How to Smelt Ferrosilicon from Silicon Slag

Under the global carbon neutrality target, recycling metallurgical by products becomes critical for ferro alloy supply chains. #Hongshun #Hongshunsiliconslag #HongshunSiliconmetalslag

Silicon metal slag is a by product generated from submerged arc furnace production of silicon metal. Instead of landfilling, it can be reused as a secondary raw material for ferrosilicon manufacturing.

Silicon metal slag Typical Composition

•  Elemental Si:45 65%

• SiO₂:20 40%

• Impurities: Al, Ca, Fe, low S & P. Al and Ca from slag will pass into final ferrosilicon products, so precise batching is required. #HongshunSiliconmetalslag

Silicon metal slag Main Applications

1.  Deoxidizer for steel making, partial substitute for ferrosilicon

2. Foundry additive to improve molten iron fluidity

3. Construction material for concrete & road base

4. Raw material for ferrosilicon re smelting #Hongshunsiliconslag

Smelting Principle for Ferrosilicon from Si metal Slag Different from traditional route (quartz + coke + steel scrap), silicon metal slag already contains a large amount of elemental silicon. Inside a submerged-arc furnace at 1600 1900℃, molten Si directly alloys with liquid iron. Oxide impurities float off as waste slag.

This route cuts power consumption and quartz consumption. Yet strict chemical testing is essential to control Al, Ca and phosphorus for export grade FeSi75.

#Ferroalloy #SiliconMetal #Ferrosilicon #CircularEconomy #Metallurgy #Hongshun #Hongshunsiliconslag #HongshunSiliconmetalslag