JSC «Uralmekhanobr» (Russia):

Gazaleeva G. I., Doctor of Engineering Sciences, Deputy Director General for Science, gazaleeva_gi@umbr.ru

Bratygin E. V., Ph. D. in Engineering Sciences, Head of Laboratory, umbr@umbr.ru

All-Russian Scientific Research Institute of Mineral Resources named after N. M. Fedorovsky (Russia):

Kurkov A. V., Doctor of Engineering Sciences, Professor, Deputy Director General for Technology, kurkov@vims-geo.ru

Rogozhin А. А., Ph. D. in Physics and Mathematics, First Deputy Director General, Head of Department, rogojin@df.ru

The paper presents a review of the criteria for choosing optimum ore preparation flow sheets. The authors analyzed the criteria for selectivity of crushing; a criterion, based on the results of optical microscopy – determination of valuable mineral liberation degree, is proposed. The final estimate of crushing process selectivity (selectivity criterion L₀) is performed through calculation of the ratio between quantity of free grains of valuable mineral in given size fraction of crushed material and quantity of free grains of valuable mineral in given size fraction of feed, taking into consideration yield of the size fraction in question. In addition to that, estimate of a specific crushing apparatus optimality of application is performed preliminarily by maximum reduction ratio of material, which is determined by size distribution in feed and crushed products, however, priority is given to maximum selectivity criterion. Verification of the proposed criterion was accomplished by comparison of the Vishnevogorskoye deposit niobium-bearing ores crushing in inertia cone crusher and centrifugal impact crusher. Also, various operating regimes of the crushers were tested. Comparison of selectivity criterion L₀ showed, with crushing in inertia cone crusher (ICC) its value is significantly higher, than in crushing in centrifugal impact crusher (CIC). For CIC crusher, criterion L0 is 0.82–0.87 units, while for ICC — 1.43–1.755 units. The most efficient operating regime for crusher ICC-300А, from viewpoint of providing the Vishnevogorskoye deposit niobium-bearing ores selectivity of crushing, is as follows: unbalanced mass slewing angle — 120°, rotary velocity of cone rotation — 23,67 s^–1, specific power consumption — 6.99 kW/t.

1. Jankovic A., Valery W. Advances in ore comminution practice over the last 25 years. Proceedings of the XVI Balkan Mineral Processing Congress, Belgrade, Cerbia, June 17–19, 2015, Vol. I, pp. 123–130.
2. Droblenie i sortirovka. Spravochnik (Crushing and screening. Reference book). Metso Minerals, Finland, CVL, Russia, 2007, 148 pp.
3. Hosseinzadeh Gharehgheshlagh H. Differences between estimated breakage distribution function via single particle breakage and bed breakage methods. Proceedings of the XV Balkan Mineral Processing Congress, Sozopol, Bulgaria, June 12–16, 2013, Vol. I, pp. 192–196.
4. Revnivtsev V. I., Gaponov G. V., Zarogatskiy L. P., Kostin I. M., Finkelshteyn G. A., Khopunov E. A., Yashin V. P. Selektivnoye razrushenie materialov (The selective destruction of materials). Moscow, Nedra, 1988, 286 pp.
5. Krasnov G. D., Chikhladze V. V. Features of destruction of minerals crushed by different methods. Problemy dezintegratsii mineralnogo i tekhnogennogo syrya v gornoy promyshlennosti i stroitelnoy industrii. Materialy II Mezhdunarodnogo nauchnoprakticheskogo seminara pamyati V. A. Olevskogo (Problems of disintegration of mineral and technogenic raw materials in the mining and construction industries. Proceedings of the International scientific and practical seminar in memory of V. A. Olevskiy). December 4–8, 2009, Stavropol, pp. 12–23.
6. Chanturiya V. A., Vaysberg L. A., Kozlov A. P. Promising trends in investigations aimed at all-round utilization of mineral raw materials. Obogashchenie Rud = Mineral Processing, 2014, No. 2, pp. 3–9.
7. Skamnitskaya L. S., Svetova Ye. N., Svetov S. A. Mineralogical-technological specialties of karelian quartz conglomerates as a nonconventional source of quartz material. Ibidem, 2014, No. 2, pp. 36–42.
8. Griesdorn M. New possibilities to influence pellet properties by photo-optical particle analyses. Proceedings of the XVI Balkan Mineral Processing Congress, Belgrade, Cerbia, June 17–19, 2015, Vol. I, pp. 115–123.
9. Gazaleeva G. I., Mamonov S. V., Yelnikova S. P. The mechanism of rocks destruction and its use in non-traditional methods of ore dressing. Materialy mezhdunarodnogo soveshchaniya «Progressivnyye metody obogashcheniya i kompleksnoy pererabotki prirodnogo i tekhnogennogo mineralnogo syrya (Plaksinskie chteniya) (Proceedings of the International conference «Progressive methods of enrichment and complex processing of natural and technogenic mineral raw materials» (Plaksin Readings)), September 16–19, 2014, Almaty, pp. 114–117.
10. Vaisberg L. A., Zarogatskiy L. P., Turkin V. Ya. Vibratsionnyye drobilki (Vibratory crushers). Saint Petersburg, VSEGEI Publishing House, 2004, 306 pp.
11. Savov S., Nedyalkov P., Mochev D. Particle size distributions of one cone inertial crusher (KID-300) products. Proceedings of the XV Balkan Mineral Processing Congress, Sozopol, Bulgaria, June 12–16, 2013, Vol. I, pp. 150–154.
12. Maltsev V. A., Svitov V. S. Technique and technology of centrifugal impact crushing. Gornyye mashiny i avtomatika, 2004, No. 3, pp. 38–40.