ABSTRACT Magnetic separation is an effective strategy for the upgrading of a variety of lean ores, including the beneficiation of low-grade manganese ores. This work reviews 24 studies on the magnetic separation of manganese ores; 6 of these studies report both a sufficiently high Mn grade (>44% Mn) and Mn/Fe ratio (>7.5) in the concentrate as to be suitable for use as high-grade feed materials in the production of ferromanganese. Of these 24 studies, the most efficient separation and enrichment was generally achieved by the reduction roasting of the ore prior to magnetic separation, rather than the direct separation of the ore. In both cases there was sufficient evidence for correlation, depending on the mineralogy, between the Mn and Fe grades of the ore and the final concentrate grade and Mn/Fe ratio. To yield a concentrate suitable for use in ferromanganese production, it is recommended that the ore contain a minimum initial concentration of ∼25% Mn and ∼10% Fe.

中文翻译：

---

磁选选矿低品位锰矿研究进展

摘要 磁选是包括低品位锰矿选矿在内的各种贫矿提质的有效策略。这项工作回顾了 24 项关于锰矿磁选的研究；其中 6 项研究报告称，精矿中具有足够高的 Mn 品位 (>44% Mn) 和 Mn/Fe 比 (>7.5)，适合用作锰铁生产中的高品位原料。在这 24 项研究中，最有效的分离和富集通常是在磁选前对矿石进行还原焙烧，而不是直接分离矿石。在这两种情况下，都有足够的证据证明矿石的锰和铁品位与最终精矿品位和锰/铁比之间存在相关性，具体取决于矿物学。