Method for joint resourceful treatment of blast furnace bag ash and sintering machine head fly ash

Abstract

The invention is applicable to the technical field of solid waste disposal of iron and steel enterprises, and provides a method for joint resourceful treatment of blast furnace bag ash and sintering machine head fly ash. The method comprises the following steps of: removing chloride ions and alkali metals in the blast furnace bag ash by adopting a wet process; leaching the blast furnace bag ash by adopting a wet process; and removing the chloride ions and alkali metals in the bag ash, wherein the filter residue 1 after removing the chloride ions and alkali metals is used for production and batching of a rotary hearth furnace, the liquid (leachate 1 and filtrate 1) containing the chloride ions and alkali metals is used for treating the sintering machine head fly ash, after removing the chloride ions and alkali metals in the sintering machine head fly ash, the filter residue 2 is also used for sintering or batching of the rotary hearth furnace, and the liquid (leachate 2 and filtrate 2) containing the chloride ions and alkali metals is subjected to purification, impurity removal and evaporative crystallization to produce potassium chloride and sodium chloride products for export sale. The method is simple in process, low in energy consumption, low in production cost and excellent in comprehensive recycling effect, the produced iron ore concentrate (iron-rich material) reaches the grade of the sintered ore, the potassium chloride is used as a raw material of a potassium fertilizer plant, and the sodium chloride is used for producing a snow remover.

Description

technical field [0001] The invention belongs to the technical field of solid waste disposal in iron and steel enterprises, and in particular relates to a combined resource treatment method of blast furnace bag ash and sintering machine head dedusting ash. Background technique [0002] Blast furnace bag ash is the dust discharged along with the gas during blast furnace smelting. The composition of bag ash varies greatly from factory to factory, but the main recovery objects and physical characteristics have common characteristics, mainly manifested as low iron grade and difficult direct utilization. ; The zinc content fluctuates greatly, due to the number of zinc cycles in the blast furnace and the fluctuation of the zinc content in the raw materials, resulting in a large change in the zinc content; the carbon content is relatively high, generally around 20%; the particle size of the material is extremely fine, and forms coarse particles It has the characteristics of high car...

AI Technical Summary

Problems solved by technology

[0015] The invention provides a combined resource treatment method of blast furnace bag ash and sintering head dedusting ash, in order to overcome the defects of high cost and poor effect of the above-mentioned existing treatment methods for blast furnace bag ash and sintering head dedusting ash. A method with simple process, low energy consumption, low production cost, good treatment effect and high comprehensive utilization rate

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