| Abstrakt: |
The paper presents the results of developing and testing a new resource-saving technology of processing low-grade oxide and carbonate manganese ores in a jet-emulsion unit. The basic principles of creating a jet unit and the technology of processing fine manganese ores are considered. A reducing gas, which is a product of implementing the manganese reduction technology in the jet-emulsion unit, is proposed as the means of the preliminary reduction of manganese from higher-grade oxides or decomposition of carbonates as well as for removing moisture from the ore. Thus, it is proposed to close the process, that is, create a consistent flow of matter and energy passing through the main jet-emulsion unit and the preparatory unit of the fluidized bed. The main task of designing the proposed technology is to determine the consumption of crude ore in the fluidized bed unit to obtain a given yield of the intermediate product and, at the same time, ensure the possibility of completely converting higher oxides or crude ore carbonates to low oxides with the help of the reducing gas produced in the main unit. To solve this problem, an optimization task is set and implemented. The first stage is the selection of a composition and consumption of the reducing gas and determination of the consumption of the original manganese ore, which ensures the output of a preset amount of intermediate product. The second stage is the optimization of the output and composition of the gas that should ensure the reduction process in the second unit. The paper presents the results of designing the technology of processing in the jet-emulsion unit for the oxide ore of the Selezen'skoe deposit and the carbonate ore of the Usinskoe deposits. A comparative analysis of the processing of manganese ores by the proposed technology and by the technology without preliminary reduction and roasting is made. The proposed technology of processing manganese ores in a closed-cycle jet-emulsion unit allows significantly reducing the specific costs of materials, increase productivity, and significantly reduces the energy intensity of the process compared to the processing of low-grade manganese ores without preliminary reduction or roasting. [ABSTRACT FROM AUTHOR] |
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