I. Introduction type of manganese ore to manganese carbonate-based, 73% of the total reserves. The grade of this type of ore is very low. Generally, the grade of Mn is below 20%. Most of them are marine sedimentary and sedimentary metamorphic manganese deposits, with reserves of 39.336 million tons, mainly distributed in Yunnan, Sichuan, Hunan, Hubei, Guangxi and other provinces ( Area). Among them, the reserves of high- phosphorus manganese ore are 238.851 million tons, accounting for 60.61%. The research on enrichment and phosphorus reduction of manganese carbonate ore has been paid attention to. Second, the high-phosphorus and low-manganese manganese ore beneficiation China's manganese ore has formed a relatively complete industrial system in the selection and smelting. At present, the main methods for enriching manganese ore are re-election, magnetic separation, flotation, and enrichment by fire, or a combination of several methods. Manganese carbonate ore is mainly flotation, sometimes accompanied by re-election and strong magnetic separation. The manganese ore in a certain area of ​​Shaanxi is a high-phosphorus and low-manganese manganese ore. The ore contains low manganese (11%), high impurity phosphorus (1.10%), manganese minerals mainly manganese carbonate, and manganese oxides are rare. Manganese carbonate minerals include manganese dolomite, rhodochrosite, and manganese calcite , which account for 67.20%. Among them, mainly manganese dolomite, rhodochrosite accounts for about 8%, and manganese calcite is rare. Manganese dolomite is mainly composed of granular and vein aggregates, with a vein diameter of 0.085 to 0.1455 mm and a granular particle size of 0.0291 to 0.0485 mm. The rhombohedral ore is spherical or ring-shaped, and contains quartz fine particles or carbonaceous and shale, and the particle size is mostly in the range of 0.0485 to 0.194 mm. The gangue minerals are quartz, dolomite, calcite and the like. The harmful impurities are colloidal phosphate, which has the biological structure of mollusks, such as bryozoans and ostracods, and is connected with quartz and manganese dolomite as vein aggregates, resembling opal, crack cleavage, and cleavage along cracks. It is replaced by calcite, with a particle size of 0.1455-0.0813 mm and a small amount of fine-grained apatite. The results of multi-element analysis of raw ore are shown in Table 1, and the results of phase analysis of manganese are shown in Table 2.
Table 1 % of multi-element analysis of mines
Table 2 Results of phase analysis of ore manganese
According to the characteristics of the ore, the test compares the desiccant and non-de-sludge, grading and non-grading dry strong magnetic separation scheme, and determines the desliming-grading-magnetic separation process. The wet magnetic separation scheme was used to recover the manganese in the 22.59% of the slime, and the manganese concentrate with a yield of 44.01%, manganese content of 18.41% and phosphorus of 0.31% was obtained. The manganese recovery rate reached 71.16%. The grading dry strong magnetic separation can remove about 67% of the phosphorus in the ore, that is, the content of manganese in the magnetic separation concentrate can be increased to 18.41%, and the phosphorus can be reduced to 0.31%, which has reached the grade requirement of the fifth-grade manganese concentrate. If we want to increase the grade of manganese and reduce the phosphorus to below 0.2%, it is still a problem that is difficult to solve by this method. In my case, two original ore mills to -74 wilting 5 accounted for 65%. After deliming, the coarse sand and the slime were separately subjected to wet magnetic separation to obtain a product containing 17.14% manganese, a recovery rate of 63.03%, and a phosphorus content of 0.41%. . The experiment also carried out neutral calcination, chemical phosphorus removal research. The conditions of the baking time and temperature were tested in a box muffle furnace. The grade is increased to 26% to 28%, and the phosphorus content is also increased to 0.43% to 0.53%. According to the chemical properties that manganese oxide is not easy to react with dilute sulfuric acid, and phosphorus is easily dissolved by dilute acid, a dilute sulfuric acid leaching phosphorus removal test is carried out. Acid leaching is carried out under mechanical agitation. When the sulfuric acid concentration is 6%, the leaching time is 60-90 min, and the solid-liquid ratio is 1:7 to 1:15, the manganese concentrate grade is increased to 30% to 33%, and the phosphorus is lowered. Below 0.2%, the purpose of removing phosphorus and improving the grade of manganese concentrate is achieved. III. Low-grade refractory manganese ore beneficiation test in a certain area Yu Xinwen, Yang Xiaojun [2] conducted a beneficiation test on a low grade refractory manganese ore. The main
metallic minerals rhodochrosite, pyrolusite, water (brown) manganese, magnetic
iron pyrite and other gangue minerals quartz, dolomite, clay minerals, followed by chlorite,
sericite, green Curtain stone, biotite, etc. The ore manganese grade is 17.61%, manganese is mainly contained in manganese carbonate, the occupancy rate is 74.96%, followed by pyrolusite and water (brown) manganese ore. The rhombohedral ore is formed into a granular shape with a fine particle size, generally -0.03mm, which is a micro-mudling rhombohedral ore, which is composed of a strip of rhodochrosite. The strips have different shades of brown and red, and have a certain direction. Sexual, nearly parallel. It is closely symbiotic with minerals such as quartz, dolomite, chlorite and sericite. The ore is mainly composed of a strip-like structure, followed by a star-sparse-sparse disseminated structure.
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