Improving the process of dosing ultrafine particles with vibration- electromechanical mixing

Abstract

A promising direction for improving the balance of the diet of livestock and birds by trace element composition is the enrichment of ultradisperse particles of scarce trace elements. At the same time, it is important that they are evenly distributed throughout the entire volume of the feed mixture. The purpose of the study is to increase the uniformity of the distribution of ultrafine particles in the feed mixture by developing special equipment and modernizing the technological process. The use of new technologies for the preparation of feed mixtures based on the control of technological parameters makes it possible to obtain a product with specified functional parameters and preservation of nutritional properties. Analysis of theoretical studies of the process of dosing and mixing of ultrafine particles has shown that the best option for their movement in the flow of the mixture is laminar. The designed processing line provides for the separate supply of pre-mixed feed mixture and ultraparticles to the vibrating mixer. The efficiency of the mixing process in a vibrating mixer was evaluated using three sections of a feed mixture with ultraparticles of iron, zinc, cobalt and molybdenum powders. The optimal working parameters are achieved at the angular velocity of the vibrating mixer - 3…7 rad / s, the oscillation frequency - 9...37 Hz, the vibration mixing time - 113...333 s, the opening time of the controlled dispenser (feeding ultrafine particles into the vibrating mixer) - 5 …15 s. When using a controlled ultraparticle detector and a spherical impeller, the particles in the feed were distributed more evenly. The lowest effect on the value of this indicator in three sections of the feed mixture was noted for zinc (up to 2.7 %), followed by iron powders (up to 3.6 %) and molybdenum (up to 9.5 %). The developed equipment had the greatest impact on the uniformity of cobalt distribution (up to 20.5 %). At the same time, the deviation from the norm (0.5 mg/kg) did not exceed 2 %, that is, the value of the qualitative indicator of uniformity of distribution was equal to 98 %.