Method for smelting ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron

A smelting method and ultra-low sulfur technology, applied in the field of iron and steel metallurgy, can solve the problems of large investment in equipment, difficulty in ensuring product quality stability, and unsuitability

Active Publication Date: 2011-04-20
河北龙凤山铸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, it is difficult to guarantee the quality stability of the pig iron for ductile iron with strict requirements on production uniformity, especially the ductile iron for wind power castings
In addition, in order to achieve ultra-low sulfur, the hot metal pretreatment station is generally used to desulfurize the blast furnace hot metal outside the furnace. The purpose is to prepare for steelmaking, and there are disadvantages such as large equipment investment and large floor space.
This technology is not suitable for the production of pig iron for ultra-low sulfur, low silicon, low titanium gray ductile iron

Method used

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  • Method for smelting ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron
  • Method for smelting ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron
  • Method for smelting ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: At 600m 3 For the pig iron used in smelting ductile iron for high-grade blast furnaces, the raw materials for blast furnaces shall be selected according to the standards in Attached Table 1, including 66.61% of high-alkali sintered nodular pig iron pellets and 33.39% of nodular pig iron pellets, and the alkalinity of high-alkali sintered nodular pig iron is controlled at 1.98; Si] control 0.15-0.35%, R 2 Control 1.15-1.20, control [Ti] ≤ 0.032%; molten iron detection [Si] is 0.15%, [S] is 0.014%; weigh 270kg of ferrosilicon powder according to the standard of attached table 2, and add ferrosilicon powder evenly when tapping to the molten iron flow; subsequent processing of industrial alkali Na 2 CO 3 200kg, spray nitrogen into the molten iron in the molten iron tank through the spray gun after tapping, the pressure of the nitrogen flow is controlled at 600Kpa, and the injection time is 40 seconds; use the inoculant adding device 4 of the cast iron machine t...

Embodiment 2

[0041] Example 2: at 600m 3 For pig iron used in smelting ductile iron for high-grade blast furnaces, raw materials for blast furnaces shall be selected according to the standards in Attached Table 1, including 70% of high-alkali sintered nodular pig iron and 30% of nodular pig iron pellets, and the alkalinity of high-alkali sintered nodular pig iron shall be controlled at 1.95; Si] control 0.15-0.35%, R 2 Control 1.15-1.20, control [Ti] ≤ 0.032%; molten iron detection [Si] is 0.35%, [S] is 0.011%; weigh 110kg of ferrosilicon powder according to the standard of attached table 2, and add the ferrosilicon powder evenly when tapping the iron to the molten iron flow; subsequent processing of industrial alkali Na 2 CO 3 80kg, spray nitrogen into the molten iron in the molten iron tank through the spray gun after tapping, the nitrogen flow pressure is controlled at 700Kpa, and the injection time is 30 seconds; the inoculant silicon-barium alloy is added according to 0.9kg / t molten...

Embodiment 3

[0042] Example 3: At 600m 3 For pig iron used in smelting ductile iron for high-grade blast furnaces, raw materials for blast furnaces shall be selected according to the standards in Attached Table 1, including 65% of high-alkali sintered nodular pig iron pellets and 35% of nodular pig iron pellets, and the alkalinity of high-alkali sintered nodular pig iron is controlled at 2.00; Si] control 0.15-0.35%, R 2 Control 1.15-1.20, control [Ti] ≤ 0.032%; molten iron detection [Si] is 0.30%, [S] is 0.015%; weigh 230kg of ferrosilicon powder according to the standard of attached table 2, and add the ferrosilicon powder evenly when tapping the iron to the molten iron flow; subsequent processing of industrial alkali Na 2 CO 3 _120kg, spray nitrogen into the molten iron in the molten iron tank through the spray gun after tapping the iron, the pressure of the nitrogen flow is controlled at 500Kpa, and the injection time is 60 seconds; use the inoculant adding device 4 of the cast iron ...

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Abstract

The invention discloses a method for smelting ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron, belonging to the technical filed of steel making, and used for solving the problem of stably producing the ultra-low sulfur, silicon and titanium grey nodular cast iron by a blast furnace with the pig iron. The method comprises the following steps: a, blast furnace raw materialselection; b, low silicon smelting; c, stokehole silicon addition; d, stokehole desulfuration treatment; e, nitrogen spraying and stirring; and f, pig machine inoculation. The invention utilizes the treatment techniques of blast furnace raw material selection, low silicon smelting, stokehole silicon addition, stokehole desulfuration treatment, nitrogen spraying and stirring and pig machine inoculation, thus solving the technical problem of problem of stably producing ultra-low sulfur, silicon and titanium grey nodular cast iron by the blast furnace with the pig iron. The product realizes not only low Si, low Ti and super low S but also gray, and is particularly suitable for producing large-scale cast ferritic nodular cast iron and large-scale high grade nodular iron pieces such as containers for wind power generation and nuclear fuel storage, and the like, thus filling the gap of the products of the type.

Description

technical field [0001] The invention relates to a pig iron and a smelting method, in particular to a blast furnace indirect smelting method of pig iron for ultra-low-sulfur, low-silicon, low-titanium gray ductile iron, belonging to the technical field of iron and steel metallurgy. Background technique [0002] At present, if pig iron for low-silicon and low-titanium gray ductile iron with extremely strict quality requirements is directly produced in a blast furnace, even if [C], [Si], [Mn], [P], [Ti] elements in the pig iron are qualified, [ S] elements are also difficult to pass all the more difficult to achieve ultra-low. Low [Si] means low furnace temperature, so [S] is high. To achieve ultra-low [S], it is necessary to increase the basicity of slag, which will inevitably affect the smooth operation of the furnace condition, and it is difficult to achieve the ash opening of the cross-section. Pig iron with low [Si] content is easy to produce cementite, resulting in aggra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/02C21C7/00C21C7/064C21C7/072C21C1/10
Inventor 白居秉
Owner 河北龙凤山铸业有限公司
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