Method for recycling soldering tin from waste circuit board

• Main Authors: CAO QUANHONG, WANG HONGXIA, ZHOU WENBIN, WANG LIN, WANG JIUBIAO
• Format: Patent
• Language: Chinese; English
• Published: 29.06.2016
• Subjects: APPARATUS THEREFOR; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; 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 PRODUCTION, RECOVERY ORREFINING OF METALS; 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 soldering tin from a waste circuit board. The method comprises the following steps that firstly, metal mixed powder containing soldering tin particles is separated from the waste circuit board; and secondly, under the electrolysis condition, the metal mixed powder is added in an electrolysis system with an alkaline solution as an electrolyte, and metallic tin is obtained through the electrolysis reaction. According to the method, the metal mixed powder containing the soldering tin particles is separated from the waste circuit board, the soldering tin can be comprehensively recycled, and the tin recycling rate is increased; the characteristic that the metallic tin can be reacted with the alkaline solution to form tin ions is utilized, the metal mixed powder is added in the electrolysis system with the alkaline solution as the electrolyte, the metallic tin and other metal (such as copper and silver) are separated through the electrolysis reaction, accordingly, spon