Diantimony Trioxide CAS 1309-64-4

Antimony trioxide is derived from antimony, which is a silver-white, lustrous, hard and brittle metal (often made into rods, blocks, powders and other shapes). Has a scaly crystal structure. Gradually lose its luster in humid air, and burn into white antimony oxide when heated. Antimony has a wide range of uses and meets the four recognized conditions of strategic metals. It is a “fire-fighting hero” and a “metal hardener”. Antimony is indispensable in the fields of flame retardants, fuels, automobile batteries, semiconductors, etc., and the European Commission is listed as ” It is the first of 14 “suffering materials” that are critical to the EU’s life and death.

China is the country with the most abundant antimony ore resources in the world. In 2010, according to the report of the US Geological Survey, China’s antimony production accounted for 88.9% of the world’s total. The output is about 120,000 tons, but like many rare metals, we have no pricing power in the international market.

• Tin mines do not produce tin
  The tin mining area was discovered at the end of the Ming Dynasty (1541). At that time, the antimony was mistaken for tin, so it was called “tin mine”, but it was abandoned because the tin could not be smelted (the world’s largest antimony mine was abandoned, and the baby was shocked to death) ). Until the Guangxu period of the Qing Dynasty, the antimony ore in the tin mine was officially mined. It is famous for its rich antimony resources, excellent quality and large output, and is known as “the world’s antimony capital”.

  The title of “World Antimony Capital” was later moved to Lengshuijiang City, which was established because of the mines. It is a pity that in that semi-colonial period, good things had to be given to foreigners first, and imperialist countries such as Britain, the United States, Germany, and Japan carried out predatory mining, which made the mining area full of holes.

• Antimony coins
  In addition to the people who do coin collecting, almost no one else knows that there is such a story. During the National Revolutionary War, inflation was everywhere. In order to curb local prices in Guizhou, the Guizhou provincial government issued “ten antimony coins” in 1933. Throughout the ages, coins are mostly made of gold, silver, nickel, copper, iron, lead, and antimony. As a coin material, this is unique in the history of coinage in China and even in the world.

  Among the various coins known to be issued in my country, “Guizhou Dangshi Antimony Coin” has become a treasure among coins due to its special coin material, small amount of minting, narrow circulation, and rarity in the world (if you can have a bag, maybe it can be found in The imperial capital has changed houses). Why did antimony coins disappear later? The main reason is that pure antimony cannot be used to make hard objects, because antimony is easy to wear, which leads to serious losses in the circulation process, and an antimony coin often gets smaller and smaller.

The production process of antimony trioxide can be divided into dry method and wet method. Dry method, also known as fire method, is a type of production method that is widely used at present. Dry production of antimony trioxide mainly includes metal antimony fume method (also known as indirect method) and concentrate double kiln fume method (also known as direct method). Antimony trioxide prepared by dry method is mainly cubic, and also contains a certain amount of orthorhombic crystals.

The metal antimony fume method (also known as the crucible fume method) uses pure metal antimony as the raw material. The metal antimony is heated and melted in the generator. After melting, when the temperature reaches the requirement, the heating is stopped, and air is blown into the antimony liquid at high temperature to oxidize and volatilize pure antimony trioxide vapor, and rapidly cool to form fine-grained antimony trioxide powder. The double kiln fuming method of concentrate, the double kiln fuming method of concentrate is to use antimony concentrate as raw material. The antimony concentrate is loaded in the first rotary kiln, and it is oxidized and volatilized at high temperature to generate coarse antimony trioxide powder. In the second rotary kiln, volatilization and oxidation are carried out with high flow to form steam, which is collected by rapid cooling to obtain pure antimony trioxide powder. The method has mature production technology and does not require metal antimony as raw material. The main disadvantage is that there is no refining and impurity removal process in the process, so the chemical purity of the product is slightly worse than that of the metal antimony fume method.

Wet production process The wet production of antimony trioxide can process not only single antimony-containing raw materials, but also complex multi-metal ores, such as antimony gold ore, antimony lead ore, antimony mercury ore, mixed sulfide-monoxide ore and copper , Anode slime in lead refining process, antimony-containing soot from smelters, etc. The wet production process is mainly composed of two processes of antimony leaching and electrowinning. The former is to dissolve antimony in a solvent, and the latter is to electrolyze the resulting solution to produce metal antimony.