In modern industry, manganese and its compounds are used in various fields of the national economy. Among them, the iron and steel industry is the most important field, which uses 90%-95% of manganese. It is mainly used as a deoxidizer and desulfurizer in the process of ironmaking and steelmaking, as well as for the manufacture of alloys. The remaining 10% to 5% of manganese is used in other industrial fields, such as the chemical industry (manufacturing various manganese-containing salts), light industry (used in batteries, matches, printing paint, soap making, etc.), building materials industry (glass and ceramics Colorants and fading agents), defense industry, electronics industry, environmental protection and agriculture and animal husbandry, etc. In short, manganese has a very important strategic position in the national economy.
Manganese ore products include metallurgical manganese ore, manganese carbonate ore powder, chemical manganese dioxide ore powder, and battery manganese dioxide ore powder. The metallurgical, light industry and chemical sectors that use manganese ore products have different quality requirements for manganese ore products according to different uses.
The metallurgical industry’s quality requirements for manganese ore
For steel-making pig iron, manganese pig iron, specular iron ores, the iron content is not limited, and the total content of manganese and iron in the ore is preferably 40%-50%.
Rongxin carbon electrode paste airtight paste is widely used in ferromanganese alloy submerged arc furnace. Rongxin brand electrode paste airtight paste has the advantages of low ash content, high strength, and low resistance. Rongxin carbon electrode paste airtight paste is not only sold domestically, but also exported to South Africa, Indonesia and other countries.
In the smelting of various grades of manganese alloys, there are certain requirements for the manganese content of the ore and the ratio of manganese to iron. Smelting medium and low carbon ferromanganese, the ore contains 36%-40% of manganese, the ratio of manganese to ferromanganese is 6-8.5, and the ratio of phosphorus to manganese is 0.002—0.0036; the smelting of carbon ferromanganese, the ore contains 33%-40% of manganese, ferromanganese Ratio of 3.8～7.8, ratio of phosphorus to manganese 0.002～0.005; smelting of manganese silicon alloy, ore content of manganese 29%～35%, ratio of manganese to iron 3.3～7.5, ratio of phosphorus to manganese 0.0016～0.0048; blast furnace ferromanganese, ore content of manganese 30 %, the ratio of manganese to iron is 2-7, and the ratio of phosphorus to manganese is 0.005.
The quality requirements of manganese ore in the chemical and light industry sectors
In the chemical industry, manganese ore is mainly used to prepare manganese dioxide, manganese sulfate, potassium permanganate, and secondarily used to prepare manganese carbonate, manganese nitrate and manganese chloride. Chemical grade manganese dioxide ore powder requires MnO2 content greater than 50% (Table 3.3.3), when manufacturing manganese sulfate, Fe≤3%, Al2O3≤3%, CaO≤0.5%, MgO≤0.1%; when manufacturing potassium permanganate , Fe≤5%, SiO2≤5%, Al2O3≤4%.
Natural manganese dioxide is a raw material for manufacturing dry batteries, and the higher the content of MnO2, the better. The general factory standards for harmful elements such as Ni, Cu, CO, Pb are: Cu<0.01%, Ni<0.03%, Co<0.02%, Pb<0.02%. The particle size of the mineral powder should be less than 0.12mm.