Rare earth silicon

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Rare earth silicon is used as an inoculant for casting and as a deoxidizer for ironmaking. When used as an inoculant for casting, it can promote the formation of A-type graphite, refine the eutectic group, improve the distribution of graphite, and have strong anti-recession ability. It can eliminate and prevent the whitening tendency of castings and reduce the sensitivity of the section. When rare earth silicon is used as a deoxidizer in ironmaking, there is no smoke and no spark. The deoxidation effect is higher than that of silicon-calcium alloys, and it can improve the shape of non-metallic inclusions , Improve the quality of iron.

At present, the production of rare earth silicon at home and abroad generally adopts submerged arc furnaces to produce rare earth ferrosilicon, and then adds rare earth ferrosilicon and iron-containing raw materials to the intermediate frequency furnace. The method of rare earth silicon is to smelt rare earth ferrosilicon alloy in a submerged arc furnace. Dolomite, silica, lignite, iron filings and silicon carbide are mainly used in the furnace. The power consumption required for smelting is very large, and the power consumption of producing one ton of rare earth ferrosilicon alloy is 14,000 kWh.


The main points of the rare earth silicon production method are: the rare earth ferrosilicon alloy is smelted in a submerged arc furnace at one time, and the process is carried out on the basis of smelting 75% rare earth ferrosilicon. When producing this product, it is first required that the original production of 75% rare earth ferrosilicon furnace is in normal condition, and the aluminum content should be controlled below 2%. Mix dolomite, limestone, and calcium carbide evenly in proportion, and put them in the three electrodes respectively. At the hearth, mix evenly with 75% rare earth ferrosilicon material. Within 1.5 hours of each tapping (one furnace of iron every 2 hours), add the above-mentioned mixed charge into the furnace in batches and stages, and prevent sparks during smelting.