Digestion device and digestion method for free calcium oxide in converter fly ash

Abstract

The invention relates to a digestion device. The digestion device comprises an on-line digestion hopper and an off-line stacking area, wherein the on-line digestion hopper or the off-line stacking area is selected to be used for digestion according to the content of free calcium oxide in converter fly ash. According to the digestion method, the converter fly ash is transferred into a closed receiving bin and the digestion device, and is subjected to water spraying and dust settling, so that no dust is raised in the whole digestion process of the converter fly ash; different digestion process routes are adopted according to the content of free calcium oxide in the converter fly ash, so that the digestion efficiency is improved; digestion and drying are not needed in sequence, so that the energy consumption required by digestion is greatly reduced; and the digestion method solves the problem that the converter fly ash is prone to cracking during pelletizing or ball pressing, improves theresource utilization of the converter fly ash, brings economic benefits and environmental protection benefits, and improves the solid waste resource utilization rate of steel plants.

Description

technical field [0001] The invention relates to the technical field of dissolving free calcium oxide, more specifically, it relates to a dissolving device and a dissolving method for dissolving free calcium oxide from converter dust removal. Background technique [0002] Iron and steel enterprises will produce dust and sludge containing impurities during the smelting process, especially in the steelmaking process, a large amount of dust and sludge containing impurities will be produced, so a large amount of quicklime is needed as a slagging agent, which also makes the content of calcium oxide in converter dust removal Higher, and the content of zinc element is more than 3%, this kind of converter dedusting ash cannot be returned sintering recycling directly. The processing method of the converter dust removal is generally to make the converter dust removal ash into a ball or a block, and then enter the post-processing process. However, due to the undigested free calcium oxi...

AI Technical Summary

Problems solved by technology

The above two treatment methods have the following defects: 1. The content of free calcium oxide in the converter dust removal ash is not a stable value, and the converter dust removal dust with high free calcium oxide content and the converter dust removal dust with low free calcium oxide content are treated in the same way method, the treatment efficiency is low, and there is a situation of excessive digestion; 2. The converter dust is digested and then dried, and there is a problem of high energy consumption; 3. The dry converter dust is mixed with the wet material, and the degree of mixing is difficult to control. It is easy to cause blockage of mixing equipment and conveying pipes; 4. It is easy to cause secondary dust

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