RE:This client is Rio Tinto ?In regards to Zinc extraction, a current method is through a roasting process. This process involves zinc concentrate which is high in so2. Once the burning has begun the so2 keeps the zinc roasting through constant combustion and fluidized air. To get this process to its combustion stage diesel torches are utilized in conjunction with natural gas burners. The plasma torch would be an optimal replacement for these dinosaur aged initial combustion methods. The sky is the limit for the plasma torch.