Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia:

Kondratyev S. A., Doctor of Engineering Sciences, Head of Complex Mineral Mining and Processing Department, kondr@misd.nsc.ru
Semyanova D. V., Postgraduate, Complex Mineral Mining and Processing Department

The collective ability of desorbed species (DS species) of saturated carboxylic acids is reviewed. DS species of a reagent denote the forms capable of moving from the mineral surface to the bubble, i.e., to the gas-liquid interface, at the moment of breakout of the interlayer separating these interconnected objects. Experiments on fluorite ore in the presence of mixed cover, including physical and chemical sorption forms, and cover containing only chemical form are performed. As is shown, the removal of physical sorption form decreases recovery of fluorite in concentrate. It was determined, that physical sorption form of carboxylic acid provides specific collective function. The spreading rate of carboxylic acids on water surface is determined at pH 7 and 10. The spreading rate of carboxylic acids is comparable with flotation parameters of fluorite ore with mentioned collectors. The sequence of increasing the spreading rate of middle- and long chain carboxylic acids corresponds with the sequence of increasing fluorite recovery in foam product. A criterion for estimating the collective capacity of carboxylic acids is proposed. Advisability of its application for selection flotation reagent with required collective ability is estimated. Values of forces that influence the liquid in the interlayer at the side of the spreading film of the reagent DS species and the water flow rate from the interlayer are evaluated.

This study was financed by RSF grant No. 15-17-10017.

1. Kulkarni R. D., Somasundaran P. Kinetics of oleate adsorption at the liquid/air interface and its role in hematite flotation. AIChE, Symposium series. 1975. Vol. 71. pp. 124–133.
2. Kulkarni R. D., Somasundaran P. Flotation chemistry of hematite/oleat system. Colloids and Surfaces. 1980. Vol. 1. pp. 387–405.
3. Quast K. Flotation of hematite using C6–C18 saturated fatty acids. Minerals Engineering. 2006. Vol. 19. pp. 582–597.
4. Yu F., Wang Y., Zhang L., Zhu G. Role of oleic acids ionicmolecularcomplex in the flotation of spodumene. Mineral Engineering. 2015. Vol. 71. pp. 7–12.
5. Bleier A., Goddard E. D., Kulkarni R. D. Adsorption and critical flotation conditions. Journal of Colloid and Interface Science. 1977. Vol. 59. pp. 490–504.
6. Finch J. A., Smith G. W. Dynamic superficial tension of alkaline dodecylamine solutions. Journal of Colloid and Interface Science. 1973. Vol. 45. pp. 81–91.
7. Zhivankov G. V., Ryaboy V. I., Collective properties and surface activity of higher air floats. Obogashchenie rud. 1985. No. 3. pp. 13–6.
8. Ryaboy V. I., Shepeta E. D., Kretov V. P., Levkovets S. E. Effect of surface – active properties of reagents with sodium dialkyldithiophosphates upon flotation of sulfides. Obogashchenie rud. 2015. Vol. 2. pp. 18–22. DOI : 10.17580/or.2015.02.04
9. Somasundaran P. The relationship between adsorption at different interfaces and flotation behavior. Transactions of the Society of Mining Engineers of AIME. 1968. Vol. 241. pp. 105–109.
10. Somasundaran P., Fuerstenau D. W. On incipient flotation conditions. Transactions of the Society of Mining Engineers of AIME. 1968. Vol. 241. pp. 102–104.
11. Kondratyev S. A., Ryaboy V. I. Dithiophosphates collecting ability estimation and its relationship to selectivity of valuable component recovery. Obogashchenie rud. 2015. Vol. 3. pp. 25–31. DOI : 10.17580/or.2015.03.04
12. Kondratyev S. A., Moshkin N. P., Konovalov I. A. Collecting ability of easily desorbed xanthates. Journal of Mining Science. 2015. Vol. 51. pp. 830–838.
13. Kondratyev S. A., Moshkin N. P. Estimate of collecting force of flotation reagent. Journal of Mining Science. 2015. Vol. 51. pp. 150–156.
14. Ryaboy V. I., Shepeta E. D. Dialkyldithiophosphatessurface activity and hydrophobic properties effect upon copper arsenic–containing ores flotation. Obogashchenie rud. 2016. Vol. 4. pp. 29–34.
15. Sivamohan R., de Donato P., Cases J. M. Adsorption of oleate species at the fluorite-aqueous solution interface. Langmuir. 1990. Vol. 6. pp. 637–644.
16. Mielczarski J. A., Cases J. M., Bouquet E., Barres O., Delon J. F. Nature and structure of adsorption layer on apatite contacted with oleate solutions 1. Adsorption and Fourier transform infrared reflection studies. Langmuir. 1993. Vol. 9. pp. 2370–2382.
17. Hu J. S., Misra M., Miller J. D. Effect of temperature and oxygen on oleate adsorption by fluorite. International Journal of Mineral Processing. 1986. Vol. 18. pp. 57–72.
18. Bogdanov O. S., Mikhailova N. S. Effect of crystal of dry iron oxides on their floatability. Obogashchenie rud. 1966. Vol. 4. pp. 19–23.
19. Polkin S. I. Processing of Ores and Rare and Noble Metals. Moscow : Nedra, 1987. pp. 428.
20. Rath S. S., Sinha N., Sahoo H., Das B., Mishra B. K. Molecular modeling studies of oleate adsorption on iron oxides. Applied Surface Science. 2014. Vol. 295. pp. 115–122.
21. Yang X., Ai G. Effects of surface electrical property and solution chemistry on fine wolframite flotation. Separation and Purification Technology. 2016. Vol. pp. 272–279
22. Quast K. Use of conditioning time to investigate the mechanisms of interactions of selected fattyacids on hematite. Part 1: Literature survey. Minerals Engineering. 2015. Vol. 79. pp. 295–300.
23. Abramov A. A. Method for quantitative determination of the sorption forms of solvents on mineral surfaces. Fizikotekhnicheskie problemy razrabotki poleznykh iskopaemykh. 1968. No. 4. pp. 384–389.
24. Levich V. G. Physicochemical Hydrodynamics, 2nd Ed., Englewood Cliffs, New Jersey: Prentice-Hall, 1962, p. 700.