Investigation of the water hardness ions impact on the copper-nickel ores flotation probability

The relevance of the work is due to the need in increasing of the flotation performance accuracy forecasting to establish the influence of various factors on the process performance. The work investigated the influence of water hardness ions on the flotation probability. Estimation of the flotation probability was conducted on the basis of the floatability distribution analysis. The peculiarity of application of the given approach in work was assignment to floatability parameters values of probability of flotation of mineral particles in defined fraction. Process samples of sulphide copper-nickel ores were the object of the study. Based on the flotation kinetics results the mathematical dependences of copper, nickel and silicon cumulative recoveries in the concentrate were established and the values of flotation rate constants for flotability classes were determined. Analysis of the obtained results showed that the presence of calcium ions in the pulp decreases the maximum possible cumulative recovery of copper, nickel in the concentrate with increasing mass fraction of their non-flotable fraction in the concentrate. The highest values of contents of fast flotation fractions of copper and nickel are reached at concentration of calcium ions in pulp 27,52 mg/l. In addition in the course of flotation the height of froth layer was measured. It was found that with the increase of water hardness the value of maximum height of froth layer decreases. Decrease of probability of flotation of ore minerals is caused by decrease of foam layer stability with increase of pulp hardness.

Keywords: flotation kinetics, copper-nickel ores, flotability, fast flotation fraction, medium flotation fraction, slow flotation fraction, non-flotation fraction, flotation models, froth layer height, water hardness.
For citation:

Aleksandrova T. N., Kuznetsov V. V., Ivanov E. A. Investigation of the water hardness ions impact on the copper-nickel ores flotation probability. MIAB. Mining Inf. Anal. Bull. 2022;(6—1):263—278. [In Russ]. DOI: 10.25018/0236_1493_2022_61_0_263.


This work was supported by the Russian Science Foundation (project no. 19—17—00096).

Issue number: 6
Year: 2022
Page number: 263-278
ISBN: 0236-1493
UDK: 622.765
DOI: 10.25018/0236_1493_2022_61_0_263
Article receipt date: 14.01.2022
Date of review receipt: 30.05.2022
Date of the editorial board′s decision on the article′s publishing: 10.05.2022
About authors:

Aleksandrova T. N., Dr. Sci. (Eng.), Head of the minerals processing department, http:// 0000-0002-3069-0001, Saint Petersburg Mining University, 199106, St. Petersburg, Vasilievsky Island, 21 line 2, Russia, e-mail:; Kuznetsov V. V., postgraduate student of the minerals processing department, https://orcid. org/ 0000-0001-6159-316X, Saint Petersburg Mining University, 199106, St. Petersburg, Vasilievsky Island, 21 line 2, Russia, e-mail:;
Ivanov E. A., student of the minerals processing department, Saint Petersburg Mining University, 199106, St. Petersburg, Vasilievsky Island, 21 line 2, Russia, e-mail: s161011@


For contacts:

Kuznetsov V. V., e-mail:


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