1 / 13

Elimination of Cyanide Compounds from the Flotation Process

Elimination of Cyanide Compounds from the Flotation Process. Author: Zoran Petkovic Presenter: Ivan Rajevic PETKOM S.A. Chile. The Flotation Process. Collectors Xanthates, ditiophosphates, thionocarbamates Modifiers CaO, NaOH, Na 2 CO 3 Depressants NaCN, Na 2 SO 3 , Na 2 S 2 O 4 , ZnSO 4

tegan
Download Presentation

Elimination of Cyanide Compounds from the Flotation Process

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Elimination of Cyanide Compounds from the Flotation Process Author: Zoran Petkovic Presenter: Ivan Rajevic PETKOM S.A. Chile CTWMI 2008, Santiago, Chile

  2. The Flotation Process • CollectorsXanthates, ditiophosphates, thionocarbamates • ModifiersCaO, NaOH, Na2CO3 • DepressantsNaCN, Na2SO3, Na2S2O4, ZnSO4 • ActivatorsCuSO4, H2SO4, FeSO4 • Foaming AgentsPolyalcohols, natural oils CTWMI 2008, Santiago, Chile

  3. Use of NaCN in Flotation • In the flotation of sulfide Cu ores, as a depressant of pyrite (FeS2) • In the flotation of Pb-Zn ores, as a depressant of Zn, so that Pb can be obtained CTWMI 2008, Santiago, Chile

  4. Amount of Effluents Generated by Some Mines CTWMI 2008, Santiago, Chile

  5. How to Reduce the Environmental Impact? • Waiting for NaCN to break up in the tailings pond by exposing to UV light, or... • The best way – eliminate the contaminant! CTWMI 2008, Santiago, Chile

  6. CTWMI 2008, Santiago, Chile Case 2: Sase Pb-Zn mine, Bosnia & Herzegovina Industrial – scale testing Activator: CuSO4 Collector: K – Ethyl Xanthate,K – Amyl Xanthate Foaming agent: D-250 Depressants: NaCN, ZnSO4 Case Studies on PETKOM Reagents Case 1: Medium-size Cu mine, Chile Lab test on standard ore sample pH: 11.5 Cell type:Denver Collectors: AF-238, MC-CIPXS Foaming agents: MIBC, AF-70 Depressant: NaCN

  7. Case 1: Cu Mine, ChileStandard Ore Sample, Standard Flotation Regime CTWMI 2008, Santiago, Chile

  8. Case 1: Cu Mine, ChileStandard Ore Sample, PETKOM-40 CTWMI 2008, Santiago, Chile

  9. CTWMI 2008, Santiago, Chile Case 1: Cu Mine, ChileComparison • The quality of the concentrate after 2 min is 0,12 % better with PETKOM 40 than with NaCN (19,15% vs. 19.03 %); • The quality of the concentrate after 12 min is 0,13 % better with PETKOM 40 than with NaCN (12,0 % vs. 11,87 %); • The cumulative recovery is 0,15 % better with PETKOM 40 than with NaCN (92,93 % vs. 92,78 %); • The corrosion inhibiting properties of PETKOM were not tested.

  10. Case 2: Sase CTWMI 2008, Santiago, Chile

  11. CTWMI 2008, Santiago, Chile Case 2: SaseComparison • SKIK/PETKOM shows 4,15% better Pb recovery even when there is 1,41 % less Pb in the ore • Acceptable non – penalized content of Zn in the Pb concentrate (3,48 %) • Approximately equal content of Zn in the tails at 0,37 % less Zn in the ore.

  12. Conclusion • The SKIK/PETKOM reagent series, due to its selectivity, removes the need for NaCN or other CN salts as depressants in the flotation of pyrite Cu ores and Pb-Zn ores • SKIK/PETKOM replaces the standard collectors CTWMI 2008, Santiago, Chile

  13. Conclusion(Cont.) • Removal of cyanide compounds from flotation is a major environmental gain • Important positive financial effect • Most indicators show equal or better results compared to classic reagent regimes. CTWMI 2008, Santiago, Chile

More Related