PROCESS AND APPARATUS FOR EXTRACTING BATTERY GRADE LITHIUM FROM BRINE

摘要

Provided are a process and an apparatus for extracting battery grade lithium from brine. The process comprises the following steps: step 1, absorbing the brine with a lithium adsorption agent and then desorbing the lithium adsorption agent with an eluent to obtain a desorption solution; step 2, removing magnesium from the desorption solution to obtain the desorption solution with magnesium removed; step 3, concentrating the desorption solution with magnesium removed, to obtain concentrated brine containing lithium. The apparatus comprises an adsorption desorption device (1), a magnesium-removing device (2), and a concentration device (3), wherein an outlet of the desorption solution of the adsorption desorption device (1) is connected to an inlet of the magnesium-removing device (2), an outlet of the magnesium-removing device (2) is connected to an inlet of the concentration device (3), and an outlet of the concentrated solution of the concentration device (3) is connected to a first precipitation tank (4); the first precipitation tank (4) is also provided with a first sodium carbonate tank (5), and an outlet of the first precipitation tank (4) is also connected to a second solid-liquid separator (6).