Zimbabwe, Africa’s top lithium producer and the world’s sixth-largest lithium miner, is looking to boost its economy with higher-value lithium by refining the raw material to battery-grade lithium. Four large-scale producers of lithium concentrate have already submitted plans to refine the raw material locally, instead of shipping it to China, whose lithium companies dominate the lithium extraction industry in Zimbabwe, according to a senior government official in the African country. “They are coming forward with…