Larsen, E., Kowalczuk, P.B., Kleiv, R.A. Non-HF collectorless flotation of quartz (2019) Minerals Engineering, 133, pp. 115-118.

Kowalczuk, P.B., Hahn, K.M., Lennartz, J., Snook, B., Wotruba, H., Aasly, K., Kleiv, R.A. Application of X-ray transmission sensor-based sorting for preconcentration of seafloor massive sulphide rock samples from the Loki's Castle area at the Arctic mid-ocean Ridge (2019) IMPC 2018 - 29th International Mineral Processing Congress, pp. 672-682.

Kosior, D., Kowalczuk, P.B., Zawala, J. Surface roughness in bubble attachment and flotation of highly hydrophobic solids in presence of frother - experiment and simulations (2018) Physicochemical Problems of Mineral Processing, 54 (1), pp. 63-72.

Kowalczuk, P.B., Snook, B., Kleiv, R.A., Aasly, K. Efficient extraction of copper and zinc from seafloor massive sulphide rock samples from the Loki's Castle area at the Arctic Mid-Ocean Ridge (2018) Minerals Engineering, 115, pp. 106-116.

Kowalczuk, P.B., Zawala, J., Drzymala, J. Concentration at the minimum bubble velocity (CMV) for various types of flotation frothers (2017) Minerals, 7 (7), art. no. 118, .

Kowalczuk, P.B., Siedlarz, M., Szczerkowska, S., Wojcik, M. Facile determination of foamability index of non-ionic and cationic frothers and its effect on flotation of quartz (2017) Separation Science and Technology (Philadelphia), pp. 1-9. Article in Press.

Kowalczuk, P.B., Drzymala, J. Selectivity and power of frothers in copper ore flotation (2017) Physicochemical Problems of Mineral Processing, 53 (1), pp. 515-523.

Drzymala, J., Ratajczak, T., Kowalczuk, P.B. Kinetic separation curves based on process rate considerations (2017) Physicochemical Problems of Mineral Processing, 53 (2), pp. 983-995.

Kowalczuk, P.B., Akkaya, C., Ergun, M., Janicki, M.J., Sahbaz, O., Drzymala, J. Water contact angle on corresponding surfaces of freshly fractured fluorite, calcite and mica (2017) Physicochemical Problems of Mineral Processing, 53 (1), pp. 192-201.

Kowalczuk, P.B., Drzymala, J. Physical meaning of the Sauter mean diameter of spherical particulate matter (2016) Particulate Science and Technology, 34 (6), pp. 645-647.

Kowalczuk, P.B., Zawala, J., Drzymala, J., Malysa, K. Influence of hexylamine on kinetics of flotation and bubble attachment to the quartz surface (2016) Separation Science and Technology (Philadelphia), 51 (15-16), pp. 2681-2690.

Kowalczuk, P.B., Zawala, J. A relationship between time of three-phase contact formation and flotation kinetics of naturally hydrophobic solids (2016) Colloids and Surfaces A: Physicochemical and Engineering Aspects, 506, pp. 371-377.

Ratajczak, T., Drzymala, J., Kowalczuk, P.B. Local and global assessment of flotation kinetics (2016) E3S Web of Conferences, 8, art. no. 01033, .

Pazik, P.M., Chmielewski, T., Glass, H.J., Kowalczuk, P.B. World production and possible recovery of cobalt from the Kupferschiefer stratiform copper ore (2016) E3S Web of Conferences, 8, art. no. 01063, .

Drzymala, J., Swebodzinska, A., Duchnowska, M., Bakalarz, A., Luszczkiewicz, A., Kowalczuk, P.B. Preliminary study on collectorless flotation of chalcocite, bornite and copper-bearing shale in the presence of selected frothers (2016) E3S Web of Conferences, 8, art. no. 01031, .

Kowalczuk, P.B., Zawala, J., Kosior, D., Drzymala, J., Malysa, K. Three-Phase Contact Formation and Flotation of Highly Hydrophobic Polytetrafluoroethylene in the Presence of Increased Dose of Frothers (2016) Industrial and Engineering Chemistry Research, 55 (3), pp. 839-843.

Kowalczuk, P.B., Drzymala, J. Some remarks on attachment of a gas bubble to another phase both immersed in water (2016) Physicochemical Problems of Mineral Processing, 52 (1), pp. 147-154.

Janicki, M.J., Drzymala, J., Kowalczuk, P.B. Structure and surface energy of both fluorite halves after cleaving along selected crystallographic planes (2016) Physicochemical Problems of Mineral Processing, 52 (1), pp. 451-458.

Iyakwari, S., Glass, H.J., Rollinson, G.K., Kowalczuk, P.B. Application of near infrared sensors to preconcentration of hydrothermally-formed copper ore (2016) Minerals Engineering, 85, pp. 148-167.

Kowalczuk, P.B. Flotation and hydrophobicity of quartz in the presence of hexylamine (2015) International Journal of Mineral Processing, 140, pp. 66-71.

Kowalczuk, P.B., Zaleska, E., Danczak, O. Flotation of carbonaceous copper shale-quartz mixture with poly(ethylene glycol) alkyl ethers (2015) Transactions of Nonferrous Metals Society of China (English Edition), 25 (1), pp. 314-318.

Kowalczuk, P.B., Mroczko, D., Drzymala, J. Influence of frother type and dose on collectorless flotation of copper-bearing shale in a flotation column (2015) Physicochemical Problems of Mineral Processing, 51 (2), pp. 547-558.

Tasdemir, A., Kowalczuk, P.B. Application of statistical process control for proper processing of the fore-sudetic monocline copper ore (2014) Physicochemical Problems of Mineral Processing, 50 (1), pp. 249-264.

Kowalczuk, P.B., Buluc, B., Sahbaz, O., Drzymala, J. In search of an efficient frother for pre-flotation of carbonaceous shale from the Kupferschiefer stratiform copper ore (2014) Physicochemical Problems of Mineral Processing, 50 (2), pp. 835-840.

Kowalczuk, P.B. Determination of critical coalescence concentration and bubble size for surfactants used as flotation frothers (2013) Industrial and Engineering Chemistry Research, 52 (33), pp. 11752-11757.

Iyakwari, S., Glass, H.J., Kowalczuk, P.B. Potential for near infrared sensor-based sorting of hydrothermally-formed minerals (2013) Journal of Near Infrared Spectroscopy, 21 (3), pp. 223-229.

Drzymala, J., Kowalczuk, P.B., Oteng-Peprah, M., Foszcz, D., Muszer, A., Henc, T., Luszczkiewicz, A. Application of the grade-recovery curve in the batch flotation of Polish copper ore (2013) Minerals Engineering, 49, pp. 17-23.

Drzymala, J., Kowalczuk, P.B., Foszcz, D., Muszer, A., Henc, T., Luszczkiewicz, A. Analysis of separation results by means of the grade-recovery halbich upgrading curve (2012) 26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth - Conference Proceedings, pp. 1239-1249.

Kowalczuk, P.B., Drzymala, J. Letter to the Editor, "detachment of coarse particles from oscillating bubbles-The effect of particle contact angle and medium viscosity" by D. Xu, I. Ametov and S.R. Grano (Int. J. Miner. Process. 101, 50-57, doi:10.1016/jminpro.2011.07.03) (2012) International Journal of Mineral Processing, 104-105, pp. 80-81.

Kowalczuk, P.B., Drzymala, J. Surface flotation of particles on liquids. Principles and applications (2012) Colloids and Surfaces A: Physicochemical and Engineering Aspects, 393, pp. 81-85.

Kowalczuk, P.B., Drzymala, J. A proposition of symbolism of non-ideal separations followed by analytical procedures for description of separation processes (2011) Mineral Processing and Extractive Metallurgy Review, 32 (4), pp. 278-288.

Kowalczuk, P.B., Sahbaz, O., Drzymala, J. Maximum size of floating particles in different flotation cells (2011) Minerals Engineering, 24 (8), pp. 766-771.

Kowalczuk, P.B., Drzymala, J. Contact angle of bubble with an immersed-in-water particle of different materials (2011) Industrial and Engineering Chemistry Research, 50 (7), pp. 4207-4211.

Watanabe, M., Kowalczuk, P.B., Drzymala, J. Analytical solution of equation relating maximum size of floating particle and its hydrophobicity [Analityczne rozwia{ogonek}zanie równania wia{ogonek}ża{ogonek}cego maksymalny rozmiar flotuja{ogonek}cego ziarna i jego hydrofobowość] (2011) Physicochemical Problems of Mineral Processing, 46, pp. 13-20.

Kowalczuk, P.B., Chmielewski, T. Changes of electrode potential in the non-oxidative leaching [Zmiany potencjal{stroke}u elektrod podczas l{stroke}ugowania nieutleniaja{ogonek}cego] (2010) Physicochemical Problems of Mineral Processing, 44, pp. 115-126.