What is Silicon Barium Inoculant?

What is Silicon Barium Inoculant?

Silicon barium inoculant is used as an inoculant for casting and a deoxidizer for steelmaking. When used as an inoculant for casting, it can promote the formation of Type A graphite, refine the eutectic grains, improve the distribution of graphite, enhance anti-degradation ability, and eliminate and prevent the tendency of white mouth in castings, reducing section sensitivity.

When silicon barium inoculant is used as a deoxidizer for steelmaking, it is smokeless and sparkless, with a deoxidation effect higher than that of silicon calcium alloy. It can also improve the morphology of non-metallic inclusions and improve the quality of steel.

Currently, silicon barium inoculants are produced domestically and internationally by first producing ferrosilicon in a mineral furnace and then adding the ferrosilicon and barium-containing materials to an intermediate frequency furnace. Substituting silicon barium inoculant for 75% ferrosilicon as an inoculant will bring enormous economic benefits.

Silicon Barium Inoculant Manufacturer

Manufacturing Process of Silicon Barium Inoculant:

In a mineral furnace, silicon barium inoculant is smelted in one step, based on smelting 75% ferrosilicon. When producing this product, it is first required that the original production furnace for 75% ferrosilicon operates normally, and the aluminum content should be controlled below 2%. Barytes, limestone, and carbide are mixed in proportion and evenly placed at the furnace platform facing three electrodes, then mixed evenly with 75% ferrosilicon. Within 1.5 hours of each iron tapping (one furnace tapping every 2 hours), the pre-mixed furnace burden is uniformly added to the furnace in batches and stages, and care should be taken to prevent the occurrence of incrustation during smelting. The furnace construction, start-stop process is the same as that for 75% ferrosilicon.

Qualified coke, silica, steel scrap, and weighed additives are mixed, and the mixture is supplied to the furnace platform. After mixing the above mixture with barytes, limestone, and carbide, it is added to the electric furnace for smelting to produce molten iron, and samples are taken for chemical analysis. The qualified products are refined, crushed, packaged, and stored, while the unqualified products are re-smelted.

Raw Material of Silicon Barium Inoculant:

Barytes 10-400 kg, silica 500-600 kg, carbide 0-50 kg, coke 450-550 kg, steel scrap 65-85 kg, limestone 5-10 kg.

The requirements for silica, coke, and steel scrap are the same as those for smelting 75% ferrosilicon. Barytes should contain BaSO4 greater than 70%, with a particle size of 40-60 mm, free from soil, impurities, and good explosion resistance. Limestone should contain CaO greater than 51%, with a particle size of 30-40 mm. Carbide should contain CaC2 greater than 70%, with a particle size of 30-40 mm without powdering. The chemical composition range of silicon barium inoculant is Ba 0-30%, Si 0-70%, Ca 0-4%, and Al less than 2%.

Without the need to add new equipment, silicon barium inoculant can be produced in one step in a mineral furnace, significantly reducing the unit power consumption from 14,000 kWh per ton to 8,600 kWh per ton. The product cost is greatly reduced, and the amount of silicon barium inoculant added is only one-third of that of 75% ferrosilicon while improving the quality of castings, solving problems such as uneven strength caused by large differences in wall thickness, and inoculation decline due to production layout restrictions and long casting process routes, thereby improving product quality.


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