METHOD FOR RECOVERING LITHIUM FROM WASTE LITHIUM BATTERY

• Main Authors: HAYASAKA ATSUSHI, KOZAKI HIROSHI
• Format: Patent
• Language: English
• Published: 26.01.1993
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; INORGANIC CHEMISTRY; METALLURGY; PRETREATMENT OF RAW MATERIALS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PURPOSE:To recover a high-purity lithium salt by adding water to the roasting slag of batteries contg. lithium and filtering out undissolved residues. CONSTITUTION:Sheath metals are removed from the batteries contg. the lithium by roasting, grinding and sieving the batteries. The pH of the resulted roasting slag is adjusted to >=9.0 by adjusting the water thereto. The undissolved residues are thereafter screened out by heating and agitating. The high-purity lithium salt is selectively recovered in this way. Calcium chloride of the amt. equiv. to the amt. of the silica contained in the lithium salt is added to the lithium salt and the silica is filtered away if the lithium salt contains the silica. The lithium useful as a resource is selectively recovered in this way.