Silicon Metal Lump 2202 Grade
Silicon Metal Lump 2202 Grade: Ultra-Consistent Metallurgical Silicon for Industrial Production Stability
Unlike standard grade silicon, the 2202 Grade is strictly defined by its maximum allowable impurities under international standards (such as GB/T 2881 and ASTM specifications). The four-digit nomenclature represents the precise ceiling for Iron (Fe), Aluminum (Al), and Calcium (Ca).
Chemical Composition Table
|
Element |
Standard Specifications |
Typical Batch Value |
Function & Impurity Control Significance |
|
Silicon (Si) |
≥ 99.3% or 99.5% |
99.54% |
Base element for alloying and chemical synthesis. |
|
Iron (Fe) |
≤ 0.20% |
0.14% |
Heavily restricted to prevent brittle intermetallic phases in aluminum. |
|
Aluminum (Al) |
≤ 0.20% |
0.12% |
Controlled to ensure precise grain refinement in downstream alloys. |
|
Calcium (Ca) |
≤ 0.02% |
0.008% |
Kept to a minimum to suppress slag formation and nozzle clogging. |
Physical Characteristics & Handling Properties
|
Item |
Specification |
|
Form |
Irregularly crushed metallic lumps |
|
Standard Size Range |
10–100 mm (≥90% within range) |
|
Custom Sizing |
Available upon request (e.g., 10–50 mm, 20–150 mm) to match furnace charging systems |
|
Appearance |
Metallic grey with sharp crystalline luster |
|
Melting Point |
Approximately 1410°C (2570°F) |
|
Fines Control |
Strictly screened before packing; fines (<10 mm) controlled to ≤5% to avoid furnace draft blockage |
Industrial Applications: Solving Downstream Vulnerabilities
Advanced Aluminum Alloy Manufacturing (Automotive & Aerospace Grades)
In the production of Al-Si alloys (e.g., A356, 356, 413), 2202 grade eliminates the risk of hard spots and inclusion defects. The strictly controlled Calcium (Ca) levels prevent the formation of complex dross, ensuring high-fluidity melts and perfect casting integrity for safety-critical automotive components.
Chemical & Silicone Synthesis (Silanes and Intermediates)
For chemical plants producing organosilicons or silanes, trace impurities act as catalyst poisons. The low-iron and ultra-low-calcium profile of our 2202 grade ensures stable reaction kinetics in fluidized bed reactors, maximizing fluidization efficiency and direct synthesis yields.
Specialty Steel Deoxidation & Metallurgy
Acts as a high-purity reducing agent in specialty steel clean-melting practices. Predictable composition allows precise calculation of oxygen removal, avoiding unpredictable steel cleanliness variations.
Manufacturing Quality Control
Our production utilizes advanced Submerged Arc Furnaces (SAF) with high-purity quartz and low-ash petroleum coke/charcoal reductants. However, our consistency is driven by our Batch Segregation Protocol:
Raw Material Fingerprinting: Every lot of quartz is pre-tested for trace Fe and Ca anomalies before entering the furnace.
No Inter-Batch Blending: Molten silicon is tapped, cooled, and crushed in isolated batches. We do not practice "average blending" to fix off-spec batches.
Strict Rejection Thresholds: If a batch tests at 0.21% Fe, it is immediately downgraded to 3303 or 441 grade and completely removed from the 2202 export pipeline.
Certificate
Packaging & Export Logistics
To maintain material stability during global transport:
1MT or 1.25MT jumbo bags with PE moisture barrier liner
Palletized container loading for stability during shipping
Controlled packing to minimize breakage and fines formation
Standard export documentation: MSDS, CO, and customs forms
Proper packaging directly influences furnace yield and handling losses.
FAQ
Q: What does "2202" grade mean?
A: The "2202" grade refers to the maximum impurity limits in silicon metal:
• Fe ≤ 0.2%
• Al ≤ 0.2%
• Ca ≤ 0.02%
The remaining content is high-purity silicon, typically ≥99.3%–99.5% Si.
Q: How do you reduce fines during shipping?
A: Silicon metal is brittle, so fines may form during transport. We reduce this by:
• Using reinforced 1 MT jumbo bags
• Bottom discharge design for controlled unloading
• Strict top-loading rules (no heavy cargo above bags)
• Secure palletized container loading
Q: Do you support third-party inspection?
A: Yes. We support SGS, Intertek, or Bureau Veritas inspection at the loading port. All shipments also include a batch-based COA for full traceability.
Q: Why choose 2202 over 553 or 441 grade?
A: Compared with lower grades, 2202 offers lower impurity levels, which helps:
• Reduce slag and furnace buildup
• Improve casting stability
• Lower scrap risk in aluminum production
This often reduces total production cost, not just material cost.
Q: What if the material is not compliant on arrival?
A: Each batch is traceable and a sealed reference sample is kept for 6 months. If a confirmed deviation occurs based on agreed test methods, we provide replacement or commercial compensation.
Q: Can we get samples before ordering?
A: Yes. We provide 1–5 kg lab samples taken from production batches, along with COA for testing and trial melting.
Conclusion
Silicon Metal Lump 2202 Grade is not positioned as a premium marketing product, but as a process-stable industrial raw material designed for manufacturers who require predictable melting behavior and controlled impurity impact.
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