Tungsten [W]

A greyish metal having a density of 19.3 g/cc and melting point of 3410 ^degC. These two properties alone make it one of the most important metals in use across a very wide range of service applications. It imparts toughness to special steels, has excellent high temperature strength making it useful in super-alloys, riveting heads, contact breakers and electrical filaments. Its high density provides weight in counter-balancing, ballast, projectiles and ionising radiation shielding. Its exceptionally high melting point is applied to welding, plasma and EDM electrodes. Tungsten also has a very low coefficient of thermal expansion which is made use of in semi-conductor heat sinks.

Compounds of tungsten possess many other unique properties that are used in cutting tools e.g. tungsten carbide (WC), catalysis, pigments and lubricants.

A & M Minerals offers tungsten powders and alloys thereof to various specifications. For further information refer to the following link:

Tungsten and Cobalt Powders

Wolframite [(Fe,Mn)WO₄]

One of the principle minerals of tungsten of which the ore concentrate is generally to the following composition:

• WO₃ - >65%
• As - 0.2 - 1.0%
• Ca - <1.0%
• P - <1.0%
• S - <0.7%
• SiO2 - <7.0%
• Sn - 0.2 - 1.0%
• Mo - <0.4%
• Cu - 0.08 - 0.4%

Scheelite [CaWO₄]

Another of the principle tungsten minerals that is also traded in ore concentrate form and container loads. Prices are quoted in USD/mtu WO3 content, with variations in detailed specifications and logistics controlling the final price and terms of supply.

Ammonium Paratungstate [(NH₄)₁₀ (W₁₂O₄₁) .5H₂O]

Also commonly termed APT, it is the "mother salt" or fundamental intermediate for downstream manufacturing of most tungsten materials and is used in tungsten-bearing catalysts. APT is quoted on the LME where its price is used as the precursor for the tungsten market.

Ammonium paratungstate is a white crystalline powder having a minimum WO₃ content of 88.5%, it is traded in container loads and priced in USD/mtu WO₃. Its composition is typically:

• WO₃ - =88.5%
• Mo - <0.002%
• Others - <0.001%

Ammonium Metatungstate [(NH₄)₆ (H₂W₁₂O₄₀) .xH₂O]

Also commonly termed AMT. It is has higher water-solubility than APT which suits its predominant application in tungsten-bearing catalysts. It is also a white crystalline powder of up to 99.95% purity AMT.

Two grades are used in the industry having WO₃ contents of minimum 83% and 90%.

AMT is generally priced in USD/mt of material based on its WO₃ content.

Tungstun Trioxide[WO₃] Tungstun Oxide [WO₃-x]

Both oxides are primarily used for the production of tungsten powder. WO₃ is a yellow powder and often referred to as YTO, whereas WO₃-x is blue and known as BTO and TBO.

Purity is typically 99.95% and it is traded in drums and big bags (WO₃).

Pricing is in USD/mtu.

Tungstic Acid [H₂WO₄] or [WO₃.H₂O]

This is a light yellow powder which is used to make fine tungsten powders and glazes. Tungsten-bearing catalysts are also made using tungstic acid.

WO₃ content can be minimum 91% and it is traded in drums in USD/mt of material based on the WO₃ concentration.

Sodium Tungstate[Na₂WO₄]

This is a white crystalline powder used in a variety applications such as tungsten intermediates, tungsten-bearing catalysts, mordents, water treatment and fire proofing fabric.

Sodium tungstate is minimum 68% WO₃, available up to 98.5% purity and traded in USD/mt based on its WO₃.

Tungsten (other products)

A & M Minerals can also supply:

• Tungsten billets and bars.
• Tungsten carbide (solids and powder).
• Tungsten scrap, sludges and slimes.