Sibekotekhnika Science and Production Enterprise, Novokuznetsk, Russia:

V. I. Murko, Director for Science, Professor, Doctor of Engineering Sciences, sib_eco@kuz.ru
G. D. Vakhrusheva, Researcher
D. A. Chernykh, Researcher

Siberian State Industrial University, Novokuznetsk, Russia:
V. O. Shekhovtseva, Senior Lecturer

In view of the growing demand in the economic sector, including mining and coal-fired power generation, and for the purpose of diminishing accumulations of ore concentration rejects and ash-and-slag waste at heat power plants and iron-and-steel works, the authors present the original design of a new energy-saving high-production milling machine and its experimental test results. The machine design and the milling flow diagram are described. The designed milling machine enables more efficient wet milling at lower energy consumption as compared with the known vertical and horizontal vibro mills owing to utilization of entire volume of milling cell, bottom-up vertical flow of milled material in the outer cavity of the cell under hydraulic head and due to decrease in the milled material flow velocity on transition from one cavity to the other. The article reports data on fine milling of ash-and-slag waste of power generation plants and coal slag (the latter — for production of coal–water slurry fuel — CWSF). As an illustration, graphoanalytical distribution of particles with respect to a minimum before and after milling of ash-andslag waste is shown with validation of the final product being a fine milled product similar to cement in terms of the grinding coarseness. In this connection, the milled ash-and-slag waste is recommended to be included in the mix of binding agents in solidifying backfill. In this case, cement consumption is reduced more than by 30% as compared with the conventional technology. The milling machine is advised for the use in preparation of backfill mixtures (to avoid or considerably reduce expensive cement consumption) and in production of CWSF which will allow using sulfur absorption agents to reduce sulfur oxide emission in fuel combustion at power generation plants and boiler-houses.
The study was carried out under financial support from the RF Ministry of Education and Science within the framework of the federal targeted program on R&D in Priority Areas of Advancement of the Russian Science and Technology for 2014–2020, Agreement No. 14.583.21.0004 as of July 16, 2014. Unique Project Identifier RFMEF158314X0004.
The authors appreciate participation of V. I. Karpenok, T. M. Pavlova and L. A. Smerdov, Sibekotekhnika Science and Production Enterprise, in this research.

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