Carbon-containing slag suppression cold-bonded pellet and utilization method thereof

Abstract

The invention discloses a carbon-containing slag suppression cold-bonded pellet and a utilization method thereof. In the carbon-containing slag suppression cold-bonded pellet, the TFe content is smaller than or equal to 45%, the carbon content is larger than or equal to 5%, the content of volatile components (including decomposable gas) is larger than or equal to 10%, and the specific gravity is smaller than or equal to 3.5 g / cm<3>. The pellet is added into a converter from a high bin while lance lifting is about to be finished through blowing in the dephosphorization stage of the converter or when lance lifting is about to be finished through the blowing end point of the converter, and then deslagging or tapping is carried out. The carbon-containing slag suppression cold-bonded pellet and the utilization method have the beneficial effects that iron and carbon in gas dust sludge or other iron and carbon containing metallurgy dust sludge can be efficiently utilized, and waste paper pulp, tar slag and other waste are used as additives for pelletizing; the process is simple, and cost is low; the pellet is only used as slag, heat energy of the slag is fully utilized, and the influence of the temperature of molten steel is extremely low; foam slag can be suppressed effectively, and deslagging or tapping in the dephosphorization stage is facilitated; and by means of reduction of FeO in the pellet and FeO in the slag, the yield of the molten steel is increased, consumption of a deoxidizing agent and an alloy is reduced, and slag-splashing furnace protection work is facilitated.

Description

technical field [0001] The invention relates to the field of steelmaking, in particular to cold solidified pellets of metallurgical dust and mud and their utilization in steelmaking. technical background [0002] Metallurgical dust contains a large amount of iron and carbon elements, and the use of it to make carbon-containing pellets has many applications in ironmaking and steelmaking. This kind of carbon-containing pellets can undergo self-reduction reaction to generate CO bubbles, and can make the slag foam when reacting in the slag, which can be used to make foam slag in the electric arc furnace; it can be used as a coolant and a cosolvent in the converter. For example, the one used in the converter has a carbon content of 5-15%, contains TFe50-60%, and has a larger proportion of pellets. The carbon-containing pellets are added during the converter smelting process. When it is added into the furnace as a coolant 1.5-3 minutes before the end point, the TFe content in th...

AI Technical Summary

Problems solved by technology

Converter duplex process is to add thermal coal slag to the converter at the end of the dephosphorization stage, and the cost is relatively high

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