2014年4月22日星期二

about Lithium Tungstate

Lithium tungstate is the inorganic compound with the formula Li2WO4, appears white solid that is soluble in water. The compound is one of the several other tungstates, compounds that feature the tetrahedral WO42- anion.

Lithium tungstate is used to produce high density water solutions. This use was developed in the early 1990s to address issues with existing high density fluids such as toxicity, safety, and stability, It can safely be used in an indoor environment without a fume hood with only ordinary common sense safety precautions such as protective gloves and safety glasses.

The salt consists of tetrahedral coordinated Li and W content bridged by oxides. The solid undergoes phase transitions at high pressures, such that the coordination geometry at tungsten becomes octahedral.

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Applications of Tungsten Disulfide


Tungsten Disulfide whose chemical formula is WS2, can be used in high temperature and high pressure applications. It offers temperature resistance from -270º C to 650º C in normal atmosphere and from -188º C to 1316º C in Vacuum. Load bearing ability of coated film is extremely high at 300,000 psi. WS2 can also be used instead of molybdenum disulfide-MoS2. 

 The WS2 powder could be mixed with wet lubricants:
The tungsten disulfide powder can be mixed 1wt% to 15wt% (as users required) with grease or oil. This will enhance lubricity of the mixture and also improves High Temperature and Extreme Pressure properties of mixture. During the use, tungsten disulfide in the mixture will get coated on mating/moving parts, which in turn reduces friction and improves lubricity and load bearing ability for much longer cycles.


The tungsten disulfide powder can be coated by spraying (at 120 psi) the substrate with dry & cool pneumatic air. It does not require any binders and spraying can be done at normal room temperature. Coated film will be 0.5 um thick. In an alternative application method,  tungsten disulfide powder could be mixed with Propyl alcohol and this paste could be buffed to the substrate. 

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Storage of Tungsten Powder

There are several requirements on storage of tungsten powder as following:
*Should be stored in shady, cool and ventilated warehouse.
 *Keep far away from fire, heat source and acid. 
*Smoking in the workplace is absolutely prohibit. 
*Should be available fire fighting equipment such as extinguisher 
*Stored in vacuum encapsulation in case of being oxidized.

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2014年4月15日星期二

New Opened Tungsten Mine in UK

As reported, tungsten mine in UK opened recently. Exact information as following:
"The £123 million Hemerdon project, near Plymouth, Devon, is reportedly the third largest tungsten resource in the world.
When complete the mine will feature an 850m x 450 m open cast pit extending to a depth of 200 m, together with a processing plant and integrated mine waste facility. 
Production is expected to start in 2015 and is scheduled to produce 3,450 tonnes of tungsten concentrate annually – equivalent to approximately 3.5% of global forecast demand – providing security of supply for tungsten and valuable export revenue for the UK, according to Wolf Minerals."

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