A method for extracting rare earth phosphors from spent cathode ray tubes by using microorganisms
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, comprehensive utilization, and pollution control
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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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