Synthesis of high-purity micro-spherical ruthenium particles by chemical refining method

Synthesis and Characterization of Nanoscale Tungsten Particles with Hollow Superstructure Using Spray Drying Combined with Calcination Process

“…4. During spray drying, the HPG as another critical parameter which can influence the microstructure and particle size distribution was investigated, and the drying temperature, solution concentration, and gas/liquid rates were studied in our previous work [21, 22]. In this part of the experiment, the drying temperature, solution concentration, and gas/liquid rates were controlled at 210 °C, 0.01 mol/L and 5 nL/5 mL, respectively.…”

“…Moreover, different particle size distribution and microstructure of particles atomized can be obtained by controlling spray drying parameters [16, 18, 20, 22, 23]. In our previous study, high-performance ruthenium, micro-spherical tungsten-molybdenum alloy, and ruthenium compound particles were achieved by the spray drying process [21–23]. Therefore, the spray drying method can be chosen to synthesize nanoscale spherical W particles by optimizing spray drying parameters.…”

Synthesis and Characterization of High-Purity Ultrafine Platinum Particles by Chemical Refining Method

“…Spray-drying is a known method for producing spherical particles due to the instantaneous transition from the liquid (solvent) to the solid (solute) phase [13][14][15][16][17][18][19]. Compared with other drying technologies, spray-drying is clean, rapid, reproducible, inexpensive, and easily scaled up, which is why it is widely used in industrial milling [14,17,18]. During the process of spray-drying, the solution (solute-solvent) is completely atomized and dispersed into the chamber (hot gas) when interacted with the high-pressure gas at the nozzle.…”

“…Afterward, the atomized fogdrops evaporate in the drying chamber and form spherical or near-spherical solid particles simultaneously. The powder prepared by spray-drying has high dispersibility and good sphericity and homogeneity [13,18,19]. Moreover, it is of high purity since no impurity is introduced during the spray-drying stage.…”

“…The particle size distribution ranging from 0.5 to 5 μm can be obtained by controlling spray-drying parameters, because the result is heavily affected by the parameters [19]. Therefore, spray-drying is an effective way to prepare a high-purity ultrafine powder [18,19].…”