System and method for disposing steel plant collected dust through chain plate type high-temperature reduction furnace

Abstract

The invention discloses a system and method for disposing steel plant collected dust through a chain plate type high-temperature reduction furnace. The system comprises a washing dechlorination system, a pelletizing granulation system, a volatile zinc extraction system and a flue gas treatment system; and the volatile zinc extraction system comprises the chain plate type high-temperature reductionfurnace, an oxidizing chamber, a brine evaporation and flue gas settling machine, a high-temperature static dust collector and a solid storage which are connected in sequence, the high-temperature static dust collector is connected with the chain plate type high-temperature reduction furnace through an exhaust fan, the chain plate type high-temperature reduction furnace comprises a furnace body and a cavity wrapped with the furnace body, and the cavity is composed of an evaporation preheating part, a high-temperature reduction part and a cooling part. The chain plate type high-temperature reduction furnace is utilized as main incineration refining equipment, and the equipment is simple and unique in structure, convenient to operate and low in cost.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste in the metallurgical industry, in particular to a chain-plate type high-temperature reduction furnace disposal system and method for collecting dust in iron and steel plants. Background technique [0002] Dust collected by iron and steel plants includes blast furnace ash, converter ash and electric furnace ash produced by short-process enterprises. The waste production accounts for about 3%-5% of steel output. In 2017, my country's electric furnace steel production capacity reached 140 million tons, about Generate 2.8 million tons of electric furnace dust. The iron content of this dust collection ash usually reaches more than 35-55%. If it is directly returned to the blast furnace for use, zinc circulation and enrichment will occur in the blast furnace, which will endanger the production of the blast furnace; the zinc content in the dust collection dust is 5-30%, an...

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Problems solved by technology

[0004] Invention patent CN 106191453 B discloses a method for recovering zinc concentrate and potassium chloride by using dust from a rotary hearth furnace. In this method, the dust from a rotary hearth furnace is soaked in water first, and then pulped and leached. The final slurry is separated from solid and liquid, and the obtained solid is washed and dried. In this patent, the wet method is used to treat the dust of the rotary hearth furnace, which has low production efficiency and large wastewater discharge.

This method is low in zinc recovery efficiency, and the iron content in blast furnace ash and electric furnace ash is high, and the liquid phase in the kiln is large during calcination, which is easy to agglomerate, which seriously affects the production and operation of the rotary kiln.

[0006] The production efficiency of the above two methods is low, the energy consumption cost is high, and the zinc in the dust collection ash has not been effectively recovered, and secondary pollution is likely to occur during the recovery process

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