AOD+VOD duplex smelting process and device for low-carbon ferrochrome

Abstract

The invention discloses an AOD+VOD duplex smelting process and device for low-carbon ferrochrome. The device comprises a movable AOD argon-oxygen converter with a top oxygen lance, wherein a bottom (side) oxygen lance is arranged at the bottom of the argon-oxygen converter, the top oxygen lance, a gas collecting hood and a feeding device are arranged above the argon-oxygen converter, a vacuum hoodis arranged above a VOD vacuum station, the vacuum hood is connected with a vacuumizing device, and a feeding device is arranged at the upper end of a furnace opening. A process of AOD+VOD duplex smelting of low-carbon ferrochrome comprises a molten ferrochrome preparation process, a rapid decarburization AOD refining process, a cooling process by adding a cooling material, a vacuum negative pressure bottom oxygen decarburization VOD refining process, a vacuum negative pressure carbon deoxidation refining process, a reduction refining process and a detection and warehousing process. Accordingto the process provided by the invention, a new process of hot charging of molten ferrochrome is adopted, and oxygen, nitrogen or argon, and a mixed gas of nitrogen and oxygen or argon and oxygen areblown in through special refining equipment to directly smelt low-carbon ferrochrome; and the process has the advantages of short smelting period, no power consumption, good product quality, less impurities, energy conservation, environmental protection and the like.

Description

technical field [0001] The invention relates to the technical field of smelting ferrochrome, in particular to a process and a device for smelting low-micro-ferrochrome in combination with AOD+VOD. Background technique [0002] Chromium is one of the important alloying elements in steel materials. Chromium can change the strength, hardness, wear resistance and heat resistance of steel materials and other properties. Important alloy raw materials for castings. [0003] Production of low-carbon ferrochrome At present, Si-Cr alloy plus chromium ore powder is widely used at home and abroad, and low-micro ferrochrome is produced through refining electric arc furnace. Since the smelting of Si~Cr alloys consumes a lot of electric energy, if ferrochrome cannot be charged with hot water, it will consume more electricity and increase the cost. At present, oxygen blowing and decarburization in converters are also used for refining. However, considering the serious oxidation of Cr, the ...

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Problems solved by technology

Since the smelting of Si-Cr alloys consumes a lot of electric energy, if ferrochrome cannot be charged with hot water, it will consume more electricity and increase the cost. At present, converter oxygen blowing decarburization is also used for refining, but considering the serious oxidation of Cr, generally the main production is carbon ≥ 2.0% medium carbon ferrochrome

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