Separation process of desulfurization slag in steel plant

Abstract

A method for sorting desulfurization slag from a steel plant, the steps of which are: mixing the desulfurization slag intermediate obtained by sieving with the 10-16 mesh component of carbon element with a collector and a foaming agent to form a concentration of 22-27 % slurry, the slurry forms bubbles with a diameter of 8-10mm by means of flotation, and after collecting the bubbles with a diameter of 8-10mm, the desulfurization slag isolate is obtained, which improves the sorting grade of graphite carbon in the desulfurization slag, and improves the Comprehensive utilization of desulfurization residue.

Description

1. Technical field [0001] The invention relates to a sorting method and device, in particular to a sorting process for desulfurization slag in a steel plant. 2. Background Technology [0002] In the production of iron and steel, a large amount of desulfurization slag, that is, steel slag, will be produced. However, the by-product of desulfurization slag has not been utilized, and the accumulated desulfurization slag will pollute the environment. Therefore, the separation process of desulfurization slag in steel plants is an important method in the metallurgical industry. Now there are three main ways to use it, the first way is to use the cupola furnace for secondary smelting to separate, the disadvantage is that the chemical composition of the separated steel (iron) is unstable, there are many impurities, and the sulfur content Severely exceeding the standard, it cannot be used for steelmaking and production of marked castings. This treatment method seriously pollutes the e...

AI Technical Summary

Problems solved by technology

[0002] In the production of iron and steel, a large amount of desulfurization slag, that is, steel slag, will be produced. However, the by-product of desulfurization slag has not been utilized, and the accumulated desulfurization slag will pollute the environment. Therefore, the separation process of desulfurization slag in steel plants is an important method in the metallurgical industry. Now there are three main ways to use it, the first way is to use the cupola furnace for secondary smelting to separate, the disadvantage is that the chemical composition of the separated steel (iron) is unstable, there are many impurities, and the sulfur content Severely exceeding the standard, it cannot be used for steelmaking and production of marked castings. This treatment method seriously pollutes the environment during the production process; the second method is to use multi-stage flange crushing and magnetic separation for separation. This method produces a lot of dust during the production process. The separation is not clean, there are too many impurities and sulfides, and it cannot be used for steelmaking and casting production; the third method is to use the ball mill principle to dry grind and then wash and separate with water. On the one hand, the content of iron impurities and sulfides after separation is high, and the machine wears heavily On the other hand, a large amount of dust is produced during the ball milling process, and the wastewater after washing contains a large amount of sulfide and other substances, which cause serious pollution to the atmosphere and water source environment.

In short, these three methods will pollute the environment, and they cannot classify the desulfurization slag carefully, and separate the various components contained in the desulfurization slag for reuse.