Rare earth ferrosilicon alloy is used as an inoculant for casting and 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. And it can eliminate and prevent the whitening tendency of castings and reduce the sensitivity of the section. When the rare earth ferrosilicon alloy is used as a deoxidizer for ironmaking, there is no smoke and no spark. The deoxidation effect is higher than that of silicon-calcium alloy, and it can improve non-metallic inclusions form, improve the quality of iron. At present, in the production of rare earth ferrosilicon alloys at home and abroad, rare earth ferrosilicon is generally produced in submerged arc furnaces, and then rare earth ferrosilicon and iron-containing raw materials are added to intermediate frequency furnaces. 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.
In view of the shortcomings of high power consumption of rare earth ferrosilicon alloys at domestic and overseas, a production process with low power consumption and optimal furnace charge composition is provided. Adopt this method without improving equipment to reduce the power consumption and cost of rare earth ferrosilicon alloy, so that rare earth ferrosilicon alloy can be widely used as inoculant in the foundry industry, replacing 75% of rare earth ferrosilicon as inoculant, and its economic benefits will be huge.
The rare earth ferrosilicon alloy is smelted in a submerged arc furnace at one time, and this 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. Regarding the furnace construction, start-up and shutdown process, it is the same as the 75% rare earth ferrosilicon process.
Rare earth ferrosilicon alloy process: (1) Mix qualified lignite, silica, iron filings, and weights after weighing: (2) Supply the mixture to the furnace platform: (3) Mix the above mixture with dolomite, limestone, After the radio is mixed, add it to the electric furnace for smelting: (4) Cast the molten iron ingot, and take samples to analyze the chemical composition: (5) Finish and break the qualified products, pack them into storage, and re-smelt the unqualified products.