The use of sea sand

Sea sand can be divided into construction, industry, ironmaking, etc. According to different special purposes, it can be divided into glass sand, casting sand, heat insulation sand and grinding sand.

Summer is coming, and the weather is very hot. We all like to go to the seaside with friends. The sand on the beach is fine and soft, so it is comfortable to step on. Maybe some people don't know what the sea sand is for. Let's have a look.

0 1 sea sand, as the name implies, is the sand in the sea. Sand with larger particle size is generally measured in centimeters; The smaller particle size is sand, usually in millimeters; Both of them are pure natural, washed, rolled, collided and polished by seawater. In addition to silica, sea sand also contains a small amount of chloride ions, feldspar, calcium, magnesium, mica and so on. As the second largest marine mineral after oil and natural gas, sea sand has many uses, among which one of the most important uses is as raw materials for engineering construction, especially for land reclamation in large-scale construction.

02 construction

More than 90% of the world's total sea sand production is used as building and civil materials for sand making machines, of which 45% is used as concrete fine bone materials. In addition, about 20% of sea sand is used for paving road foundation, about 20% is used as filler for land reclamation, and the remaining 65,438+05% is used for asphalt concrete.

In Taiwan Province Province, due to the lack of complete sea sand survey, utilization planning and related data specifications, the existing sea sand development plan is used for land reclamation except for some sea sand illegally exploited and dredged in harbor channels. Taking the developed Zhang Bin Industrial Zone as an example, when 1998 is completed, it is estimated that the required sea sand filling will exceed1600,000 tons. The Yunlin Island Basic Industrial Zone needs to be filled up to 600 million cubic meters. Land reclamation activities in other coastal areas have also started one after another, so the demand for sea sand will inevitably increase greatly.

03 industry

Industrial sea sand can be divided into silica sand, calcareous sand and heavy sand in composition. Although the output only accounts for about 10% of the total amount of sea sand, it is widely used.

Smelting iron

Iron-bearing sea sand obtained by magnetic separation. Used in ironmaking and steelmaking. For example, Indonesian sea sand.

04 glass sand

Glass sand is the main raw material for making glass, and its particle size specification can refer to the standards of American Ceramic Society, while its composition has different specifications according to the types of finished products. For the optical glass with the highest purity, the content of silica in silica sand must be greater than 99.8%, while the content of alumina and iron oxide must be less than 0. 1% and 0.02% respectively.

05 foundry sand

Used for steelmaking and casting alloys of copper, lead and iron. The required characteristics of silica sand include adhesion, heat insulation and permeability.

Insulating sand

Quartzite is often used as raw material for making silicon bricks and tiles.

Abrasive grinding

Mainly composed of quartz sand, it is used for stone sawing, glass polishing, metal polishing and sand blasting. Requirements include cleanliness, hardness, uniform particle size and edges and corners.