Fluorin-free composite quick slag-forming constituents for convertor steelmaking and method of producing the same

A converter steel-making and slag-forming agent technology, which is applied in the manufacture of converters and other directions, can solve the problems of fluoride pollution, slow slagging, erosion of furnace lining, etc., and achieves a simple preparation method, reduces splashing, and improves slag-forming speed. Effect

Inactive Publication Date: 2009-02-18
JIANGSU ZHENGDA FURNACE CHARGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a fluorine-free composite rapid slagging agent for converter steelmaking to avoid defects such as fluoride pollution of the environment, erosion of furnace lining, and slow slagging speed in existing slagging agents.

Method used

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  • Fluorin-free composite quick slag-forming constituents for convertor steelmaking and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A fluorine-free composite rapid slagging agent for converter steelmaking, which contains the following components in weight percentage: 40% of MnO, 16% of CaO, 25% of TFe, 13.5% of MgO, H 2 O 0.5%, Al 2 o 3 3%, polyvinyl alcohol 2%.

[0026] The preparation method is as follows:

[0027] (1) MnO, CaO, TFe, MgO and Al 2 o 3 Send it to the jaw crusher for mixing and coarse crushing;

[0028] (2) Carry out fine crushing again until the particle size of the material is less than or equal to 3mm;

[0029] (3) In the pulverized material, add the polyvinyl alcohol of formula quantity, add the water that weight is 1.5 times of polyvinyl alcohol weight again, mix evenly;

[0030] (4) Send it into the ball pressing machine again and press it into an ellipsoid;

[0031] (5) Send the pressed balls into a drying room for curing or drying in fine weather until the moisture content of the product reaches 0.5%.

Embodiment 2

[0033] A fluorine-free composite rapid slagging agent for converter steelmaking, which comprises the following components in weight percentage: 35% of MnO, 18% of CaO, 30% of TFe, 8.3% of MgO, H 2 O 0.7%, Al 2 o 3 5%, polyvinyl alcohol 3%.

[0034] The preparation method is as follows:

[0035] (1) MnO, CaO, TFe, MgO and Al 2 o 3 Send it to the jaw crusher for mixing and coarse crushing;

[0036] (2) Carry out fine crushing again until the particle size of the material is less than or equal to 3mm;

[0037] (3) In the pulverized material, add the polyvinyl alcohol of formula quantity, add the water that weight is 1.5 times of polyvinyl alcohol weight again, mix evenly;

[0038] (4) Send it into the ball pressing machine again and press it into an ellipsoid;

[0039] (5) Send the pressed balls into a drying room for curing or drying in fine weather until the moisture content of the product reaches 0.7%.

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Abstract

The invention discloses a fluorine-free compounded fast slagging agent used for the steel-making of a converter, which comprises the components with the following weight percentage: 35 to 45 percent of MnO; 15 to 18 percent of CaO; 15 to 30 percent of TFe; 5 to 15 percent of MgO; 0.5 to 0.7 percent of H2O; 2 to 5 percent of Al2O3; 1 to 3 percent of organic bond. The invention also discloses a preparation method for the fluorine-free compounded fast slagging agent used for the steel-making of a converter. The fluorine-free compounded fast slagging agent used for the steel-making of a converter not only can be environmental friendly to prepare slag without fluorine, but also can increase the content of Mn at the end point of the molten steel, reduce the consumption of Mn alloy at the anaphase and reduce the cost. After the fluorine-free compounded fast slagging agent is used, the liquidity of the molten steel is good; the phenomena of spraying and dry returning of the molten steel can be reduced; besides, a lance-sticking phenomenon can be effectively reduced; the generating of a large lance knob is restrained; moreover, the sludging speed can be obviously improved and the dephosphorization effect can be improved to promote the dephosphorization of the convertor.

Description

technical field [0001] The invention belongs to the slagging technology for converter steelmaking, in particular to a fluorine-free composite rapid slagging agent for converter steelmaking and a preparation method thereof. Background technique [0002] Energy saving and cost reduction, science and environmental protection are the general trend of our country at present. Efficient and clean converter smelting is the core task of the development of steelmaking technology in the 21st century. [0003] As we all know, the addition of calcium fluoride, a slagging agent, will not only seriously erode the furnace lining, but also reduce the service life of the converter. Moreover, the fluorine-containing solid waste formed after slagging will not only pollute the environment, but also endanger human health. Moreover, the use of the existing slagging agent will make the end-point manganese content of molten steel low, increase the input of alloy amount in the later stage, and incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/00
Inventor 黄正君
Owner JIANGSU ZHENGDA FURNACE CHARGE
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