Skar
Regular
As long as they have a monopoly (or most of the purchasing power) on the chemical production/conversion, of course they can. Thats why non-china supply chains are so important. Think about how Woolies and Coles treat farmers, its a similar power dynamic.China can't keep flooding its market indefinitely with nasty lepidolite in order to manipulate the price of imported product. There will be a time soon when the liabilities associated with the extraction and processing of this low grade material cannot be further absorbed by provincial budgets and processors...and then prices will change virtually overnight.
They can stock up supply at "real market rates", then not buy and push the market into a supply glut and buy at the low prices... problem is thats not sustainable which is why we see such extreme commodity cycles or as Mr Lithium Lowry says "high prices fix high prices, low prices fix low prices". Without new entrants and exploration the market will quickly get constrained again, especially as demand increases.