CN100393892C - Desulfur technology of phosphorus molten pig iron for precalcining anode pouring - Google Patents

Desulfur technology of phosphorus molten pig iron for precalcining anode pouring Download PDF

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Publication number
CN100393892C
CN100393892C CNB2005100199919A CN200510019991A CN100393892C CN 100393892 C CN100393892 C CN 100393892C CN B2005100199919 A CNB2005100199919 A CN B2005100199919A CN 200510019991 A CN200510019991 A CN 200510019991A CN 100393892 C CN100393892 C CN 100393892C
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China
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pig iron
phosphorus
iron
molten pig
phosphor
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CN1786209A (en
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蒙建德
李矛
姜潮阳
龚坤荣
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Aluminum Corp of China Ltd
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Aluminum Corp of China Ltd
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Abstract

The present invention relates to a desulfurizing method of phosphor molten pig iron for casting prebaked anodes by using the prior melting facilities. When the temperature of the phosphor molten pig iron reaches more than 1100 DEG C, 2 to 5 percent of calcium carbide of which the grain size is less than 2 to 6mm is added into the melted phosphor molten pig iron, after the melted phosphor molten pig iron and the calcium carbide react for more than two minutes, slag is fetched, and molten iron is discharged according to regular production. The deprivation rate of sulfur in phosphor pig iron is more than 60% by using the method.

Description

A kind of method of phosphorus molten pig iron for precalcining anode pouring desulfurization
Technical field:
The present invention relates to a kind of desulfur technology of phosphorus molten pig iron for precalcining anode pouring, belong to the aluminum smelting technology technical field.
Background technology:
In pre-baked anode for aluminum is produced, generally adopt phosphorus molten pig iron antianode steel pawl and anode about 1400 ℃ to carry out welding.The quality of phosphorus iron quality can directly influence the anodic casting quality, cast efficient and electrolytic current efficiency etc.The main alloy element of the phosphorus pig iron is C, Si, Mn, P, S.Wherein S is a harmful element, and sulfur increases the flowing property that can worsen the phosphorus pig iron, makes the iron hoop embrittlement after the cast, influence the anodic use, and can increase the iron carbon pressure and fall deterioration electrolysis of aluminum economic and technical norms.At present, the phosphorus desulfuration of foundry iron is adopted the way of adding the new pig iron or all scrapping the renewal phosphorus pig iron usually, the cost expenditure of these ways is higher, how to adopt new inexpensive method that the phosphorus pig iron is carried out desulfurization, has become insider's common recognition.
Summary of the invention:
The object of the present invention is to provide a kind of phosphorus process of desulfuration of foundry iron of cheapness, by add a spot of calcium carbide in the phosphorus pig iron, utilize existing melting equipment, the decreasing ratio of sulphur in the phosphorus pig iron is reached more than 60%, sulphur content drops to below 0.2% in the phosphorus pig iron.
The technical scheme that invention is taked is:
In the phosphorus pig iron of fusing, add calcium carbide desulfurization.Adding granularity is the following calcium carbide of 2~6mm, adds the calcium carbide of total raw material amount 2~5% in time more than 1100 ℃ in phosphorus pig iron smelting furnace, and reacts more than 2 minutes.Drag for slag, and go out molten iron by ordinary production.
Adopt present method that the phosphorus pig iron is carried out desulfurization and have following effect:
1) desulfuration efficiency height, desulfuration efficiency reaches more than 60%, and sulphur content can drop to below 0.2% in the phosphorus pig iron.
2) cost is low, scraps the sulphur removal of the phosphorus pig iron and can reduce expenses 1000 yuan/ton than disposable.Be calculated as follows: the unit price of scrapping the phosphorus pig iron is 1700 yuan/ton, and desulfurization is 2500 yuan/ton with the calcium carbide unit price, then with this technical finesse phosphorus pig iron per ton 1700-2500 * 2.5%=1637.5 unit of can reducing expenses.
3) present method is utilized existing melting equipment, to the not influence in work-ing life of furnace lining.
Embodiment:
Example 1:
The calcium carbide that will meet national quality requirement standard is crushed to below 2~6mm.Drag for slag, and go out molten iron by ordinary production.In the main frequency furnace of 3t, phosphorus pig iron raw material is pressed foundry return 2850Kg, pig iron 100Kg, ferrosilicon 10Kg, ferromanganese 8Kg, the proportioning weighing of ferrophosphorus 3Kg is good, joins cupola intensification melting, in the time of 1300 ℃, add the calcium carbide of 80kg, and allow its reaction 4 minutes, go out molten iron after dragging for slag.
Example 2:
The calcium carbide that will meet national quality requirement standard is crushed to below 2~6mm.Drag for slag, and go out molten iron by ordinary production.In 6 main frequency furnace, phosphorus pig iron raw material is pressed foundry return 5700Kg, pig iron 200Kg, ferrosilicon 20Kg, ferromanganese 16Kg, the proportioning weighing of ferrophosphorus 6Kg is good, joins cupola intensification melting, in the time of 1400 ℃, add the calcium carbide of 290kg, and allow its reaction 6 minutes, go out molten iron after dragging for slag.

Claims (1)

1. the method for a phosphorus molten pig iron for precalcining anode pouring desulfurization is characterized in that: adding granularity in the phosphorus pig iron smelting furnace more than 1100 ℃ the time is the calcium carbide desulfurization of 2~6mm, and the calcium carbide of adding is 2~5% of a total phosphorus pig iron material quantity, and reacts more than 2 minutes.
CNB2005100199919A 2005-12-08 2005-12-08 Desulfur technology of phosphorus molten pig iron for precalcining anode pouring Active CN100393892C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2005100199919A CN100393892C (en) 2005-12-08 2005-12-08 Desulfur technology of phosphorus molten pig iron for precalcining anode pouring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2005100199919A CN100393892C (en) 2005-12-08 2005-12-08 Desulfur technology of phosphorus molten pig iron for precalcining anode pouring

Publications (2)

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CN1786209A CN1786209A (en) 2006-06-14
CN100393892C true CN100393892C (en) 2008-06-11

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105296700B (en) * 2014-06-13 2017-09-29 大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心 A kind of sulfur removal technology of the phosphorus pig iron used for casting pre-roasting anode

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5514808A (en) * 1978-07-14 1980-02-01 Ibiden Co Ltd Desulfurizer for molten iron and its manufacture
CN1477213A (en) * 2003-06-05 2004-02-25 范玉全 Compound desulfurizing agent for molten iron
CN1614035A (en) * 2002-01-07 2005-05-11 张炼 Composite refiner for metallurgy

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5514808A (en) * 1978-07-14 1980-02-01 Ibiden Co Ltd Desulfurizer for molten iron and its manufacture
CN1614035A (en) * 2002-01-07 2005-05-11 张炼 Composite refiner for metallurgy
CN1477213A (en) * 2003-06-05 2004-02-25 范玉全 Compound desulfurizing agent for molten iron

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