| Abstract: | In this experiment, low manganese high iron ore with manganese grade of 27.7% and iron grade of 18.1% was used as the research object to reduce and prepare manganese rich slag. The obtained manganese rich slag can be used for smelting silicon manganese alloy to achieve the purpose of efficient utilization of low grade manganese ore. According to the results of composition analysis, XRD analysis and particle size analysis of the ore, the reduction melting separation method was used to prepare manganese rich slag from low manganese ore. The experimental results show that each parameter has a greater impact on the mass fraction of manganese and iron in the reduction melting separation slag of low manganese high iron ore and the recovery rate of manganese under the single factor test. At the same time, combined with the Box Behnke principle design scheme, three experimental factors including temperature, alkalinity and carbon content were selected. The influence of each factor on the recovery rate of manganese was studied by response surface method. The experimental results were analyzed to establish the corresponding polynomial model, and the optimal process conditions were as follows: reduction temperature of 1402℃, alkalinity of 0.10, carbon content of 10.04%, and the recovery rate of manganese was 97%. A verification test was conducted under the optimal conditions; the recovery rate of manganese was 95.80%, and the error was 1.24%, which proved that the response surface method was a reliable and accurate prediction model. At the same time, the results are instructive for the application of low manganese and high iron ore. |
