Investigation of the Precipitation of Barium Sulfate Nanoparticles

Abstract

Precipitation is a promising process for nanoparticle production because it is a fast, economic process and simple to design. In the present work, barium sulfate particles were produced by discontinuous precipitation in a stirred tank reactor. Particle sizes of less than 100 nm were achieved. Particle size distributions strongly depend on the mechanical mixing and the molar ratio of the reactants as well as on the stabilization of the particles in the suspension.

Modeling of Mixing‐Precipitation Processes: Agglomeration

“…To determine the amount of additive required to stabilize the particles under the investigated conditions, experiments were performed where the initial concentration of additive in the inlet, c add , was varied from 0 to 16 g kg -1 (concentration of polymer per mass of solution). We have observed that for all the supersaturations investigated, c add = 4.5 g kg -1 was sufficient to see no more change in the measured particle size, which is in agreement with the data reported in the literature [8,36,37]. In the next section (Sect.…”

“…Schwarzer et al have used a different system where the surface potential can no longer be approximated by Eq. (36) and the additional effect of adsorption of protons must be considered [9,38]. Vicum et al have employed the same system as the one in this work allowing for a comparison between simulation results, but they have studied the precipitation process in a continuous stirred-tank reactor (CSTR) where the assumption of a perfectly mixed system is no longer valid and the effects of mixing have to be considered [1,39].…”

Metals and sulphate removal from acid mine drainage in two steps via ferrite sludge and barium sulphate formation

“…It is also widely used as a pigment in paints, as a filler and extender in paints, varnishes, coatings and plastics. It is also used to achieve a high sun protecting factor in cosmetics, as packing material (Kresse et al, 2007;Patel et al, 2014;Petrova et al, 2008;Wang et al, 2009).…”

Experimental Investigation on Continuous Precipitation and Stabilisation of Ultrafine BaSO4

“…1000 nm mit Hilfe von Fällungsreaktionen kann in verschiedenen Reaktoren, z. B. T-Mischer, Rührkessel, realisiert werden [1,2]. Die erzeugten Primärpartikel sind jedoch meist nicht stabil gegenüber Agglomeration.…”