One Of The High Level Materials Ferro Chrome

High-energy ball milling can increase the reaction rate of high carbon ferromanganese and Fe3O4, with the optimal milling time being 45 hours. During vacuum sintering at temperatures between 1100 and 1350°C, the chromium content of high carbon ferromanganese rises initially with temperature and then decreases, while the carbon content first decreases and then rises. At 1200°C after 3 hours of sintering, the carbon and chromium contents in ferro chrome are 1.05% and 43.81%, respectively.

1.The determination of chromium in ferro chrome is crucially dependent on the decomposition of the sample. For ferrochrome with a carbon mass fraction of less than 4%, a mixture of sulfuric acid (1+9), dilute phosphoric acid, and sulfuric-phosphoric mixed acid is commonly used for decomposition, while nitric acid is used to oxidize carbides. For high-carbon ferrochrome with a carbon mass fraction greater than 4%, it is generally melted at high temperatures around 800°C using sodium peroxide and sodium hydroxide, which can be cumbersome. During melting, the sample is very prone to spilling, leading to analysis failure; in the case of acid dissolution, a smaller particle size is required, and some must pass entirely through a 300-mesh sieve, often necessitating dilute acid, such as sulfuric acid (1+20) for decomposition, which can take several days to completely decompose the sample.

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