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The Use of Falcon Concentrator to Determine the Gravity Recoverable Gold (GRG) Content in Gold Ores

Onel O., Tanriverdi M.

Inżynieria Mineralna

2016

R. 17, nr 1

189--194

This study presents the results of the application of the laboratory gravity-recoverable-gold (GRG) determination procedure on a Turkish gold ore using a Falcon concentrator. The study had two major goals; as investigating the compatibility of Falcon concentrator for GRG procedure (which was originally developed for Knelson concentrator); and finding out the gravity recoverable gold content in Gümüşhane/Mastra gold ore. It was seen that a concentrate enriched in Au content could be successfully achieved: After the first stage a product with an Au grade of 41.09 mgAu/tonne at %10.95 fractional gold recovery at the first stage of the procedure. Au content in the concentrate increased to 98.84 mg after the second stage and finally 59.74 mg Au was obtained by the third stage. As a result of the application, it was found that the GRG content of Gümüşhane/Mastra gold was 48.28%, corresponding to a significant potential for obtaining an Au-enriched preconcentrate.

Artykuł przedstawia wyniki zastosowania procedury laboratoryjnego testu GRG (wzbogacania grawitacyjnego) dla tureckich rud złota za pomocą wzbogacalnika typu Falcon. Badania miały dwa główne cele: zbadanie przydatności wzbogacalnika typu Falcon do testu GRG (który został opracowany oryginalnie dla wzbogacalnika typu Knelson) oraz określenie zawartości złota w produkcie ze wzbogacania grawitacyjnego dla rudy złota ze złoża Gümüşhane/Mastra. Stwierdzono, że produkt o dużej zawartości Au może zostać osiągnięty. Po pierwszym etapie otrzymano produkt o zawartości Au równej 41,09 mg przy uzysku frakcjonowanym złota równym 10,95% przy pierwszym stadium testu. Zawartość Au w koncentracie wzrosła do 98,84 mg po drugim etapie a finalnie otrzymano zawartość Au równą 59,74 mg po etapie trzecim. W wyniku zastosowania eksperymentu stwierdzono, że zawartość GRG złota ze złoża Gümüşhane/Mastra wyniosła 48,28% a ponadto stwierdzono wysoki potencjał do otrzymania wstępnych koncentratów bogatych w Au.

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

Altun N. E., Sakuhuni G., Klein B.

Physicochemical Problems of Mineral Processing

2015

Vol. 51, iss. 1

115--126

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.