Fluoride-free slag agent

Abstract

The invention discloses a fluorine-free slagging agent. Bauxite is taken as a main raw material, silica, a fluorine-free iron-containing compound and quicklime are taken as auxiliary materials, and the content of each of effective ingredients of the bauxite is controlled within the following range through the auxiliary materials: Al2O3 accounts for 43-50% of the weight of the fluorine-free slagging agent, SiO2 accounts for 11-13% of the weight of the fluorine-free slagging agent, Fe2O3 accounts for 15-20% of the weight of the fluorine-free slagging agent and CaO accounts for 2-4% of the weight of the fluorine-free slagging agent. The fluorine-free slagging agent disclosed by the invention can solve the harm to an environment caused by a fluorine-containing slagging agent; when the fluorine-free slagging agent is actually used, no slag blocks exist in poured furnace slag, the slag flows, the furnace slag at an end point has no phenomenon of returning to dry state, the slag flow of the poured slag has no iron openwork, and when the slag is poured, the amount of molten iron entrained in the slag is small; and compared with the conventional fluorine-containing slagging agent, by using the fluorine-free slagging agent disclosed by the invention, consumed steel and iron material per ton of steel can be reduced by 4-5kg / t, and the fluorine-free slagging agent is more environment-friendly.

Description

technical field [0001] The invention specifically relates to a fluoride-free slag agent for converter steelmaking. Background technique [0002] In converter steelmaking, after the converter stops oxygen blowing, with the decrease of furnace temperature, some high melting point substances will precipitate and adhere to the converter wall, thus affecting the volume, and it is necessary to use a slagging agent in time to remove it. The commonly used slagging agent Calcium fluoride is usually contained, because calcium fluoride has a low melting point and a small fluoride ion radius, which can improve the fluidity of slag, but it also has disadvantages such as high environmental hazards and strong corrosion because of fluoride ions. Contents of the invention [0003] The purpose of the present invention is to provide a fluoride-free slag agent without fluoride. [0004] To achieve the above object, the present invention adopts the following technical solutions: [0005] A f...

AI Technical Summary

Problems solved by technology

[0002] In converter steelmaking, after the converter stops oxygen blowing, with the decrease of furnace temperature, some high melting point substances will precipitate and adhere to the converter wall, thus affecting the volume, and it is necessary to use a slag remover in time to remove it. The commonly used slag remover Calcium fluoride is usually contained. This is because calcium fluoride has a low melting point and a small fluoride ion radius, which can improve the fluidity of slag. However, because of the presence of fluoride ions, there are disadvantages such as high environmental hazards and strong corrosion.