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Evaporation crystallization method is the most important production method to prepare APT (ammonium paratungstate) at present, because it is no need to add extra agent, and will not introduce new impurity, besides, the crystallization process can further remove impurity to ensure the quality of products. More details, please visit: http://ammonium-paratungstate.com/index.html Preparation of Ammonium Paratungstate by Evaporation Crystallization Method At a constant temperature of 80 °C, use an evaporation crystallizer to heat and evaporate the ammonium tungstate solution and stir with…

The researchers produce coarse spherical tungsten powder by ammonium paratungstate reduction using ammonium tungstate solution as a raw material, and adding additives containing Li, Na, and K alkali metal salts. More details, please visit: http://ammonium-paratungstate.com/index.html Ammonium Paratungstate Reduction Producing Coarse Spherical Tungsten Powder Add Li2CO3, NaCl or Li2CO3, NaCl and KCl to 1L of ammonium tungstate solution, stir quickly to make it completely dissolved to make mother liquor, crystallized at a temperature greater than 50 °C. Add the solution continuously…

The researchers used APT oxidation reduction to produce submicron spherical tungsten powder, which has advantages of less pollution, narrow particle size distribution, simple equipment, simple and easy process line. Also, it is easy to control process parameters. And it is suitable for industrial mass production. The obtained tungsten powder is spherical, which is beneficial to the shrinkage and uniformity during calcination process, so as to better control the grain size. More details, please visit: http://ammonium-paratungstate.com/index.html APT Oxidation Reduction Producing Submicron…

The researchers used tungsten-containing waste to prepare ammonium paratungstate (APT) by leaching, extraction and ammonium sodium double salt method. Therefore, tungsten is effectively recovered. The quality of the prepared APT is higher. And it can further prepare tungsten oxide from APT. This method reduces the process cost by effectively recycling the salt-containing waste liquid generated in the process, which is worthy of vigorous promotion. More details, please visit: http://ammonium-paratungstate.com/index.html A process for preparing ammonium paratungstate using tungsten-containing waste, including the…

The researchers prepared ultrafine tungsten powder by the chlorination process. The obtained W powder has the characteristics of high purity, fine particles, uniform particle size distribution, spherical particles, and high thermal stability. Moreover, the ultrafine alloy made of tungsten chloride powder has good physical and mechanical properties, and is an ideal material for finishing, especially for watch processing. More details, please visit: http://tungsten-hexachloride.com/index.html Preparation of Prepare Ultrafine Tungsten Powder by Chlorination Process The chlorination is carried out in quartz equipment.…

Tungsten hexachloride is an important tungsten source for producing tungsten carbide composite catalytic material with platinum-like catalytic properties. For example, some researchers used tungsten hexachloride as the source of tungsten, the stripped montmorillonite sheet as the carrier, and combined the chemical impregnation method with the in-situ reduction carbonization technology to prepare tungsten carbide composite catalytic material – a nanocomposite of tungsten carbide and montmorillonite. More details, please visit: http://tungsten-hexachloride.com/index.html Wherein, tungsten carbide has platinum-like catalytic properties because its extranuclear electrons…

Tungsten hexachloride can be applied for preparing porous WO3 film. Wherein, porous WO3 film is a common gas-sensitive material with excellent gas-sensing performance and gasochromic performance. In addition, it is a typical electrochromic material, and is considered to be one of the most promising electrochromic materials. Tungsten hexachloride (WCl6) is a raw material for preparation of new material that can be used in the chemical industry for catalytic applications, as well as in the glass industry, mainly for the production…

Generally, hydrogen is used to reduce tungsten hexachloride to produce ultrafine tungsten powder. And this method is also known as tungsten hexachloride hydrogen reduction method to prepare ultrafine tungsten powder. It includes preparation of WCl6 and reduction of WCl6 into tungsten powder. More details, please visit: http://tungsten-hexachloride.com/index.html The chlorination reaction of tungsten is: W+3Cl2→WCl6 In the reaction, if multiple chlorides are formed, they need to be removed by fractional distillation according to the boiling points of various chlorides. The hydrogen…

Under COVID-19, demand for tungsten alloy shielding in medical CT equipment is increasing. Many manufacturers are increasing the output of tungsten alloy shields needed for medical imaging equipment CT, such as tungsten alloy anti-scatter grids, tungsten alloy plates, tungsten alloy tubes and tungsten alloy collimators (pre-patient collimators and post-patient collimators), to support the CT examination during the epidemic of the novel coronavirus (COVID-19). More details, please visit: http://www.tungsten-alloy.com/tungsten-alloy-radiation-shielding.html CT examination is an important method for the evaluation and diagnosis of…

As a new lead-free X-ray radiation protection, polymer tungsten apron is expected to replace traditional lead apron. That is because lead is a toxic shielding material and its radiation shielding performance is not so good as tungsten alloy. It means that tungsten apron is lightweight to place less burden on doctors. More details, please visit: http://poly-tungsten.com/index.html Polymer tungsten apron is made using natural rubber emulsion and tungsten powder as raw materials through special processing technology. Such a shielding apron is…