Deep desulfuration method for magnesium-based composite jetted molten iron

Abstract

The invention discloses a deep desulfuration method for magnesium-based composite jetted molten iron. The deep desulphurization method comprises the following steps of: after the molten iron is fed and subjected to temperature measurement and sampling, scrabbling primary slag before a slag scrabbling station; subsequently desulfurating the molten iron in a magnesium-based composite jetting mode at a jetting and desulfuration station, adding a lean slag modifier in the jetting process and modifying the lean slag of the solid or semi-molten desulfurated slag; subsequently transferring to the slag scrabbling station to carry out primary standing on the molten iron and accomplish middle slag scrabbling; separately jetting lime or calcium carbide at the jetting and desulfuration station so as to carry out deep desulfuration on the molten iron and coagulate and modify residual liquid slag; after the separate jetting, transferring the molten iron tank to the slag scrabbling station to carry out secondary standing on the molten iron and accomplish later slag scrabbling; and after the later slag scrabbling, measuring the temperature, sampling and discharging the molten iron so as to meet the requirements on a molten iron material of a low-sulfur steel. The deep desulfuration method adopts a mode that desulfurated slag of different properties is respectively modified and scrabbled, and has the advantages of simplicity in operation, convenience in application and sufficiency in desulfurated slag modification.

Description

technical field [0001] The invention relates to a molten iron injection desulfurization method, in particular to a magnesium-based composite injection molten iron deep desulfurization method. Background technique [0002] With the rapid growth of market demand for low-sulfur steel and ultra-low-sulfur steel, hot metal desulfurization, which is introduced into production as an important technology, has attracted widespread attention. A large number of metallurgists have conducted extensive research and invented Various forms of hot metal desulfurization methods have been developed, and they have been popularized and applied in actual production. [0003] The affinity between metal magnesium and sulfur is extremely high, and the desulfurization reaction of molten iron is mainly a homogeneous reaction in molten iron. For molten iron, metal magnesium is one of the strongest desulfurizers, so the dosage is small, the amount of slag produced is also small, the iron loss of slag r...

AI Technical Summary

Problems solved by technology

Although this patented technology effectively improves the reaction kinetics of desulfurization slag modification, due to the special multi-layer structure of magnesium-based composite injection desulfurization slag and the significant difference in physical and chemical properties of different slag layers, desulfurization cannot be achieved with one modifier The overall modification of the slag is easy to remove, thus affecting the actual application effect of the patented technology

Due to the unique structural characteristics of the desulfurization slag layer of magnesium-based composite injection desulfurization, this process is not recommended for the production of low-sulfur steel and ultra-low-sulfur steel in some countries with advanced technology, which affects the magnesium-based composite injection desulfurization technology. Further development and application of

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