成人a毛片手机免费播放-成人a毛片在线看免费全部播放-成人a视频高清在线观看-成人a视频片在线观看免费-欧美三级中文字幕hd-欧美三极

Ammonium metatungstate is a white crystalline salt with the chemical formula of AMT. It is described as the most important raw material for all other tungsten products, so its preparation is of great significance. At present, there are many preparation methods of ammonium metatungstate. And it can be divided into two main preparation methods, i.e., solid phase conversion method and liquid phase conversion method. More details, please visit: http://www.ammonium-metatungstate.com/index.html Ammonium Metatungstate Preparation A solid phase conversion method, such as using…

Ammonium metatungstate decomposition temperature varies with the degree of completion of the decomposition reaction. This also means that ammonium metatungstate will produce different products at different decomposition temperatures. More details, please visit: http://www.ammonium-metatungstate.com/index.html Decomposition Temperature and Decomposition Products of Ammonium Metatungstate 1. When the heat treatment temperature is 200-300 °C, all crystal water and most of the ammonium ions are removed; 2. A phase transition occurs at a temperature of 300-350 °C to generate metastable tungsten oxide; 3. When the…

Ammonium metatungstate (AMT) is a white crystal powder or yellowish crystal powder with good water solubility, which can be used for preparation of diesel hydrogenation catalyst. For example, the researchers have proposed a method for preparing FCC diesel hydrorefining catalyst by using ammonium metatungstate as an active component. More details, please visit: http://www.ammonium-metatungstate.com/index.html Preparation of Diesel Hydrogenation Catalyst with Ammonium Metatungstate Mix aluminum hydroxide dry glue, binder, squeeze aid and deionized water, and knead 3 times to squeeze into 1.5…

How to prepare ammonium metatungstate crystal? Or how to prepare AMT crystal? There are various preparation methods, such as thermal decomposition method, neutralization method, solvent extraction method, tungstic acid method, ion exchange method, etc. More details, please visit: http://www.ammonium-metatungstate.com/index.html Preparation of Ammonium Metatungstate Crystal by Thermal Decomposition Mix ammonium paratungstate (APT) and a small amount of citric acid catalyst fully, put into a far-infrared rotary furnace to decompose at the temperature of 200-280 °C for about 1 h. Some ammonia…

How to prepare high purity ammonium metatungstate crystal? The researchers proposed a method for preparing high-purity AMT crystals – neutralization-nanofiltration coupling process. This method can not only obtain a high concentration AMT solution to reduce the cost for the subsequent crystallization process, but prepare AMT with less impurity content to ensure the preparation of high purity ammonium metatungstate. More details, please visit: http://www.ammonium-metatungstate.com/index.html A Preparation Method of High Purity Ammonium Metatungstate Crystal Add dilute nitric acid to ammonium paratungstate (APT)…

Tungsten alloy shield will be more and more popular in a medical CT room. You know, CT device is a common medical equipment that mainly uses X-rays for image diagnosis. For these X-rays, effective shielding protection is required to ensure the safety of professional operators and the patients and their family members. Therefore, each wall and protective door of the medical CT room are specially designed. More details, please visit: http://www.tungsten-alloy.com/tungsten-alloy-radiation-shielding.html For example, there may be tungsten alloy plates on…

Tungsten alloy radiation shielding sheet is a lead-free shielding sheet that has excellent radiation shielding performance to X-rays and γ-rays, so it is mainly applied for CT room. Although walls of CT rooms have built with 37 solid bricks and the walls are coated with barium sulfate protective material (the ground and ceiling are also coated), the ceiling still needs to be protected by a lead plate of thickness of 3mm. Wherein, the lead equivalent depends on the parameters of…

Tungsten alloy sheet applied for mobile CT scanner refers to a radiation shielding sheet placed behind the detector of the scanner for absorbing X-rays (not absorbed by the detector). Nowadays, the design of medical equipment is developing in the direction of miniaturization and convenience while taking the performance into account, and the same is true of CT equipment. In order to “offload” the mobile CT device, it is very important to choose a proper shielding material. Compared with traditional lead…

Tungsten alloy tube can be used as a radiation shield in a mobile CT scanner. The tube is a sleeve made of tungsten alloy plate, with thickness of 1-5 mm. The tungsten alloy shielding tube has a slit with the same width as the detector for X-ray photon emission to realize CT imaging. More details, please visit: http://www.tungsten-alloy.com/tungsten-alloy-radiation-shielding.html Tungsten alloy shielding tube is installed in the scanning hole of the CT scanner for absorption of scattered X-ray photons. The tube…

Tungsten disulfide nanopowder, or WS2 nanopowder, is a new type of tungsten chemical product with a wide range of uses. It is mainly used as a petroleum catalyst, such as hydrodesulfurization catalyst. It is a very important additive for high-performance grease and lubricating oil. It can be used as a solid lubricant, dry film lubricant, and self-lubricating composite material. It can be used as an anode for fuel cells. It is a good semiconductor material. Tungsten disulfide nano particles can…