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Method for extracting vanadium and removing phosphorus from vanadium-containing molten iron and steel-smelting technique using the same method

A technology for extracting vanadium dephosphorization agent and molten iron, which is applied in the field of steelmaking technology, can solve the problems of process complexity and reduction, and achieve the effect of reducing the pressure of dephosphorization

Active Publication Date: 2008-07-09
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, in order to reduce the phosphorus content in the finished steel, a dephosphorization process is added on the basis of the original steelmaking process, which complicates the process

Method used

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  • Method for extracting vanadium and removing phosphorus from vanadium-containing molten iron and steel-smelting technique using the same method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Desulfurization of vanadium-containing molten iron: the vanadium-containing molten iron smelted in the blast furnace, after desulfurization and slag removal, the vanadium-containing low-sulfur molten iron is obtained, and its composition is: 4.23%C, 0.16%Si, 0.15%Mn, 0.28%V, 0.010%S , 0.060% P, 0.18% Ti, and the balance is Fe, all of which are percentages by weight, and the sum of the percentages is 100%;

[0023] 2) Dephosphorization while extracting vanadium: successively load Na 2 CO 3 and vanadium-containing low-sulfur hot metal, the charging amount of molten iron is 135t, Na 2 CO 3 The amount of addition is 2.5t, and then the converter is blown with oxygen; within 1 to 3 minutes of blowing with oxygen, add 600kg of iron oxide scale into the furnace as a coolant;

[0024] 3) Slag adjustment: after 5 minutes of blowing with oxygen, add 500kg of magnesia to the furnace for slag adjustment;

[0025] 4) Obtaining semi-steel and vanadium slag: then blowing with ox...

Embodiment 2

[0028] 1) Desulfurization of vanadium-containing molten iron: the vanadium-containing molten iron smelted in the blast furnace, after desulfurization and slag removal, the vanadium-containing low-sulfur molten iron is obtained, and its composition is: 4.42%C, 0.18%Si, 0.14%Mn, 0.24%V, 0.020%S , 0.077%P, 0.22%Ti, and the balance is Fe, all of which are percentages by weight, and the sum of the percentages is 100%;

[0029] 2) Dephosphorization while extracting vanadium: Add 140t of vanadium-containing low-sulfur molten iron into the 120t converter, and then carry out oxygen blowing to the converter; within 1 to 3 minutes of oxygen blowing, add 600kg of iron oxide scale into the furnace and Na 2 CO 3 2.5t;

[0030] 3) Slag adjustment: after 5 minutes of blowing with oxygen, add 350kg of magnesia to the furnace for slag adjustment;

[0031] 4) Obtaining semi-steel and vanadium slag: then blowing with oxygen supply for 0.5-1.0 minutes to stop the slag to produce semi-steel and ...

Embodiment 3

[0034] 1) Furnace low-sulfur molten iron for oxygen blowing: Use low-sulfur high-vanadium iron block (water) smelted in an electric furnace to extract vanadium and dephosphorize. The composition of the molten iron is: 4.08%C, 0.38%Si, 0.43%Mn, 1.24% V, 0.018% S, 0.118% P, 0.46% Ti, the balance is Fe, the above are weight percentages, and the sum of the percentages is 100%; 500kg of the molten iron is added to the medium frequency induction furnace for melting, or 500kg of the molten iron Blended into the intermediate frequency induction furnace for oxygen blowing;

[0035] 2) Dephosphorization while extracting vanadium: within 3 to 5 minutes of blowing with oxygen supply, add 13 kg of vanadium extracting and dephosphorizing agent Na 2 CO 3 (Na 2 CO 3 It not only has the function of vanadium extraction and dephosphorization, but also has the function of coolant, and no additional coolant can be added);

[0036] 3) To obtain semi-steel and vanadium slag: the total time of bl...

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Abstract

The invention provides a vanadium extraction dephosphorization process from vanadium melted iron and a steel-smelting technology which uses the process. The vanadium extraction dephosphorization process from vanadium melted iron comprises adding vanadium extraction dephosphorization agent and cooling agent in melted iron in the process of oxygen supply blowing for vanadium melted iron, and obtaining vanadium slag and low phosphorus semi-steel. The process can extract vanadium at the same time of dephosphorization, thereby not only guaranteeing the effective extraction of vanadium, but also effectively removing phosphorus in melted iron.

Description

technical field [0001] The invention relates to a pretreatment method of molten iron and a steelmaking process utilizing the method, more specifically, the present invention relates to a method for extracting vanadium and dephosphorizing from vanadium-containing molten iron and a steelmaking process utilizing the method. Background technique [0002] The traditional steelmaking process includes the following steps: blast furnace hot metal→desulfurization→vanadium extraction (to obtain semi-steel)→steelmaking→to obtain finished steel. Specifically, molten iron containing vanadium is obtained from blast furnace ironmaking, and the composition and temperature of the mixed iron furnace are uniform and the molten iron is stored. Put it into converter steelmaking to get finished steel. [0003] However, with the advancement of technology, the industry has put forward higher and higher requirements for the quality of steel, and lower and lower requirements...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C22B34/22
Inventor 戈文荪何为彭毅王建
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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