Owing to its own complex characteristics, large-scale resource utilization using the traditional calcination process makes it difficult to achieve efficient enrichment of rhodochrosite. In this study, the microwave calcination followed by magnetic separation was proposed as an effective method for enriching manganese ore from rhodochrosite. The phase transition and microstructural evolution of the main minerals during the calcination process were also systematically investigated. The experimental results demonstrate that magnetic fractions with a grade of 21.64%, recovery rate of 86.56% and yield of 71.20% can be obtained under the optimized conditions. The rhodochrosite phase is selectively changed to manganosite during the calcination process. The cracks between manganese minerals and gangue minerals inside the rhodochrosite, as well as the porous structure on the surface of the ore, are generated, which contributes to achieve more complete dissociation of manganese minerals in subsequent grinding, thereby facilitating separation and enrichment effects.

中文翻译：

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微波煅烧后磁选对低品位难降解菱锰矿的浓度研究

由于其自身复杂的特性，利用传统煅烧工艺进行大规模资源利用，难以实现红锰矿的高效富集。本研究提出微波煅烧后磁选是红锰矿富集锰矿的有效方法。还系统研究了主要矿物在煅烧过程中的相变和微观结构演变。实验结果表明，在优化条件下，可获得品位为21.64%、回收率为86.56%、收率为71.20%的磁性馏分。在煅烧过程中，菱锰矿相选择性地变为锰铁矿。在菱锰矿内部产生锰矿物和脉石矿物之间的裂纹，以及矿石表面的多孔结构，有助于在后续的研磨中实现锰矿物更完全的解离，从而促进分离和富集效果。