Product Overview
Silicon slag is an industrial by-product generated during the smelting of metallic silicon and ferrosilicon. It appears as greyish-black metallic lumps, consisting primarily of elemental silicon (Si) and silicon dioxide (SiO₂), with a silicon content typically ranging from 30 per cent to 70 per cent, whilst also containing small amounts of aluminium, iron, carbon, sulphur, phosphorus and other elements.
Although silicon slag is classified as smelting waste, its silicon content is substantial and its price is significantly lower than that of pure silicon and ferrosilicon; consequently, it offers considerable value and economic benefits for recycling and reuse. Currently, silicon slag is widely utilised across numerous industrial sectors.
Key Specifications
| Parameter | Specification Range |
|---|---|
| Silicon Content (Si) | 30% – 65% |
| Calcium Content (Ca) | 1% – 5% |
| Carbon Content (C) | ≤ 6% |
| Sulfur Content (S) | ≤ 0.10% |
| Phosphorus Content (P) | ≤ 0.05% |
| Size Options | 0–10 mm / 10–50 mm / Customized |
| Packaging | 1MT Jumbo Bags / As per request |
| Minimum Order Quantity (MOQ) | 20MT (1×20' Container) |
Service Highlights
The most important application of silicon slag is as a deoxidizer in steelmaking. During the steelmaking process, the silicon in the slag reacts with oxygen in molten steel, effectively removing impurities and improving steel purity, density, and mechanical properties. Compared to using expensive pure ferrosilicon, silicon slag significantly reduces production costs while delivering excellent cost-effectiveness. This is why it has been widely adopted by numerous steel mills around the world.
Silicon slag powder can be crushed, mixed, and compressed into briquettes or bricks. These formed products are easy to transport, store, and feed into furnaces, making them very popular in foundries and steel plants. Silicon briquettes not only offer convenience but also ensure uniform release of silicon during smelting, improving overall melting efficiency.
In cast iron production, silicon slag can be used as an inoculant. It helps refine grain structure and improve the microstructure of cast iron, thereby enhancing the strength, toughness, and wear resistance of castings. It serves as a cost-effective auxiliary material for improving cast iron quality.
Applications of Silicon slag
Silicon slag is a versatile industrial material with a wide range of applications across multiple sectors. Although it originates as a byproduct of silicon metal and ferrosilicon production, its considerable silicon content and low cost have made it a valuable resource in various industries.
The primary and most important application of silicon slag is as a deoxidizer in steelmaking. During the steelmaking process, the silicon in the slag reacts with oxygen dissolved in molten steel, effectively removing impurities and improving steel quality, density, and mechanical properties. Compared to using expensive pure ferrosilicon, silicon slag offers a cost-effective alternative that significantly lowers production costs while maintaining excellent deoxidation performance. For this reason, it is widely adopted by steel mills across the globe. In addition to steelmaking, silicon slag is also used in cast iron production as an inoculant, where it promotes grain refinement and improves the microstructure of castings, resulting in enhanced strength, toughness, and wear resistance.
Another common application is the production of silicon briquettes and bricks. Silicon slag powder can be crushed, mixed with binders, and compressed into these formed products, which are easy to handle, transport, store, and feed into furnaces. This makes them highly practical for steel plants and foundries, ensuring uniform silicon release during smelting and improving overall melting efficiency. Furthermore, silicon slag can be used as a raw material in the production of silicon-calcium-aluminum composite alloys, which function as efficient compound deoxidizers capable of simultaneously removing oxygen, sulfur, and other impurities from molten steel, making them particularly suitable for manufacturing high-grade specialty steels.
Why Partner With Us?
With over 20 years of experience in exporting ferroalloys, we are a trusted name in the global metallurgical industry. Our well-established supply chain allows us to serve clients with reliable quality, competitive pricing, and fast delivery.
Our Main Products Include:
Ferro Silicon (FeSi 72 / 75 / High Purity)
Manganese Alloys: Medium Carbon FeMn, Low Carbon FeMn
Ferro Chrome: Low Carbon FeCr
Silicon Metal: Standard Grade and Off Grade
Calcium Silicon, FeSiBa, FeSiMg, SiC
Graphite Petroleum Coke (GPC)
Cored Wire for Foundry and Steel Mills
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