Method for preparing high-phosphorus pig iron by using dephosphorized converter slag

A high-phosphorus pig iron and dephosphorization slag technology, applied in the field of metallurgy, can solve problems such as difficult coordination, accumulation, and complicated processes in the production process, and achieve the effects of reducing steel slag pollution and waste emissions, improving the operating environment, and reducing environmental pollution

Inactive Publication Date: 2011-09-14
NORTHEASTERN UNIV LIAONING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem in the above research is that the utilization rate of converter dephosphorization slag is not high, and recycling will lead to the enrichment and accumulation of phosphorus in the steelmaking process, resulting in unnecessary energy consumption and increasing the possibility of secondary pollution of molten steel
The disadvantage of this process is that the process is too complicated, the production process is difficult to coordinate, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The pig iron composition adopted is C 4.02%, Si 0.03%, Mn 0.34%, S 0.04%, P 0.06% by weight percentage, and the balance is iron.

[0037] The composition of the converter dephosphorization slag used is FeO 6.45%, CaO 48.5%, SiO 2 20.07%, MnO 6.3%, MgO 5.62%, Al 2 o 3 2.64%, P 2 o 5 5.88%, free CaO 2.61%, the balance is impurities, and the basicity is R 2.42.

[0038] The particle size of coke powder used is between 0.5-1.0mm; the particle size of quartz sand is between 1.0-2.0mm.

[0039] Put pig iron in an intermediate frequency furnace and melt it into pig iron water as a reaction raw material, pour the converter dephosphorization slag into the molten pig iron water, then add coke powder and quartz sand, the mass ratio of converter dephosphorization slag to pig iron water is 0.5, coke powder The mass ratio to converter dephosphorization slag is 0.3, and the amount of quartz sand added is 1.1 after adding the whole material to pig iron water.

[0040] The abov...

Embodiment 2

[0046] The pig iron composition adopted is C 4.33%, Si 0.05%, Mn 0.45%, S 0.05%, P 0.03% by weight percentage, and the balance is iron.

[0047] The composition of the converter dephosphorization slag used is FeO 5.76%, CaO 44.71%, SiO 2 17.84%, MnO8.27%, MgO4.08%, Al 2 o 3 4.92%, P 2 o 5 7.97%, free CaO 1.33%, the balance is impurities, and the basicity is R 2.51.

[0048] Coke powder and quartz sand that adopt are with embodiment 1.

[0049] Put pig iron in an intermediate frequency furnace and melt it into pig iron water as the reaction raw material, pour the converter dephosphorization slag into the molten pig iron water, then add coke powder and quartz sand, the mass ratio of converter dephosphorization slag to pig iron water is 0.6, coke powder The mass ratio to converter dephosphorization slag is 0.4, and the amount of quartz sand added is 1.0 after adding the whole material to pig iron molten water.

[0050] The above-mentioned prepared materials are heated by...

Embodiment 3

[0056] The pig iron composition adopted is C 4.26%, Si 0.02%, Mn 0.27%, S 0.007%, P 0.01% by weight percentage, and the balance is iron.

[0057] The composition of the converter dephosphorization slag used is FeO 14.33%, CaO 41.02%, SiO 2 24.58%, MnO3.15%, MgO4.22%, Al 2 o 3 2.17%, P 2 o 5 5.03%, free CaO 0.54%, the balance is impurities, and the alkalinity is R1.67.

[0058] Coke powder and quartz sand that adopt are with embodiment 1.

[0059] Put the pig iron in the intermediate frequency furnace and melt it into pig iron water as the reaction raw material, pour the converter dephosphorization slag into the molten pig iron water, then add coke powder and quartz sand, the mass ratio of the converter dephosphorization slag to pig iron water is 0.7, and the coke powder The mass ratio to converter dephosphorization slag is 0.5, and the amount of quartz sand added is 1.1 after adding all the materials into pig iron water.

[0060] Oxygen blowing is carried out to raise...

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Abstract

The invention relates to a method for preparing high-phosphorus pig iron by using dephosphorized converter slag, which belongs to the technical field of metallurgy. The method comprises the following steps of: pouring the dephosphorized converter slag into melted pig iron which is used as a raw material; then adding coke powder and quartz sand into the melted pig iron; blowing oxygen to increase the temperature of the prepared materials; at the same time, introducing argon into the bottom, wherein the reaction temperature is between 1,530 and 1,550 DEG C and the reaction time is 20 to 30 minutes; removing the obtained slag to obtain intermediate melted pig iron; and adding the materials again according to the steps 1 and 2 and reducing for 1 to 2 times by using the intermediate melted pigiron as a raw material. The method has the advantages that: the maximum utility value of the dephosphorized converter slag can be fully exerted; a low-grade phosphorous-ferro product is obtained; theslag can be recycled; the dephosphorized slag is premelted at a high temperature, so the ferric oxide content is very low and the slagging speed is high during cyclic utilization; and the applicationrange is wide.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing high-phosphorus pig iron by using converter dephosphorization slag. Background technique [0002] Steel slag is one of the main solid wastes discharged in the iron and steel metallurgical process. With the rapid development of my country's iron and steel industry, the discharge of steel slag is increasing year by year. In 2008, my country's crude steel output was 501 million tons, accounting for 37.7% of the world's total crude steel production. The discharge of steel slag is calculated according to the standard of 100kg / ton of steel. Add about 50 million tons of steel slag. If a large amount of steel slag cannot be recycled in time, the open-air stacking will not only occupy a large amount of land, but also seriously pollute the surrounding ecological environment. In addition, the large amount of heat energy carried by the steel slag and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/076
CPCY02P10/20
Inventor 王德永刘承军王慧华姜茂发闵义史培阳冯巍冯海东李星徐磊
Owner NORTHEASTERN UNIV LIAONING
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