Increasing Process Efficiency Granulation in A Turbulized Layer Pelletized Materials
In this article, the possibility of increasing the efficiency of the process of granulating pelletized chalk in a turbo-blade apparatus by organizing preliminary grinding of the feedstock has been experimentally studied and proven. For this purpose, the design of a turboblade apparatus with combined grinding and granulation zones, which proceed sequentially in one apparatus, has been proposed. Experiments on grinding pelletized chalk by changing the angular speed of rotation of the working shaft and the pitch of placing grinding rods in the grinding zone showed the effectiveness of the process. Before grinding, the original chalk had 8 fractions with sizes from 0.5 to 4.0 mm; after grinding, the number of fractions was reduced to 5 with fraction sizes from 0.01 to 1.0 mm, with 79% of the crushed chalk being particles up to 0.1 mm. Analysis of the obtained results on grinding in the range of angular velocities from 78.3 to 230.3 s-1 revealed an increase in the specific surface area of particles by 1.4 - 2.2 times. Granulation of chalk in a turbo-blade apparatus made it possible to improve the granulometric composition from 70-85% to 94.7%, as well as the presentation of the product. Moreover, the main share of granulated chalk meets the requirements of the standard, i.e. 86.7% of the product consists of fractions with an equivalent diameter of 2 to 4 mm. Data analysis showed that the combination of grinding and granulating processes makes it possible to achieve an intensification of the granulating process of up to 25% while reducing one process and the corresponding apparatus. By summarizing the experimental data on chalk granulation, a calculation formula was derived for determining the granulometric composition with an error of 4.2%. Based on research, an energy-efficient technology for producing granules of bulk, pelletized materials and solid waste from chemical production has been proposed.