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Method for recarburizing phosphorous pig iron

A technology of phosphorus pig iron and carburizing agent, which is applied in the field of phosphorus pig iron carburization, can solve the problems of returning phosphorus pig iron to scrap, poor carburization effect, material waste loss, etc., achieve less scum, improve the quality of phosphorus pig iron, and increase the absorption rate Effect

Active Publication Date: 2015-05-27
山东信发华源铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention provides a method for increasing the carbon of phosphorus pig iron with high absorption rate and obvious carbon increasing effect, which can effectively solve the problems of poor carbon increasing effect, scrapping of phosphorus pig iron returned to the furnace, and material waste and loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 101: Melting phosphorus pig iron.

[0026] Step 102: adding a recarburizer accounting for 0.45% by weight of the phosphorus pig iron and having a particle size of 1-10 mm.

[0027] The recarburizer can be added after the slag removal treatment is carried out on the molten phosphorus pig iron.

[0028] The recarburizer can be graphite recarburizer, its fixed carbon content is 90-100%, the powder resistivity is 50-200μΩ·m, and the true density is 2.0-2.26g / cm 3 , Sulfur 50%.

[0029] Step 103: Fully stir the phosphorus pig iron solution and let it stand for 2 minutes.

[0030] Step 104: Adding 0.3% by weight of phosphorus pig iron, a recarburizer with a particle size of 1-10 mm.

[0031] The recarburizer can be added after the slag removal treatment is carried out on the molten phosphorus pig iron.

[0032] Step 105: Fully stir the phosphorus pig iron solution and let it stand for 5 minutes.

[0033] So far, two additions of recarburizers to the phosphorus pig i...

Embodiment 2

[0037] Step 201: adding a recarburizer accounting for 0.6-3.5% by weight of the remaining phosphorus pig iron in the remaining phosphorus pig iron water of the intermediate frequency furnace and having a particle size of 1-10 mm.

[0038] The weight of the remaining phosphorus pig iron water from the last batch of the intermediate frequency furnace is about 200-300kg, which is the remaining balance after the last furnace of phosphorus pig iron water is cast out of the furnace.

[0039] Step 202: Fully stir the phosphorus pig iron solution and let it stand for 5 minutes.

[0040] Step 203: Add phosphorus pig iron.

[0041] For an intermediate frequency furnace with a capacity of 2 tons, 1600kg of phosphorus pig iron can be added.

[0042] Step 204: Melting the phosphorus pig iron.

[0043] Step 205: Adding a recarburizer accounting for 0.35% by weight of the phosphorus pig iron and having a particle size of 1-10 mm.

[0044] The recarburizer can be added after the slag remov...

Embodiment 3

[0053] Step 301: Add 7kg of graphite recarburizer to the remaining molten iron from the last smelting in the intermediate frequency furnace, stir and let it stand for 3 minutes, and use the self-stirring ability of the intermediate frequency furnace to make the molten iron fully absorb the recarburizer.

[0054] The weight of the remaining phosphorous pig iron water from the last batch of the intermediate frequency furnace is about 200-300kg, that is, 2.3-3.5% of the weight of the remaining phosphorus pig iron from the previous batch of the intermediate frequency furnace is added.

[0055] Step 302: Add various ingredients of iron and 1700kg of returned phosphorus pig iron, and carry out slag removal after all are melted.

[0056] Step 303: Add 4 kg of carburant, stir and let stand for 5 minutes to remove slag.

[0057] Step 304: Add 2 kg of recarburizer, stir and let stand for 5 minutes to remove slag, and the molten iron is cast out of the furnace.

[0058] In this embodime...

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PUM

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Abstract

The invention discloses a method for recarburizing phosphorous pig iron, which is used during prebaked an anode assembly. A recarburizer is added to the phosphorous pig iron in a molten state for at least two times, wherein the total weight of the recarburizer occupies 0.46 to 1.9 percent of the total weight of the phosphorous pig iron. The recarburizer in the method has high absorptivity and achieves an obvious recarburization effect, so that the carbon content of the phosphorous pig iron can be effectively increased and the problems of poor recarburization effect, return phosphorous pig iron scrapping, and material waste and loss can be solved.

Description

technical field [0001] The invention relates to the technical field of aluminum smelting, in particular to a method for adding carbon to phosphorus pig iron used in the assembly of prebaked anodes. Background technique [0002] The prebaked anode for aluminum electrolysis is formed by connecting the anode carbon block and the aluminum guide rod by casting phosphorus pig iron water in the gap between the steel claw of the aluminum guide rod and the carbon bowl of the carbon block, and the phosphorus pig iron plays the role of connection and conduction. Phosphorus pig iron water can be cast by casting machine or manually. [0003] Phosphorus pig iron needs to have good bonding strength to steel claws and carbon materials, good electrical conductivity, certain brittleness and low thermal expansion coefficient. The carbon content of phosphorus pig iron has a great influence on the performance of phosphorus pig iron in all aspects: the higher the carbon content, the better the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/08C25C3/12C25C3/16
Inventor 肖小兵高小明
Owner 山东信发华源铝业有限公司