As we all know, gold is a very valuable precious metal, worth 385 yuan per gram, and most of it is put into the national treasury by the national government for good preservation. Most types are gold. Gold pieces are of course used to make valuable items. Objects made of gold are usually jewelry, currency, and currency, such as rings, necklaces, gold coins (in ancient times), gold bricks, gold bars, etc. There are also objects used to make celestial spheres.
Silver is silvery white and is also a precious metal. In ancient China, it was used to make silver ingots or broken silver for state expenditures and daily transactions; the ancient Egyptians used to use the water-soluble silver ion sterilization effect of silver to make silver flakes to treat wounds. Modern silver is also commonly used in jewelry processing. Silver has excellent electrical conductivity and heat transfer performance. Common industrial silver pieces are generally parts of electronic instruments and power generation equipment, such as silver core wires.
3. Copper parts
Copper is the messenger of human civilization. Ancient people used copper to make ritual vessels, such as copper tripods and modern tools. As we all know, copper has excellent electrical conductivity, second only to silver, but copper ore is more expensive and cheaper than silver ore. Copper is often used to make wire cores and some parts of communication equipment and electronic equipment.
4. Iron parts
The application range of iron is very wide, and the content in the world is also very large: the world’s proven iron ore reserves have exceeded more than 200 billion tons! There are two types of commonly used iron: hematite and magnetite.
The composition of hematite is iron trioxide, which is dark red or steel gray. Cast iron nails, screws, nuts, hammer heads, machine parts, etc. are mostly used.
Magnetite is magnetic, also known as “magnetite” or “magnet”. The application range of magnetite is not as wide as hematite, but it is also useful. Magnetite can be shaped into a magnet to identify objects.
5. Tin parts
The application range of tin is not very wide. Common tin parts include canned bottle caps, tin foil, and plastic bottle tin seals.