Flux capable of reducing oxidability of steel ladle top dross

A ladle top slag, oxidizing technology, applied in the direction of improving process efficiency, etc., can solve the problem of precipitation of oxygen inclusions, etc.

Inactive Publication Date: 2013-12-11
NANJING MEISHAN METALLURGY DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ∑(FeO+MnO)% in the slag after slagging with this slagging agent is relatively high, and due to the high content of aluminum, it is easy to form inclusions with precipitated oxygen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] Prepare according to the weight percentages of each component in the following table 1:

[0020] Table 1:

[0021] CaO Al 2 o 3 Al CaC 2 SiO 2 MgO C（≤） Example 1 61 28 3.5 6 <3%

1.5 0.01% Example 2 63 20 5.5 8 <3%

3.5 0.01% Example 3 65 18 5.5 7 <3%

4.5 0.01% Example 4 67 15 7 6 <3%

5 0.01% Example 5 70 15 3.5 10 <3%

1.5 0.01%

[0022] In order to realize the weight percentages of each component disclosed in each embodiment in the above table, we adopt the following preparation scheme in the specific embodiment:

[0023] It is composed of active lime, pre-melted slag, calcium carbide and aluminum particles, and its weight percentage is: active lime 42-55%, pre-melted slag 32-40%, calcium carbide 7-10%, aluminum scrap 3-8%.

[0024] The technical requirements of each component are as follows:

[0025] Lime: CaO≮92%, P≯0.04%, S≯0.04%. The lime must be batched and packag...

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Abstract

The invention relates to an auxiliary material for steel smelting, in particular to a flux capable of reducing oxidability of steel ladle top dross. The invention aims at providing the flux capable of reducing the oxidability of the steel ladle top dross. The flux mainly reduces sigma (FeO+MnO)% in the steel ladle top dross, raises a degree of purity of molten steel, and simultaneously solves the technical problem that the common modifier cannot achieve nitrogen adding. The flux adopts the technical scheme that the flux capable of reducing the oxidability of the steel ladle top dross comprises the following chemical constituents by weight percentage: 57-70% of CaO, 15-28% of Al2O3, 3.5-7% of Al, 6-10% of CaC2, 1.5-5% of MgO, less than 3% of SiO2, less than or equal to 0.01% of C, and less than or equal to 0.3% of water. Therefore, an appropriate amount of the modifier is added during steel tapping of a converter, average sigma (FeO+MnO)% is 1.4% when the steel exits an argon station, and a modification effect is achieved. In addition, 2ppm nitrogen is added during a test, so that the nitrogen adding test requirement is met.

Description

[0001] technical field [0002] The invention relates to an auxiliary material for iron and steel smelting, in particular to a flux capable of reducing the oxidation of ladle top slag. [0003] Background technique [0004] With the increasingly stringent requirements of users for steel quality, the content of inclusions in steel must be less and less, and the particle size must be smaller and smaller. When the steel is tapped, alloys such as aluminum-iron and ferrosilicon are added to deoxidize the molten steel. The ∑(FeO+MnO)% in the slag is generally greater than 7%. Such deoxidized products in molten steel are difficult to float. In addition, as the temperature of molten steel continues to decrease during pouring, the solubility of oxygen decreases. After oxygen precipitates, it reacts with aluminum in the steel to form aluminum oxide, which becomes an important source of inclusion formation and nozzle blockage. In severe cases, production is difficult. [0005] At pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076
CPCY02P10/20
Inventor 王士青洪建国蔡继彪
Owner NANJING MEISHAN METALLURGY DEV
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