Overview
Metallic silicon, produced through carbothermic reduction of quartz, is a fundamental industrial material with 98-99.99% purity. The global market is driven by demand from aluminum alloy producers (55% of consumption) and growing solar/photovoltaic applications. China dominates production with 80% global output, followed by Brazil and Norway. Grades are classified by impurity content (Fe, Al, Ca), with 553 (5% Fe, 5% Al, 3% Ca) being the most traded. Recent technological advancements enable production of 6N purity (99.9999%) for semiconductor applications, though this represents less than 5% of total output.
Physical and Chemical Properties
As a Group 14 metalloid, silicon exhibits both metallic and non-metallic characteristics. Its diamond cubic crystal structure provides exceptional thermal stability (up to 1414°C melting point), making it ideal for high-temperature applications. The material's 1.1eV bandgap enables semiconductor functionality when doped. Notably, silicon forms a protective oxide layer when exposed to air, enhancing corrosion resistance. However, it reacts vigorously with halogens (especially fluorine) and strong alkalis. Particle size distribution (typically 0-10mm for metallurgical grade) significantly affects reactivity and alloying performance.
Main Applications
In aluminum foundries (70% of usage), silicon improves fluidity and reduces shrinkage during casting, with typical addition rates of 7-12%. The chemical industry consumes 20% for silicone production through the Müller-Rochow process, where silicon reacts with methyl chloride. The electronics sector requires ultra-high purity (9N-11N) for wafer manufacturing. Emerging applications include silicon-based battery anodes (15-20% capacity improvement over graphite) and solar panel backsheets. Recent market analysis projects 6.8% CAGR through 2030, driven by renewable energy investments.
Safety and Storage
Silicon dust (particles <10μm) poses inhalation hazards (TLV 10mg/m³), requiring N95 masks or supplied-air systems in processing areas. Bulk storage should maintain <40% relative humidity to prevent surface oxidation and hydrogen generation when wet. DOT classifies metallic silicon as a Class 4.3 dangerous good (water-reactive). Firefighting requires Class D extinguishers; water application causes explosive hydrogen formation. Containers should bear UN1385 markings for international transport, with standard 1MT big bags being the most common shipping format.
B2B Procurement Guide
Major producers include Ferroglobe, RIMA Group, and Hoshine Silicon. Spot prices fluctuate with electricity costs (14-16kWh/kg production energy) and Chinese export policies. Contract buyers typically secure 3-12 month fixed-price agreements with ±5% volume flexibility. Technical specifications should address: 1) Purity (98%, 99%, or 99.99%), 2) Particle size distribution (0-3mm, 3-10mm, or customized), 3) Packaging (1000kg jumbo bags with PE liner standard), and 4) Trace element analysis (critical for semiconductor applications). Third-party inspection (SGS/BV) is recommended for shipments exceeding 20MT.
Related Manufacturers
- 主营：高岭土、铝矾土、高铝粉、金属硅、炉衬料、石英砂、石英粉、长石粉、高铝砂、玻璃粉、电熔镁砂、锆英砂、金刚砂、矿渣粉、重晶石粉、彩砂、重金石、钙粉
- 主营：人造沙滩、天然彩砂、烧结彩砂、金属硅颗粒、环氧地坪砂、沙画用烧结沙、染色彩砂真石漆
- 主营：蛭石、椰糠、稻壳碳、硅藻土、金刚砂、玻璃粉、麦饭石、火山石、重晶石、高岭土、白炭黑、玻璃砂、贝壳粉、氧化铁、重钙、沸石
- 主营：金属硅、金属硅粉
- 主营：云母粉 云母碎、铁粉 铁砂 铁矿石、蛭石颗粒、硅藻土、硅灰、水洗煅烧高岭土、钙基 钠基膨润土、石英沙石英粉、滑石粉、碳酸钙、沸石 沸石粉、火山石、活性白土、灰钙 氢氧化钙、五彩石、赤铁粉、氧化钙、仿瓷沙、钾钠长石粉、方解石粉
- 主营：硅藻土、云母、烧烤炭、火山石
- 主营：云母、高岭土、氧化铁颜料、硅藻土、火山石、绿沸石、陶瓷砂、麦饭石陶瓷球、海泡石、石墨、碳化稻壳、贝壳粉、玻璃砂玻璃砂、松树皮有机覆盖物、蛭石、椰糠椰壳砖营养土、仿瓷颗粒砂、莫来砂、复合岩片贝壳彩片、电气石、活性白土
- 主营：蛭石、云母、重晶石、金属硅厂家、彩色木屑、白炭黑、金刚砂、铜矿砂、氧化铁、玻璃微珠、发酵松树皮、麦饭石、绿沸石、贝壳粉、高岭土、膨润土、海泡石、滑石粉、陶瓷砂、玻璃砂
- 主营：碳化硅、硅碳合金、碳化硅废料回收
- 主营：玻璃粉、白炭黑、膨润土、二氧化硅、抗油墨、白色塑料、造纸造香、吸附助滤、油漆涂料、宠物垫料、发酵树皮、橡胶塑料、皮坛造景、园林景观、钢厂保温、育苗基质、树脂增稠、绢云母粉、染色树皮、无机颜料、油墨涂料、减重填充剂、木质纤维素、蒙脱土陶瓷、中华麦饭石
- 主营：玻璃粉、沸石粉、氧化铁红、硅藻土、麦饭石粉
- 主营：配重铁砂、还原铁粉、白炭黑、二氧化硅、煅烧硅藻土、微硅粉、碳化稻壳、玻璃微珠、贝壳粉、石英粉、石英沙、麦饭石球、麦饭石颗粒、火山石、氧化钙、氢氧化钙、蛭石、云母粉、膨润土、高岭土、氧化铁红、绿沸石粉、萤石粉、重质碳酸钙、重晶石粉
- 主营：蛭石粉、沸石粉、麦饭石粉、硅藻土、保温涂料、防火涂料、彩色树皮、耐火材料、珍珠岩粉、树皮、彩色玻璃珠、生物质颗粒、纳米陶瓷仿瓷砂、兰花栽培基质、白炭黑、钙粉、重晶石、滑石粉、金刚砂、氧化铁、膨润土、椰糠、高岭土
- 主营：高岭土、膨润土、云母、硅灰粉、硅藻土、滑石粉、重晶石、碳酸钙、白炭黑、玻璃粉、金刚砂、蛭石、彩色树皮、喜马拉雅盐、陶瓷砂、麦饭石
- 主营：金属硅、钼铁、钒铁、锰铁