公开(公告)号：US12123073B2

公开(公告)日：2024-10-22

申请号：US17442961

申请日：2020-03-23

申请人： Lithium Nevada Corp.

发明人： Brett A. Rabe ,  Ryan M. Ravenelle ,  Rene Leblanc

IPC分类号： C22B26/12 ,  C22B3/08 ,  C22B3/42 ,  C22B26/22

CPC分类号： C22B26/12 ,  C22B3/08 ,  C22B3/42 ,  C22B26/22

摘要： A method of extracting purified lithium sulfate brine from sedimentary rock is disclosed. The method includes the steps of sizing sedimentary rock ore, suspending the sized ore in an aqueous solution, and separating the aqueous solution into lithium bearing slurry and low lithium gangue. The lithium bearing slurry is then treated with an acid, dissolving lithium from the sedimentary rock and forming precipitates which are subsequently removed the slurry, forming an acidic lithium sulfate filtrate solution. The pH of the acidic lithium sulfate filtrate solution is then modified to form further precipitates which are then separated. The neutralized lithium sulfate solution is then crystallized to remove magnesium and potassium, and treated with quicklime, soda ash solution, and/or oxalic acid to form additional precipitates. Finally the additional precipitates are separated from the solution, and the solution is passed through an ion exchange apparatus, forming a purified lithium sulfate brine.