Experimental justification of cyanoethyl dithiocarbamate usability toward enhanced copper and silver recovery from old waste at Solnechny GOK

Old waste of high-grade complex ore processing is a critical source of valuable mineral components. The reserves of base and noble metals accumulated in waste storages can often increase the content of these metals in low-grade ore meant or scheduled for recycling. In the meanwhile, oxidation, fine dissemination and metamorphic surface of minerals bearing target metals are the objective difficulties for the conventional technologies to be efficient. Development and application of new selective agents of directed action can ensure conditions for the enhanced recovery of base and noble metals from the mentioned type of raw materials. The effectiveness analysis of a new agent from the class of dithiocarbamates—S-cyanoethyl N,N-diethyl dithiocarbamate (CEDETC) demonstrates feasibility of enhanced recovery of copper and silver sulfides from old waste at Solnechny GOK. The analytical scanning electron and laser microscopy techniques proved the agent adsorption at mineral surface with formation of a stable hydrophobic compound with copper, which stimulated the hydrophobic behavior and flotation activity of minerals better as against the use of butyl xanthate. In flotation of old waste at Solnechny GOK, the new agent CEDETC, both in replacement of some xanthate and in case of extra consumption, ensures the increase in the copper and silver recovery by 7–9% and 3–4%, respectively, in the rough copper concentrate at the reduced yield of arsenic by 2–3%.

Matveeva T. N., Gromova N. K., Lantsova L. B., Gladysheva O. I. Experimental justification of cyanoethyl dithiocarbamate usability toward enhanced copper and silver recovery from old waste at Solnechny GOK. MIAB. Mining Inf. Anal. Bull. 2023;(1):119-129. [In Russ]. DOI: 10.25018/0236_1493_2023_1_0_119.

The study was supported by the Russian Science Foundation, Grant No. 22-17-00149, https://rscf.ru/project/22-17-00149/.

T.N. Matveeva¹, Dr. Sci. (Eng.), Deputy Director for Scientific Work, Head of Department, e-mail: tmatveyeva@mail.ru, ORCID ID: 0000-0002-5658-9948,
N.K. Gromova¹, Researcher, e-mail: gromova_nk@mail.ru, ORCID ID: 0000-0002-4753-5745,
L.B. Lantsova¹, Researcher, e-mail: lblancova@yandex.ru,
O.I. Gladysheva¹, Graduate Student, e-mail: gladysheva.olga2022@bk.ru,
¹ Institute of Problems of Comprehensive Exploitation of Mineral Resources of Russian Academy of Sciences, 111020, Moscow, Russia.

N.K. Gromova, e-mail: gromova_nk@mail.ru.

1. Panshin A. M., Mamyachenkov S. V., Tropnikov D. L., Anisimova O. S., Rogozhnikov D. A. Research of regularities of leaching the sulfated cinders obtained during roasting of copper-zinc middlings. Izvestiya Vuzov. Tsvetnaya Metallurgiya. 2017, no. 3, pp. 23—30. [In Russ].

2. Khanchuk А. I., Kemkina R. А., Kemkin I. V., Zvereva V. P. Mineralogical and geochemical substantiation for processing aged sands from tailing dumps of the Solnechny mining and processing plant (Komsomolsky district, the Khabarovsk territory). Bulletin of Kamchatka regional association «Educational-Scientific centre». Earth sciences. 2012, no. 1(19), pp. 22—40. [In Russ].

3. Zvereva V. P., Frolov K. R., Lysenko A. I. Chemical reactions and conditions of mineral formation at tailings storage facilities of the Russian Far East. Mining Science and Technology (Russia). 2021, vol. 6, no. 3, pp. 181—191. DOI: 10.17073/2500-0632-2021-3-181-191.

4. Aleksandrova T. N., Orlova A. V., Taranov V. A. Enhancement of copper concentration efficiency in complex ore processing by the reagent regime variation. Fiziko-tekhnicheskiye problemy razrabotki poleznykh iskopayemykh. 2020, no. 6, pp. 116—124. [In Russ].

5. Bragin V. I., Burdakova E. A., Kondrat’eva A. A., Plotnikova A. A., Baksheeva I. I. Dressability of old gold-bearing tailings by flotation. Fiziko-tekhnicheskiye problemy razrabotki poleznykh iskopayemykh. 2018, no. 4, pp. 152—160. [In Russ].

6. Chernousenko E. V., Alekseeva S. A., Rukhlenko E. D., Mitrofanova G. V. Prospects for feasibility of processing of refractory copper–nickel ores and waste stockpiles. Gornyi Zhurnal. 2020, no. 3, pp. 45—50. [In Russ]. DOI: 10.17580/gzh.2020.03.08.

7. Ignatkina V. A., Bocharov V. A., Makavetskas A. R., Kayumov A. A., Aksenova D. D., Khachatryan L. S., Fishchenko Y. Y. Rational processing of refractory copper-bearing ores. Russian Journal of Non-Ferrous Metals. 2018, vol. 59, no. 4, pp. 364—373.

8. Ryaboy V. I., Shepeta E. D. Collector for copper-arsenic ore flotation. Mining Science and Technology (Russia). 2020, vol. 5, no. 4, pp. 297—306. [In Russ]. DOI: 10.17073/2500-0632-2020-4-297-306.

9. Mitrofanova G. V., Chernousenko E. V., Bazarova E. A., Tyukin A. P. The search for new complexing reagents for copper-nickel ore flotation. Tsvetnye Metally. 2019, no. 11, pp. 27—33. [In Russ]. DOI: 10.17580/tsm.2019.11.02.

10. Zharolla N. D., Yergeshev A. R., Ignatkina V. A. Estimation of selectivity of sulfhydryl collectors on a dithiophosphate basis. MIAB. Mining Inf. Anal. Bull. 2020, no. 11, pp. 14—26. [In Russ]. DOI: 10.25018/0236-1493-2020-11-0-14-26.

11. Agheli S., Hassanzadeh A., Hassas B. V., Hasanzadeh M. Effect of pyrite content of feed and configuration of locked particles on rougher flotation of copper in low and high pyritic ore types. International Journal of Mining Science and Technology. 2018, vol. 23, no. 2, pp. 167—176.

12. Lin Q., Gu G., Wang H. Recovery of molybdenum and copper from porphyry ore via isoflotability flotation. Transactions Nonferrous Metals Society of China. 2017, vol. 27, no. 10, pp. 2260—2271.

13. Ramesh B., Venkatesh P., Jabbar A. A. Influence of dithiocarbamate on metal complex and thin film depositions. International Journal of Innovative Research in Science Engineering and Technology. 2014, vol. 3, no. 8, pp. 15301—15309. DOI: 10.15680/ijirset.2014.0308033.

14. Ly N., Nguyen T., Zoh K.-D., Joo S.-W. Interaction between diethyldithiocarbamate and Cu(II) on gold in non-cyanide wastewater. Sensors. 2017, vol. 17, no. 11, pp. 1—12.

15. Xiao J., Liu G., Zhong H., Huang Y., Cao Z. The flotation behavior and adsorption mechanism of O-isopropyl-S-[2-(hydroxyimino)propyl] dithiocarbonate ester to chalcopyrite. Journal of the Taiwan Institute of Chemical Engineers. 2017, vol. 71, pp. 38—46. DOI: 10.1016/j. jtice.2016.12.022.

16. Matveeva T. N., Ivanova T. A., Getman V. V., Gromova N. K. Novel flotation reagents to recover micro and nanoparticles of noble metals from rebellious ore. Gornyi Zhurnal. 2019, no. 11, pp. 89—93. [In Russ].

17. Matveeva T. N., Lantsova L. B., Gladysheva O. I. Effect of ore dressing on the flotation of copper and arsenic minerals in sulfide ore processing. Russian Mining Industry Journal. 2021, no. 6, pp. 48—50. [In Russ].

18. Matveeva T. N., Gromova N. K., Lantsova L. B. Experimental proof of applicability of cyclic and aliphatic dithiocarbamate collectors in gold-bearing sulphide recovery from complex ore. Fiziko-tekhnicheskiye problemy razrabotki poleznykh iskopayemykh. 2021, no. 1, pp. 137—145. [In Russ].

19. Matveeva T. N. Flotation reagents for finely disseminated gold extraction from unenriched ores and technogenic products. Sustainable Development of Mountain Territories. 2021, vol. 13, no. 2, pp. 201—207. [In Russ].

20. Byr'ko V. M. Ditiokarbamaty [Dithiocarbamates], Moscow, Nauka, 1984, 341 p.

21. Glinkin V. A. Issledovanie i razrabotka protsessa selektivnoj flotatsii polimetallicheskikh serebrosoderzhashchikh rud s primeneniem dimetilditiokarbamata natriya [Study and development of selective flotation of polymetallic silver-bearing ore using sodium dimethyl dithiocarbamate], Candidate’s thesis, Moscow, Gintsvetmet, 2004, 26 p.

22. Glinkin V. A., Ivanova T. A., Shikhkerimov P. G. Synthesis and study of the flotation effect of DECE. Tsvetnaya Metallurgiya. 1989, no. 1, pp. 14—15. [In Russ].