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Using Light Scattering to Screen Polyelectrolytes (PEL) Performance in Floccula...
Rasteiro, Maria G.; Pinheiro, Ineide; Garcia, Fernando A. P.; Ferreira, Paulo; Hunkeler, DavidFlocculation of precipitated calcium carbonate (PCC) was monitored using light diffraction spectroscopy (LDS). Four cationic polyacrylamides of high molar mass and with different degrees of branching, all copolymers of acrylamide (AM) and acryloyloxyethyltrimethyl ammonium chloride (Q9), were tested. LDS supplied information about the kinetic curves for flocs growth and also for the flocs structure evolution. F...
Flow dynamics of pulp fiber suspensions
Ventura, Carla; Garcia, Fernando; Ferreira, Paulo; Rasteiro, MariaThe transport between different equipment and unit operations plays an important role in pulp and paper mills because fiber suspensions differ from all other solid-liquid systems, due to the complex interactions between the different pulp and paper components. Poor understanding of the suspensions’ flow dynamics means the industrial equipment design is usually conservative and frequently oversized, thus contrib...
The Influence of Particle Size Distribution on the Performance of Ceramic Parti...
Rasteiro, Maria da Graça; Jorge, AlbanoDuring the preparation of ceramic glaze suspensions it is necessary to guarantee that the suspension possesses the required properties, with several parameters having to be rigorously controlled, e.g., particle size and solids concentration, composition of the suspension and ionic charge of the liquid. This study focuses attention on the influence of particle size distribution on three important properties of g...
Modeling pulp fiber suspension rheology
Ventura, Carla; Blanco, Angeles; Negro, Carlos; Ferreira, Paulo; Garcia, Fernando; Rasteiro, MariaRheological properties of pulp suspensions play a very important role in the industry, mainly due to the consumption of energy for transporting pulp among the different parts of the paper mill. In this work, we determined the rheology of long- and short-fiber bleached kraft pulp suspensions by using a new rotational viscometer especially designed for their analysis. The experimental rheograms were adjusted to t...
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