International silver price trend chart silver price

The trend chart of international silver price shows a downward trend, but it has recently shown an upward trend, from 22.523 yesterday to 22.525 today.

Silver, namely silver, is called silver because of its white color, as opposed to gold. Think of it as money and decorations. In ancient times, money was called silver. Pure silver is white in color, metallic in luster with impurities, soft in quality, hardened with impurities, and grayish red in color. Pure silver has a specific gravity of 10.5, a melting point of 960.5℃, good conductivity, and is soluble in nitric acid and sulfuric acid. Silver is one of the metals found in ancient times. Although silver also exists in the form of simple substance in nature, most of it exists in the form of combined state. Silver has high ductility, so it can be rolled into a transparent foil with a thickness of only 0.3 microns, and silver particles with a weight of 1 g can be drawn into filaments about two kilometers long. The thermal conductivity and electrical conductivity of silver are among the best among metals.

Industrial application

1, electronic appliances

Electronic appliances are the industry with the largest amount of silver, and their uses are divided into electrical contact materials, composite materials and welding materials. Silver and silver-based electrical contact materials can be divided into pure silver, silver alloy, silver oxide and sintered alloy. The annual output of silver and silver-based electrical contact materials in the world is about 2900~3000t, and composite materials are prepared by composite technology, which can be divided into silver alloy composite materials and silver-based composite materials. From the point of view of silver saving technology, silver composite material is a new material with great development prospect. Silver welding materials such as pure silver solder and silver copper solder.

2. Photosensitive materials

Silver halide photosensitive material is one of the fields with the largest amount of silver. At present, several photosensitive materials with the largest production and sales volume are photographic film, photographic paper, X-ray film, fluorescent information recording film, electron microscope photographic film and printing film. In 1990s, the world photographic industry used about 6000 ~ 6500 tons of silver. Due to the development of electronic imaging and digital imaging technology, the amount of silver halide photosensitive materials has decreased, but the application of silver halide photosensitive materials is still irreplaceable in some aspects, and there is still a great market space.

3. Chemistry and chemical engineering

Silver has two main uses in this respect. One kind is silver catalyst, which is widely used in redox and polymerization reactions, and is used to treat industrial waste gas containing sulfide. Second, industrial preparations for electronic plating, such as silver paste and silver potassium cyanide.