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- Title
Product grinding influence on the drying process of dispersed titanium dioxide paste.
- Authors
Marchevskii, Victor; Grobovenko, Yaroslav
- Abstract
Introduction. The research purpose is to determine the effect of the degree of product grinding on the processes of drying titanium dioxide paste and the drying of finely divided particles of titanium dioxide to a low residual moisture content of 0.3%. Materials and methods. The processes of drying and post drying of fine disperse titanium dioxide paste in vortex fluxes of the heat carrier with the use of continuous grinding of the initial product were carried out in a conical dryer of the vortex type, which includes a special device for shredding the product - dispersant, feeder-dispenser and separation zone. Results and discussion. The initial moisture content of titanium dioxide was 50-55%. The processes of drying and post drying the paste of titanium dioxide in the vortex flow of the heat-carrier during the application of the original design of the drying apparatus with a knife dispersant and a zone of drying of the material occurred to a low residual moisture content of 0,3%. In this case, the temperature of the coolant at the inlet to the drying chamber was 120 °C, and the volume flow i.e. 50 m3/hour. During the process, the values of the temperature and humidity of the coolant were automatically measured at the inlet and outlet of the drying chamber and samples of dispersed particles were taken from the grinding zone. Experimentally established dependences for calculating the degree of grinding of z agglomerates of titanium dioxide paste and the value of the drying rate coefficient Kw for titanium dioxide, which is 0,17-2,5 m/s was obtained. In addition, the kinetics of the drying process completely described the drying curve, namely the initial moisture content of the paste was U0 = 1,17 kgw/kga.d.p., U1cr = 0,23 kgw/kga.d.p., equilibrium moisture content i.e. U2 = 0,003 kgw/kga.d.p.. In the first period, the paste was dried at 37 °C of wet thermometer. The optimum temperature conditions of the coolant for drying the titanium dioxide paste, which are 90-120 °C at the entrance to the drying chamber and 65-90 °C at the outlet was obtained. The result of calculating the mathematical model is the degree of grinding that is 10-15 conventional units. Conclusions. The kinetics and methods of intensification of the processes of grinding, drying and drying of agglomerates of titanium dioxide paste were investigated and the parameters necessary for designing industrial drying machines were established.
- Subjects
DRYING; TITANIUM dioxide; MOISTURE content of food; MATHEMATICAL models; DRYING agents
- Publication
Ukrainian Journal of Food Science, 2018, Vol 6, Issue 1, p72
- ISSN
2310-1008
- Publication type
Article
- DOI
10.24263/2310-1008-2018-6-1-10