Try link to:Similars in:
FeSi-15 was produced by melting the high-grade crude ferrosilicon (FeSi-75) and diluting it with low-carbon steel scrap in a 3.5 t medium-frequency coreless induction furnace (Table IV). Four different types of crude ferrosilicon (Feeds 1-4, Table IV) with different impurity ratios were used to establish the effect of these impurities on the thickness and texture of accretion build-up. XRD analysis confirmed that all four feed ferrosilicon samples consisted of silicon (Si) and ferdisilicide (FeSi2) as crystalline phases. The main alloying component in the steel was manganese (0.29 mass%), while the crude ferrosilicon contained aluminium, calcium, and manganese in trace amounts (Table IV). The aluminium content in the crude ferrosilicon varied between 0.6 and 2.8 mass%, the calcium between <0.001 and 0.1 mass%, and the manganese between 0.1 and 0.2 mass%. The different ferrosilicon feeds were classified according to impurity aluminium and calcium concentrations as follows: Feed 1 as medium Al and low Ca, Feed 2 as medium Al and low Ca, Feed 3 as high Al and zero Ca; Feed 4 as medium Al and medium Ca. The Ca/Al mass ratios in the different feeds thus varied between 0.00 and 0.14. The start-up of all four tests followed the same procedure: from the batching plant low-carbon steel shredded scrap was added first into holding bins, followed by the FeSi-75. The batched recipe was then loaded into a vibrating feeder. Since the shredded scrap was at the bottom of the bin, it came in contact with the hearth of the furnace first. More low-carbon steel was required to produce the product grade of FeSi-15 in Feed 1 as the raw FeSi-75 of Feed 1 was very enriched in silicon (> 86 mass%).