Manganese ore description
The earliest countries in the world to use manganese minerals are Egypt, ancient Rome, India and China. The discovery of Manganese, however, came much later, when it was discovered by Swedish mineralogist G. Gahn reduced manganese from pyrolusite in 1774. South Africa, Ukraine, Australia, Brazil and India are the largest reserves of manganese.
Manganese mineral application
Manganese products include metallurgical manganese ore, manganese carbonate ore powder, chemical industry use and battery use manganese dioxide ore powder. The metallurgical, light industrial and chemical sectors that use manganese ore products have different quality requirements for manganese ore products according to different uses.
Manganese ore distribution
The distribution of manganese ore in the world is not only uneven, but also the grade of manganese ore varies greatly in different areas. Manganese-rich ore resources are mainly concentrated in South Africa, Gabon, Brazil and Australia. For example, the Kalahari mine in South Africa has a manganese ore grade of 30-50 percent, the Groote Eylandt mine in Australia has a manganese ore grade of 40-50 percent, and India, Kazakhstan and Mexico are medium-grade manganese resource countries. The low-grade manganese, about 35%-40 %, mainly in Ukraine, China and Ghana, it needs to be beneficiated and artificially enriched before it can be sold as a commodity ore (grade more than 35%).
How to beneficiation low-grade manganese ore?
Because most of the manganese ores are distributed in fine or micro-fine particles, and there are quite a lot of high-phosphorus ore, high-iron ore, and associated metals, so it is quite difficult for manganese mineral processing. At present, the common beneficiation methods of manganese ore are mechanical separation (including ore washing, screening, gravity separation, strong magnetic separation, and flotation), pyro-concentration, chemical separation and so on.
Manganese ore processing technology and beneficiation equipment
1. Ore washing and screening
Ore Washing is the use of hydraulic washing or additional mechanical scrubbing to separate the ore from the mud. Common Equipment ore washing screen, drum washing trommel machine and trough ore washer.
Washing operations are often accompanied by screening, such as washing directly on the vibrating screen or sending the ore obtained by the washing machine to the vibrating screen. Screening can be used as an independent operation to separate products of different granularity and grade for different purposes.
2. Gravity separation
At present, gravity separation is only used to separate manganese ore with simple structure and coarse particle size, especially for manganese oxide ore with high density. The common methods are heavy medium dressing, jigging dressing and shaking table dressing.
The technological process of dealing with manganese oxide ore is generally crushing the ore to 6 ~ 0 mm or 10 ~ 0 mm, then classification, jigging at the coarse level and shaking at the fine level. The gravity separation equipment is mostly Haz reciprocating mineral jig and 6-S type shaking table.
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3. Strong magnetic separation
Manganese minerals are weak magnetic minerals, which can be recovered from high magnetic field separators with magnetic field strength Ho 800 ~ 1600KA / M (10000 ~ 20000oe), generally increasing manganese grade by 4% ~ 10 %.
Because of its simple operation, easy control and strong adaptability, magnetic separation is widely used to separate all kinds of manganese ores. Various new types of coarse, medium and fine grain strong magnetic machines have been developed successively. At present, the most common application is medium-grain high-intensity magnetic separators, coarse-grain and fine-grain high-intensity magnetic separators followed, fine-grain high-intensity magnetic separators are still in the experimental stage.
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4. Combination of gravity and magnetic separation
Take the Liancheng manganese processing plant as an example, it mainly deals with leaching type manganese oxide ore, using AM-30 jig machine treat 30 ~ 3 mm cleaning ore, can obtain high-quality manganese concentrate containing more than 40% manganese mineral. The grade of manganese concentrate should be increased by 24% ~ 25% to 36% ~ 40% after the jigging tailings and washed ores with diameters less than 3mm are ground to less than 1m and separated by high-intensity magnetic separator.
5. Combination of high intensity magnetic – flotation
Zunyi manganese mine adopts high intensity magnetic – flotation separation technology, it mainly processes with manganese carbonate ore with low content of manganese, low content of phosphorus, and high content of iron.
Ore grinding machine has rod mill and ball mill, all in wet type grinding machines, combines with the SHP-2000 type strong magnetic separation machine and CHF pneumatic flotation machines. After many years of production test, it turns out that the magnetic – flotation separation processing method is suitable for manganese ore dressing application.
6. Pyrometallurgical beneficiation
Pyrometallurgical beneficiation of manganese ore is a kind of ore dressing method for treating high-phosphorus and high-iron poor manganese ore. Its working principle is that selective separate manganese, phosphorus, iron by controlling the furnace temperature.
The pyrometallurgical enrichment process is simple and stable, which can effectively separate iron and phosphorus from ore and obtain enrich manganese slag with a high content of manganese, low content of iron, and low content of phosphorus. This manganese-rich slag generally contains 35% ~ 45% MN, Mn/Fe ratio 12～38，P/Mn<0.002, it is a kind of high-quality manganese alloy raw material, and it is difficult for the natural manganese ore to reach the above 3 indexes at the same time. Therefore, pyrometallurgical enrichment is a promising mineral processing method for refractory ores with high phosphorus, high iron and low manganese content.
Complete equipment for manganese ore beneficiation process
Mainly have the vibrating feeder, PE coarse jaw crusher, PEX fine jaw crusher, vibrating screen, bin, pendulum feeder, electro-vibrating feeder, ball mill, spiral classifier, high-frequency screen, mixing tank, flotation machine, concentrator, filter press, filter separator, dryer and so on.
These mining machines also suited for
Beneficiation of weakly magnetic minerals, such as hematite, limonite, ilmenite, wolframite, tantalum-niobium, etc.
Non-metallic mineral iron removal and purification, such as quartz, feldspar, nepheline, fluorite, sillimanite, lithium, kaolinite and so on.
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