No-fluorine composite slag melting agent for converter steelmaking and its production process

Abstract

The present invention is one kind of no-fluorine composite slag melting agent for converter steelmaking and its production process. The no-fluorine composite slag melting agent as one kind of steelmaking supplementary material consists of FeO 40-50 wt%, CaO 10-20 wt%, MnO 12-45 wt%, H2O 0.5-1 wt%, MgO 1-8 wt%, Al2O3 and SiO2 1-10 wt%, and impurity for the rest. Its production process includes the steps of compounding, grinding, adding adhesive, stirring, pelletizing, curing and roasting. It is used in no-fluorine steelmaking with less invasion to converter lining, long converter service life, less environmental pollution, low production cost and other advantages.

Description

technical field [0001] The invention belongs to auxiliary materials for steelmaking, in particular to a converter steelmaking slag agent. Background technique [0002] The slagging agent used in existing converter steelmaking, its silicon dioxide SiO 2 If the content is too high, it will increase the total slag in the converter, and if the manganese Mn content is too low, it will affect the amount of Mn at the end point of molten steel. Moreover, due to the addition of calcium fluoride (CaF), fluoride ions will not only seriously erode the furnace lining, but also reduce the service life of the converter lining. Seriously, fluorine ions pollute the environment and endanger human health. In addition, the physical properties of the existing slag-removing agents do not meet the requirements for use. Converter steelmaking brings potential safety hazards. During the steelmaking process, splashing and gun sticking are prone to occur. After the slag remover is put into the furnace...

AI Technical Summary

Problems solved by technology

[0002] The slagging agent used in existing converter steelmaking, its silicon dioxide SiO 2 If the content is too high, it will increase the total slag in the converter, and if the manganese Mn content is too low, it will affect the amount of Mn at the end point of molten steel. Moreover, due to the addition of calcium fluoride (CaF), fluoride ions will not only seriously erode the furnace lining, but also reduce the service life of the converter lining. Seriously, fluorine ions pollute the environment and endanger human health. In addition, the physical properties of the existing slag-removing agents do not meet the requirements for use. Converter steelmaking brings potential safety hazards. During the steelmaking process, splashing and gun sticking are prone to occur. After the slagging agent is put into the furnace, the temperature of molten iron is lowered, which prolongs the smelting cycle.

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