The hydrophilic particles in washing products of trough pneumo-mechanical flotation machine
Lenartowicz M., Sablik J.

S u m m a r y
The attendance of hydrophilic particles in products obtained from sampling trough pneumo – mechanical flotation machine washing power coal and coking coal has been investigated. The film flotation method and empiric relationship between contact angle and surface tension of wetting of coal has been used in order to appoint a percentage content of hydrophilic particles. It has been found that particles of coal flotating in the first order have the lowest surface tension of wetting and the lowest energetic nonhomogeneity and slight number of hydrophilic particles possess surface tension of wetting equal or higher than the surface tension of the zero contact angle (=0), probably on a mechanical curry (uplift) basis. What is more, the investigation shows that higher number of hydrophilic particles pass into the concentrate products in case of power coal (6,5; 16,5; 20%) than in case of coking coal (3; 5; 19%).To sum up, the analysis of the distribution of hydrophilic particles and surface tension of wetting in flotation products obtained in industrial IZ type flotation machine can be used for evaluation of the technology of flotation and the work performance of this machine.