Ferrosilicon magnesium nodularizer (FeSiMg) is used to produce graphite castings. However, in production, the different particle sizes of nodularizer (FeSiMg), production processes, processing equipment, and molten iron processing volume will lead to different finished products. So, considering comprehensively, what particle size of nodularizer(FeSiMg) is more suitable for production? The following are some basic selection methods:
According to the amount of molten iron processed
- Large amount of molten iron processing: When the amount of molten iron processed is large, such as batch production in the medium frequency furnace and other equipment of large foundries, it is advisable to select a nodularizer with a larger particle size, generally 10-25mm. The nodularizer with a larger particle size dissolves and reacts relatively slowly in the molten iron, and can continue to play a nodularizer role for a long time, ensuring the stability of the nodularizer effect. At the same time, the large-particle nodularizer is not easily submerged by the molten iron quickly, which is conducive to the full reaction and improves the absorption rate of the nodularizer.
- Small amount of molten iron processing: For small cupolas or manual processing of a small amount of molten iron, a nodularizer with a smaller particle size, such as 5-10mm, can be selected. Because the amount of molten iron is small and the reaction speed is relatively fast, the nodularizer with a smaller particle size can fully contact and react with the molten iron in a shorter time, achieving a better nodularizer effect. Moreover, the small-particle nodularizer can be evenly dispersed in the molten iron when added in a small amount, avoiding uneven nodularizer due to local concentration of the nodularizer.
According to the treatment equipment
- Use subcontracting treatment: During subcontracting treatment, the molten iron has a certain rolling and stirring effect in the bag, and the nodularizer and the molten iron are in full contact. In this case, a medium-sized nodularizer can be selected, such as 8-15mm. The nodularizer with moderate particle size can not only quickly mix and react with the molten iron under the stirring effect of the subcontracting bag, but also ensure the continuous release of nodularizer elements within a certain period of time, so that the nodularizer reaction proceeds smoothly.
- Use the flushing method for treatment: The flushing method is to put the nodularizer at the bottom of the molten iron bag, and then flush the molten iron for nodularizer treatment. At this time, in order to enable the nodularizer to quickly contact and react with the molten iron, a nodularizer with a slightly smaller particle size can be selected, generally 5-12mm. Smaller particle size can increase the contact area between the nodularizer and the molten iron, so that the nodularizer reaction can be started in a shorter time and thenodularizer efficiency can be improved.
Reference casting characteristics
- Production of thick and large castings: Thick and large castings take a long time to solidify, and the nodularizer needs to continuously provide nodularizer elements for a long time to ensure the nodularizer effect of graphite nodules inside the castings. Therefore, for thick and large castings, a nodularizer with a larger particle size, such as 12-25mm, should be selected to allow the nodularizer to slowly dissolve and react in the molten iron to avoid the occurrence of nodularizer decay.
- Production of thin-walled castings: Thin-walled castings solidify quickly, requiring the nodularizer to work quickly so that graphite nodules are formed in a short time. At this time, it is advisable to use a nodularizer with a smaller particle size, such as 5-10mm, so that the nodularizer reaction can be completed quickly before the molten iron solidifies to obtain a good nodularizer effect.
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