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Molten iron smelting method and vanadium-containing molten iron smelting method

A smelting method and molten iron technology, applied in the direction of manufacturing converters, etc., can solve problems such as difficulty in slagging and dephosphorization of molten iron, and achieve the effects of low production cost, stable desulfurization, and small equipment investment

Inactive Publication Date: 2013-07-10
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Another object of the present invention is to provide a method for smelting vanadium-containing molten iron in order to overcome the difficulty of slagging and dephosphorizing the molten iron after desulfurization and vanadium extraction when smelting with vanadium-containing molten iron

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  • Molten iron smelting method and vanadium-containing molten iron smelting method

Examples

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Effect test

Embodiment 1

[0035] In this embodiment, 27CrMoV high-grade low-phosphorus-sulfur pipeline steel is smelted.

[0036] (1) Carry out compound injection deep desulfurization with vanadium-containing molten iron as raw material, its injection time is 18.33 minutes, with respect to 1 ton of vanadium-containing molten iron, use 3.53 kilograms of passivated lime powder (the content of CaO is 93.2% by weight), 0.91 kg of passivated magnesium powder (the metal Mg content is 93.4% by weight) to obtain desulfurized molten iron. In vanadium-containing molten iron, the contents of C, V, Mn, S, P, Si, Ti, and Fe in weight percent are shown in Table 1. Table 2 shows the contents of C, V, Mn, S, P, Si, Ti, and Fe in weight percent in the obtained molten iron after desulfurization.

[0037] (2) add the molten iron after the desulfurization of 140t in Panzhihua Iron and Steel's 120t compound blowing vanadium converter, add the sodium salt of 1.5t (the NaCO that contains 86.8% by weight 3 ), and use a 339 ...

Embodiment 2

[0043] In this example, 27CrMoNbV low-phosphorus-sulfur pipeline steel was smelted.

[0044] (1) Carry out compound injection deep desulfurization with vanadium-containing molten iron as raw material, its injection time is 34.6 minutes, relative to 1 ton of vanadium-containing molten iron, use 5.2 kilograms of passivated lime powder (the content of CaO is 93.2% by weight), 1.11 kg of passivated magnesium powder (the metal Mg content is 93.4% by weight) to obtain desulfurized molten iron. In vanadium-containing molten iron, the contents of C, V, Mn, S, P, Si, Ti, and Fe in weight percent are shown in Table 1. Table 2 shows the contents of C, V, Mn, S, P, Si, Ti, and Fe in weight percent in the obtained molten iron after desulfurization.

[0045] (2) Add 140t of molten iron after desulfurization in Panzhihua Iron and Steel 120t re-blowing vanadium converter, add 3.2t of sodium salt (containing 86.8% by weight of NaCO 3 ), and use a 339 oxygen lance for oxygen blowing and depho...

Embodiment 3

[0051] What this embodiment smelts is P72LX cord steel.

[0052] (1) Carry out compound injection deep desulfurization with vanadium-containing molten iron as raw material, its injection time is 24.2 minutes, with respect to 1 ton of vanadium-containing molten iron, use 4.7 kilograms of passivated lime powder (the content of CaO is 93.2% by weight), 1.03 kg of passivated magnesium powder (the metal Mg content is 93.4% by weight) to obtain desulfurized molten iron. In vanadium-containing molten iron, the contents of C, V, Mn, S, P, Si, Ti, and Fe in weight percent are shown in Table 1. Table 2 shows the contents of C, V, Mn, S, P, Si, Ti, and Fe in weight percent in the obtained molten iron after desulfurization.

[0053] (2) Add 140t of molten iron after desulfurization in Panzhihua Iron and Steel 120t re-blown vanadium converter, add 2.8t of sodium salt (containing 86.8% by weight of NaCO 3 ), and use a 339 oxygen lance for oxygen blowing and dephosphorization, and add 1t o...

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Abstract

The invention provides a molten iron smelting method, which includes that first slag formers are added into desulfurized molten iron in a converter to realize first-time blowing slag forming under the condition of oxygen blowing, and second slag formers are added into the converter to realize second-time blowing slag forming under the condition of oxygen blowing after 50-70wt.% of total slag is removed. The invention further provides a vanadium-containing molten iron smelting method. The smelting methods solve the problems of insufficiency of heat sources for steelmaking with molten iron and difficulty in slag forming and dephosphorization, so that the process is smooth, equipment investment is less, production cost is low, and simultaneously capacities and production rhythms of front andback procedures can be matched in aftereffect.

Description

technical field [0001] The invention relates to a method for smelting molten iron and a method for smelting vanadium-containing molten iron using the method. Background technique [0002] Phosphorus is a harmful impurity in steel, which is easy to segregate at the grain boundary, causing the steel to be "cold and brittle", and significantly reducing the low temperature impact toughness of the steel. Some aerospace, atomic energy, and corrosion-resistant pipeline steels require finished phosphorus to be less than 0.005% by weight. [0003] Sulfur is also one of the harmful elements in steel. It is a surface active element. It is often segregated and aggregated in the form of MnS on the grain boundary of steel or on the interface of different phases. The biggest harm of sulfur to steel is to cause hot embrittlement of steel. Some X70 and above oil pipeline steels, and high-grade automotive steels require finished sulfur to be less than 0.005% by weight. [0004] In my countr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28
Inventor 何为曾建华陈永杨素波杨森祥曾耀先蒋龙奎王建李安林
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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