Dump leaching processing method for waste cathode inner lining of aluminum electrolytic bath

• Main Authors: YANG WANZHANG, LIANG KE, YANG DAJIN, LIU JUNCHANG, ZHANG YAN, JIANG JUN, XU JIAQUAN, CHEN BENSONG
• Format: Patent
• Language: Chinese; English
• Published: 03.11.2017
• Subjects: AMMONIA; APPARATUS THEREFOR; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM; COMPOUNDS THEREOF; CYANOGEN; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY ORREFINING OF METALS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

Disclosed is a dump leaching processing method for a waste cathode inner lining of an aluminum electrolytic bath. The dump leaching processing method comprises the following steps that insulating bricks, castables, anti-leakage materials and carbon materials in the waste cathode inner lining which is sorted from bath residues generated in overhaul the aluminum electrolytic bath are correspondingly crushed and screened, the crushed waste insulating bricks, castables, anti-leakage materials are mixed and then processed, and the carbon materials are independently processed; the processing method of mixed materials of the waste insulating bricks, the castables and the anti-leakage materials is the same with the processing method of the carbon materials, and the processing method comprises the following steps of pre-leaching, dump leaching and washing which are conducted circularly; pre-leached liquid and dump leached liquid of the mixed materials are subjected to oxidative decyanide treatment and then are filter-