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Fluorine-free efficient dephosphorizing agent for pretreatment of chromium-containing molten iron

The technology of molten iron pretreatment and dephosphorization agent is applied in the field of iron and steel metallurgy, which can solve the problems of low dephosphorization rate, difficulty in slag removal, environmental pollution of dephosphorization agent, etc. The effect of improving slag fluidity

Inactive Publication Date: 2019-06-07
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] Aiming at the problems in the prior art of blast furnaces using lateritic nickel ore in the dephosphorization process of chromium-containing hot metal, such problems as difficult slag removal, low dephosphorization rate, and environmental pollution caused by dephosphorization agents, the present invention provides a high-efficiency chromium-containing hot metal with less fluorine Pretreatment dephosphorization agent, the dephosphorization agent is a simple and efficient chromium-containing hot metal pretreatment dephosphorization slagging agent, which can meet the pretreatment requirements of chromium-containing hot metal produced after using laterite nickel ore in blast furnaces, and effectively reduce the chromium content. The phosphorus content in molten iron can reduce the amount of fluoride added in the dephosphorization agent while ensuring the slag effect, thereby reducing environmental pollution

Method used

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  • Fluorine-free efficient dephosphorizing agent for pretreatment of chromium-containing molten iron

Examples

Experimental program
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Effect test

Embodiment 1

[0044] In this embodiment, the mass percentages of the components of the dephosphorization agent for chromium-containing molten iron are: 6% CaO, 20% BaCO 3 , 50.5% Fe 2 o 3 , 12.5% ​​CAF 2 , 5%Cr 2 o 3 , 6% CeO 2 .

[0045] Such as figure 1 As shown, the powders of the above components are mixed according to the set ratio to make slag. Put pig iron (by mass percentage, [%C] = 4.23%, [%P] = 0.130%, [%Cr] = 0.25%, [%Si] = 0.34%) into the alumina crucible, the outer graphite crucible Put it into the muffle furnace and raise the temperature to 1400°C, and pass it into the argon gas protection until the pig iron is completely melted, then add the slag to the molten iron at a mass ratio of 1:5, stir it with a steel rod every 5 minutes, and keep it warm After 25 minutes, the crucible was taken out, placed in cooling water and rapidly cooled to room temperature.

[0046] The chemical analysis of the iron sample shows that after dephosphorization treatment, the silicon conten...

Embodiment 2

[0048] The basic content of this embodiment is the same as that of Example 1, except that in this embodiment, the mass percentages of the components of the dephosphorization agent for molten iron containing chromium are: 6% CaO, 20% BaCO 3 , 50.5% Fe 2 o 3 , 12.5% ​​CaF 2 , 5%Cr 2 o 3 , 6% La 2 o 3 .

[0049] Mix the powders of the above components according to the set ratio to make slag. Add pig iron (by mass percentage, [%C]=3.81%, [%P]=0.120%, [%Cr]=0.25%, [%Si]=0.31%) into the alumina crucible, and coat the graphite crucible Put it into the muffle furnace and raise the temperature to 1400°C, and pass it into the argon gas protection until the pig iron is completely melted, then add the slag to the molten iron at a mass ratio of 1:5, stir it with a steel rod every 5 minutes, and keep it warm After 25 minutes, the crucible was taken out, placed in cooling water and rapidly cooled to room temperature.

[0050] The chemical analysis of the iron sample shows that after...

Embodiment 3

[0052] The basic content of this embodiment is the same as that of Example 1, except that in this embodiment, the mass percentages of the components of the dephosphorization agent for molten iron containing chromium are: 6% CaO, 20% BaCO 3 , 50.5% Fe 2 o 3 , 12.5% ​​CaF 2 , 5%Cr 2 o 3 , 6%Li 2 CO 3 .

[0053] Mix the powders of the above components according to the set ratio to make slag. Add pig iron (by mass percentage, [%C] = 4.26%, [%P] = 0.16%, [%Cr] = 0.25%, [%Si] = 0.32%) into the alumina crucible, the outer graphite crucible Put it into the muffle furnace and raise the temperature to 1400°C, and pass it into the argon gas protection until the pig iron is completely melted, then add the slag to the molten iron at a mass ratio of 1:5, stir it with a steel rod every 5 minutes, and keep it warm After 25 minutes, the crucible was taken out, placed in cooling water and rapidly cooled to room temperature.

[0054] The chemical analysis of the iron sample shows that a...

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Abstract

The invention discloses a fluorine-free efficient dephosphorizing agent for the pretreatment of a chromium-containing molten iron and belongs to the technical field of iron and steel metallurgy. The fluorine-free efficient dephosphorizing agent comprises CaO, BaCO3, an iron oxide, CaF2, Cr2O3 and an additive, wherein the additive is a rare-earth metal oxide or an alkali carbonate; the mass ratio of the CaO to the BaCO3 is 1:15-3:5; and the mass ratio of the CaF2 to the rare-earth metal oxide or the alkali carbonate is 7:18-25:6. The dephosphorizing agent can meet the pretreatment need of the chromium-containing molten iron produced in a blast furnace using laterite nickel ore, ensures a good slagging effect, and reduces the phosphorus content of the chromium-containing molten iron effectively as well as the pollution to the environment.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and more specifically relates to a low-fluorine, high-efficiency chromium-containing molten iron pretreatment dephosphorization agent. Background technique [0002] With the continuous rise of international iron ore prices and the continuous consumption of high-grade iron ore, adding lateritic nickel ore in blast furnace smelting has a good advantage in reducing costs, but the Cr element in the ore will be reduced during the smelting process into molten iron, affecting the quality of molten iron. Moreover, when the Cr content reaches above 0.20%, since the activity of Cr and P participating in the oxidation reaction is relatively close, Cr is preferentially oxidized over P, and the Cr produced by oxidation of a large amount of Cr elements 2 o 3 It will enter into the slag, resulting in viscous slag and difficulty in slag melting, which will deteriorate the kinetic conditions a...

Claims

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Application Information

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IPC IPC(8): C21C1/02
Inventor 李杰梁鹏王志胡金文江志
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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