic enhanced flotation

A rare earth element and phosphor technology, used in flotation, process efficiency improvement, solid separation, etc., can solve the problems of complex waste phosphor composition, low sorting recovery rate, poor sorting effect, etc., to improve flotation effect, reduce environmental harm, improve efficiency

Pending Publication Date: 2022-05-03
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low separation efficiency of the above methods, and it is easy to cause secondary pollution, at the same time, the composition of the waste phosphor is complex and the particle size is too fine, so that the separation recovery rate is low and the separation effect is poor.

Method used

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  • Method for recovering rare earth elements in waste fluorescent powder through ultrasonic enhanced flotation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The waste fluorescent powder recovered from a fluorescent lamp manufacturing enterprise in Zhejiang Province was obtained. Laboratory analysis showed that the rare earth oxide grade was 18.82%, that is, the rare earth oxide content was 18.82%.

[0027] (1) Add 20mL of 0.1mol / L sodium carbonate solution into a 100mL flotation cell, and turn on the ultrasonic device to perform ultrasonic treatment on the sodium carbonate solution.

[0028] (2) Pass the above-mentioned waste fluorescent powder through a 200-mesh sieve to remove large particles of impurities and organic flocs, weigh 10 g of the waste fluorescent powder after sieving and place it in the sodium carbonate solution for ultrasonic treatment in step (1), add water To the scale line of the flotation cell, it is configured as an ore slurry with a mass fraction of phosphor powder of 10%;

[0029] (3) adding sodium carbonate to the pulp to regulate the pH value of the pulp is 9, and ultrasonic treatment is carried ou...

Embodiment 2

[0037] It was taken from unqualified waste powder produced in the production process of a fluorescent lamp manufacturer. Laboratory analysis showed that the rare earth oxide grade was 22.73%.

[0038] (1) Take 20mL of 0.1mol / L sodium silicate solution and add it to a 100mL flotation cell, and turn on the ultrasonic device to perform ultrasonic treatment on the sodium silicate solution.

[0039] (2) Pass the above-mentioned waste fluorescent powder through a 200-mesh sieve to remove large particles of impurities and organic flocs, weigh 15g of the waste fluorescent powder after sieving and place it in the sodium silicate solution for ultrasonic treatment in step (1), Add water to the scale line of the flotation tank, and configure it as a slurry with a mass fraction of phosphor powder of 15%;

[0040] (3) adding sodium carbonate to the pulp to regulate the pH value of the pulp is 10, and ultrasonic treatment is carried out;

[0041] (4) Continue to add 5mL of 5% aluminum chlor...

Embodiment 3

[0048] It was taken from the unqualified waste powder produced by a fluorescent material company in the process of phosphor powder preparation. Laboratory analysis showed that the rare earth oxide grade was 45.10%.

[0049] (1) Add 30 mL of 0.1 mol / L sodium hexametaphosphate solution into a 100 mL flotation cell, and turn on the ultrasonic device to perform ultrasonic treatment on the sodium hexametaphosphate solution.

[0050] (2) Pass the above-mentioned waste fluorescent powder through a 200-mesh sieve to remove large particles of impurities and organic flocs, weigh 5g of the waste fluorescent powder after sieving and place it in the sodium hexametaphosphate solution for ultrasonic treatment in step (1) , add water to the scale line of the flotation cell, and configure it as an ore slurry with a phosphor mass fraction of 5%;

[0051] (3) adding sodium hydroxide to the pulp to adjust the pH value of the pulp to be 8, and carry out ultrasonic treatment;

[0052](4) Continue ...

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Abstract

The invention discloses a method for recovering rare earth elements in waste fluorescent powder through ultrasonic enhanced flotation, which belongs to the technical field of rare earth secondary resource recovery and comprises the following steps: adding a dispersing agent solution into a flotation tank, and carrying out ultrasonic treatment; the sieved waste fluorescent powder is weighed and placed in a dispersing agent solution subjected to ultrasonic treatment, and water is added to prepare ore pulp; adding a pH regulator into the ore pulp to regulate the pH value of the ore pulp to 8.0-10.0, and carrying out ultrasonic treatment; a flocculating agent, an inhibitor and a collecting agent are sequentially added, stirred respectively and subjected to ultrasonic treatment; carrying out air inflation flotation; sequentially filtering and drying the product obtained by flotation to obtain a rare earth element enriched waste fluorescent powder product; according to the method, the rare earth elements in the waste fluorescent powder are separated and enriched by adopting selective flocculation flotation, and the selective flocculation flotation of the rare earth elements in the waste fluorescent powder is enhanced by utilizing ultrasound, so that the efficient separation of the rare earth elements in the waste fluorescent powder is realized.

Description

technical field [0001] The invention relates to the technical field of rare earth secondary resource recovery, and more specifically relates to a method for recovering rare earth elements in waste fluorescent powder by ultrasonic enhanced flotation. Background technique [0002] Rare earth elements have been widely used due to their unique properties. With the increasing demand for rare earth elements and the decreasing primary mineral resources, it is particularly important to recover rare earth elements from secondary resources. Waste fluorescent powder contains about 20% rare earth oxides, which is an ideal raw material for recycling rare earth elements. [0003] Rare earth three primary color phosphors for lamps are made by mixing red powder, green powder and blue powder in a certain proportion. The rare earth elements are usually leached by chemical beneficiation methods such as acid leaching and roasting. Pre-enrichment through sorting can significantly reduce chemical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/00B03D1/002C22B7/00C22B59/00B03D101/00
CPCB03D1/00B03D1/002C22B7/006C22B59/00B03D2201/005B03D2201/007Y02P10/20
Inventor 于明明陈内杨德龙曾玲程明宇
Owner JIANGXI UNIV OF SCI & TECH
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