ORE PREPARATION | |
Название | Polygradient vibration separation technology testing |
DOI | 10.17580/or.2018.04.01 |
Автор | Bizyaev O. Yu., Ustinov I. D., Baldaeva T. M. |
Информация об авторе | REC «Mekhanobr-Tekhnika» (St. Petersburg, Russia) Bizyaev O. Yu., Chief Designer;
St. Petersburg Mining University (St. Petersburg, Russia): Baldaeva T. M., Postgraduate Student, baldaeva.t.m@gmail.com |
Реферат | The results of polygradient vibration separation tests for coal were analyzed and demonstrated that the use of a trapezoidal screening surface renders higher screening efficiency and specific screening capacity values as compared to a flat screen. This effect is due to the greater mobility of the granular material, with its finer particles exiting through the side walls of the trapezoidal screen and coarser particles released through the bottom screen surface. An analysis of previous research in the theory of vibration screening suggests that this effect of preferential separation of the finer fraction through the inclined screening surfaces of a trapezoidal sieve can be achieved even with the same mesh sizes of the side and bottom surfaces. This is due to the fact that particles close to the near-mesh grain size are less likely to pass through inclined sieve sections. The tests were carried out using a specially designed test bench based on a pilot-scale screen with orbital motion of the screen box. A flat and a trapezoidal sieve were installed on the screen. After a series of tests, the efficiency of coal screening on a flat sieve was 80.2 % for the grade of –4 mm and 81.3% for the grade of –1.6 mm, with the specific feed rate of 13.0 t/(h·m2). The efficiency of coal screening on a trapezoidal sieve was 84.4 % for the grade of –4 mm and 84.8% for the grade of –1.6 mm. The design specific performance for the horizontal projection of the screen was 15.9 t/(h·m2). |
Ключевые слова | Vibration separation, screening, granular material, polygradient separation, hard coal |
Библиографический список | 1. Levenson L. B. Machines for mineral processing: Flat mobile screens, their theory, calculation and design. Leningrad: Mekhanobr, 1924. 240 p. 9. Rongali R., Alam M. Higher-order effects on orientational correlation and relaxation dynamics in gomogeneous cooling of a rough granular gas. Phys. Rev. 2014. E89. 062201. |
Language of full-text | русский |
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