Sticky sand with a chemical composition of at least 99.1% silicon (Si), and maximum levels of 0.4% iron (Fe), 0.1% calcium (Ca), and 0.4% aluminium (Al), is a highly refined form of silica sand. The term “sticky” in this context typically refers to the sand’s cohesive properties, meaning it has a natural tendency to clump together, especially when moisture or binders are present. This property makes it particularly useful in specialized industrial applications.
The high silicon content indicates that the primary component of this sand is silicon dioxide (SiO₂), commonly known as quartz. Such high-purity silica sand is highly sought in industries that demand minimal contamination by other minerals or metals. The low levels of iron, calcium, and aluminium further suggest that this sand has undergone extensive purification, making it suitable for high-tech applications.
One of the most important uses of this type of sticky sand is in the glass manufacturing industry. High-purity silica is a critical ingredient in producing clear glass, optical glass, and laboratory glassware, where any impurities could compromise strength, clarity, or chemical resistance. The near-absence of iron is especially important in glass production, as iron can give glass an unwanted green tint.
Another significant use is in the foundry industry, where sticky sand is utilised to create moulds for metal casting. The cohesive nature of the sand allows it to hold detailed shapes and withstand high temperatures during the casting process. Often, binders such as bentonite clay are added to improve their stickiness and moldability.
In the electronics and solar industries, high-purity silica is a precursor material for producing silicon wafers used in semiconductors and photovoltaic cells. The strict purity standards in these industries make this type of sand ideal for silicon metal production through carbothermic reduction in electric arc furnaces.
Additionally, sticky sand may be used in construction materials, especially in applications that benefit from its fine grain and binding qualities, such as certain cements or speciality mortars.
Overall, sticky sand with this chemical profile is a versatile and valuable material, essential in multiple high-precision and high-performance sectors. Its combination of purity and physical cohesiveness defines its utility and makes it a critical raw material in many modern technological applications.
Sticky sand with high silica content is used in glass manufacturing, metal casting moulds, and semiconductor production. Its purity and cohesive properties make it ideal for producing clear glass, precision castings, and silicon wafers in electronics and solar panels, ensuring strength, detail, and minimal contamination in finished products.
| Si | Fe | Ca | AL |
|---|---|---|---|
| 99.1% min | 0.4% max | 0.1% max | 0.4% max |
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