Study and optimization of copper molybdenum ore crushing closed cycle

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For optimizing control of ore preparation processes, a complex criterion “yield of productive class −2... +10 mm” adapted to the conditions of closed cycle crushing – screening was proposed, which reflects the efficiency of all the processes as a whole. The established dependences of yields of individual ore grain-size fractions and the proposed optimization criterion on the parameters of the crushing process show their relationship with energy intensity of the process. It was shown that increasing load on the screen causes decreasing screening efficiency and increasing mass fraction of +2 mm grain-size fraction in the circulating ore. Excessive increasing width of the crusher relieve slot causes increasing output of the circulating product and increasing energy consumption. Decreasing relieve slot below 7.5 mm leads to increasing yield of −2 mm fraction. Improved system and algorithm for visiometric analysis of ore grain-size were proposed and tested. Ore grain-size control sensors are located above the conveyors for transportation of the screening oversize and undersize. The visiometric analysis mode provides for consecutive switching on/off the feeding conveyors and crushers, which ensures the flow of crushed product from one crusher into the measurement zone. Total duration of the grain-size analysis for ores from 6 crushers amounts to 12 minutes that does not affect the final productivity. The developed algorithm application enables significant increasing accuracy of the crushed ore grain-size analysis and reducing energy consumption at the ore preparation stage.

About the Authors

V. Morozov
National University of Science and Technology "MISiS"
Russian Federation
Valery Morozov, Dr. Sci. (Tech.)

T. Nikolaeva
National University of Science and Technology "MISiS"
Russian Federation
Tatiana Nikolaeva, Cand. Sci. (Tech.)

I. Churelchuluun
Erdenet Mining Corporation


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For citation: Morozov V., Nikolaeva T., Churelchuluun I. Study and optimization of copper molybdenum ore crushing closed cycle. Gornye nauki i tekhnologii = Mining Science and Technology (Russia). 2018;(3):35-44.

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