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Introduction to Magnesium
Magnesium is a metallic element with the symbol Mg and the atomic number 12. Magnesium is a silvery white, lightweight and ductile metal. Its density is 1.74g/cm³, melting point is 650℃, boiling point is 1090℃, and valence is +2.
Source and distribution of magnesium
Magnesium resources are abundant and widely distributed. In addition to the abundant reserves of solid magnesium-containing minerals, magnesium-containing evaporative minerals (seawater, brine, salt lakes) are inexhaustible. The current reserves of magnesium-containing resources can fully meet the human demand for magnesiu. Natural brine can be regarded as a recyclable resource, so the magnesium mined will be regeneration in a short time. Magnesium is one of the most abundant light metal elements on the earth. Magnesium-containing minerals mainly come from dolomite, magnesite, hydromagnesite and olivine. Seawater and natural salt lake water are also rich resources containing magnesium.
According to data released by the United States Geological Survey (USGS) in 2015, the world's proven magnesite resources amount to 12 billion tons, with reserves of 2.4 billion tons, of which China has 500 million tons, accounting for 21% of the total. China is one of the countries with the richest magnesium resources in the world, with a full range of magnesium resource ore types and a wide distribution, and ranks first in the world in terms of reserves and production.
The Advantages of Magnesium
Low density: The density of magnesium alloy is about 1.74 g/cm³, which is much lower than iron alloy and aluminum alloy, about 2/3 of aluminum and 1/4 of iron.
High strength-to-weight ratio: Despite the low density, the strength-to-weight ratio of magnesium alloy is very high, providing excellent mechanical properties.
Good thermal conductivity: The thermal conductivity of magnesium alloy is better than that of aluminum alloy and iron alloy, and is suitable for heat sinks and other thermal management applications.
Good electromagnetic shielding: Magnesium alloy can effectively shield electromagnetic interference and is suitable for electronic equipment.
Processing performance: Magnesium alloy is easy to process, including casting, extrusion, forging, etc., and is suitable for the manufacture of parts with complex shapes.
Recyclability: Magnesium alloy can be fully recycled and is environmentally friendly.
Various processing technologies
Casting: Magnesium alloys have good Processing performance and are suitable for pressure casting and gravity casting. They are used to manufacture automotive parts, 3C product housings, etc.
Extrusion and rolling: The cast magnesium alloy ingots are extruded and rolled to form semi-finished products such as plates, bars, and pipes.
Forging: Forging of magnesium alloys is suitable for producing high-strength parts such as automobile wheels, aircraft parts, etc.
Machining: Magnesium alloys are easy to cut and shape, and are suitable for CNC machining and other machining technologies.
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