Authors : E.V. Ageev, A.Yu. Altukhov, A.V. Shcherbakov and A.N. Novikov
Abstract: To develop a technology for producing powdered chromium-containing materials by electroerosive dispersion and to evaluate the effectiveness of their use, complex theoretical and experimental studies are required. The purpose of this work was to study the dimensional characteristics of powders, obtained by electroerosive dispersion of chromium-containing waste. Determination of the particle size distribution of the powders was carried out on a laser particle size analyzer “Analysette 22 NanoTec” by the dispersion method. When dispersed, the measurement was carried out in a dispersion module for dry samples without ultrasound. In this module, agglomerates of dry samples are processed by mechanical and pneumatic forces. During the measurement, the sample comes from an elongated funnel to the vibro-feeder tray of a dry dispersing device. The dosed supply of the sample is carried out with the help of an original, vibrating tray feeder with adjustable amplitude. Dispersing is carried out in a two-phase nozzle with an annular gap by means of thin metal plates with aerodynamic formation of the waves at the nozzle exit and a high flow rate in the nozzle channel. Dosed portions of the sample are sent by compressed air into the dispersing nozzle (Two-stage nozzle) of the measuring device where the sample is dispersed with an additional adjustable air flow (air nozzle) once more and at an increased speed falls under the laser beam. It has been experimentally established that the powders, obtained by electroerosive dispersion of chromium-containing wastes, have the following dimensional characteristics: the average particle size is 23.86 μm; the arithmetic value is 74.859 μm; specific surface area-1552.99 cm2/cm3; the coefficient of elongation of particles with a size of 61.156 μm is 2.49.
E.V. Ageev, A.Yu. Altukhov, A.V. Shcherbakov and A.N. Novikov, 2017. Dimensional Characteristics of Electroerovine Chrome-Containing Powders. Journal of Engineering and Applied Sciences, 12: 6332-6334.