Method for recovering rare earth oxide from fluorescent powder and polishing powder waste

A rare earth oxide and polishing powder technology, which is applied in the field of rare earth resource recycling, can solve the problems of waste of valuable resources, emissions, and low acid dissolution rate of rare earth waste, and achieve the effect of reducing production costs and superior product quality

Inactive Publication Date: 2015-06-10
吴泉锦
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are common problems such as low acid dissolution rate of rare earth waste, and the chemical auxiliary materials used in the recovery of rare earth are finally discharged in the form of ammonia and nitrogen wastewater, resulting in the waste of a large number of valuable resources and serious pollution to the environment.

Method used

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  • Method for recovering rare earth oxide from fluorescent powder and polishing powder waste
  • Method for recovering rare earth oxide from fluorescent powder and polishing powder waste
  • Method for recovering rare earth oxide from fluorescent powder and polishing powder waste

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Rare earth oxides were recovered from rare earth phosphor waste by the following steps:

[0032] (1) Burn 405g of waste using a self-designed burning kiln.

[0033] (2) The filter residue is returned to the dissolved material and continues to dissolve; the filtrate enters the multi-stage extraction tank for rare earth extraction and separation. h 2 SO 4 Add cosolvent to dissolve rare earth waste. Use hydrogen peroxide as cosolvent, glacial acetic acid to adjust acidity (sulfuric acid 87%, hydrogen peroxide 6%, glacial acetic acid 5%), by heating to 90-110 ℃, by the amount of rare earth metal in waste: acid solvent=1: 3, heating and stirring for 3 Hours, the rare earth decomposition rate in the waste material reaches 98.9%.

[0034] (3) Use rare earth-loaded organic as saponified organic, pure rare earth feed liquid as acid washing, and a new fuzzy extraction and separation process that combines back-acid / acid washing parallel flow technology with organic rare earth ...

Embodiment 2

[0038] Rare earth oxides were recovered from polishing powder waste by the following steps:

[0039] (1) Burn 362g of waste using a self-designed burning kiln.

[0040] (2) The filter residue is returned to the dissolved material and continues to dissolve; the filtrate enters the multi-stage extraction tank for rare earth extraction and separation. h 2 SO 4 Add cosolvent to dissolve rare earth waste. Use hydrogen peroxide as a cosolvent, glacial acetic acid to adjust the acidity (92% of sulfuric acid, 7% of hydrogen peroxide, 4% of glacial acetic acid), by heating to 90-110 ° C, according to the amount of rare earth metals in the waste: acid solvent=1: 3, heating and stirring for 3 Hours, make the rare earth decomposition rate in the waste material reach more than 99.2%.

[0041] (3) Use rare earth-loaded organic as saponified organic, pure rare earth feed liquid as acid washing, and a new fuzzy extraction and separation process that combines back-acid / acid washing paralle...

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Abstract

The invention relates to a method for recovering rare earth oxide from fluorescent powder and polishing powder waste, which comprises the following five steps of: (1) firing the waste by using a self-designed firing kiln; (2) dissolving the rare earth waste in H2SO4, glacial acetic acid and cosolvent mixed solution, returning filter residue, and continuously dissolving; and adding filtrate into a multistage extraction tank for rare earth extraction separation; (3) performing extraction separation by a fuzzy extraction separation and purification technology to obtain single rare earth oxide; (4) adding zinc powder into SmEuGd rare earth chloride solution obtained by separation and performing reduction and extraction and purification to produce fluorescent grade europium oxide; and (5) performing ammonia-free saponification to discharge wastewater without ammonia nitrogen. The wastewater is recovered and used for preparing ammonia-free saponification liquid. By the method, the rare earth fluorescent powder and polishing powder waste is recovered in a low-cost and pollution-free mode.

Description

technical field [0001] The invention relates to the technical field of recycling rare earth resources, in particular to a method for recycling rare earth oxides from fluorescent powder and polishing powder waste. Background technique [0002] Rare earth is an important strategic resource for my country's high-tech industry in international competition. my country is the world's largest rare earth consumer, and due to production and use factors, the current domestic production of phosphors, scrapped products, and rare earth-containing polishing powders generate hundreds of thousands of tons of waste. Rare earth waste slag and waste are valuable renewable resources. Recovering rare earth elements from waste is equivalent to opening a medium-scale rare earth mine every year, which is conducive to resource utilization and environmental protection, and is in line with national industrial policies. [0003] At present, the production process for recovering valuable elements from ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/08C22B3/26C22B59/00
CPCY02P10/20
Inventor 吴泉锦
Owner 吴泉锦
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