A method for separating rare earth phosphor from electronic waste powder

Abstract

The invention discloses a method for separating rare-earth fluorescent powder from electronic waste powder. The method comprises the following steps: 1, screening the electronic waste powder, thereby obtaining fine electronic waste particles; 2, conveying the fine electronic waste particles into a fine particle separation device for performing secondary separation, thereby obtaining the materials subjected to secondary separation; 3, performing powder slurry treatment on the materials subjected to secondary separation, allowing the materials to pass through a water sieve, and taking the screen underflow, thereby obtaining wet materials; and 4, sequentially carrying out washing, suction filtration, drying, grinding and screening the wet materials, thereby obtaining the rare-earth fluorescent powder of which the quality purity is not less than 98 percent. According to the method disclosed by the invention, the rare-earth fluorescent powder of which the quality purity is not less than 98 percent can be separated, the mass content of rare earth oxides in the rare-earth fluorescent powder of which the quality purity is not less than 98 percent is not less than 28 percent, the rare earth elements in the rare-earth fluorescent powder can be further conveniently separated by rare-earth purification enterprises, and the method is environmentally friendly, easy and convenient to operate and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of fine particle separation, and in particular relates to a method for separating rare earth fluorescent powder from electronic waste powder. Background technique [0002] With the increasing demand for electronic products in modern life, more and more electronic waste is generated. In order to ensure the dismantling process of e-waste and the lower pollution and recyclability of e-waste, the recyclable utilization of e-waste has become a necessary trend. Electronic waste containing rare earth phosphors is composed of screen cone glass, graphite, rare earth phosphors, aluminum foil, nano-alumina, and dust. Due to the different dismantling methods of electronic waste, traditional methods are used to extract only Rare earth phosphors with a rare earth oxide mass content of only 5% to 10% can be recovered. The particle size of each component in this rare earth phosphor is close, and the specific gravity is not...

AI Technical Summary

Problems solved by technology

Electronic waste containing rare earth phosphors is composed of screen cone glass, graphite, rare earth phosphors, aluminum foil, nano-alumina, and dust. Due to the different dismantling methods of electronic waste, traditional methods are used to extract only Rare earth phosphors with a rare earth oxide mass content of only 5% to 10% can be recovered. The particle size of each component in this rare earth phosphor is close, and the specific gravity is not much different. It is difficult to further separate the components. It is very large, and the mass content of rare earth oxides in the rare earth phosphor cannot meet the requirements of rare earth purification enterprises for the mass content of rare earth oxides in rare earth raw materials to be no less than 20%. At present, there is no mature separation method in the prior art The method can effectively separate rare earth elements from raw materials with low rare earth content. Therefore, the only disposal method for electronic waste containing a small amount of rare earth oxides is to landfill

Since rare earth is a scarce strategic resource, if it cannot be recycled, it will not only cause a large loss of rare earth resources, but also landfill will pollute water sources, soil and vegetation, and produce trace amounts of radiation

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