I hope you saw the process described. Once you get the lithium chloride crystals, most of us would simply dissolve in water and recrystallize to remove impurities.
The “removal of borates and magnesium” is not described. I would add lime to make calcium borate or magnesium oxide, which precipitate. Then add sodium carbonate.
All this can be done in tanks in a chemical plant. But requires investment to build, labor and energy to operate.
Quality of the brine used matters a lot. What else is in there? It too gets concentrated and where does it go?
I think its the battery electrodes where China really leads. The rest is mostly finance.
Unlike many processes favored by China, lithium is not labor intensive.