Title:
PROCESSING METHOD
Document Type and Number:
Japanese Patent JP2023011213
Kind Code:
A
Abstract:
To provide a processing method capable of efficiently separating phosphor and heavy metals from an object to be processed at a low cost and suppressing an amount of a waste liquid and an amount of chemical substances to be used.SOLUTION: The processing method repeatedly performs a series of steps including: a first dissolution step of blending an object to be processed with an acidic liquid to obtain a first blending product; a step of performing solid-liquid separation of the first blending product; a step of blending a first liquid separated from the first blending product with a first precipitation agent and elevating its pH to obtain a second blending product; a step of performing solid-liquid separation of the second blending product; a second dissolution step of processing a second solid separated from the second blending product with an alkaline liquid to obtain a third blending product; a step of performing solid-liquid separation of the third blending product; a step of blending a third liquid separated from the third blending product with a second precipitation agent and controlling its pH to 12 or over to obtain a fourth blending product; and a step of performing solid-liquid separation of the fourth blending product, wherein a second liquid is subjected to the first dissolution step, and a fourth liquid is subjected to the second dissolution step for recycling, and an alkaline-earth metal in the second liquid after recycling is recovered as a resource.SELECTED DRAWING: Figure 1
Inventors:
KIM HEEJOON
Application Number:
JP2021114941A
Publication Date:
January 24, 2023
Filing Date:
July 12, 2021
Export Citation:
Assignee:
UNIV NIIGATA
International Classes:
B09B3/70; C01B25/32; C02F1/58; C02F1/62; C02F11/00
Attorney, Agent or Firm:
Tatsuya Masuda
Kazuo Asahi
Kazuo Asahi