Desulfurizing slag dust-settling treatment method

Abstract

The invention provides a desulfurizing slag dust-settling treatment method which comprises the following steps: 1) sending a desulfurizing slag tank into a desulfurizing slag cooling field, and cooling by injecting water, wherein the amount of injected water is controlled at 0.2-0.8 time of the volume of the liquid desulfurizing slag in the desulfurizing slag tank; 2) after cooling the desulfurizing slag for 8-12 hours, the surface temperature of the desulfurizing slag is kept at 80-100 DEG C, and the surface is dry and free of dust; 3) overturning the cooled desulfurizing slag on a production bridge in a drop hammer treatment room, and centrally storing the overturned desulfurizing slag; and 4) exploiting the overturned desulfurizing slag, loading on trucks, and transporting to a slag treatment field. After adopting the desulfurizing slag dust-settling treatment method provided by the invention, no phenomenon of haziness among the drop hammers occurs, thereby being beneficial to production safety; and heavy scrap steel in the desulfurizing slag can be separated out, thereby reducing the loss of scrap steel resources and having obvious economic benefit. Meanwhile, the amount of injected water for cooling the desulfurizing slag is only based on the evaporated water, and no wastewater is discharged out, thereby having obvious environmental benefit.

Description

technical field [0001] The invention belongs to the technical field of metallurgical slag treatment and resource utilization, and in particular relates to a desulfurization slag dust reduction treatment method. Background technique [0002] With the development of social and economic construction, users have higher and higher requirements on the types and quality of steel products. Sulfur is a harmful element in steel. To produce high-quality steel, especially special-purpose steel and high value-added steel, the sulfur content in steel must be reduced. Desulfurization and slag removal outside the molten iron furnace is an effective means for system sulfur control. During production, the emission of desulfurization and slag removal accounts for 2%-3% of the emission of ordinary steel slag. In 2011, China's iron and steel industry discharged about 84.5 million tons of steel slag, of which about 2.5 million tons were desulfurized and removed. The slag after desulfurization ...

AI Technical Summary

Problems solved by technology

However, it has been proved by practice that spray dust suppression not only has no effect in the process of desulfurization slag treatment, but also has two major side effects: one is that during the process of turning over the high-temperature desulfurization slag, the dust-falling water mist will be instantly vaporized when it encounters high-temperature desulfurization dust in the air, Desulfurization dust with water vapor is sent to high altitude by hot air, which will better adhere to the plant structure

The second is that when the desulfurization slag is tipped over during dust fall, the flame will rush higher, which may be related to the decomposition of water molecules into oxygen and hydrogen. This point has been proved countless times in practice

As mentioned before, the spray dust suppression method has been proved to be ineffective and has relatively large side effects.

The general dust suction treatment method is suitable for the closed treatment process. The existing desulfurization slag drop hammer treatment environment is a semi-open workshop, which does not have the almost fully enclosed space required for dust suction.