High Level Alloy Ferro Silicon

Ferro silicon is one of China's major export products and is widely used in steelmaking, casting, and non-ferrous metal industries. It is a good deoxidizer, alloying agent, and additive. Therefore, determining the silicon content in silicon iron is very important. Currently, the main methods for determining the silicon content in silicon iron include the perchloric acid dehydration gravimetric method, animal glue coagulation gravimetric method, potassium silicofluoride volumetric method, density method, and silicomo blue photometric method.

1.The spheroidizing agents produced from rare earth ferro silicon alloys melted using different smelting methods have different effects on the spheroidization of graphite in cast iron. The experimental results show that spheroidizing agents produced from rare earth silicon-iron alloys melted by either one-step or two-step methods can successfully produce ductile iron. However, under the conditions of this experiment, the spheroidizing agent produced from rare earth silicon-iron alloy melted by the one-step method has a significantly better spheroidization ability for cast iron compared to the spheroidizing agent made from the two-step method.Using the new technology of rapid combustion synthesis, fine powder of FeSi75 silicon iron with a particle size of ≤0.088mm was used as raw material. Under a low nitrogen gas pressure of 0.2MPa and a combustion temperature of 1400℃, fine honeycomb-like silicon nitride iron was prepared. XRD and SEM analyses indicated that this silicon nitride iron is mainly composed of short-columnar β-Si3N4 phase and Si3Fe phase, with a structural characteristic of Si3Fe forming the core and being encapsulated by Si3N4. Meanwhile, thermodynamic principles were also used to explore the process conditions for synthesizing silicon nitride iron from silicon iron via rapid combustion, the forms of the products formed, the intermediate products of the reaction, and the morphology of the residual metal.

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