Top slag system of ladle refining furnace

Abstract

The invention relates to a top slag system of a ladle refining system. Aluminum oxide is added based on a binary slag system mainly comprising calcium oxide and silicon dioxide, so that a ternary slag system is formed. The ternary slag system comprises 45%-63% of the calcium oxide, 4%-7% of the silicon dioxide, 22%-30% of the aluminum oxide and the balance magnesium oxide and ferric oxide. The top slag system of the ladle refining system is the ternary slag system and has the advantages that operation is simple, and the practical effect is good; in addition, on the basis that the fluidity of top slag of the ladle refining furnace is guaranteed, slag adjustment through fluorite is not needed, severe corrosion of the fluorite to a steel ladle is avoided, and the service life of the steel ladle is effectively prolonged.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to a ladle refining furnace top slag system. Background technique [0002] Since 2000, the output of crude steel in my country has continued to rise. Even under the planned control of the state, the growth rate has remained above 5%. The output in 2013 and 2014 has reached more than 700 million tons. my country's steel The continuous casting ratio of production has reached more than 95%. In order to stabilize the continuous casting production, ladle refining furnaces have been added to control the temperature, but the original calcium oxide and silicon dioxide content are still used in the refining furnace top slag. Binary slag system has poor fluidity, and needs to add 5-10 kg / ton of fluorite to adjust the fluidity, but fluorite has a strong erosiveness on the refractory material of the ladle, resulting in a low age of the ladle, only 60- 70 times, the existing technology can ...

AI Technical Summary

Problems solved by technology

[0002] Since 2000, the output of crude steel in my country has continued to rise. Even under the planned control of the state, the growth rate has remained above 5%. The output in 2013 and 2014 has reached more than 700 million tons. my country's steel The continuous casting ratio of production has reached more than 95%. In order to stabilize the continuous casting production, ladle refining furnaces have been added to control the temperature, but the original calcium oxide and silicon dioxide content are still used in the refining furnace top slag. Binary slag system has poor fluidity, and needs to add 5-10 kg / ton of fluorite to adjust the fluidity, but fluorite has a strong erosiveness on the refractory material of the ladle, resulting in a low age of the ladle, only 60- 70 times, the existing technology can no longer meet the requirements of production technology. It is necessary to optimize the ladle refining furnace top slag. On the basis of ensuring the fluidity of the slag, fluorite is not used for slag adjustment, so as to increase the ladle age. In view of Therefore, the present invention provides a ladle refining furnace top slag system