JSC «IMiO», Kazakh National Research Technical University named after K. I. Satpayev (Almaty, Republic of Kazakhstan):

Abdulvaliev R. A., Head of Laboratory, Candidate of Engineering Sciences, rin-abd@mail.ru
Abdykirova G. Zh., Leading Researcher, Candidate of Engineering Sciences, abdgul@mail.ru
Dyusenova S. B., Leading Engineer, dusenova_s@mail.ru
Imangalieva L. M., Leading Engineer

The Donskoy Mining and Concentration Complex slime tailings concentration studies were conducted. By means of 0.2+0.071 mm slime size fraction concentration on concentrating table in open cycle, chromite concentrate with 48.8 % Cr₂O₃ mass fraction, yield being 29.42 %, was produced. Chromium oxide losses in tailings were 18.62 %, with 6.5 % Cr₂O₃ mass fraction. By means of –0.071+0 mm slime size fraction concentration on Knelson centrifugal separator in open cycle, chromite concentrate with 42.8 % Cr₂O₃ mass fraction, yield being 48.5 %, was produced. Chromium oxide losses in centrifugal separator tailings were 19.16 %, with 15.75 % Cr₂O₃ mass fraction. By means of gravity concentration circuit, total chromite concentrate, containing 43.58 % Cr₂O₃, was produced. Total concentrate yield was 37.0 %, with Cr₂O₃ recovery into concentrate — 62.45 %. Chromium total losses in tailings and in +0.2 mm size fraction will amount to 24.98 %, with its mass fraction of ~12.0 %. A technology of slime tailings activation in soda solution containing 120 g NaHCO₃ per 1 dm³, at temperature +120 °С and duration of 60 min, prior to gravity concentration, resulting in slime phase composition change, has been developed. Slimes concentration on concentrating table and centrifugal separator, following preliminary activation in soda solution, permitted to produce joined salable concentrate with 51.3 % Cr₂O₃ mass fraction, which is 8.42 % higher, if compared to processing without activation.

1. Mamyrbaev A. A. Toxicology of chromium and its compounds. Aktobe, 2012. 284 p.
2. Ibraev I. I., Ibraeva O. T., Suyundinov M. M. Utilization of chrome-containing sludges. Metallurgist. 2012. No. 10. pp. 28–30.
3. Bazarbaeva S. M., Yermagambetova Zh. S. Distribution of chromium and boron in components of the environment in Aktobe. Vestnik of Aktobe’s K. Zhubanov Regional State University. 2015. No 4. pp. 32–35.
4. Savchenkova N. M. Beneficiation of chromite ores abroad. Moscow: Chermetinformatsiya, 1972. 32 p.
5. Akar Sen G. Application of full factorial experimental design and response surface methodology for chromite beneficiation by Knelson concentrator. Minerals. 2016. Vol. 6, Iss. 1. p. 5. DOI: 10.3390/min6010005.
6. Kumar C. R., Tripathy S. K., Rao D. S. Characterisation and pre-concentration of chromite values from plant tailings using floatex density separator. J. Miner. Mater. Charact. Eng. 2009. Vol. 8, Iss. 5. pp. 367–378.
7. Tripathy S. K., Ramamurthy Y., Singh V. Recovery of chromite values from plant tailings by gravity concentration. J. Miner. Mater. Charact. Eng. 2011. Vol. 10, Iss. 1. pp. 13–25.
8. Knelson B., Jones R. A new generation of Knelson concentrators a totally secure system goes on line. Miner. Eng. 1993. Vol. 2/3, No. 7. pp. 201–207.
9. Gallios G. P., Deliyanni E. A., Pelek E. N., Matis K. A. Flotation of chromite and serpentine. Sep. Purif. Technol. 2007. Vol. 55, Iss. 2. pp. 232–237. DOI: 10.1016/j. seppur.2006.12.015.
10. Aslan N., Kaya H. Beneficiation of chromite concentration waste by multi-gravity separator and high intensity induced-roll magnetic separator. Arab. J. Sci. Eng. 2009. Vol. 34, Iss. 2B. pp. 285–297.
11. Tripathy S. K., Banerjee P. K., Suresh N. Magnetic separation studies on ferruginous chromite fine to enhance
Cr : Fe ratio. Int. J. Miner. Metall. Mater. 2015. Vol. 22, Iss. 3. pp. 217–224.
12. Pat. 32333 Republic of Kazakhstan.