Manganese resources in the world are mainly distributed in South Africa, the former Soviet Union, Australia, China and other countries. Apart from China, the world's land manganese ore reserves are about 17.292 billion tons.
The main manganese minerals include soft manganese ore, hard manganese ore, black manganese ore, brown manganese ore, rhodochrosite and so on.
There are many classification methods of manganese ore, which can be divided into sedimentary type, metamorphic type and weathering type according to the genesis of the deposit; manganese ore and iron manganese ore according to the iron and manganese content of the ore. According to industrial use, it can be divided into metallurgical manganese ore and chemical manganese ore. In addition, according to the natural types and associated elements of minerals, they are divided into manganese carbonate ore, manganese oxide ore, mixed ore and polymetallic manganese ore.
Manganese carbonate ore exists in various forms of manganese carbonate minerals, and its content accounts for more than 85% of the manganese content in the ore. Manganese oxide ore exists in various forms of manganese oxide minerals, and its content accounts for more than 85% of the manganese content in the ore. The manganese present in the form of various manganese carbonate minerals or manganese oxide in the mixed manganese ore accounts for less than 85% of the manganese content in the ore.
Polymetallic manganese ore is different from the above three kinds of manganese ore, in addition to manganese, it also contains other metal and nonmetal minerals. There are many manganese carbonate mines in China, accounting for about 57% of the total manganese ore. At present, manganese ore beneficiation methods include gravity separation, heavy medium-strong magnetic separation, roasting-strong magnetic separation, single strong magnetic separation, flotation, and a combination of multiple methods.
Manganese minerals are weak magnetic minerals. The strong magnetic separation of manganese ore occupies an important position. A single magnetic separation process for manganese carbonate ore and manganese oxide ore with a relatively simple composition and coarse-grained particle size can obtain better separation indexes. When sorting manganese carbonate ore, the magnetic field strength of the magnetic separator must be above 480 kA / m, while the magnetic field strength of the magnetic separator for sorting manganese oxide ore is higher, generally above 960kA / m.
Magnetic separation of manganese oxide ore. Most of the manganese oxide ore belongs to the secondary ore of the weathering leaching deposit. It has a soft texture and contains more clay minerals. It is very easy to be muddled in the process of ore and transportation. The manganese-containing grade and improvement of crushing, screening, beneficiation and transportation conditions all need to be washed. Coarse particles (about 5 mm or more) are sorted by re-selection methods such as jig, and fine particles (about 5 mm or less) can be separated by strong magnetic separation.
Case 1, Miaoqian mining area of Liancheng Manganese Mine in Fujian Province is a weathering crust type manganese oxide deposit, which is divided into leaching type, Deluvial type and mixed type of leaching and Deluvial, mainly leaching type. The main metal minerals in the ore are hard manganese ore, pyrolusite, manganese soil and limonite, etc., gangue minerals are mainly quartz, followed by sericite, opal, barite, and other impurities are mainly loess, clay, etc.
The ore process includes ore washing, jigging and strong magnetic separation. After crushing to less than 70 mm, the ore shall be washed, sieved and graded first, + 30 mm shall be manually separated, 4.5-30 mm ore shall be re separated by am-30 jig, and - 4.5 mm particles shall be separated by qc-200 induction roller type high magnetic field magnetic separator. 35.68% of the products were selected with strong magnetic field, 41.23% of the concentrate grade and 93.6% of the recovery.
Magnetic separation of manganese carbonate ore. Manganese carbonate deposit, which belongs to marine sedimentary type, has large reserves and scale, and is an important resource for producing commercial manganese ore.
Case 1, The strong magnetic separation plant of Taojiang Manganese Mine in Hunan Province deals with Rhodochrosite and manganese calcite. After fine crushing, grinding and grading, 0.5-4 mm ore enters into cgde-210 strong magnetic separator for separation, 0-0.5 mm ore enters into SHP strong magnetic separator for separation, and the resulting concentrate is combined and sintered.
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