The use of continuous centrifugal gravity concentration in grinding circuit. Modified approach for improved metallurgical performance and reduced grinding requirements

• Autorzy: Altun N. E. , Sakuhuni G. , Klein B.

Identyfikatory

DOI

10.5277/ppmp150111

• Języki publikacji: EN

Abstrakty

EN

The use of centrifugal gravity concentration in the closed-grinding circuit of a gold-containing massive sulphide ore was tested on classifier underflow and overflow. A continuous Knelson CVD6 was retrofitted to the hydrocyclone underflow for recovery of Au and Pb at a coarser feed size. The objective of treatment of overflow was recovering unliberated Au prior to flotation. The tests were performed in actual operating conditions at Nyrstar’s Myra Falls Mine. The results of the tests on the cyclone underflow revealed that both liberated and unliberated Au and Pb were recovered by the Centrifugal Variable Discharge (CVD) concentrator. Concentrate grades <60g/Mg Au were attainable at a more than 20% recovery. This application also allowed early and increased Pb recovery before it became gravity unrecoverable by over-grinding. Other benefits included capturing middlings for regrinding as well as potential coarser grinding and increase in mill throughput. A coarse grind also corresponds to a reduction in deformation of Au-particles, and is beneficial for increased Au recovery in downstream processing. Treatment of cyclone overflow by the CVD also provided favourable results. The outcomes included capturing unliberated gold prior to flotation and potentially reducing pumping requirements and reagent consumption. A comparison of the metallurgical performances showed that CVD application on classifier underflow was more effective. The CVD was capable of recovering unliberated gold in sulphides and performed better at a coarser particle size. Therefore, when used with the grinding circuit, a coarser grind can be applied and the CVD could be used to reject gangue at a coarser size.

Słowa kluczowe

EN

centrifugal gravity concentrator; grinding; classification; liberation

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2015
• Tom: Vol. 51, iss. 1
• Strony: 115--126
• Opis fizyczny: Bibliogr. 7 poz., rys., tab.

Twórcy

autor

Altun N. E.

• Middle East Technical University, Mining Engineering Department, Ankara, Turkey

autor

Sakuhuni G.

• University of British Columbia, NBK Institute of Mining Eng., Vancouver, BC, Canada

autor

Klein B.

• University of British Columbia, NBK Institute of Mining Eng., Vancouver, BC, Canada

Bibliografia

• 1. BULATOVIC, S.M., 1997. ‘Flotation behaviour of gold during processing of porphyry copper-gold ores and refractory gold-bearing sulphides, Minerals Engineering, 10, pp. 895-908.
• 2. BYRON, R., ROBERTS, K., 2004. Flotation improvements in the Luzenac Pehhorwood talc concentrator, Proceedings 36th Annual Meeting of the Canadian Mineral Processors, Ottawa, Canada, pp. 177–188
• 3. GREWAL, I., FULLAM, M., 2004. Gravity Circuit Optimisation via Mathematical Modelling by Particle Size Classes, Technical Notes, Knelson Gravity Solutions.
• 4. HONAKER, R.Q., WNAG, D., HO, K., 1996. Application of the Falcon Concentrator for Fine Coal Cleaning, Minerals Engineering, 11 (12), pp. 1191-1199
• 5. KLEIN, B., ALTUN, N.E., GHAFFARI, H., MCLEAVY, M., 2010. A hybrid flotation-gravity circuit for improved metal recovery, International Journal of Mineral Processing, 3-4, pp. 159-165.
• 6. LAMBERT, M., KLEIN, B, GREWAL, I., MCLEAVY, M., 1999. Preliminary Studies with a New Continuous Centrifugal Concentrator, Presentation at BC and Yukon CMP Annual Meeting.
• 7. MCLEAVY, M., KLEIN, B., GREWAL, I., 2001. Knelson continuous variable discharge concentrator: Analysis of Operating Variables, International Heavy Minerals Conferences, Fremantle, Australia, pp. 119-125.