Federal State Budget Research Institution Mining Institute of the North, Siberian Branch, Russian Academy of Sciences, Yakutsk, Republic of Sakha, Russia:
I. A. Matveev, Junior Researcher of Laboratory of Mineral Processing, e-mail: igor.andr.matveev@gmail.com
V. E. Filippov, Senior Researcher of Laboratory of Mineral Processing, e-mail: filippovve@mail.ru
A. I. Matveev, Head of Laboratory of Mineral Processing
N. G. Eremeeva, Researcher of Laboratory of Mineral Processing

Results of experimental data are shown on the study of free falling of mineral particles in water environment. Hydraulic coarseness of particles with identical density depends only on their thickness. All other parameters of particles have almost no influence on their immersion speed in liquid. Loosening (side motions) of flattened particles at their immersion in liquids takes place because of the difference of speeds and orientation of streams along overhead and lower surfaces of particle. There is offered the method of measurement of hydraulic grain size of fine flattened particles of gold which is difficult to catch with naked eye during their immersion in water. Experiments were carried out on the study of peculiarities of particle form influence on their movement on inclined pipe. Measurement of particle immersion speed on sloping surface made a conclusion: planning of upgrader particles of flattened form of gold or platinum needs the creation of such terms when useful mineral particles would be oriented by the long side along a stream. As the water velocity along the curved pipe in the form of a circle segment, flattened particles form upon reaching a certain angle of inclination is their failure — instant removal from the tube. At the same time, they are oriented to the failure of its long axis along the stream, and at the time of failure dramatically unfold its greatest area across the flow. On the particle breakdown with a reorientation of its shape in the flow, velocity profile also affects the layer height due to friction with the water pipes bottom, i. e. flow with slow motion. Terms reorientation of the particles entrained in the water flow in a curved pipe, subject to physical laws and depend on the angle of the surface. On the basis of the obtained data there was set the physical model of the moment of particle breakdown.
This work was carried out with the support of the grant of the Russian Foundation for Basic Research No. 15-45-05078/16.

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