APT is a white crystallized powder having average crystal size between 30 and 100 µm. especially crucial for the quality is the purity. APT is the main intermediate and also the main tungsten raw material traded in the market. APT is packaged in polyethylene-lined drums or woven bags up to 1 ton.
Planet One Group
Tungsten does not occur in its pure metallic form in nature, but only as a constituent of a wide range of minerals. Of those, two minerals scheelite and wolframite are of economic importance as they can form economic viable deposits.
Tungsten APT (Ammonium Paratungstate)
APT is the base of all other intermediates products such as tungsten trioxide, tungsten blue oxide, tungstic acid and ammonium metatungstate, they are all derived from APT, either by thermal decomposition or chemical conversion.
The name ‘tungsten’ comes from the Swedish words ‘tung sten’ meaning ‘heavy stone’ in reference to the mineral scheelite. Tungsten’s chemical symbol W comes from the German name Wolfram. Wolframite and scheelite are the two naturally occurring tungsten ores important for industrial use. In its raw form tungsten is a hard steel-grey metal that is often brittle and hard to work, pure tungsten metal is shiny white and quite pliant. Its hardness in carbide form is second only to that of diamond and it has the highest melting point (at 3410°C) of all metallic elements.
The main use of tungsten is the manufacture of cemented carbides or hard metals; wear resistant materials used in metalworking, mining, oil and construction industries. It has diverse commercial, industrial and military applications including hardening steels, use in the manufacture of armaments, lighting (light bulb filaments), electronic and chemical industries. Another of its numerous applications includes the technology market where it is used in the touch screens of smartphone devices.
Depending on the exact mineralogical properties of the ore including any valuable by-products or unwanted contaminants, various methods can be combined to produce a concentrate. The tungsten concentrate is then processed to Ammonium Paratungstate (APT) as the intermediate material for the various tungsten uses.