Method for comprehensively recovering lithium, rubidium and cesium from lepidolite slag

• Main Authors: WANG YAO, CUI HAO, PENG YUCHEN, HUANG ZHONGXI
• Format: Patent
• Language: Chinese; English
• Published: 11.04.2023
• Subjects: CHEMISTRY; COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM; FERROUS OR NON-FERROUS ALLOYS; INORGANIC CHEMISTRY; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a method for comprehensively recovering lithium, rubidium and cesium from lepidolite slag, which specifically comprises the following steps: S1, roasting and leaching: roasting lithium slag at high temperature, and leaching with water to obtain lepidolite, leachate and No.1 slag; s2, impurity removal and lithium precipitation: adjusting the leachate to be alkaline, removing impurities, separating clear liquid, adding a Na2CO3 solution into the clear liquid for lithium precipitation, and stirring and washing to obtain lithium carbonate; s3, acid leaching, size mixing and filtering are conducted, specifically, the first residues and concentrated sulfuric acid are fully reacted to generate sulfate, water is added for size mixing, then filtering is conducted, obtained tailings are cement raw materials, and obtained leachate is reserved for use; and S4, impurity removal, extraction and reverse extraction: after the leachate is adjusted to be alkaline, calcium removal is carried out, the obt