In grinding process, two sections of a closed grinding is efficient grinding process, which can make the manganese mill more fully.In the new process, the representatives of emergence successful processing technology in recent years are: "Stage grinding, low intensity magnetic separation and reverse flotation process, whole magnetic separation process, Ultra-fine crushing—wet magnetic separation tailings process"
Manganese is a silvery-gray metal that resembles iron. It is hard and very brittle, difficult to fuse, but easy to oxidize. Manganese metal and its common ions are paramagnetic. Manganese tarnishes slowly in air and "rusts" like iron, in water containing dissolved oxygen.
Manganese makes up about 1000 ppm (0.1%) of the Earth's crust, making it the 12th most abundant element there. Soil contains 7–9000 ppm of manganese with an average of 440 ppm. Seawater has only 10 ppm manganese and the atmosphere contains 0.01 μg/m3. Manganese occurs principally as pyrolusite (MnO2), braunite, (Mn2+Mn3+6)(SiO12), psilomelane (Ba,h3O)2Mn5O10, and to a lesser extent as rhodochrosite (MnCO3).
Manganese is widely distributed in nature, almost all kinds of ores and silicate rocks contain manganese. The most common manganese ore is anhydrous and hydrous manganese oxide and manganese carbonate. Manganese minerals are known to have 150 kinds. But manganese minerals that can bring economic value are just 5-6 kinds. The most important and the most valuable manganese are Pyrolusite and hard manganese. Also water manganese ore, manganese ore, manganese ore, brown black Rhodochrosite contain 50~70% manganese and are important industrial mineral manganese.
Manganese is mined in South Africa, Australia, China, Brazil, Gabon, Ukraine, India and Ghana and Kazakhstan. US Import Sources (1998–2001): Manganese ore: Gabon, 70%; South Africa, 10%; Australia, 9%; Mexico, 5%; and other, 6%. Ferromanganese: South Africa, 47%; France, 22%; Mexico, 8%; Australia, 8%; and other, 15%. Manganese contained in all manganese imports: South Africa, 31%; Gabon, 21%; Australia, 13%; Mexico, 8%; and other, 27%.
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