The recirculation combustion system is installed in the exhaust stream of a combustion chamber to increase exhaust cleanliness and thermal efficiency. The system directs hot exhaust gases through a filtering system to remove the larger particulate materials and pollutants, and then return the gas back to the combustion chamber. This system includes a baghouse unit, a molten metal reactor system with automatic feed and waste removal, a separator system, an active exhaust stack and recirculation line control system, and an automatic oxygen and recirculation gas mixing system.