Browsing by Author "Purev-Ochir Togtokhbaatar"

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    Advanced metallurgical test work on zinc ore
    (2024) Baasandorj Myagmarsuren; Dorjsundui Gombokhurts; Dashdondog Yamaaranz; Purev-Ochir Togtokhbaatar
    In these leaching investigations, sulfuric acid was employed to study the leaching rate of zinc ore, and the results were used to construct the simulative model with inverse methodology. To construct the simulative model, the prior results are used to identify the parameters and variable inter-relation with a shrinking-core model and re-expanded into column model using an interpolation with regression models. The model was tested against a column leaching to calibrate and extended to predict under different parameters for further cases. The zinc ore primarily consists of calcite, quartz, and dolomite, as determined by MLA-SEM analysis conducted in Germany. Chemical analysis revealed that the ore contains approximately 1.31% zinc, a figure confirmed by MLA-SEM. The optimal sulfuric acid concentration was found to be around 50 g L-1 , achieving a zinc recovery rate of approximately 60% within 8 hours. The maximum zinc recovery reached 72.5% at a concentration of 80 g L-1 within 64 hours. A bottle roller test was conducted to generate fundamental data for subsequent column leaching experiments. The column leaching test was carried out over a 30-day period, resulting in a zinc recovery of 19.01%. Additionally, the mathematical model predicted a recovery of 17.85% within the same timeframe, with a strong correlation of approximately 95% between the simulated and experimental results.
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    Advanced methods in processing deep-sea manganese nodules
    (2024) Purev-Ochir Togtokhbaatar; Thomas Lütke; Peter Fröhlich; Martin Bertau
    Deep Sea Manganese nodules are investigated by chemical leaching and solid-state chlorination (SSC) to explore a cheaper processing method. Mn nodules contain various essential elements of cobalt (Co), Nickel (Ni), Copper (Cu), Magnesium (Mg), and Zinc (Zn). The pulverized Mn nodule dissolved in Oxaline (1 oxalic acid + 1 choline chloride) completely within 30 min, and in Ethaline (1 Ethylene glycol + 1 choline chloride) within 72 hours. Also, diluted acids (1M H2SO4 and 1M HCl) leaching with reducing agents (H2O2 or C2H2O4) showed efficient dissolution rates. Furthermore, SSC was effective method to process Mn nodules in a presence of NH4Cl then processed nodules leached in diluted acids. Mn dissolution rate can be ordered at 300 °C (~ 50 %), 600 °C (~ 90 %) without reducing agents. Also, these leaching experiments were carried out with reducing agents and those enhanced the Mn dissolution rate by significant amounts. Finally, leaching solutions processed by the electro winning Mn and Cu are successfully deposited on the electrodes.