What is the price of silicon metal 3303?
| Today's international industrial silicon price | ||||||
| Brand | price | Rise and fall | unit | Origin | Remark | |
| Japan | 553 | 1320-1350 | -- | US dollars/ton | China | CIFYokohama |
| 441 | 1370-1420 | -- | US dollars/ton | China | CIFYokohama | |
| South Korea | 553 | 1320-1350 | -- | US dollars/ton | China | CIFBusan |
| 441 | 1370-1420 | -- | US dollars/ton | China | CIFBusan | |
| India | 553 | 1320-1350 | -- | US dollars/ton | China | CIF-Nhava Sheva |
| 441 | 1370-1420 | -- | US dollars/ton | China | CIF-Nhava Sheva | |
| USA | 98.50% | 1.45-1.6 | -- | USD/lb | DDP | |
| Europe | 98.50% | 2200-2250 | -- | Euro/ton | DDP | |
| 99% | 2300-2350 | -- | Euro/ton | DDP | ||
What is the price of silicon 3303?
| China's export price of industrial silicon on September 2 | |||
| Brand | Tax-inclusive quote | Rise and fall | Remarks (USD/ton) |
| 421 | 1470-1520 | -- | Huangpu Port, FOB |
| 2202 | 2100-2200 | -- | Huangpu Port, FOB |
| 3303 | 1500-1530 | -- | Huangpu Port, FOB |
| 441 | 1350-1400 | -- | Huangpu Port, FOB |
| 553 | 1310-1330 | -- | Huangpu Port, FOB |
What is the silicon metal used for?
Silicon metal is a critical raw material for several major industries. Its primary use is as an alloying agent, but its most high-value application is in technology.
1. Aluminum Alloys (Largest Application):
Approximately 60% of silicon metal is used to make aluminum-silicon (Al-Si) alloys. Adding silicon to aluminum:
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Improves castability by making the molten metal more fluid.
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Increases strength and hardness.
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Reduces weight and improves corrosion resistance.
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Applications: Automotive engine blocks, cylinder heads, wheels, and various aerospace components.
2. Chemical Industry (Silicones):
This is the second-largest use. Silicon metal is the fundamental raw material for producing silicones.
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Silicon metal is reacted with methyl chloride to form chlorosilanes, which are then processed into a vast array of silicone products.
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Silicone Applications: Sealants, adhesives, lubricants, plastics, cosmetics (shampoo, makeup), medical implants, and baking trays. This category is incredibly diverse.
3. Electronics: Solar Panels and Semiconductors (High-Purity Grade):
A smaller volume but extremely high-value application is in electronics. This requires ultra-pure silicon (99.9999999% or "9N" purity), which is further processed from metallurgical-grade silicon.
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Solar Photovoltaics (~95% of electronics use): The majority of ultra-pure silicon is used to manufacture polysilicon for solar cells.
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Semiconductors: Used to make silicon wafers, which are the foundation for computer chips, transistors, and all other integrated circuits that power modern electronics.
4. Other Uses:
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Production of fumed silica (used as a thickening agent in paints, coatings, and toothpaste).
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As a base material for producing other high-purity silicon compounds.
How is silicon metal produced?
Silicon metal is produced industrially by the carbothermic reduction of silica (SiO₂) in a Submerged Arc Furnace (SAF). This is an energy-intensive process that requires extremely high temperatures.
Raw Materials:
1.
Quartzite or High-Purity Silica Sand (SiO₂): The source of silicon.
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Carbon Reducing Agents: Typically a mix of coal, coke, and wood chips. The carbon reacts with the oxygen in the silica.
3.
Electrodes: Large carbon electrodes that supply the immense electrical energy needed.
The Process Step-by-Step:
1.
Charging the Furnace: The raw materials (quartz and carbon) are carefully weighed and mixed before being continuously fed into the top of the submerged arc furnace.
2.
Smelting (The Key Reaction):
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The furnace operates at temperatures around 1900°C (3450°F).
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The intense heat is generated by an electric arc between the electrodes at the bottom of the furnace.
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The carbon reduces the silicon dioxide (silica) to silicon metal. The overall simplified chemical reaction is:
SiO₂ (solid) + 2C (solid) → Si (liquid) + 2CO (gas)
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The wood chips are crucial as they create a porous mixture, allowing the harmful carbon monoxide (CO) gas to escape easily.
3.
Tapping:
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The molten silicon metal, which is denser, accumulates at the bottom of the furnace.
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Impurities form a less dense slag that floats on top.
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The molten silicon is tapped (drained) from the furnace into large ladles at regular intervals.
4.
Refining and Casting:
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The molten metal may be treated with oxygen or air to reduce the calcium and aluminum impurity content further.
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It is then poured into shallow troughs or molds to cool and solidify into large, brittle blocks called "pigs."
5.
Crushing and Sizing:
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Once cooled, the silicon metal pigs are crushed, sized, and graded according to chemical composition and particle size for shipment to customers in different industries.
Upgrading to Electronic Grade:
The silicon metal produced by this method is "metallurgical grade" (~99% pure). To achieve the ultra-purity needed for solar panels and semiconductors, it undergoes additional complex purification processes, most commonly the Siemens process, which converts it to trichlorosilane gas and then deposits it as ultra-pure polysilicon.
What is the price of silicon metal powder?
| China's industrial silicon powder prices on September 2 | ||||
| Note: RMB/ton, polysilicon purchase and delivery price | ||||
| Specification | Quote | Rise and fall | Sold Price | Rise and fall |
| 553 (16-200 mesh) | 9500-10400 | -- | 9300-10300 | -- |
| Si≥99% (16-200 mesh) | 9800-10400 | -- | 9400-10300 | -- |
Silicon metal powder is exactly what it sounds like: silicon metal that has been ground, milled, or atomized into a fine powder. The particle size can range from coarse granules to ultrafine, sub-micron powders, depending on the intended application.
Its uses are distinct from bulk silicon metal and are driven by the advantages of a high-surface-area powder form, such as faster reaction rates, easier mixing, and use in composite materials.
What Is Silicon Metal Powder Used For?
The applications are diverse and span several high-tech industries:
1. Pyrotechnics and Explosives:
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Primary Use: This is a traditional and significant application.
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Function: Silicon powder is highly reactive. When mixed with an oxidizer, it creates a very bright white flash and a loud report (bang). It is a key component in fireworks (for flash effects), incendiary devices, and some military flares.
2. Chemical Industry (Silicones and Silanes):
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Primary Use: Feedstock for chemical synthesis.
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Function: The high surface area of the powder allows it to react more efficiently with methyl chloride or other chemicals in large reactors to produce chlorosilanes. These are the essential building blocks for the entire silicone industry (sealants, lubricants, resins) and for creating silane gas (SiH₄), used in electronics.
3. Metallurgy:
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Alloying: Powder can be added to molten aluminum or other metals for precise alloying, though lump metal is more common for bulk production.
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Metal Matrix Composites (MMCs): Silicon powder is mixed with aluminum or other metal powders and then processed (e.g., through Hot Isostatic Pressing - HIP) to create composite materials. These composites have improved stiffness, wear resistance, and reduced thermal expansion, making them valuable for aerospace and automotive parts.
4. Electronics and Photovoltaics:
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Solar Cell Production: Ultra-high-purity silicon powder can be used in certain processes to produce the polysilicon for solar panels.
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Semiconductor Precursors: It is a raw material for producing high-purity silane and other specialty gases essential for semiconductor manufacturing.
5. Refractories and Ceramics:
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Function: Added to alumina-carbon or magnesia-carbon refractories (linings for high-temperature furnaces, like in steelmaking). During use, the silicon powder reacts with carbon and nitrogen to form silicon carbide (SiC) or silicon nitride (Si₃N₄) bonds within the refractory, significantly enhancing its strength, thermal shock resistance, and corrosion resistance.
6. Other Applications:
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Anode Material for Lithium-Ion Batteries: Nanoscale silicon powder is a subject of intense research and beginning use. Silicon can store significantly more lithium than the graphite used in traditional anodes, potentially dramatically increasing battery capacity. The challenge is managing silicon's large volume expansion during charging.
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Construction: Used in some specialty concrete and mortars for improved density and properties.
How To Use Si Metal Powder? (Handling And Processing)
Using silicon metal powder requires careful handling due to its reactivity, especially as a fine dust.
1. Safety First: Critical Precautions
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Explosion Hazard: Fine metal powder dispersed in air can form a highly explosive mixture. Dust explosion is the single biggest hazard.
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Required Measures: Use equipment and facilities designed for hazardous dust (explosion-proof motors, dust collection systems, proper grounding). Avoid creating dust clouds.
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Fire Hazard: Silicon powder is flammable. It can ignite spontaneously in air if very fine.
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Health Hazard: Inhaling fine dust can cause respiratory irritation or long-term lung damage (silicosis).
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Required PPE: Wear appropriate respiratory protection (NIOSH-rated dust mask or respirator), safety goggles, and gloves.
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Reactivity: Reacts with strong oxidizers, strong acids, and strong alkalis. It must be stored in a cool, dry, well-ventilated area away from such materials.
2. Common Processing and Use Methods:
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Mixing and Blending: This is the most common step. Silicon powder is often dry-mixed with other powders (e.g., oxidizers for pyrotechnics, carbon for refractories, metal powders for MMCs) in a blender. This must be done under controlled conditions to prevent static discharge and dust generation.
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Compaction and Sintering: For making refractory bricks or metal matrix composites, the powder blend is pressed into a "green" shape under high pressure and then heated (sintered) in a controlled atmosphere furnace. The heat causes the particles to fuse together without melting completely, creating a solid, strong part.
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Chemical Reaction: In chemical production, the powder is fed into large reaction vessels where it reacts with gases or liquids under controlled temperature and pressure.
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Adding to Molten Metal: For metallurgical alloying, the powder can be injected into a molten metal bath or added to a crucible. The high surface area allows for rapid dissolution and reaction.
In summary, silicon metal powder is a versatile material whose value comes from its high reactivity and ability to be uniformly blended. Its use is dictated by its particle size and purity and always requires strict safety protocols to manage its significant fire and explosion risks.
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