LF slagging process and slagging agent

Abstract

The invention discloses an LF slagging process. The LF slagging process comprises the following steps of heating molten steel; adding calcite particles into the molten steel according to the requiredamount of calcite obtained in advance through calculation; and determining whether the calcite particles need to be continuously added or not by observing the situation of furnace slag, if yes, continuously adding calcite particles into the molten steel, and if not, carrying out a subsequent step. The calcite particles are used as slagging agents. The calcite is a natural mineral, and is free of deliquescence and deterioration, no special storage condition is needed, the use time limit does not exist, and the environment is not polluted. Compared with a traditional mode that a slagging agent and a foaming agent are added separately, the labor amount is reduced, and the processing time is shortened. The CaO slagging agent and the CO2 foaming agent are always added at the same time so that continuous foaming can be ensured, and refining slag with high alkalinity, good fluidity and the good foaming effect can be rapidly formed.

Description

technical field [0001] The invention relates to the field of slagging, more specifically, to a slagging process of an LF refining furnace and a slagging agent. Background technique [0002] In the traditional LF refining furnace slagging process, lime and foaming agent need to be added to the LF refining furnace. The lime enters the LF refining furnace for many times, and the foaming agent usually enters the LF refining furnace twice, and the time points of the two times are the same as the time points when the lime enters the LF refining furnace for the first two times. However, the time limit of the foaming agent is relatively short. After adding lime a few times later, the foaming agent in the molten steel cannot play a good role in foaming, which will affect the adsorption effect of the LF refining furnace on inclusions. In addition, lime for slagging is usually obtained by calcining limestone. Calcining limestone not only increases the processing steps, but also emits ...

AI Technical Summary

Problems solved by technology

Lime is prone to deliquescence and forms calcium hydroxide when it meets water, which leads to failure of lime. Therefore, lime has higher requirements for storage environment.

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