公开(公告)号：US20250115487A1

公开(公告)日：2025-04-10

申请号：US18729269

申请日：2023-01-13

Applicant: DOWA ECO-SYSTEM CO., LTD.

Inventor： Chihiro NISHIKAWA ,  Shota TAHATA ,  Ryoei WATANABE ,  Changzhi LIU ,  Shohei YOSHIDA

IPC: C01D15/08 ,  B01D9/00 ,  B01D61/42 ,  H01M10/54

Abstract: Provided is a method of recovering valuable materials that is a method of recovering lithium carbonate from a lithium-ion secondary battery, where the lithium carbonate has a boron content of less than 1 ppm and a calcium content of 100 ppm or less. The method includes a heat treatment step, a crushing and classification step, a slurry formation step, a wet magnetic separation step, an acid leaching step, a neutralization step, a neutralized cake solid-liquid separation step, a calcium carbonate crystallization step, a calcium carbonate solid-liquid separation step, and a calcium adsorption and removal step.