Submerged arc refining slag for billet lf refining and its production process and equipment

Abstract

The invention relates to the field of metallurgy technology, in particular to a submerged arc refining slag for billet LF refining, the raw material weight percent composition is: CaCO 3 40‑65% parts, MgO 0‑20% parts, SiO 2 For 5‑10% parts, BaCO 3 0‑20%, Na 2 CO 3 0‑10% parts, SiC 0‑15% parts, CaF 2 for 0‑15% parts. The present invention is mainly used for the submerged arc of the billet in the LF refining process, using carbonate (CaCO 3 、BaCO 3 、Na 2 CO 3 , MgCO 3 ) etc. as the main raw materials, carbonates decompose due to high temperature after entering the molten steel, producing a large amount of CO 2 Bubbles, SiC, C, CaC brought in at the same time 2 etc. and CO 2 The reaction generates CO, so as to obtain a large number of bubbles and realize the purpose of submerged arc.

Description

Technical field [0001] The present invention relates to the field of metallurgy, and more particularly to refinement and production processes and equipment for billet LF refining. Background technique [0002] As the number of waste steel materials, especially the reincarnation of the construction of the construction, the recycled screwed steel smelting silicone steel is the future development trend; in order to reduce production costs, some steel enterprises use the square blank LF refining process to add scrap steel After refining process, although it can reduce ton steel costs, the increase in graphite electrode fracture is increased, and the current delivery is unstable, resulting in high electricity consumption and long refining time, and due to electrodes The arc generated between scrap steel has caused sharp decline in the life of the steel bag. The noise pollution during the production process is serious; [0003] In the LF refining process of the billet, some experts hav...

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Problems solved by technology

[0002] With the sharp increase in the recycling of scrap iron and steel materials, especially rebar used in construction, it is the future development trend to recycle waste rebar to smelt silicon-manganese steel; and in order to reduce production costs, some steel companies have adopted the addition of scrap steel during the billet LF refining process. Post-refining process, although this process can reduce the cost per ton of steel, it will lead to increased graphite electrode fractures and unstable current transmission during the LF refining process, resulting in high power consumption and long refining time. The electric arc generated between the steel scraps causes the service life of the ladle to drop sharply, and the noise pollution in the production process is serious;

[0003] In the LF refining process of billet, some experts and scholars have done a lot of research and application on refining submerged arc foaming, but they are only implemented for the ordinary refining process without adding scrap steel, while in the billet LF refining process For the time being, there is no relevant report on the submerged arc adding scrap steel

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