Factory Direct Supply Cheap Silicon Slag

Silicon slag is a by-product of smelting metal silicon and ferrosilicon.It is a kind of scum floating on the furnace in the process of smelting silicon.It's content is from 45% to 70%,and the rest are C,S,P,Al,Fe,Ca. It is much cheaper than purity silicon metal.

Silicon slag is used for steel slag refining pig iron, ordinary casting, etc. The silicon slag can improve the furnace temperature and increase the flow of molten iron. Performance, effective slag removal, increase markings, improve the toughness and cutting ability of castings.

Packaging Options:

• 1MT Jumbo Bags with liner
• 25kg bags on pallets
• Customized packaging on request

Sizes Available:

• Lump: 10–100 mm
• Granule: 1–10 mm
• Powder: -200 mesh

Deoxidizer in steelmaking

The most important application of silicon slag is in the steel industry. It is widely used as a low-cost deoxidizer. When added to molten steel, silicon removes excess oxygen, which helps prevent porosity and improves the overall quality of the steel.

Alloying agent

Silicon slag also serves as an alloying agent. It adds silicon content to steel, which enhances the steel's strength, hardness, and magnetic properties. This is particularly important in producing silicon steel for electrical transformers and motors.

Slag conditioner and desulfurizer

In electric arc furnaces, silicon slag helps adjust the basicity of the furnace slag. This promotes the removal of sulfur and other impurities from the molten metal, leading to cleaner and higher-grade steel.

Temperature stabilizer

Adding silicon slag can also help stabilize the temperature inside the furnace. This improves energy efficiency and supports a more consistent melting process.

Other industrial uses

Beyond steelmaking, silicon slag has several other applications. It is used in cast iron production as an inoculant to refine grain structure. It can also be ground into powder and used as a pozzolanic additive in cement manufacturing, which improves strength and durability while reducing costs. In some cases, crushed silicon slag is used as a low-grade abrasive for sandblasting.

• Cost-effectiveness

The most significant advantage of silicon slag is its low cost. It is typically priced at only 30–50% of pure silicon metal. This makes it an attractive option for steelmakers who want to reduce production costs without completely sacrificing performance.

• Effective deoxidation

Silicon slag performs well as a deoxidizer in steelmaking. The silicon content effectively removes oxygen from molten steel, preventing porosity and improving the overall quality of the final product. For most standard steel grades, it delivers results comparable to more expensive alternatives.

• Dual function: deoxidizer and alloying agent

Unlike many other additives, silicon slag serves two purposes at once. It not only removes oxygen but also adds silicon to the steel. This improves the steel's strength, hardness, and magnetic properties-making it especially valuable for producing electrical steel and other specialty grades.

• Improves furnace efficiency

When added to the electric arc furnace, silicon slag helps condition the slag layer. This promotes better removal of sulfur and other impurities. It also helps stabilize furnace temperature, which improves energy efficiency and reduces overall melting time.

• Wide availability and stable supply

Because silicon slag is a byproduct of silicon metal production, it is consistently available in large quantities. There is no risk of supply shortages, and lead times are typically short. This gives buyers confidence in securing material when they need it.

• Flexible product forms

Silicon slag can be processed into various forms to meet different customer needs. It is available as lumps for direct furnace charging, granules for faster dissolution, powder for cement or refractory applications, and briquettes for clean, dust-free handling. This flexibility makes it suitable for a wide range of operations.

• Ease of handling and storage

Compared to pure silicon metal, silicon slag is more stable and less reactive. It does not require special storage conditions and can be kept outdoors or in standard warehouses. This reduces handling costs and simplifies inventory management for buyers.

• Proven track record

Silicon slag has been used in steel mills worldwide for decades. Its performance is well-documented and trusted by metallurgists. There is no need for extensive trial runs-customers can integrate it into their existing processes with minimal adjustments.

• Environmentally friendly

Using silicon slag is a form of recycling. Instead of discarding this byproduct, it is put to productive use in steelmaking and other industries. This reduces waste and supports more sustainable manufacturing practices.

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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