Processing method for decarbonization of blast furnace molten iron based on converter LT dust-removing ash

Abstract

The invention relates to a processing method for the decarbonization of blast furnace molten iron based on converter LT dust-removing ash. The method includes the steps that the converter LT dust-removing ash, as a decarbonizer, is mixed with the molten iron from a blast furnace to oxidize the molten iron to achieve the decarbonization of the molten iron, so as to reduce carbonaceous dust producedby the drop of the temperature of the molten iron. The processing method for the decarbonization of the blast furnace molten iron based on the converter LT dust-removing ash lowers the content of carbon in the molten iron by adding the converter LT dust-removing ash as the decarbonizer to the molten iron from the blast furnace, so as to fundamentally solve the graphite dust pollution problem caused in the molten iron backward-pouring process in a steel plant. The decarbonizer is the converter LT dust-removing ash from a steel mill. The converter LT dust-removing ash has obvious effect on decarbonizing the blast furnace molten iron, and reduces the content of carbon separated out of the molten iron, so as to alleviate the problem of the graphite dust pollution in the steel mill. Therefore,waste resources are fully used, iron from the converter LT dust-removing ash is recovered, and the utilization value of the converter LT dust-removing ash is improved.

Description

technical field [0001] The invention belongs to the technical field of molten iron pretreatment in the steelmaking process, and in particular relates to a blast furnace molten iron decarburization treatment method based on converter LT dedusting. Background technique [0002] The energy consumption and environmental load of iron and steel enterprises are closely related to the technological process required for production. On the basis that the current steel production process is basically becoming mature and stable, continuous improvement of the "interface" technology between equipment is an effective measure to optimize production indicators. Among them, the "interface" between the blast furnace and the converter (mixed iron furnace) is particularly important, and is usually called the "iron-steel interface". The "iron-steel interface" includes many links such as molten iron from the blast furnace, transportation of molten iron, and pretreatment. During this process, the...

AI Technical Summary

Problems solved by technology

Although this technology has achieved remarkable results in decarbonizing molten iron, there are still the following problems: (1) it uses iron concentrate powder as a decarburizing agent, and the cost is relatively high; (2) it directly adds iron at room temperature to the molten iron Diantan slag powder causes the temperature of molten iron to drop by about 20°C, resulting in a large heat loss and aggravating the generation of carbon-containing dust

(3) When iron concentrate powder is used on site, the Diantan mineral powder packed in woven bags is manually added to the iron trench when the molten iron comes out of the blast furnace, which will easily cause molten iron splashing, material loss and potential safety hazards

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