Low-carbon rotary hearth furnace and use method thereof

The invention belongs to the field of metallurgical environmental protection, and relates to a low-carbon rotary hearth furnace and a use method thereof.The low-carbon rotary hearth furnace comprises a heating area, a carbon-based reduction area, a hydrogen-based reduction area and a cooling area which are arranged in fixed furnace walls on the two sides of the rotary hearth furnace and rotate along a rotary furnace plate, and a charging and discharging area is further arranged in the furnace walls between the heating area and the cooling area; partition walls are arranged at two ends of the charging and discharging area, and an exhaust flue is arranged at the top of the heating area. According to the method, a small amount of residual carbon in dust is used as a carbon-based reducing agent, after materials are fed into the furnace, carbon in dust sludge is used for reduction, then coke oven gas or hydrogen is injected to the material surface, gas cools the pellets and meanwhile preheats and cracks to generat