A kind of 9 nickel steel smelting and mixing iron to prevent dust escape

Abstract

The present invention relates to a kind of 9-nickel steel smelting and iron mixing method for preventing dust emission, comprising the following steps: 1) 3 hours before adding iron in a dephosphorization furnace, select an empty iron ladle for semi-steel tapping of the dephosphorization furnace, and place the iron in the ladle The molten iron is mixed and placed under the molten iron tank for baking for later use; 2) The total charge weight of the dephosphorization furnace is 105.7% to 106.5% of the nominal capacity of the converter; 3) After the blowing of the dephosphorization furnace is completed, immediately place the empty iron tank On the molten steel tank car, the molten steel in the furnace is cleaned during the tapping process of the dephosphorization furnace; 4) All the molten iron in the molten iron tank is mixed into the decarburization furnace, and no molten iron is left in the molten iron tank. The advantages of the present invention are: solve the dust problem of decarburization furnace mixing iron in the production of 9-nickel steel in the double-link process, stably control the steel output of the dephosphorization furnace, ensure the normal production of ultra-low phosphorus variety steel, reduce the The pollution caused by the production of 9-nickel steel has streamlined the production process of ultra-low phosphorus steel.

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