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Smelting method of vanadium-containing molten iron

A smelting method and molten iron technology, applied in the smelting field of vanadium-containing molten iron, can solve the problems of low carbon yield, complicated steps, low heat source, etc. The effect of high carbon yield

Inactive Publication Date: 2013-02-13
PANZHIHUA IRON AND STEEL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned methods all carry out carburization in molten steel, and the problem of insufficient heat source caused by the low carbon content when using semi-steel in the converter smelting process has not been solved. The yield is not very high, and the steps are complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 140 tons of semi-steel (3.80% by weight of C, 0.030% by weight of Mn, 0.030% by weight of V, 0.004% by weight of Si, and 0.008 % by weight, P is 0.070% by weight, and the balance is Fe), the above-mentioned semi-steel is tapped in the ladle, and in the process of going out of the semi-steel to the ladle from the converter, the graphite-like recarburizer is added in the ladle (C is 82 % by weight, H 2 O is 1.0% by weight, S is 0.35% by weight, P is 0.10% by weight, particle size is 2-10mm), relative to the total amount of semi-steel, the addition amount of graphite-like recarburizer is 1.79kg / t semi-steel. Wherein, the speed of the semi-steel out of the converter is 28t / min, and the graphite-like recarburizer starts to add when the amount of semi-steel produced is 6.7% by weight of the semi-steel total amount, and when the semi-steel produced is 66.7% by weight of the semi-steel total amount The addition is completed when the weight % is added, and the addition speed is...

Embodiment 2

[0028] 140 tons of semi-steel (C is 3.80% by weight, Mn is 0.030% by weight, V is 0.030% by weight, Si is 0.004% by weight, S is 0.008% % by weight, P is 0.070% by weight, and the balance is Fe), adding a graphite-like recarburizer (C is 82% by weight, H 2 O is 1.0% by weight, S is 0.35% by weight, P is 0.10% by weight, particle size is 2-10mm), relative to the total amount of semi-steel, the addition amount of graphite-like recarburizer is 1.43kg / t semi-steel. Wherein, the speed of semi-steel output from the converter is 28t / min, and the graphite-like recarburizer starts to add when the amount of semi-steel output is 10% of the total amount of semi-steel, and the amount of semi-steel output is 66.7% of the total amount of semi-steel %, the addition was completed, and the addition rate was controlled to be constant during the addition. Sampling was carried out after the semi-steel was exhausted, and the composition of the semi-steel was analyzed. In the obtained carburized se...

Embodiment 3

[0030]140 tons of semi-steel (3.80% by weight of C, 0.030% by weight of Mn, 0.030% by weight of V, 0.004% by weight of Si, and 0.008 % by weight, P is 0.070% by weight, and the balance is Fe). Converter goes out semi-steel to the process of ladle, adds class graphite recarburizer (C is 82% by weight, H 2 O is 1.0% by weight, S is 0.35% by weight, P is 0.10% by weight, particle size is 2-10mm), relative to the total amount of semi-steel, the addition amount of graphite-like recarburizer is 2.14kg / t semi-steel. Wherein, the speed of the semi-steel out of the converter is 28t / min, and the graphite-like recarburizer begins to add when the amount of semi-steel produced is 10% by weight of the semi-steel total amount, and when the semi-steel produced is 60% by weight of the semi-steel total amount The addition is completed when the weight % is added, and the addition speed is controlled to be constant during the addition process. Sampling was carried out after the semi-steel was e...

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Abstract

The invention provides a smelting method of vanadium-containing molten iron; the method comprises converter vanadium extraction of the vanadium-containing molten iron, steel tapping of semisteel obtained by the converter vanadium extraction into a steel ladle, and converter smelting of the semisteel; the invention is characterized in that the method also comprises the addition of a carburant into the steel ladle during the steel tapping of the semisteel into the steel ladle. According to the method of the invention, the semisteel carbon content is effectively improved; the carbon yield of the carburant is increased; and the temperature decrease due to the carburant is reduced.

Description

technical field [0001] The invention relates to a method for smelting vanadium-containing molten iron. Background technique [0002] Some iron and steel plants use vanadium-titanium magnetite for smelting. In order to ensure the effective utilization of resources, desulfurization and vanadium extraction processes are usually carried out before converter steelmaking. The mass percentage of carbon in semi-steel after desulfurization and vanadium extraction is 3.5- 4.0%, the mass percent content of phosphorus in the semi-steel is 0.060-0.080%, and the content of other heating elements such as silicon and manganese are trace amounts. Since the contents of silicon and manganese heating elements are trace amounts, there are problems such as insufficient heat source in the semi-steel steelmaking process, and such semi-steel cannot obtain a suitable steelmaking effect during converter steelmaking. [0003] In the prior art, it is usually to add carburant in molten steel. For exampl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/00
Inventor 蒋龙奎戈文荪黄正华王建李清春
Owner PANZHIHUA IRON AND STEEL