Co-produced Byproduct Of The Silicon Metal： High Carbon Silicon

High carbon silicon (silicon carbon alloy) is a co-produced byproduct of the silicon metal smelting process. During electric furnace production, reaction temperatures at the furnace bottom and walls often fail to consistently reach the theoretical threshold required for complete melting; consequently, some raw materials adhere to the furnace lining without fully reacting. Subsequent separation and processing yield a silicon-carbon alloy with a specific chemical composition.

Application Optimization Strategy:
Steelmakers face profit margin pressures due to the limited raw material mix typical of traditional converter alloying processes-where, for instance, Q195/Q235 series steels rely on combinations of silicomanganese, ferrosilicon, and composite deoxidizers, while HRB series steels rely on silicomanganese, ferrosilicon, and recarburizers-compounded by tightening supplies and high procurement costs for these traditional additives. Crucially, the recovery rates of traditional alloys are highly susceptible to fluctuations in operating conditions such as tapping weight, end-point temperature, and slag carryover; this leads to imprecise control over the final product's composition and lower internal quality pass rates.

Against this backdrop, high carbon silicon is increasingly being adopted as a novel alloying agent in mainstream production processes. Typical specifications include a particle size of 10–100 mm or 10–60 mm (with 90% within this range), and mainstream grades feature silicon content ≥65% with carbon ≥15%, or silicon ≥68% with carbon ≥18%. To enhance melting kinetics, it is recommended to place the high carbon silicon at the bottom of the converter or ladle prior to tapping. Leveraging the powerful impact energy and thermal convection of the molten steel ensures rapid, uniform melting, thereby stabilizing alloy recovery rates and reducing overall steelmaking costs.

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