Manganese ore is a kind of metal mineral that we use more frequently. Our common manganese minerals are mainly manganese oxide ore and manganese carbonate ore. Both manganese oxide and manganese carbonate ore contain some refractory ores, and manganese closely coexists with iron, phosphorus, or gangue. , The particle size of the embedded cloth is extremely fine, and it is difficult to sort, so you can consider using smelting methods.
For example, the manganese-rich slag method for processing high-phosphorus, high-iron, and manganese ore, the leaching method for producing active manganese dioxide, and the electrolytic method for producing metallic manganese have all been industrially produced. In addition, the calcium dithionate method and the bacterial leaching method are also being studied. Below we mainly introduce manganese ore beneficiation methods, mainly based on the classification of these two ore.
1. Manganese Carbonate Ore
In sedimentary manganese carbonate ores, the main manganese minerals are rhodochrosite, calcium rhodochrosite, manganese-bearing calcite, and rhodochrosite; gangue has silicate and carbonate minerals; it is also often associated with impurities such as sulfur and iron. Ores are generally more complex, and the size of manganese minerals is as small as micrometers, which is not easy to dissociate, and it is often difficult to obtain higher concentrate grades.
The production practice of manganese carbonate ore beneficiation is less, and methods such as strong magnetic separation, heavy medium beneficiation, and flotation have been studied. Some sedimentary sulfur-containing manganese carbonate ore industrially adopts the sequential priority flotation process of carbonaceous shale, pyrite, and manganese minerals. Some hydrothermal lead-zinc manganese carbonate ore adopts a flotation-strong magnetic separation process. For some sulfur-rich manganese ores, the manganese minerals are mainly manganese pyrite, which can be desulfurized by roasting. Some manganese carbonate-rich ore production also uses roasting methods to remove volatile components to obtain finished ore.
2. Manganese Oxide Ore
The primary and secondary manganese oxide ore from weathered deposits are the main ones, as well as the primary and secondary manganese oxide ore from some sedimentary and hydrothermal deposits. The manganese minerals in the ore are mainly pyrrolesite, pyrolusite, and manganese ore; the gangue is mainly silicate minerals, but also carbonate minerals; often accompanied by iron, phosphorus, nickel, and cobalt.
Among the iron-bearing manganese oxide ores, the iron minerals are mainly limonite. It is difficult to separate iron and manganese by gravity separation, flotation, or strong magnetic separation, and a reduction roasting magnetic separation method is required. The industry has adopted the process of ore washing-reduction roasting magnetic separation-gravity separation.
The beneficiation method of manganese oxide ore is mainly gravity separation. Weathered manganese oxide ore often contains a large amount of sludge and fine ore, and the ore washing-gravity separation method is used in production. The raw ore is washed to remove the sludge, and some of the net ore obtained can be used as a finished ore, and some need to be re-selected by jig and shaker.
Ore washing overflow sometimes needs to be further recovered by gravity separation or strong magnetic separation. For some sedimentary primary manganese oxide ore, due to the dilution of mining, heavy medium, and jig-gravity selection are used to remove gangue in production, and the massive concentrate is obtained.