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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…

Tungsten alloy X-ray shielding collimator refers to a tungsten alloy collimator having excellent X-ray shielding performance, which is better than a lead collimator. Tungsten alloy is well-known as a non-lead shielding material, a non-toxic shielding material and an environmentally shielding material. While lead is a toxic shielding material. So, nowadays lead collimators are mostly replaced by tungsten alloy collimators. More details, please visit: http://www.tungsten-alloy.com/tungsten-alloy-radiation-shielding.html Tungsten alloy X-ray shielding collimator, as a beam limiting device, is used in the head of…

WO3 composite coating is a good choice for formaldehyde degradation. It is the photocatalytic performance of tungsten trioxide that make WO3 composite coating have the performance of degrading formaldehyde, thereby improving air quality and human health. More details, please visit: http://tungsten-oxide.com/index.html Preparation of WO3 Composite Coating for Formaldehyde Degradation Step One: Weigh a certain amount of H2WO4, and calcine the weighed H2WO4 at different temperatures for 5-8 h to prepare a WO3 visible light photocatalyst. Step Two: The prepared WO3…

Ammonium metatungstate is used as the active component in the preparation of honeycomb ceramic catalyst. And the prepared high specific surface area porous honeycomb ceramic catalyst is particularly suitable for soot purification in thermal power plants, glass plants, chemical plants and other fields. More details, please visit: http://www.ammonium-metatungstate.com/index.html A Method for Preparing High Specific Surface Area Porous Honeycomb Ceramic Catalyst Using titanium dioxide, montmorillonite and α alumina as the carrier, ammonium metatungstate, ammonium metavanadate, cerium nitrate and palladium acetate as…

The researchers proposed a new two step ion exchange method for the preparation of high purity ammonium paratungstate. This method overcomes the shortcomings of low tungsten adsorption capacity, low concentration of crude sodium tungstate feed liquid, and large dilution of feed liquid in the ion exchange process using strong basic anion exchange resin, while maintaining certain advantages. More details, please visit: http://ammonium-paratungstate.com/index.html Preparation of High Purity Ammonium Paratungstate by Two Step Ion Exchange Use porous strong basic anion exchange resin…

Thermal decomposition process of APT is the thermal decomposition process of ammonium paratungstate. The researchers have proposed a detailed and systematic decomposition mechanism of ammonium paratungstate under inert gas on the basis of summarizing previous research results. More details, please visit: http://ammonium-paratungstate.com/index.html Thermal decomposition process of APT mainly includes the following four steps: Step One: At 50-180 °C, lose all crystal water to form anhydrous ammonium paratungstate; Step Two: At 190-280 °C, lose NH3 to form an amorphous compound; There…

Preparation of ammonium paratungstate by two step ion exchange method is a process of preparing high-purity APT by twice ion exchanges. More details, please visit: http://ammonium-paratungstate.com/index.html Preparation of High-purity Ammonium Paratungstate by Two Step Ion Exchange Method Step One: Absorb tungsten by porous strongly basic anion exchange resin from alkaline solution, and then acidify the pH value of solution to 2.5-4 by desorption solution; Step Two. Absorb tungsten by using acrylic type weakly basic anion exchange resin, and then desorb…

The solvent extraction method is one of many methods of preparing ammonium paratungstate. The conversion rate of this method is high. And the mother liquor can be incorporated into the feed liquid for recycling. Also, the back extraction liquid can be used repeatedly. And it can even be used as agricultural fertilizer after reaching a certain ammonium concentration. More details, please visit: http://ammonium-paratungstate.com/index.html Preparation of Ammonium Paratungstate by Solvent Extraction Method Step One: Dissolve sodium tungstate solid in a small…