Process for producing high purity pig iron by molten iron injection, vacuum degassing and electrode heating

Abstract

The invention relates to a process for producing high purity pig iron by molten iron injection, vacuum degassing and electrode heating, and belongs to the technical field of high purity pig iron casting. The purpose of desulfurization, dephosphorization, manganese removal and titanium removal of molten iron is achieved by injecting of a desulfurization and dephosphorization agent into the molten iron through an injection system, adding of an oxidizer and a manganese removal agent through a top feeding system, and oxygen blowing through a oxygen blower at an appropriate injection speed, feedingspeed, oxygen blowing quantity and oxygen blowing speed. Residual gas impurities and oxygen in the molten iron are removed by the vacuum degassing principle to ensure the compactness of a finished product; silicon, calcium and other deoxidizers are used to remove the residual oxygen in the molten iron to ensure the apparent quality of the finished product; and an electrode heating technology is used to increase the temperature after treatment of the molten iron, and higher than 1450 DEG C of pouring temperature of cast iron can be ensured. The advantages lie in further improving the purity ofthe molten iron and ensuring the internal quality of the finished product. The process has a good application prospect in the production of high purity pig iron for high-end casting.

Description

technical field [0001] The invention belongs to the technical field of high-purity pig iron casting, and in particular provides a process for producing high-purity pig iron by blowing molten iron, vacuum degassing, and electrode heating, which is suitable for pouring production of high-quality high-purity pig iron. Background technique [0002] In recent years, with the rapid development of my country's foundry industry, the demand for high-quality high-purity pig iron is increasing day by day. At present, my country's high-quality high-purity pig iron for foundry mainly relies on imports from Canada, South Africa, Japan and other countries. In recent years, a small number of domestic foundry pig iron smelting enterprises have been able to produce this product in small batches by strictly controlling raw materials, adjusting blast furnace production technology and assisting other means. low-end products. There are also individual enterprises trying to remove impurity element...

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Problems solved by technology

However, this feature does not indicate the means to control the temperature of molten iron, and there is still a certain gap between the composition control of the treated molten iron and the imported high-purity pig iron (the main components of the imported South African pig iron are shown in the above table)

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