System and method for disposing dust collection ash of iron and steel plant through mesh belt type suspension combined reduction furnace

Abstract

The invention discloses a system for disposing dust collection ash of an iron and steel plant through a mesh belt type suspension combined reduction furnace. The system comprises a washing dechlorination system, a drying dehydration system, a volatilization zinc extraction system and a flue gas treatment system, wherein the volatilization zinc extraction system comprises a cyclone preheater, the mesh belt type suspension combined reduction furnace, an oxidation chamber, a saline water evaporation and flue gas sedimentation system, a high-temperature electrostatic dust collector and an exhaustfan which are sequentially connected; the mesh belt type suspension combined reduction furnace is composed of a furnace body and a cyclone separator; and the furnace body comprises a rotational flow part, a boiling part, a cooling chamber, a sealing chamber, a high-temperature mesh belt machine and an inflation chamber from top to bottom. The mesh belt type suspension combined reduction furnace isused as main cremation refining equipment, and the equipment is simple and unique in structure, convenient to operate and low in manufacturing 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 system and method for collecting dust in a steel plant by a mesh-belt type suspension combined reduction furnace. 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%, and the lead ...

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Problems solved by technology

[0004] Invention patent CN 106191453B 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 solid-liquid separation of the slurry, 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 a large amount of 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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