Production method of ultra-low-aluminum high-purity industrial pure iron

Abstract

The invention discloses a production method of ultra-low-aluminum high-purity industrial pure iron. The production method comprises the following steps: (1) pre-desulfurizing molten iron; (2) a converter; (3) LF refining; (4) RH vacuum treatment; (5) continuous casting; the converter uses self-produced low-sulfur plain carbon waste steel and a double-slag dephosphorization and demanganization process, and low-temperature and high-oxygen content control is adopted at the end point; high oxidability of molten steel and slag is kept in the converter tapping and LF refining process, and phosphorus and manganese in steel are removed through LF refining oxidation; after RH vacuum decarburization, aluminum is added for deoxidation, the aluminum content of molten steel is 0.013-0.017%, the aluminum content in the steel is further reduced through the secondary oxidation effect of slag on the molten steel, the Al content in a finished product is within 0.005%, and the oxygen content is controlled to be below 0.005%; and the content of the industrial pure Fe element reaches 99.92% or above.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to an ultra-low-aluminum high-purity industrial pure iron production method. Background technique [0002] Industrial pure iron is a kind of steel, and it is required that the content of elements other than Fe in the steel should be as low as possible. The Fe content of high-purity industrial pure iron can reach more than 99.90%. It is a typical high-tech value-added product and is used for the preparation of rare earth permanent magnet materials and amorphous materials. Ultra-low aluminum industrial pure iron requires that the Al content in steel is not more than 0.005%, and it is mainly used in downstream industries such as advanced amorphous materials that have strict requirements on inclusion content. Aluminum is an important material for deoxidizing molten steel in steelmaking production. The aluminum content in aluminum-killed steel must be above 0.015% to ens...

AI Technical Summary

Problems solved by technology

This method uses rare earth lanthanum cerium alloy for deoxidation. On the one hand, it increases the cost of the deoxidized alloy. At the same time, the rare earth deoxidized product is not easy to float and remove, which reduces the cleanliness of pure iron. In addition, the total amount of rare earth elements reaches 0.005-0.015%, which reduces the cost of industrial pure iron. purity

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