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Anatolyevich S.S.,NIPKB Stroitehnika CJSC | Mikhaylovich V.G.,NIPKB Stroitehnika CJSC | Stanislavovich S.V.,NIPKB Stroitehnika CJSC | Danilovich S.A.,Interstroyproekt
Obogashchenie Rud | Year: 2013

The process of drying and dedusting of crushed ballast screenings should remove finely dispersed impurities by vibration airflow-driven techniques in an aerated vibration fluidized bed plant (AVFB). One of the main technical parameters of AVFB plants is their throughput capacity, which directly depends on the flow rate of the material being processed on the vibrating load-carrying grate. To determine the flow rate, equations of dynamics of vibration-induced motion of the aerated layer of loose material on the gas-permeable bottom plate were used. Based on the above equation solutions an algorithm and a special software tool («Vibra») were developed to compute the principal parameters of dynamics of the vibration-induced motion of the material layer on the bottom plate of the vibrating device, including calculated flow rate of the aerated layer vibration-induced movement of material. For final adjustments of the software tool, experiments were performed on a special bench representing a horizontal vibrating chute with two bottom plates, the upper one being a flat perforated grate. On the basis of the results, numerical values of ratios were determined to describe deformation susceptibility of the sand layer in the process of its movement with the bottom plate of the vibrating screen, a margin of error was also estimated for the software modeling of motion parameters versus the experimentally identified parameters of physical sand movement. The margin of error does not exceed 10 %, and is admissible for «Vibra» software applications in engineering design and selection of modes of operation for AVFB plants, as well as in determining their flow rate capacity.

Bortnikov A.V.,Interstroyproekt | Samukov A.D.,Interstroyproekt | Shuloyakov A.D.,Interstroyproekt | Baranov V.F.,Mekhanobr Engineering
Obogashchenie Rud | Year: 2015

The paper presents a method for development of a mathematic economic model for assessment of profitability of alternative technologies for dispersed rock material waste recycling with a view to produce mixture, suitable for mineral cotton production. Mathematic economic modeling is used for determination of a most promising waste processing flow sheet producing mixture in question, choosing from the four technologically viable alternative flow sheets. With that, most cost effective options of each of the four flow sheets are specified, providing for application of different binding materials (bentonite or cement) with varying throughput rate of processing installation with respect to final product (1.0, 2.5, 12 t/hr), with two ratios of granite / dolomite - 70 : 25 and 75 : 20. Modeling algorithm of the main optimization criterion - quantity of net present value (NPV) - is developed in Excel. On the basis of the obtained data, a calculation algorithm is synthesized for economic criterion computation in connection with changes in main parameters at input to the mathematic economic model. With that, operating costs are calculated in a preset range of selected parameters, net present value (NPV) is determined for an assumed planning horizon with consideration of discounting. A comparative analysis of product costing results showed that only 6 mixture preparation technologies out of 24 under consideration proved to be commercially viable. From those 6 technologies an optimal one was determined through modeling, distinguished by a most efficient combination of existing processing parameters. With respect to this optimal alternative, NPV amounted to 25.3 million rubles, discounted pay-back period for capital investment recoupment being 2.8 years.

Bortnikov A.V.,Interstroyproekt | Samukov A.D.,Interstroyproekt | Spiridonov P.A.,Interstroyproekt | Shuloyakov A.D.,Interstroyproekt
Obogashchenie Rud | Year: 2015

The paper reports the results of the experimental and theoretical studies, validating feasibility of mix preparation for mineral cotton production from mixture of granitic and dolomitic rocks processing waste materials in a certain ratio (75-70 %: 20-25 %), with addition of 5 % binding agents. On the basis of the obtained results, a technology was developed for working the above materials, including size reduction of all mix components to fine-dispersed (-0.315 mm), their dosing in a certain ratio, mixing, granulation, sizing and, if required, drying with output of granulated mix of 5-20 mm size, suitable for mineral cotton production. Four possible alternative mix preparation flow sheets have been developed. The main difference with these flow sheets consists in utilization of carbonate rocks processing waste materials of different sizes. The second principal difference is the technique used for preparation of granules. A most preferable alternative flow sheet for commercial implementation will be determined through further investigations by means of comparative technical and economic calculations to assess cost effectiveness of mix preparation process at well-grounded different production rates with application of corresponding equipment.

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