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How to choose the spheroidizer?

Nodularizer is widely used in foundry field, can promote in the ball mill cast iron into the spherical graphite crystals additives, get the favour of the foundry customers, but the quality of the products on the market is uneven, as a type of nodularizer, offer but differ a lot, greatly increases the difficulty to select high-quality nodularizer, star metallurgy factory technical engineers today as we summarize several tips to judge the quality of nodularizer, come and look at it together;