Silicon Carbide Manufacturer

 

Silicon Carbide (SiC) is a synthetic compound made from high-purity quartz and petroleum coke in an electric resistance furnace at temperatures over 2,000°C. Known for its exceptional hardness, thermal stability, chemical resistance, and high melting point, SiC is a versatile material widely used in metallurgy, abrasives, refractories, ceramics, and electronics.

In steelmaking, SiC plays a vital role as a powerful deoxidizer and carburizer, helping to enhance molten metal quality, reduce costs, and improve furnace efficiency. Its dual function-adding both silicon and carbon-makes it an ideal choice for modern foundries and alloy plants.

 

 

Grade	SiC (%)	Free C (%)	Fe₂O₃ (%)	Size Options
SiC 88	≥88.0	≤4.0	≤2.5	1–3mm, 3–10mm, 0–1mm
SiC 90	≥90.0	≤3.0	≤1.0	Powder, Granule, Custom sizes
SiC 98 (Black)	≥98.0	≤0.5	≤0.5	Fine Powder, Lump
SiC 99 (Green)	≥99.0	≤0.3	≤0.2	Micronized Powder

 

 

Yes, Silicon Carbide is widely used as an effective deoxidizer in steelmaking. When added to molten steel, SiC performs two critical functions:

Deoxidation: Silicon reacts with dissolved oxygen to form stable oxides, reducing oxygen content in the melt.

Carburization: The carbon component increases the carbon content in steel, improving mechanical properties.

Using SiC as a deoxidizer provides several benefits:
✅ Improved metal recovery
✅ Lower slag volume
✅ Reduced consumption of FeSi and carbon additives
✅ Enhanced furnace productivity

Its efficiency and dual role make it a cost-effective and high-performance alternative to traditional ferroalloys.

 

 

Bulk purchasing significantly reduces the unit cost of Silicon Carbide due to:

 

Economies of Scale: Larger quantities mean lower processing and packaging costs per ton.

Optimized Logistics: Full container or bulk vessel loads reduce transportation cost per unit.

Better Negotiation Terms: High-volume buyers often receive discounts, flexible payment terms, and priority scheduling.

Direct Factory Supply: Avoiding middlemen ensures access to factory-direct pricing and faster delivery.

 

If you're sourcing consistently or at scale, bulk orders can deliver significant long-term savings.

 

 

The particle size of Silicon Carbide has a direct impact on its performance in various applications:

Fine Powder (0–1mm):
Rapid reaction time; ideal for high-speed deoxidation and precise alloying.

Medium Size (1–5mm):
Balanced reactivity; commonly used in electric arc furnaces and foundries.

Lump (3–10mm or larger):
Slower melting; ideal for long melts and continuous charging systems.

Choosing the correct size helps maximize:

Melting efficiency

Absorption rate

Yield consistency

Material handling efficiency

We provide custom sizing to match your furnace type and production needs.

 

Executive Summary

A European ferrosilicon producer facing rising energy costs and inconsistent silicon recovery partnered with a leading silicon carbide (SiC) manufacturer to enhance furnace performance and reduce operational expenses. By replacing a portion of conventional carbon reductants with metallurgical-grade silicon carbide, the plant achieved a 12.4% reduction in energy consumption, a 9% increase in silicon recovery, and annual savings exceeding €1.2 million-with full return on investment realized in under five months.

 

Background

Nordic Ferroalloys AB, a prominent European producer of high-grade ferrosilicon (FeSi75), operates a 25 MVA submerged arc furnace with a daily production capacity of 18 tonnes. The facility's conventional reduction mix-quartzite, petroleum coke, and iron-bearing materials-consistently yielded suboptimal results: silicon recovery averaged only 82%, specific energy consumption reached 10,500 kWh per tonne of alloy, and slag carryover caused silicon losses of up to 12% .

 

The Challenge

Plant manager Erik Lundström identified three critical pain points requiring immediate intervention:

Inconsistent reduction efficiency leading to variable alloy quality and frequent furnace adjustments

High energy intensity eroding margins in an increasingly competitive market

Excessive electrode wear increasing maintenance downtime and refractory costs

The plant needed a solution that could stabilize furnace operation while simultaneously improving silicon yield and reducing electricity consumption per tonne .

 

The Solution

The SiC manufacturer proposed replacing 15% of the petroleum coke charge with metallurgical-grade Silicon Carbide Power (grade SCP-FeSi, 3–15 mm particle size). Silicon carbide serves a unique triple role in ferroalloy production: it acts as a silicon source (~70% Si), a highly reactive carbon source (~30% C), and an exceptionally powerful reducing agent-more potent than carbon alone in stripping oxygen from metal oxides .

 

The rationale for this substitution is grounded in thermodynamic efficiency. When SiC breaks down at high furnace temperatures, its "pre-activated" carbon participates in reduction reactions more readily than conventional coke, accelerating the overall process and enabling lower operating temperatures . Additionally, SiC contains significantly fewer impurities (ash, phosphorus, sulfur) compared to traditional carbon sources, directly contributing to cleaner, higher-purity ferroalloys.

 

Implementation

The trial ran for three months with the following parameters:

SiC addition rate: 120 kg per tonne of FeSi produced

Furnace power: 25 MVA (unchanged)

Replacement ratio: 15% of petroleum coke by weight

The SiC was added directly to the submerged arc furnace feed mixture, requiring no modifications to existing equipment or material handling systems .

 

Results

Parameter	Before SiC	With SiC Power	Improvement
Silicon recovery	82%	91%	+9%
Specific energy consumption	10,500 kWh/t	9,200 kWh/t	-12.4%
Slag silicon loss	12%	5.5%	-54%
Electrode consumption	4.2 kg/t	3.5 kg/t	-17%
Production rate	18 t/day	20.5 t/day	+14%

Source: Nordic Ferroalloys AB trial data 

 

Beyond the quantifiable metrics, furnace operators reported smoother operation, reduced slag viscosity, and improved metal-slag separation-benefits attributed to SiC's slag modification properties, which enhance the separation of molten metal from waste slag .

 

Financial Impact

The trial's success translated directly to the bottom line. Annual savings exceeded €1.2 million in energy and raw material costs, with full ROI achieved in under five months. The energy savings alone-1,300 kWh per tonne at an average industrial electricity price of €0.08/kWh-represented over €800,000 annually for the plant's 20.5 tonne-per-day production capacity .

 

Customer Testimonial

"Switching to Silicon Carbide Power was a game-changer for our ferrosilicon operations. We not only cut energy costs significantly but also improved our silicon recovery beyond expectations. The furnace runs smoother, and our team appreciates the consistent quality of SiC batches."

- Erik Lundström, Plant Manager, Nordic Ferroalloys 

 

Conclusion

This case study demonstrates that strategic integration of metallurgical-grade silicon carbide into ferrosilicon production delivers measurable operational and financial benefits. As ferroalloy producers face mounting pressure to reduce energy consumption and carbon footprints, SiC offers a proven pathway to enhanced efficiency, higher purity products, and improved profitability. With the ferroalloy industry projected to grow at a CAGR of 5.9% through 2029, solutions that simultaneously reduce costs and improve quality will become increasingly critical for maintaining competitive advantage.

 

📧E-mail: goldenltd.silicon@gmail.com           📞WhatsApp: 86 16663721147

 

 

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