Dust escape preventing method for iron adding in 9-nickle steel smelting

Abstract

The invention relates to a dust escape preventing method for iron adding in 9-nickle steel smelting. The dust escape preventing method for iron adding in 9-nickle steel smelting comprises the following steps that (1), dephosphorization furnace semi-steel tapping is conducted by selecting an empty molten iron tank three hours before dephosphorization furnace iron adding, molten iron in the molten iron tank is blended, and the molten iron tank is put under a molten iron tank drying device to be dried for use; (2), the total charging weight of a dephosphorization furnace is 105.7%-106.5% of the nominal capacity of a converter; (3), after blowing of the dephosphorization furnace is finished, the empty molten iron tank is immediately put on a molten iron tank truck, and the molten iron in the furnace is drained out in the steel tapping process of the dephosphorization furnace; and (4), the molten iron in the molten iron tank is completely added into a decarburization furnace, and no molteniron is left in the molten iron tank. The dust escape preventing method for iron adding in 9-nickle steel smelting has the advantages that the decarburization furnace iron adding dust escape problem perplexing dual-process 9-nickle steel production is solved, the steel tapping amount of the dephosphorization furnace is stably controlled, normal production of ultralow-phosphorus species steel is guaranteed, pollution of 9-nickle steel production on the environment is reduced, and the production process of ultralow-phosphorus steel species is rationalized.

Description

technical field [0001] The invention is based on the field of 9-nickel steel smelting, and in particular relates to a dust-preventing method for smelting 9-nickel steel and adding iron. Background technique [0002] Steelworks usually use the double converter process to produce 9-nickel steel. In the decarburization furnace ironing process, due to the low carbon content of the semi-steel, the carbon weight percentage is usually 2.20%, the temperature is controlled at 1400 °C, and there is no slag layer coverage. The liquid surface of molten iron is exposed, and a large amount of red smoke and dust is produced after the iron mixing is completed, causing red smoke to be emitted from the steelmaking plant, and many environmental protection accidents have been caused in the production process of the double-link process. The production of ultra-low phosphorous steel is limited, which affects the implementation of key contracts. Contents of the invention [0003] In order to ov...

AI Technical Summary

Problems solved by technology

[0002] Steelworks usually use the double converter process to produce 9-nickel steel. In the decarburization furnace ironing process, due to the low carbon content of the semi-steel, the carbon weight percentage is usually 2.20%, the temperature is controlled at 1400 °C, and there is no slag layer coverage. The liquid surface of the molten iron is exposed, and a large amount of red smoke and dust is generated after the iron mixing is completed, causing red smoke to be emitted from the steelmaking plant, and many environmental protection accidents have been caused in the production process of the double-link process

Restricted the production of ultra-low phosphorus steel, affecting the implementation of key contracts