Process for smelting common silicomanganese alloy by smelting electric furnace to quickly convert high-silicon silicon-manganese alloy

Abstract

The invention discloses a process for smelting common silicomanganese alloy by a smelting electric furnace to quickly convert high-silicon silicomanganese alloy, which belongs to the technical field of ferroalloy production, and particularly relates to a process for smelting different varieties of silicomanganese alloys to solve the problems of a long transition period and more transition productsof the common silicomanganese smelting high-silicon silicomanganese alloy. The process comprises the following steps of: (1) proportioning; (2) preparing before transition smelting; (3) adjusting thecoke type; (4) ensuring that the high-silicon silicon-manganese material can enter the smelting electric furnace at the same time one day before transition smelting; (5) making the basicity of the slag in the transition period of transition smelting to be 1.1 times of the basicity in the conventional transition smelting process; (6) enabling tapping time to be not shorter than 40 min; and (7) dephosphorizing outside the smelting electric furnace, adding lime powder or fluorite powder when the liquid level of slag iron in the ladle reaches 1 / 3, and stopping adding until the P component in thehigh-silicon silicomanganese alloy reaches the standard. The transition period of transition smelting is shortened to be within one day, the alloy quality cashing rate is increased by 20% or above, the recovery rate is increased by about 2%, transition products are few, and various consumptions are greatly reduced.

Description

technical field [0001] The invention relates to a process for smelting ordinary silicon-manganese alloys and quickly converting high-silicon-manganese alloys into high-silicon-manganese alloys in a submerged arc furnace. Background technique [0002] Silicon-manganese alloy is an alloy composed of manganese, silicon, iron and a small amount of carbon and other elements. It is a ferroalloy with wide application and large output. Manganese-silicon alloy is a compound deoxidizer commonly used in steelmaking, and it is also a reducing agent for the production of medium and low carbon ferromanganese and the production of metal manganese by electrosilicothermal method. [0003] High silicon silicon manganese, also known as low carbon silicon manganese. As a name, it is different from ordinary silicomanganese, first of all, it is different from ordinary silicomanganese in elemental composition: high silicon silicomanganese generally contains high silicon (Si>22%), and the conte...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a process for smelting ordinary silicomanganese alloys into high-silicon-silicon-manganese alloys quickly in a submerged arc furnace, so as to solve the problems of long transition period and many transitional products in the conversion of ordinary silicomanganese to high-silicon-silicon-manganese alloys