Method for preparing manganese sulfate solution from low-grade manganese oxide by reducing leaching at normal temperature and pressure

Abstract

The invention relates to a method for preparing a manganese sulfate solution from low-grade manganese oxide by reducing leaching at normal temperature and pressure, which comprises the following steps: measuring contents of Mn<2+>, (NH4)SO4 and H2SO4 in an anolyte, and calculating addition amounts of manganese oxide ore, pyrite and sulfuric acid; adding the manganese oxide ore powder, sulfuric acid and pyrite as well as a small amount of scrap iron chips into the anolyte while stirring; adding an adsorbent to adsorb simple substance sulfur and other colloids, so that MnO2 and FeS2 ore particles can not be coated by the colloids, and MnO2 and FeS2 molecules are sufficiently subjected to redox at normal temperature and pressure; after leaching, adding a desulphurizer and an oxidizer to oxidize low-valence sulfur; and carrying out solid-liquid separation to obtain the manganese sulfate electrolyte. Under the condition of no external heating, the method provided by the invention utilizes the existing manganese carbonate technological equipment, and uses low-grade irrespective-impurity manganese oxide ore (the manganese grade is 10-18%) as the raw material; and the scrap iron chips, carbon-containing substance catalyst, capturing agent, adsorbent and heat generating agent are added, so that the manganese oxide ore and pyrite are subjected to reduction reaction, thereby leaching out the manganese sulfate solution.

Description

technical field [0001] The invention relates to a method for preparing manganese sulfate solution by reducing and leaching low-grade manganese oxide under normal temperature and pressure. Background technique [0002] Electrolytic manganese metal is widely used. It is an important alloy element in the production of stainless steel, high-strength low-alloy steel, aluminum-manganese alloy, copper-manganese alloy, etc. It is also the main material for the manufacture of manganese tetraoxide, and it is also indispensable in the production of manganese salts for pharmaceutical and chemical industries. Raw materials; newly developed damping alloys also require electrolytic manganese. In foreign iron and steel industry, electrolytic manganese metal is also used as deoxidizer and desulfurizer. [0003] The important mineral of manganese in nature is manganese carbonate (MnCO 3 , also known as rhodochrosite) and manganese oxide (MnO 2 , also known as pyrolusite). The basic charac...

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Problems solved by technology

[0006] Fire reduction methods include rotary kiln heating reduction roasting, microwave heating reduction roasting, boiling furnace reduction roasting and multi-tube shaft furnace reduction method. The rotary kiln heating method separates heating and reduction. The reduction effect is not bad, but the product is easy to agglomerate. The reduction rate is unstable, the heat loss of the reduction furnace is large, and the energy consumption is too high; microwave heating is difficult to promote due to the short service life of the core component magnetron, unstable operation, and high cost; reduction and roasting in fluidized fluidized furnaces cannot be separated due to heating and reduction. Control; the multi-tube shaft furnace reduction method uses a multi-tube shaft furnace to reduce and roast manganese oxide ore, heat with gas, separate heating and reduction, and automatically control the incoming and outgoing materials by machinery. The disadvantage is that the reduction cost is high, especially for roasting carbon reduction. Low-grade manganese oxide ore is economically uneconomical

[0012] The last four technologies mentioned above are all experimental results in laboratory tests, and have not undergone continuous and large-scale production tests, and whether their process parameters are feasible under large-scale production conditions cannot be verified.

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