24 Hour direct transit at shanghai

I am a South African national in Thailand at the moment and want to book a flight to Shanghai, from Shanghai back to SA. Will I be able to get a 24 direct transit on arrival and be able to leave the transit area? As I need to pick up some of my luggage left behind a while ago and check them in for my flight back home. The Chinese embassy hasn't been helpful at all with answering my question, not sure they really understand what I'm asking.