Method for recycling rare earth element yttrium from waste fluorescent powder and preparing resin surface composite coating

• Main Authors: WANG HUAIDONG, WU YUFENG, TAN ZHE, CHEN XI
• Format: Patent
• Language: Chinese; English
• Published: 07.12.2016
• Subjects: APPARATUS THEREFOR; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; FERROUS OR NON-FERROUS ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; PRODUCTION AND REFINING OF METALS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a method for recycling rare earth element yttrium from waste fluorescent powder and preparing a resin surface composite coating, and belongs to the field of solid waste resource utilization. The method comprises the following steps of: mechanically crushing a waste CRT fluorescent screen and screening the crushed waste CRT fluorescent screen through a screen with certain mesh number to remove impurities such as glass, thereby obtaining fluorescent powder oriented powder; carrying out oxidizing and acid-leaching treatment on the screened fluorescent powder, and leaching out rare earth elements in the fluorescent powder; extracting most of yttrium and a small part of europium through a multi-stage extracting method, reversely extracting to obtain a yttrium chloride solution, and regulating the pH value of the yttrium chloride solution until white precipitates just appear; adding the yttrium chloride solution into an ammonium hydrogen carbonate solution containing a dispersing agent drop