RH vacuum refining method for raising yield of antimony element

Abstract

The invention relates to a RH vacuum refining method for raising yield of antimony element. After RH refining alloying for 5 min, an antimony ingot is separately added from the top of ladle slag; through slag coverage, the antimony ingot is avoided from being directly exposed in the air and in a vacuum chamber under the low atmospheric pressure condition; and simultaneously, lumpiness of the antimony ingot and top slag content are controlled and it is ensured that most antimony element is molten in molten steel. Thus, gasification amount of antimony element is minimized, and yield of antimony element is obviously raised. In comparison with an existing RH vacuum refining technology, the method provided by the invention creates beneficial conditions for gasification of antimony ingots, remarkably raises yield of antimony element, reduces production cost and realizes considerable economic benefit.

Description

technical field [0001] The invention belongs to the field of molten steel refining outside the furnace, and in particular relates to an RH vacuum refining method for increasing the yield of antimony element. Background technique [0002] Antimony (Sb) has a silver-white metallic luster, a scaly crystal structure, brittle and hard, brittle, non-ductile, and poor mechanical properties. It has a melting point of 630°C and a boiling point of 1590°C. It is a non-ferrous metal that is fusible and volatile. Sb element is relatively stable and not easy to be oxidized. Al, Si, Mn, Fe, etc. existing in molten steel can reduce antimony oxides, and Sb element is almost not oxidized by FeO, MnO, etc. in slag when added to molten steel. As a large atomic surface active element, antimony can make the material obtain larger grain size, higher hardness, and promote the formation of a texture that is beneficial to the magnetic properties of the material after being added to the steel. When ...

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Problems solved by technology

In addition, due to the addition of alloying elements at the same time, the cycle time of Sb in the RH device is long, and the gasification amount is significantly increased.

[0008] In the process of RH vacuum refining, the yield of Sb is low, a large amount of Sb is wasted, and the refining energy consumption is high, which is not conducive to energy saving and emission reduction, cost reduction and efficiency increase

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