Converter steelmaking fluoride-free composite fluxing medium

Abstract

The invention relates to a converter steelmaking fluoride-free composite fluxing medium, which belongs to the treatment of molten iron alloy by adopting a finishing agent to remove foreign matters. The invention particularly relates to a quick fluxing medium for converter smelting, which consists of the following ingredients in percentage by weight: aluminum oxide (Al2O3): 25 to 45 percent; ferric oxide (Fe2O3): 15 to 35 percent; boron oxide (B2O3): 3 to 10 percent; magnesium oxide (MgO): 5 to 15 percent; calcium oxide (CaO): 3 to 15 percent; and the balance of foreign matters and caking agent. The fluxing medium presents in granular pellets and are filled into a furnace in two times at the beginning of the converter smelting, and 6 to 8 kg of the fluxing medium is added per ton steel. Compared with the prior art, the converter steelmaking fluoride-free composite fluxing medium has the advantages that: no calcium fluoride (CaF2) is contained, so the pollution of the atmosphere and thewater resource caused by the fluoride-contained gas and the fluoride ion can be avoided; the resource of raw materials is abundant, and price of the raw materials is low; the strength of the pellets is high, and the stability is good; the slagging is fast, and the slagging time is advanced about one minute; the whole-process slagging is good, no slag is splashed, no slag is dried, and no slag is adhered onto a gun; and the consumption of the steel is reduced, the consumption of the fluxing material is reduced, and the economic benefit is remarkable.

Description

technical field [0001] The invention belongs to the treatment of molten iron alloys, adding a treatment agent to remove impurities, in particular to a rapid slagging agent for converter smelting. Background technique [0002] Converter slagging is the key operation of converter smelting, and rapid slagging is the core content of converter slagging. The use of slagging agent is an important measure to promote the rapid slagging of the converter. The slagging agent used in the early years contained CaF 2 , whose defect is CaF 2 and SiO in slag 2 Reaction to SiF 4 The furnace gas enters the atmosphere, polluting the air, and fluoride ions dissolve in water, polluting water sources. Currently, many factories use Al 2 o 3 -Fe 2 o 3 Fluorine-free slagging agent, Al 2 o 3 and Fe 2 o 3 Both can promote rapid slagging, but there are two defects: one is Al 2 o 3 It has a high melting point, and it takes a while to melt, and there is a hysteresis in slag melting; the sec...

AI Technical Summary

Problems solved by technology

The slagging agent used in the early years contained CaF 2 , whose defect is CaF 2 and SiO in slag 2 Reaction to SiF 4 Enter the atmosphere with the furnace gas, polluting the air, fluoride ions dissolve in water, polluting water sources

Currently, many factories use Al 2 o 3 -Fe 2 o 3 Fluorine-free slagging agent, Al 2 o 3 and Fe 2 o 3 Both can promote rapid slagging, but there are two defects: one is Al 2 o 3 It has a high melting point, and it takes a while to melt, and there is a hysteresis in slag melting; the second is Al 2 o 3 In alkaline slag, compound anions exist in different forms, and the basic constituent units of this compound anion are many When aggregated, complex complex ions are formed, such as: wait, aggregate The more, the more complex the structure, the larger its radius, so the greater the viscosity of the slag and poor fluidity

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