Electromagnetic heating rotary kiln with function of controlling reducing atmosphere

Abstract

The invention discloses an electromagnetic heating rotary kiln with the function of controlling reducing atmosphere, and belongs to the field of rotary kilns. The electromagnetic heating rotary kiln comprises a feeding portion, a main kiln portion and a discharging portion. The feeding portion and the discharging portion are in sealed connection to a front port and a rear port of the correspondingmain kiln portion correspondingly. The main kiln portion comprises a core resisting to high-temperature oxidization, a rear-end gas conveying device and a front-end tail gas exhaust device. The coreis made of a Cr-Ni-Mo-W-Fe-Si alloy material. The left portion of the core is lower than the right portion of the core, and a protection cover is arranged on the outer side of the core. A gap is reserved between the core and the protection cover, and an electromagnetic induction heating structure is arranged in the gap. The electromagnetic induction heating structure generates vortexes on the electric conduction core to emit heat, the heat is transmitted to materials turning over in the core, reduction gas is controllably input from the left end of the core through the rear-end gas conveying device under the action of a control system, and then tail gas generated after reacting in the whole core is controllably exhausted from the rear end of the core through the front-end tail gas exhaustdevice under the action of the control system.

Description

Technical field [0001] The invention belongs to the technical field of a rotary kiln, and specifically relates to an electromagnetic heating rotary kiln that realizes real-time control of the reducing atmosphere in the kiln. Background technique [0002] The separation and recycling of heavy metal elements and harmful elements in metallurgical dust and mud are usually treated by rotary kilns. The metallurgical dust and sludge are roasted in the rotary kiln, and a high-temperature chlorination reduction reaction occurs, so that the heavy metal elements and harmful elements in it react to form chlorides or elemental gases that are easy to sublime, which are separated from the metallurgical dust and sludge body, and discharged into the tail gas for separation and recovery. . Most of the existing rotary kilns use ordinary steel materials as the outer shell. Refractory bricks are piled on the inner wall of the outer shell to form the kiln body. The metallurgical dust and mud complete...

AI Technical Summary

Problems solved by technology

The weight of this type of rotary kiln is relatively large, up to 200-600 tons, and the cost of the supporting drive motor and supporting device also increases accordingly. The cost of a complete set of equipment and systems is as high as hundreds of millions of yuan

At the same time, because refractory bricks have been working in a high temperature and corrosive environment exceeding 1000-1200 °C for a long time, after continuous use, most of the refractory bricks are prone to agglomeration on the surface after 3-6 months, which seriously affects the metallurgical dust. The separation and recovery process often requires re-stacking of refractory bricks to ensure the normal operation of the rotary kiln. This kind of maintenance time will take up to half a month or even one month. The shutdown maintenance will cause huge direct economic losses to users.

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