Method for recovering lithium from lithium clay

• Main Authors: BAO DONGLIAN, CHEN RUOKUI, NGUYEN DINH SON, QIAO YANCHAO, LI CHANGDONG, LI BO
• Format: Patent
• Language: Chinese; English
• Published: 12.08.2022
• Subjects: CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a method for recovering lithium from lithium clay, which comprises the following steps of: roasting lithium clay powder for the first time, mixing the primarily roasted material with an additive, grinding to obtain a ground material, mixing the ground material with acid, roasting for the second time, adding a leaching agent into the secondarily roasted material, and leaching to obtain a leaching solution. Lithium extraction of the lithium clay is realized on the basis of primary roasting, high-energy grinding and secondary acidification roasting, firstly, structural hydroxyl in the clay ore is removed through primary roasting, so that the lattice spacing of the clay ore is increased, and deintercalation and exchange of lithium ions are facilitated; the structure of the clay ore is further destroyed through high-energy grinding, so that Na < + >/K < + > and Li < + > in the clay ore are subjected to ion exchange; and then the separated lithium is converted into easily-dissolved lithium s