Standardization of tertiary crusher circuit operation at the Sarcheshmeh copper complex by process audit

Maleki Moghaddam, Mostafa; Zare, Saeed; Yahyaei, Mohsen; Banisi, Samad

doi:10.22034/ijme.2020.37380

Standardization of tertiary crusher circuit operation at the Sarcheshmeh copper complex by process audit

Document Type : research - paper

Authors

Mostafa Maleki Moghaddam ¹

Saeed Zare ²

Mohsen Yahyaei ³

Samad Banisi ⁴

¹ Mineral Processing Group, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran

² Kashigar Mineral Processing Research Center, Shahid Bahonar University of Kerman, Kerman, Iran

³ Research Fellow/ The University of Queensland

⁴ Mining Engineering Department, Shahid Bahonar University of Kerman, Kerman

10.22034/ijme.2020.37380

Abstract

The most effective way of maximizing the throughput is to maintain the highest possible crusher power draw which has been practised in various plants. A process audit at the Sarcheshmeh copper complex tertiary crushing circuit indicated that the crushing efficiency at this stage was lower than the target value. To initiate the standradzation process, the power data were transferred to the control room and the ultrasound level sensor was used to monitor the level of the material in the crushing chamber. The high variation in the power draw and some basic problems justified the use of process standardization through process inspections. The first problem was non-uniform feeding of crushers which was alleviated by changing the feed chute design. The uniform distribution of the feed increased the life time of the fixed bowl by twofold and reduced the standard deviation of the power draw measurements from 8.5 to 3.2 kW. The lower feed tonnage compared to the design value (531 t/h) was the second challenge which was resolved by increasing the height of the feeder adjustment plate, removing the blocked part of the feeder and increasing the feeders speed. The resulting increase in the feed rate from 350 to 540 t/h reduced the operating time of the crushing circuit by 18%. Another difficulty was not taking full advantage of the control loops which was made operational by a series of corrective actions which decreased the number of crusher shutdowns from 10 times to 1. The coarse particle entrance to the under screen product was the fourth problem. In order to minimize this problem, the large gap between the screen frames and the screen cloth was eliminated and screen ear rings were installed. By implementing these modifications, the amount of product (percentage of passing 12.7 mm) increased from 65% to 80%.

Keywords

Cone crusher

Feeder

Automatic control

Level gauge

Power draw

20.1001.1.17357616.1398.14.45.1.8

منابع
1. Flintoff. B. C and Mular. A. L; 1991; "The Plant Audit", A Practical Guide to Process Controls in the Minerals Industry, UBC, Brenda, P.P. 48.
2. Hamid-Reza Manouchehri; 2014; "Changing the game in comminution practices: Vibrocone TM, a new Crusher having grinding performance" IMPC 2014. C0927.
3. Herbst, J.A., & Potapov, A.V.; 2004; "Making a Discrete Grain Breakage model practical for comminution equipment performance simulation" Powder Technology, 143-144, 145-150.
4. Li, Huiqi, McDowell, Glenn, R., Lowndes & Ian.; 2014; "Discrete element modelling of rock comminution in a cone crusher using a bonded particle model" Geotechnique Letters, 4, 79-82.
5. Bengtsson, M,; 2009; "Quality-driven production of aggregates in crushing plants” Ph.D. thesis, Chalmers.
6. Major, K.; 2009; "Factors influencing the selection and sizing of crushers” In: Malhotra, D., et al., (Eds.), Recent Advances in Mineral Processing Plant Design. SME, Englewood, CO, USA, pp. 356360.
7. National Iranian Copper Industries Company; 1997; "Fine Crushing and Fine Ore Storage, Operating Manual”.
8. Wills, B.A., Finch, G. A.; 2016; Wills’ "Mineral Processing Technology” Butterworth-Heinemann (Elsevier).
9. Legendre, D., & Zevenhoven, R.; 2014;"Assessing the energy efficiency of a jaw crusher ” Energy, 74, 119-130.
10. Jacobson, D., Janssen, P., & Urbinatti, V.; 2010; "Cavity level’s effect on cone crusher performance and production" 7th International Mineral Processing Seminar.
11. Quist, J.; 2012; "Cone crusher modelling and simulation" Master of Science thesis: Goteborg, Sweden, 1652–9243.
12. Lindqvist, M., Evertsson, M., Chenje, T., & Radziszewski, P.; 2006; "Influence of particle size on wear rate in compressive crushing" Minerals Engineering, 19, 1328-1335.
13. Lichter, J., Lim, K., Potapov, A., & Dean, K.; 2009; “New developments in cone crusher performance optimization" Minerals Engineering, 22, 613-617.
14. P. A. Cundall,;1979; “A discrete numerical model for granular assemblies" Geotechnique,vol. 29, pp. 47-65, 1979.
15. B. K. Mishra and R. K. Rajamani,;1992; “The discrete element method for the simulation of ball mills" Applied Mathematical Modelling,vol. 16, no. 11, pp. 598-604, 1992.
16. King, R.P.; (2001); “Modeling and Simulation of Mineral Processing Systems”, Butterworth – Heinemann.
17. Delaney, G.W., Morrison, R.D., Sinnott, R.D., Cummins, S., & Cleary, P.W.; 2015; “DEM modelling of non-spherical particle breakage and flow in an industrial scale cone crusher ”. Minerals Engineering , 74, 112-122.
18. Quist, J., & Evertsson, C.; 2011; “Application of discrete element method for simulating feeding conditions and size reduction in cone crushers ”. Brisbane, QLD, Australia: XXV International Mineral Processing Congress (IMPC), 3337-3347.
19. Cunha, E.R., Carvalho, R.M., & Tavares, L.M.; 2010; “Simulation of solids flow and energy transfer in a vertical shaft impact crusher using DEM ”. Minerals Engineering, 43-44, 85-90.
20. P.W. Cleary; M.D. Sinnott; R.D. Morrison; S. Cummins.;2017; “Analysis of cone crusher performance with changes in material properties and operating conditions using DEM”. Minerals Engineering, Pages: 49-70, Vol: 100.
21. Erikson, M.T.; 2014; “Innovations in comminution equipment: high pressure grinding rolls, semi-autogenous grinding, ball mills, and regrind mills”. In: Anderson, C.G., et al., (Eds.), Mineral Processing and Extractive Metallurgy: 100 Years of Innovation. SME, Englewood, CO, USA, pp. 65-76.
22. Kelsey, C., Kelly, J.; 2014; “Super-fine crushing to ultra-fine size, the IMP” super-fine crusher”. 27th International Mineral Processing Cong., (IMPC), Ch 9. Santiago, Chile, pp. 239-252.
23. D Muller*, P.G.R de Villiers**, G Humphries. “A Holistic Approach to Control and Optimisation of an Industrial Crushing Circuit”. 13th Symposium on Automation in Mining, Mineral and Metal Processing Cape Town, South Africa, August 2-4, 2010.
24. Joseph, E. A., Olaiya O. O.; 2018; “Cohen-Coon PID Tuning Method: A Better Option to Ziegler Nichols-Pid Tuning Method”, Computer Engineering and Intelligent Systems, Vol.9, No.5.