Experimental Investigation on the Multistage Particle Classification in a Zigzag Air Classifier
—In most industrial solid processing operations, the separation of particles is important and designed based on the terminal settling velocity as the chief operating parameter. This settling velocity is dependent on characteristic particle properties like size, density, and shape. In this work, multi-stage separation experiments of sand and gravel have been performed using different channel velocities and mass loadings of the air. The performance has been analyzed and discussed with respect to the separation functions, and characteristic parameters as separation sharpness and product quality. Furthermore, the SMART analysis is used to evaluate different parameter configurations.
Mehrstufige turbulente Aerosortierung von Bauschutt
To assess the efficiency of the separation of liberated aggregate particles of concrete rubble in a zig-zag classifier, the separation functions were determined and compared with a theoretical model of multistage turbulent cross-current separation. It could be demonstrated that, at a throughput between 3-16 t/(m 2 .h) related to the separation surface and a mass-related energy consumption of 0.2 to 8 kWh/t, the cross-current operating principle of this classifier is well suited for the separation of mineral materials, thanks to its acknowledged features such as its high separation efficiency and the variability of its geometry.
Evaluation of antioxidants by a rapid polarographic method
A simple, rapid, precise, and reproducible method and an adaptable apparatus for polarographic measurement of lipid peroxidation and antioxidant activity is described. This method measures antioxidant activity within a few min time as compared to the hours or days needed for several widely used methods. Peroxidation rates were measured for different lipids as a function of amount of lipid, and amount of biocatalyst. The method is applicable to the detection and measurement of the antioxidant effects exhibited by weak antioxidants and has been satisfactorily used for the measurement of the antioxidant activity of different concentrations of powerful antioxidants.