Method for recovering rare earth from waste cathode ray tube fluorescent powder through microbial leaching

A fluorescent powder and microbial technology, applied in the direction of improving process efficiency, can solve the problems of complex process, high cost, low recovery rate of rare earth, etc., and achieve the effects of simple preparation process, pollution control, and comprehensive utilization

Inactive Publication Date: 2016-08-10
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

Due to the different occurrence states of rare earths in different phosphors, and the different non-rare earth components; although the research on the recovery of rare earths in phosphors has achieved certain results, there are often complex processes, low rare earth recovery rates, high costs, and l

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: A method for extracting rare earth phosphors from spent cathode ray tubes (CRT) by microorganisms. In this embodiment, waste fluorescent powder comes from waste cathode ray tubes. First, the fluorescent powder is dried at 80° C. for 24 hours to a constant weight, and is ground into a 200-mesh fine powder by a grinder. Aspergillus niger was used as the extraction strain, and the medium was sucrose liquid medium. After the medium was sterilized, 5 mL of the prepared Aspergillus niger liquid (about 750 mycelial balls in total) was placed in a medium containing 250 mL of sucrose medium. Into a 500mL Erlenmeyer flask, add 1.25g of sterilized fluorescent powder at the same time. Vibrate at a temperature of 30°C and a rotational speed of 170r / min for 7 days. Take out the triangular flask and vibrate ultrasonically for 2 minutes, let it stand until the liquid is clarified, take out the upper layer of bacteria, take the supernatant and filter it through a 0.22 μm ...

Embodiment 2

[0020] Embodiment 2: A method of using microorganisms to leach rare earth phosphors from spent cathode ray tubes (CRT). In this embodiment, waste fluorescent powder comes from waste cathode ray tubes. First, the fluorescent powder is dried at 80° C. for 24 hours to a constant weight, and is ground into a 200-mesh fine powder by a grinder. Aspergillus niger was used as the extraction strain, and the medium was sucrose liquid medium. After the medium was sterilized, 5 mL of the prepared Aspergillus niger liquid (about 750 mycelial balls in total) was placed in a medium containing 250 mL of sucrose medium. Into a 500mL Erlenmeyer flask, add 3.75g of sterilized fluorescent powder at the same time. Vibrate at a temperature of 30°C and a rotational speed of 170r / min for 7 days. Take out the triangular flask and vibrate ultrasonically for 2 minutes, let it stand until the liquid is clarified, take out the upper layer of bacteria, take the supernatant and filter it through a 0.22 μm ...

Embodiment 3

[0021] Embodiment 3: A method of using microorganisms to leach rare earths from waste cathode ray tube (CRT) phosphors. In this embodiment, waste fluorescent powder comes from waste cathode ray tubes. First, the fluorescent powder is dried at 80° C. for 24 hours to a constant weight, and is ground into a 200-mesh fine powder by a grinder. Aspergillus niger was used as the extraction strain, and the medium was sucrose liquid medium. After the medium was sterilized, 5 mL of the prepared Aspergillus niger liquid (about 750 mycelial balls in total) was placed in a medium containing 250 mL of sucrose medium. In a 500mL Erlenmeyer flask, vibrate culture at a temperature of 30°C and a rotation speed of 170r / min; after Aspergillus niger grows for 3 days, add 1.25g of sterilized fluorescent powder. Vibrate at a temperature of 30°C and a rotational speed of 170r / min for 7 days. Take out the triangular flask and oscillate ultrasonically for 2 minutes, let it stand until the liquid is cl...

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Abstract

The invention relates to a method for recovering rare earth from waste cathode ray tube fluorescent powder through microbial leaching. The method is characterized by comprising the steps of (a), performing pretreatment: drying fluorescent powder until constant weight is achieved, and grinding the dried fluorescent powder with constant weight into fine powder with a grinding instrument for standby application; (b), performing microbe selection and culturing: selecting funguses or bacteria as leaching microbes, and selecting liquid cane sugar culture mediums and beef extract peptone culture mediums as culture mediums for separately culturing the funguses and the bacteria; (c), performing leaching treatment: adding levigated fluorescent powder into the culture mediums containing strains, putting the culture mediums with the levigated fluorescent powder into a vibrating culturing box, performing culturing for some time, performing filtration, obtaining waste slags, collecting thalli, and decomposing the thalli so as to obtain a leaching solution containing rare-earth elements. Through the adoption of the method, not only can the innocent treatment of the waste fluorescent powder be realized, but also rare earth resources can be recovered.

Description

technical field [0001] The invention belongs to the field of hazardous waste treatment and comprehensive utilization, in particular to a method for extracting rare earth elements from waste cathode ray tube (CRT) fluorescent powder by using microorganism wet method. Background technique [0002] CRT phosphors are coated with rare earth phosphors on the inner surface of the cathode ray tube screen glass according to a certain structure. my country is a big country in the production and use of cathode ray tube (CRT) displays, and the output of CRT accounts for about 60% of the total output in the world. According to statistics, there are about 400 million CRT TVs and nearly 20 million computers in China. With the acceleration of updating of electronic products, new displays replace traditional CRT displays, resulting in more and more CRT displays being eliminated. It is estimated that the obsolete numbers of TVs and computers are more than 5 million units each year, and the ...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B59/00
CPCC22B3/18C22B59/00Y02P10/20
Inventor 谌书杨东升严丽娜刘益珍王彬陈梦君刘璟
Owner SOUTHWEAT UNIV OF SCI & TECH
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