In modern industry, manganese and its compounds are used in various fields of the national economy. Wherein the steel industry is the most important area with manganese accounts for 90% to 95%, mainly iron and steel making process as deoxidizer and desulfurizer, and means for producing an alloy. The remaining 10% to 5% of manganese is used in other industrial fields, such as chemical industry, light industry, building materials industry, national defense industry, electronics industry, as well as environmental protection and agriculture and animal husbandry. In short, manganese has a very important strategic position in the national economy. At present, the commonly used manganese ore beneficiation methods are mechanical beneficiation (including washing, sieving, re-election, strong magnetic separation and flotation), as well as fire enrichment and chemical beneficiation. Manganese ore beneficiation processes include: (1) Washing and sieving. Washing is the use of hydraulic washing or additional mechanical scrubbing to separate the ore from the mud. Commonly used equipment includes washing sieves, cylinder washing machines and tank washing machines. The washing operation is often accompanied by sieving, such as direct flushing on the vibrating screen or sifting the ore (net ore) obtained by the washing machine to the vibrating screen. Screening can be used as an independent operation to separate products of different sizes and grades for different purposes. (2) Re-election: At present, re-election is only used to select manganese ore with simple structure and coarse grain size, especially suitable for manganese oxide ore with high density. Common methods include heavy medium dressing, jigging and shaker dressing. (3) Strong magnetic separation: Because magnetic separation is easy to operate, easy to control, and adaptable, it can be used for various manganese ore sorting. In recent years, it has dominated manganese ore dressing. Various new types of coarse, medium and fine grain magnetic machines have been successfully developed. At present, the most common application of manganese ore in China is the medium-grain strong magnetic separator. The coarse-grained and fine-grained magnetic separators are gradually being applied. The micro-grain-strong magnetic separator is still in the experimental stage. (IV) Heavy-magnetic selection: At present, the heavy-magnetic separation plants that have been newly built and reconstructed in China include Fujian Liancheng, Guangxi Longtou, Jingxi and Xialei. For example, Liancheng Manganese Mine Heavy-Magnetic Separation Plant mainly treats leaching manganese oxide ore, and uses AM-30 jig to treat 30~3mm washed ore, which can obtain high-quality manganese concentrate containing more than 40% manganese. After the removal of impurities, it can be used as a raw material for battery manganese powder. After jigging tailings and less than 3mm fine-grained minerals are ground to less than 1mm, the strength of manganese concentrate is increased by 24%~25%, reaching 36%~40% by strong magnetic separator. (5) Strong magnetic-flotation: At present, only the Zunyi manganese ore is used in the strong magnetic-flotation process. The mine is a manganese carbonate-based low Mn, low phosphorus, high iron ore. According to industrial tests, the grinding process uses rod mill-ball milling stage grinding, and the equipment scale is φ2100mm×3000mm wet grinding machine. The strong magnetic selection adopts the shp-2000 type strong magnetic machine, and the flotation machine mainly uses the CHF type inflatable flotation machine. After years of production test, the performance is good, it is very suitable for Zunyi manganese ore dressing application. The strong magnetic-flotation process has been successfully tested and applied in production, which indicates that the deep selection of manganese ore in China has taken a big step forward. (6) Enrichment of fire method: The enrichment of manganese ore is a sorting method for treating high-phosphorus and high-iron difficult-to-select manganese-poor ore, generally called manganese-rich slag method. The essence is a high-temperature sorting method for selectively separating manganese, phosphorus and iron by controlling the temperature of manganese, phosphorus and iron in different temperatures in a blast furnace or an electric furnace. The fire enrichment process is simple and stable in production, and can effectively separate iron and phosphorus in the ore, and obtain manganese-rich, low-iron, low-phosphorus-rich manganese slag, which generally contains Mn 35% to 45%. Mn/Fe 12~38, P/Mn<0.002, is a high-quality manganese-based alloy raw material, and it is also an artificial rich ore that is difficult to achieve the above three indexes at the same time. Therefore, the enrichment of fire method is a promising method for mineral processing in China for high-phosphorus high-iron and low-manganese refractory ore. (VII) Chemical Manganese Method: There are many chemical beneficiations in manganese. A lot of research work has been carried out in China, among which there are many tests, and the more promising are: dithionate method, black manganese ore method and bacterial immersion method. It has not yet been put into industrial production. Spiral Rollers Spiral Rollers,159Mm Conveyor Roller,Conveyor Roller For Coal Mine,Steel Spiral Roller SHIJIAZHUANG VITURE IMPORT AND EXPORT TRADING CO.,LTD ,
Manganese ore beneficiation technology and washing technology