Study Of Effects Of Structural Parameters Of The Screw To The Materials In A Rotary Kiln For Calcination Of Selenium Dioxide

Rotary kiln is widely used in metallurgical industry. This kind of equipment can be used for ore roasting and other intermediate heating treatment. Normally, a screw is placed in the cylinder body of rotary kiln for calcination of selenium dioxide. When the rotary kiln cylinder rotates, the screw will oscillate and rotate with the cylinder. The screw makes sure that the bonding materials can be crushed and evenly conveyed. The screw’s structure parameters will directly affect the breakage effect,material layer heat dissipation capacity and the mean residence time (MRT). In the process of predecessors’researches, most relative researches are without screw. Forefathers’ researches are only stay in the technical innovation level of actual production. There is no improvements to the screw structure. Through the optimization of screw parameters, it is beneficial to improve the efficiency of screw breakage, reduce the adhesion rate of wall material in the cylinder body, improve the efficiency of roasting and improve the MRT of materials.The rotary kiln for calcination of selenium dioxide could be set as the study object and the specific work content is as follows:(1) Through the actual investigation in the plant and collecting relevant data from the website, the research status of rotary kiln could be described;(2) Aiming at the rotary kiln for calcination of selenium dioxide, through the CAD software of Solid Edge, the selenium dioxide kiln’s three-dimensional model could be established basing on the actual proportion; the basic structure and main parameters were described;(3) By the means of scaling, the simulating model of cylinder and screw were built up in Solid Edge. Then the model was imported into ADAMS. By this method, the screw’s rotating speed and time in the cylinder could be calculated. Then the rotating velocity and time could be imported into EDEM for simulation analysis. In the condition of cylinder without screw and cylinder with screw, related parameters of particles were extracted, and the screw’s influences on the particles’movement in the rotary kiln for calcination of selenium dioxide could be elaborated.(4) In actual producting process, only by changing the rotating speed, the reaction level of material in rotary kiln could be adjusted. Therefore the actual rotating speed could be changed in different and the result of the experiment could be analyzed; under the condition of simulation, the varying tendency of the particle parameters in rotary kiln could be obtained.(5) Basing on the above-mentioned modeling and simulation method, by using the software of Solid Edge, ADAMS and EDEM, the control variable method could be used as the test scheme. By changing the basic parameters of screw (screw pitch, outer diameter, shaft diameter and screw thickness) and extracting relative particles’ parameters in EDEM, the basic structure of screw could be optimized, and a group of best structural parameters could be get.