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Prevention method of molten iron oxidation during smelting iron in cupola

A technology of cupola and molten iron, which is applied in the field of measures to prevent oxidation of cupola molten iron, can solve problems such as poor fluidity of molten iron and affect the internal quality of products, and achieve the effects of improving casting quality, saving raw materials, and reducing environmental pollution

Inactive Publication Date: 2010-03-24
韦星野
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Problems solved by technology

The molten iron is oxidized, resulting in poor fluidity of the molten iron, which seriously affects the internal quality of the product

Method used

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  • Prevention method of molten iron oxidation during smelting iron in cupola

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Embodiment Construction

[0007] The reaction of carbon in a cupola: C+O 2 →CO 2 , CO+C→CO 2 , Since the activation ability of carbon and oxygen to generate carbon dioxide is lower than that of carbon monoxide, carbon dioxide is mainly generated in the oxidation zone where free oxygen exists. Under certain conditions, the height of the oxidation zone is greatly affected by the wind volume. Generally, when the coke consumption is constant, with the increase of the air supply volume, the oxidation zone of the cupola grows, and the C+O 2 →CO 2 The trend increases, the oxidizing atmosphere in the furnace increases, and the oxidizing property of molten iron increases. The greater the air volume, the stronger the degree of oxidation. Therefore, the air supply volume must be calculated.

[0008] 1. Reasonably design the air outlet

[0009] For small and medium-sized cupolas (3-5) t / h, each row of tuyere is designed with 6-8 outlets, the upper tuyere is slightly smaller than the lower tuyere, and the up...

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Abstract

The invention discloses a method for preventing the molten iron oxidation in a cupola, aiming to increase the liquidity of molten iron, improve the quality of molten iron, save the material and meet the demand of mass production. The design of the air port is reasonable, the upper air port is smaller than the lower air port which is 1.25 times of the upper air port, the total air port ratio is 3.0%-3.1%; the interval of the two air ports is the effective diameter of the combustion chamber at the main air port; the optimal supply air strength is 150-160m<3> / m<2>.min.

Description

technical field [0001] The invention relates to a measure for preventing the oxidation of molten iron in a cupola furnace, which helps to enhance the fluidity of molten iron, improve the internal quality of molten iron, save materials and meet the needs of mass production. Background technique [0002] At present, under the condition that the structure of the cupola is reasonable, the oxidation of molten iron in the cupola is generally related to the charge, the ratio of iron to coke, and the intensity of the air supply. The purity of the charge has a certain influence on the oxidation of molten iron in the cupola. When there are many impurities in the charge, part of the oxides will enter the slag during the smelting process, which will aggravate the oxidation of the molten iron. In addition, the size of the material block also has an impact on the smelting oxidation. ; The key factor affecting the oxidation of molten iron is caused by improper air supply intensity. The mo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27B1/16
Inventor 韦星野
Owner 韦星野
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