The ore dressing method of manganese oxide ore is mainly based on re-election. Weathered manganese oxide ore often contains a large amount of slime and fine ore, and a washing and re-election method is adopted in production. The ore is washed and removed to remove the slime, and the obtained net ore can be used as a finished ore, and some need to be selected by jigging and shaking. Washing overflows sometimes require further recovery by re-election or strong magnetic separation. Some sedimentary primary manganese oxide ore, due to the depletion of mining, the use of heavy medium and jigging re-election to remove gangue, to obtain massive concentrate.
In iron-bearing manganese oxide ore, the iron mineral is mainly limonite. Iron and manganese are difficult to separate by re-election, flotation or strong magnetic separation, and a reduction roasting magnetic separation method is required. The industry has adopted a washing-reduction roasting magnetic separation-re-election process.
(2) Manganese carbonate ore
Among the sedimentary manganese carbonate ore, the main manganese minerals are rhodochrosite, calcium rhodochrosite, manganese-containing calcite and rhodochrosite; gangue has silicate and carbonate minerals; it is also often associated with impurities such as sulfur and iron. The ore is generally more complicated. The size of the manganese mineral inlay is as small as a few microns, which is difficult to dissociate, and it is often difficult to obtain a higher concentrate grade.
Manganese carbonate ore dressing production practice is less, and methods such as strong magnetic separation, heavy medium beneficiation and flotation are studied. Some sedimentary sulphur-containing manganese carbonate ore, industry: the sequential preferential flotation process of carbon shale , pyrite and manganese minerals. Some hydrothermal manganese ore containing lead zinc carbonate, high intensity magnetic separation using a flotation process. Some sulfur-rich manganese ore, manganese minerals are mainly sulphur-manganese ore, and can be removed by roasting. Some manganese carbonate ore production also uses a roasting method to remove volatile components to obtain a finished ore.
Both manganese oxide and manganese carbonate ore contain some refractory ore. Manganese is closely symbiotic with iron, phosphorus or gangue. The size of the inlay is extremely fine and difficult to sort. It can be treated by smelting method. For example, treatment of high phosphorus high iron and manganese rich manganese ore slag, production of activated manganese dioxide and nitric acid leaching of electrolytic manganese metal production method etc. has industrial production. In addition, calcium disulfate method and bacterial leaching method are also being studied.
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