Distribution of manganese ore resources

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I came across this article while researching, and I think it will be very useful for those who are new to manganese ore. I’m sharing it with all of you! Manganese ore (MANGANSESORE) 1. Overview: Manganese is widely distributed in nature, and it is present in almost all types of ores as well as silicate rocks. The most common manganese ores are anhydrous and hydrated manganese oxides as well as manganese carbonate. There are 150 known manganese minerals, but only 5–6 of them contain high levels of manganese and can be concentrated to such an extent as to become economically valuable. The most important and economically valuable among these are pyrolusite and rhodochrosite; other examples include hydromanganese oxide, praseodymium manganite, melanomanganite, and rhombomanganite. The manganese content in these minerals can reach around 50–70%, making them important industrial minerals for manganese. (1) Pyrolusite: Its chemical composition is MnO2, with a manganese content that can reach up to 63.2%; it often contains small amounts of water, silica, iron oxide, and pyromanganese ore. They are usually columnar crystals, but can also be needle-shaped, fibrous, granular, etc. Hardness 1–2.5, specific gravity 4.7–4.8. Metallic luster or matte. The colors are iron black or light blue-black. The streak is black. Sexual softness can contaminate the fingers; it is opaque. (2) Pyrolusite: Its composition is hydrated manganese oxide. Molecular formula: rMnO•1MnO2•mH2O. The manganese content is about 45–60%. It often contains impurities such as iron, calcium, copper, and silicon. It forms clumpy, grape-like, stalactitic, dendritic, or earthy aggregates with a smooth surface. Hardness 5–6, specific gravity 3.7–4.7. Semimetallic luster to dull. Color ranges from dark gray to iron black. The streak is bright light dark brown in color and opaque. It is brittle, with a smooth or shell-like fracture surface. 2. Property: Manganese ore can usually be decomposed by acids. Common acids include hydrochloric acid, nitric acid–hydrogen peroxide, hydrofluoric acid–sulfuric acid, and phosphoric acid–nitric acid. Mineral samples that are not decomposed by acids can be melted and decomposed using basic or acidic fluxes. Pyrolusite decomposes when heated to 550–600°C, turning into β-manganese oxide (Mn2O3). Most manganese ores contain a considerable amount of moisture, and especially dried manganese ores have a high water absorption capacity. Manganese ore generally contains impurities such as silica, phosphorus, lead, sulfur, aluminum, arsenic, barium, calcium, magnesium, potassium, and sodium. Copper, cobalt, nickel, and other rare metals may also be present in manganese ore deposits. Silica, sulfur, phosphorus, and arsenic are all harmful impurities; in particular, the level of phosphorus is very important and serves as a key indicator for evaluating manganese ore quality. And some of them contain calcium oxide and magnesium oxide, which are beneficial components during smelting. 3. Uses (1) In the metallurgical industry: Manganese is an essential raw material for the steel industry. Manganese is a very strong reducing agent; it can absorb all the oxygen from the molten steel, eliminating iron oxide and resulting in a pore-free steel ingot. Secondly, manganese is also an excellent desulfurizing agent; it can remove all the sulfur from molten steel. Adding a small amount of manganese to steel can **improve its mechanical properties, such as ductility, malleability, toughness, and wear resistance. Manganese steel, ferromanganese, as well as various alloys made of manganese with copper, aluminum, nickel, cobalt, etc., and manganese compounds have extensive industrial applications. ①In ferrous metallurgy. Standard ferromanganese can be smelted using high-grade manganese ore containing iron. Ferromanganese is an additive used in the production of special steels; it can also be used to produce small amounts of silicomanganese. Silicomanganese is very useful for smelting certain types of steel ； ②In the non-ferrous metallurgy industry. Alloys of manganese and copper can be used to manufacture corrosion-resistant metal storage containers. Manganese bronze alloys can be used for ship equipment. Manganese aluminum alloys have great applications in the aviation industry. Manganese-nickel-copper alloys can be used to manufacture standard resistance wires. (2) In the chemical industry: Manganese dioxide (pyrolusite) can be used as a cathode material in the manufacture of dry cells, and it can be used to produce paint dryers in the chemical industry. Black decorative glass can also be produced, as well as colors for glazing decorative bricks and ceramics. It can also be used to form various manganese compounds, such as manganese sulfate, manganese chloride, potassium permanganate, etc. 4. Place of origin and quality specifications: The main production areas are located in the southern part of China, such as Wuxuan, Guiping, Fangcheng, and Qinxian in Guangxi ； Xiangtan, Changning, Yueyang, Changsha in Hunan, etc ； Meixian, Huiyang, Taishan in Guangdong, etc ； Zunyi and Weining in Guizhou ； Pingluo, Xundian, Dongchuan in Yunnan, as well as Pingle in Jiangxi. The main foreign producing countries are India at the top, followed by North America, Russia, South Africa, Australia, Gabon, and others. Quality specifications: At present, there are no unified standards for various types of manganese ore in China. They are generally divided into two types: manganese ore sand (also known as pyrolusite) and pyrolusite powder (also known as soft manganese oxide). Its specifications are as follows: Manganese ore sand specification: 25–50% manganese content ； Silica less than 40% ； Sulfur: 0.2% or less ； Phosphorus: less than 0.2%. Pyrolusite specification: contains over 60% manganese dioxide. Quality requirements for manganese ore are specified according to various uses: The technical specifications for ore suitable for the smelting of ferromanganese are shown in the table below. Grade Technical specifications for ore used in ferromanganese smelting Mn% SiO2% Mn:Fe P% I-A 50% or more 9% or more Not less than 6–7 0.17–0.20% or less I-B 40–50% 9–15% Not less than 7–10 0.14–0.17% or less II 35–40% 15–25% Not less than 3–4 0.18% or less III 30–35% 25–35% Not less than 4–5 0.15% or less The requirements for manganese ore used in the manufacture of dry batteries are as follows: manganese dioxide content must be 80% or more ； The iron content is not more than 3% ； The lime content should not exceed 2–3% ； Soluble compounds of cobalt, nickel, and arsenic are highly harmful, and only trace amounts are allowed. The copper content must not exceed 0.2%. 5. Import sources: In recent years, the main countries from which China imports manganese ore include Australia, India, Gabon, etc. The specifications for manganese ore require a manganese content of not less than 45%, silica content of not more than 12.5%, iron content of not more than 6.0%, and phosphorus content of not more than 0.05%. There are two particle size specifications: at least 80% of the particles should be in the range of 1–8 mm, and at least 80% should be in the range of 10–80 mm. 6. Inspection standard GB/T2011—87 \"Methods for sampling and sample preparation of bulk manganese ore\" ； The chemical analysis of manganese ore is carried out in accordance with GB1506–1511-79, GB1515–1516-79, GB1518–1519-79, GB/T14949.2-94, GB/T14949.6-94, and GB/T14949.8–GB/T14949.10-94.