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Ion exchange method is used to prepare ammonium paratungstate. That is because this method has advantages of a short process flow, simple equipment and high tungsten recovery rate. Also, it can simultaneously complete the two tasks of impurity removal and transformation. In addition, it can significantly increase the concentration of tungsten trioxide in the pre-delivery solution and reduce the generation of wastewater. More details, please visit: http://ammonium-paratungstate.com/index.html Preparation of ammonium paratungstate by ion exchange method Step One: Tungsten concentrate is…

It is a new process to obtain tungsten trioxide by microwave heating ammonium paratungstate. The process requires a short calcination time (only 4min, while the traditional method takes about 2h), and the prepared yellow WO3 powder product is of good quality so that it is worth applying in industry. More details, please visit: http://ammonium-paratungstate.com/index.html Preparation of Tungsten Trioxide by Microwave Heating Ammonium Paratungstate Weigh 10g of dried ammonium paratungstate (WO3: 88.5% mass fraction) into the crucible, and record the weight…

The researchers proposed a method for preparing tungsten trioxide by using wet ammonium paratungstate as raw material. More details, please visit: http://ammonium-paratungstate.com/index.html Preparation of Tungsten Trioxide by Using Wet Ammonium Paratungstate Add 240 kg of wet APT with water content ≤8% to the silo every hour, and send the wet APT into the rotary furnace evenly through the double screw feeder. At 710 °C, the wet APT is decomposed by heating for 40 min to obtain WO3, NH3 and water…

How to recover tungsten and ammonium chloride from APT mother liquor? The researchers proposed a new type of recycling method of ammonium paratungstate mother liquor. The method is simple to operate, consumes a smaller amount of chemical reagents, has lower operating costs, and has a higher recovery rate of tungsten than traditional methods. In addition, the separated ammonium chloride solution can be new_ed to or used for other purposes after proper purification. More details, please visit: http://ammonium-paratungstate.com/index.html A Method for…

Thermal decomposition process of ammonium paratungstate has attracted much attention of researchers as it is an important raw material for preparing tungsten oxide (by calcining APT), and tungsten oxide is an important raw material for preparing tungsten powder by hydrogen reduction, and tungsten powder is an important raw material for preparing tungsten electrode by powder metallurgy. More details, please visit: http://ammonium-paratungstate.com/index.html Studies have shown that, there are four stages of the thermal decomposition process of ammonium paratungstate. The first three…

How to prepare high purity ammonium paratungstate? The researchers proposed an economical method for preparing high purity ammonium paratungstate with high yield and simple process. More details, please visit: http://ammonium-paratungstate.com/index.html A Preparation Method of High Purity Ammonium Paratungstate Pour 215 L of deionized water in a heated 200 L stirred reactor. Add 200 kg of APT·10H2O with stirring. Then, the suspension was treated at 90 °C for 2 h with stirring. When the molar ratio of NH3: W is 0.77:…

Tungsten heavy alloy shield is made with high tungsten content and low amounts of Ni, Fe or Ni, Cu. Some tungsten alloy shields are added Co, Mo or Cr, etc. The density of tungsten heavy alloy could be as high as 16.8-18.8g/cm3. More details, please visit: http://www.tungsten-alloy.com/tungsten-alloy-radiation-shielding.html Tungsten heavy alloy offers a number of advantages as a radiation shielding material for medical applications: 1. Good corrosion resistance under ambient conditions. 2. Low toxicity and completely lead-free. 3. Superior radiation attenuation…

Tungsten alloy post-patient collimator is present between the patient and the detector on a CT machine, which serves to ensure good image quality, minimize the interference of scattered rays from other directions, and to reduce unnecessary radiation doses for the patients. Tungsten alloy post-patient collimator improves the slice sensitivity profile by giving a more rectangular shape. More details, please visit: http://www.tungsten-alloy.com/tungsten-alloy-radiation-shielding.html There are a lot of tungsten alloy leaves on a collimator. And these leaves are evenly distributed. So it…

Tungsten alloy pre-patient collimator is the tungsten alloy collimator located in front of the X-ray tube on a CT machine, with characteristics of high density, smooth surface and good dimensional accuracy. Tungsten alloy pre-patient collimator is the first component through which X-rays pass, and is mainly used to control the thickness of the scanning layer by controlling the width of the X-ray beam in the direction parallel to the long axis of the human body. The X-rays emitted from the…

How to choose tungsten carbide thread milling cutter? Tungsten carbide thread milling cutters have two main types: single-row thread milling cutters and multi-row thread milling cutters. And there are different shanks including hydraulic shanks, spring shanks and hot tension shanks. More details, please visit: http://www.tungsten-carbide.com.cn/tungsten-carbide-blade-bar.html Firstly, take their applications in to account. The two types of tungsten carbide thread milling cutters have different applications. Tungsten carbide single-row thread milling cutter is used to process medium to large internal threads, or…