Rotary hearth furnace and method for treating low-rank coal and iron-containing materials

The invention discloses a rotary hearth furnace and method for treating low-rank coal and iron-containing materials. Specifically, the rotary hearth furnace comprises a rotary furnace bottom, a ring-shaped hearth, a first retaining wall, a second retaining wall, a low-rank coal inlet, an iron-containing material inlet, a chain plate device, a pyrolysis oil gas outlet and a reduction product outlet, wherein a pyrolysis area, a reduction area and a discharge area are sequentially formed in the rotating direction of the rotary furnace bottom, a first gap is formed between the bottom end of the first retaining wall and the rotary furnace bottom, a second gap is formed between the bottom end of the second retaining wall and the rotary furnace bottom, and the chain plate device is arranged in the pyrolysis area. Accordingly, the low-rank coal can be utilized comprehensively, pyrolysis oil gas is prevented from being polluted by reducing gas or volatile components generated in the treatment process, and the rotary hearth furnace has at least one of the following advantages of being low in production cost, high in reduction product and pyrolysis oil gas quality, good in economic benefits and the like.