Controlling of Fumed Silica Particle Size Uniform Production Process Based on Burner Fluid Dynamic Simulation

Abstract

As one of the most important high-tech nanomaterials, fumed silica has been widely used in many industrial fields due to its unique properties. However, particle size uniformity is still the technical barrier in this industry after years of development. Therefore, numerical simulations are employed to optimize the process parameters of a premixed multiring high-speed jet oxyhydrogen combustion reactor, and the result is applied to actual process units used in fumed silica production. By maintaining temperature consistency between inlet 2 and inlet 1 and increasing the gas flow rates of inlet 3 and inlet 4, the HCl flow and temperature field distribution in the reactor are improved significantly. The back mixing of HCl and the blocking of particles to the combustion reactor are suppressed. Compared to the original process, the median diameter (D50) of agglomerates particles and the 45 μm sieve residue content are decreased by 6.4 μm and 19.0 mg g–1, respectively. In addition, the tensile strength of high-temperature vulcanized rubber is increased by 1–1.5 MPa. The presented simulations provide technical support for quality improvements of fumed silica and a theoretical basis for the rational design of industrial combustion reactors.

Synthesis, Characterization, and Swelling Properties of a New Highly Absorbent Hydrogel Based on Carboxymethyl Guar Gum Reinforced with Bentonite and Silica Particles for Disposable Hygiene Products

“…This is supported by the XRD pattern of pure bentonite (Bt) by peaks shown in Figure e (22.08°, 24.91°, 25.87°, and 33.13°) . Finally, Figure f represents a fumed silica (Si) pattern that reveals a characteristic broad peak centered at 22.38° …”

“…67 Finally, Figure 5f represents a fumed silica (Si) pattern that reveals a characteristic broad peak centered at 22.38°. 68 3.2.6. Morphology Analysis.…”

Reinforcing Performance of Silane-Modified Recycled Nanosilica within Sustainable, Non-black-filled Styrene–Butadiene Rubber Nanocomposites

“…Also, considering Figure , almost no hydrophilic functional group was detected on the 2F silica nanoparticles’ surface, resulting in the lowest nanosilica–nanosilica interaction among silica nanoparticles investigated in this study. Consequently, in contrast to the 1F and GNSi nanosilica agglomerates, 2F nanosilica has appeared to have a more hydrophobic surface, and its aggregates have illustrated an opened fractal-like structure with low sphericity closely resembling those in pyrogenic (fumed) silica particles, − regarding Figure b,e. Subsequently, comparing 1F and GNSi nanoparticles, 2F nanosilica has owned relatively low-density aggregates with a higher potential to branch.…”

Investigation of Polisher Head and Slurry Sweep Effect in Oxide Film Polishing

“…These nucleated nanoparticles subsequently collide and aggregate into larger particles. 22 The rigid particles can indent on the hydrolyzed oxide film surface and abrade the surface while sliding. 23 Furthermore, the bump-shaped fumed silica particles exhibit shallower penetration depths to produce a smoother surface.…”