• Procesna tehnika i zaštita životne sredine, Semester 1, position 2

The objective of the course is to students get theoretical and practical knowledge of common mechanical and hydromechanical processes and the associated equipment utilized in mineral processing. Course acquaints the students with characteristics of bulk solid materials and the basics techniques for bulk solid characterization. Mechanisms and basic principles of size reduction are covered. Subject gives overview of the main unit operations with respect to comminution (crushing and grinding) and screening/classification met in nowadays practice as well as equipment used in the unit operations. The combination of unit operations and equipment into circuits is also covered, as well the calculation of the basics characteristics of the equipment used.

After completing the course the students are expected to able to calculate and use the curves for particle size distribution. Students shall know the most important unit operations in mineral processing, the mechanisms and principles of size reduction and methods used to classify particles according to their size and their characteristics. Student will be able to identify and select the equipment involved in a comminution circuit and calculate basics characteristics of the equipment. The students should know the principles for designing mineral processing circuits. After completing the course students will be capable to apply their knowledge in the real case studies of mineral processing and will have required background knowledge for mineral concentration processes.

1. Introduction to mechanical and hydromechanical operations, 2. Characteristics of size reduction processes, particle size and shape estimation, 3. Particle size analysis, sieve analysis, 4. Principles of comminution, comminution theory, 5. Crushing (basic principles, reduction ratio, crushers – types, constructions and operating principles, nip angle, critical operating speed, capacity, power consumption), 6. Grinding (basic principles, reduction ratio, types and construction of mills, operating principles, charge of mills – volume, types, wear etc, mill rotation and critical speed, mill capacity, mill power), 7. Comminution circuits (circulation load ratio, influence of circulation load ration on mill capacity, optimal value of circulation load ratio), 8. Screening (performance of screens, efficiency of screening, screening surfaces, probability of particle passage, kinetics of screening, screen types, factors affecting screen performance, screen capacity), 9. Classification (principles of classification, free settling, hindered settling, efficiency of separation, partition curve, air classifiers, cyclones, hydraulic classifiers – horizontal current classifiers, vertical current classifiers, centrifugal current classifiers (hydrocyclones), 10. Mixing

1. Characterization of particle size and shape, 2. Particle size distribution and sieve analysis, 3. Crushing – practical problems, 4. Grinding – practical problems, 5. Laboratory – sieve analysis, 6. Bulk material handling – transportation and feeding, 7. Screening – practical problems, 8. Classification – practical problems (air classifiers, cyclones, hydraulic classifiers), 9. Practical problem – calculation of industrial venting system (selection and cyclone dimensioning, pipeline calculation), 10. Mixing – practical problems

Obligatory subject of elective module Process engineering and environment protection.

1. Bogner Martin: Mechanical operations, Naučna knjiga, Belgrade, 1987. 2. Bogner M, Stanojević M, Livo L: Cleaning and filtration of gasses and liquids, ЕТА, Belgrade, 2006. 3. Knežević Dinko: Mineral processing, University of Belgrade, Faculty of Mining and Geology, Belgrade, 2012. 4. Ćalić Nadežda: Principles of mineral processing, University of Belgrade, Faculty of Mining and Geology, Belgrade, 1990. 5. Magdalinović Nedeljko: Size reduction and classification, Nauka, Belgrade, 1999. 6. Laboratory installation for coal grindability testing and particle size distribution, Laboratory for Process Engineering

Total assigned hours: 75

New material: 20
Elaboration and examples (recapitulation): 10

Auditory exercises: 19
Laboratory exercises: 2
Calculation tasks: 0
Seminar paper: 0
Project: 9
Consultations: 0
Discussion/workshop: 0
Research study work: 0

Review and grading of calculation tasks: 0
Review and grading of lab reports: 3
Review and grading of seminar papers: 0
Review and grading of the project: 3
Test: 0
Test: 4
Final exam: 5

Activity during lectures: 5
Test/test: 10
Laboratory practice: 5
Calculation tasks: 0
Seminar paper: 0
Project: 10
Final exam: 70
Requirement for taking the exam (required number of points): 16

Barry A. Wills, Tim Napier-Munn: Mineral Processing Technology, Elsevier Science & Technology Books, 2006.; A. Gupta, D.S. Van: Mineral Processing Design and Operations - An Introduction, Elsevier, 2006.; R.P. King: Modeling and Simulation of Mineral Processing Systems, 2nd edition, Society for Mining, Metallurgy, and Exploration, Inc, 2012.; Warren McCabe, Julian Smith, Peter Harriot: Unit operations of chemical engineering, fifth edition, McGraw-Hill, 1993.; ***: Basics in Minerals Processing, Metso Corporation, 2015.