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

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...

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