At present, the commonly used method of manganese ore beneficiation mechanical dressing (including washing, screening, re-election, high intensity magnetic separation and flotation), and fire enrichment, chemical processing method. The following focuses on the steps of washing, sieving, re-election, strong magnetic separation and flotation in the manganese ore beneficiation process.
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, which is especially suitable for manganese oxide ore with high density. Common methods include heavy medium dressing, jigging and shaker dressing.
At present, the process of treating manganese oxide ore in China is generally to crush the ore to 6~0mm or 10~0mm, then group, coarse-grade jigging, and fine-level shaker selection. Most of the equipment is a Haz-type reciprocating jig and a 6-S shaker.
3, strong magnetic selection
Manganese mineral is a weak magnetic mineral [specifical magnetization coefficient X=10×10-6～600×10-6cm3/g], and it can be used in a strong magnetic field magnetic separator with magnetic field strength Ho=800～1600kA/m (10000～20000oe). When recovered, it can generally increase the manganese grade by 4% to 10%.
Due to the simple operation, easy control and strong adaptability of magnetic separation, 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.
4, 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 washing ore grinding to less than 1m, the selection of manganese ore concentrate should be increased by 24% to 25%, reaching 36% to 40%.
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 a rod mill- ball mill 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.
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