Silicon Carbide Lump
The Starting Point of Every SiC Product
Raw, unprocessed SiC blocks from Acheson furnace discharge. The primary material that feeds every downstream product—grain, grit, and powder. High purity, dense crystal structure, flexible processing.
SiC Lump
Raw furnace blocks
≥50 mm
SiC Grain
Crushed coarse grains
1–5 mm
SiC Grit
FEPA-graded abrasive
0.1–1 mm
SiC Powder
Micro-powders
F8–F1500
Technical Data
Silicon Carbide Lump Specifications
Core physical and chemical parameters of FerrumX SiC lumps—the raw form that determines downstream product quality.
| Parameter | Specification | Why It Matters |
|---|---|---|
| Product Type | SiC Lumps / Crude Blocks | Raw form for further crushing, screening, grading |
| Typical Size | ≥50 mm (custom sizes available) | Large chunks preserve crystal integrity for controlled crushing |
| Color Options | Black SiC / Green SiC | Black: cost-effective bulk; Green: higher purity precision |
| SiC Content | ≥98.8% (typical) | High purity ensures consistent chemistry in downstream products |
| Crystal Structure | α-SiC (hexagonal) | Dense crystalline structure fractures into sharp-edged grains |
| True Density | ≥3.20 g/cm³ | Indicates full SiC crystallization and minimal porosity |
| Bulk Density | ≥1.62 g/cm³ | Important for transport cost and storage volume planning |
| Mohs Hardness | 9.2 | Second hardest industrial material after diamond and boron carbide |
| Electrical Conductivity | Good (black SiC) | Enables use in electrical heating elements and semiconductor substrates |
| Production Method | Acheson resistance furnace | 2,500°C+ furnace reaction for full crystallization |
| Raw Materials | Quartz sand, petroleum coke, carbon additives | Controlled input chemistry = controlled product chemistry |
Acheson Furnace
From Furnace to Lump: The Origin of SiC
SiC lumps are the direct product of the Acheson furnace—the only form that exists before any downstream processing begins.
1
Raw Material Charging
High-purity quartz sand (SiO₂) and petroleum coke (C) are carefully blended with carbon additives. The mixture is loaded into the Acheson resistance furnace core.
2
High-Temperature Reaction
Electric current heats the furnace core to 2,500°C+, triggering the reaction: SiO₂ + 3C → SiC + 2CO↑. The process runs for 5–7 days, allowing full crystallization into α-SiC hexagonal structure.
3
Furnace Discharge & Classification
After cooling, the crystalline mass is discharged. Primary-grade crystal blocks (≥98.8% SiC) are manually separated from graphite cores and unreacted charge. Secondary material is graded for metallurgical applications.
4
QC & Batch Traceability
Each batch undergoes chemical analysis (SiC%, F.C.%), visual crystal inspection, and density verification. Batch numbers are assigned for full traceability from furnace to delivery.
SiO₂ + 3C → SiC + 2CO↑
Temperature: 2,500°C+
Duration: 5–7 days
Furnace type: Acheson resistance
FerrumX capacity: 2 × 40,000 KVA
Annual output: 120,000 tonnes
Crystal result: α-SiC hexagonal
Purity range: ≥98.8% SiC
Key Properties of SiC Lumps
Three advantages that make SiC lumps the preferred starting point for industrial processing.
High & Stable Purity
Consistent SiC content ensures reliable downstream chemistry. Low impurity profile (F.C.%, Fe₂O₃%) means predictable performance in every grain, grit, and powder produced from the same lump batch.
Dense Crystal Integrity
Formed under 2,500°C+ furnace conditions, the dense hexagonal crystal structure allows lumps to fracture in a controlled manner during crushing—producing sharp-edged grains with minimal excessive fines.
Processing Flexibility
By purchasing lumps, customers control particle size distribution, purity blending, and grading strategies in-house. The most cost-efficient and flexible form for companies with their own crushing or screening facilities.
Applications
SiC lumps serve three core industrial roles as raw material, refractory feedstock, and custom processing input.
Bonded & Coated Abrasives
Grinding wheels, cutting discs, coated abrasives, and blasting media for non-ferrous metals, stone, glass, and ceramics. Black SiC’s sharp crystal edges provide fast material removal and consistent surface finishing.
Recommended: B-SiC 97–99 · F12–F220 → SiC Abrasives →
Refractory & Metallurgical Feedstock
High-purity lumps are applied in refractory formulations and metallurgical processes requiring controlled chemistry and thermal stability—castables, ramming mixes, and furnace-related applications.
In-House Processing & Cost Optimization
Companies with their own crushing or grading facilities purchase lumps for cost efficiency and processing flexibility—tailoring output to match specific production requirements without pre-graded markup.
Packaging & Delivery
Bulk Packaging & Global Logistics
SiC lumps are shipped in bulk industrial packaging—designed for large-scale operations and long-distance transport integrity.
Jumbo Bags (1–1.5 T)
Standard: 1,000–1,500 kg per bag · Custom sizes available
Custom Bulk Containers
Volume: Project-based · Full batch traceability
Scheduled & JIT Delivery
Global shipping · Customs documentation · Shipment tracking
Why Choose FerrumX SiC Lumps
Five reasons FerrumX is the preferred raw SiC supplier for refractory, metallurgical, and abrasive processors worldwide.
Direct Furnace Output
120,000 t/yr Supply
Stable Chemistry
Processing Flexibility
Full Traceability
FAQ
Frequently Asked Questions
Silicon carbide lumps are raw, unprocessed SiC blocks produced directly from the Acheson electric resistance furnace at temperatures exceeding 2,500°C. They are typically ≥50mm in size with ≥98.8% SiC purity and serve as the starting material for all downstream SiC products—grains (1–5mm), grit (0.1–1mm, FEPA graded), and micro powder (F8–F1500). Customers with in-house crushing facilities often purchase lumps for cost efficiency and processing flexibility.
SiC lumps are produced by reacting high-purity quartz sand (SiO₂) with petroleum coke (C) in an Acheson resistance furnace at 2,500°C+: SiO₂ + 3C → SiC + 2CO↑. The furnace runs for 5–7 days, forming crystalline SiC blocks within the charge. After cooling, the crystal mass is manually separated from graphite and unreacted charge, then split and graded into primary (≥98.8% SiC) and secondary quality blocks.
Black SiC lumps are produced from silica sand + petroleum coke, yielding dark crystalline blocks with 98.8–99% SiC purity, good electrical conductivity, and lower cost. Green SiC lumps are produced with additional sodium chloride (NaCl) catalyst, yielding bright green crystals with higher purity (97–99.5% SiC), Mohs 9.4–9.5 hardness, and superior chemical purity—but at 2–5× higher cost per ton.
Purchasing SiC in lump form offers three key advantages: (1) Cost savings—lumps are the cheapest form per ton, since no downstream crushing/screening cost is included; (2) Processing flexibility—customers can tailor particle size distribution, purity blending, and grade strategies in-house; (3) Supply control—bulk lump inventory enables just-in-time processing for multiple product grades from a single raw material source.
Each SiC lump production batch undergoes chemical composition analysis (SiC%, F.C.%, Fe₂O₃%), visual inspection for crystal quality, and density measurement. Primary-grade blocks (≥98.8% SiC) are manually separated from secondary material during off-furnace classification. Full batch traceability is maintained from furnace operation through storage and delivery, with certificates of analysis (COA) provided per shipment.
FerrumX delivers SiC lumps in industrial-grade jumbo bags (1–1.5 ton) or custom bulk containers. Each package is labeled with size range (≥50mm), purity (≥98.8%), color type (Black/Green), and batch number. We support scheduled and just-in-time delivery worldwide, with our logistics team coordinating carrier selection, customs documentation, and shipment tracking from factory to customer facility.
