Novel method for recycling and preparing battery-grade lithium carbonate from lithium-containing waste residues

• Main Authors: KANG JIANGANG, CHEN DIANHUA, CAO SHENGPING, DONG JIALE, MA RUHAI
• Format: Patent
• Language: Chinese; English
• Published: 07.05.2024
• Subjects: CHEMISTRY; COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM; INORGANIC CHEMISTRY; METALLURGY

The embodiment of the invention provides a novel method for recycling and preparing battery-grade lithium carbonate from lithium-containing waste residues, and relates to the field of lithium carbonate extraction. The invention discloses a novel method for recycling and preparing battery-grade lithium carbonate from lithium-containing waste residues. The novel method comprises the following steps: step 1, carrying out acid leaching and filtering on unqualified lithium carbonate waste residues to obtain lithium-containing leachate; and 2, adding a sodium hydroxide solution into the leachate obtained in the step 1, and adjusting the pH value of the leachate by using the sodium hydroxide solution. According to the method, the lithium-containing solution is added into the carbonate-containing solution by adopting a reverse addition method, the charging time, the reaction temperature and the washing times are controlled, and ammonium carbonate is adopted as a precipitator, so that the introduction of impurity sodi