Manganese ore, most of which are low grade ore, beneficiation processing must be carried out. However, the
majority of manganese ore is fine-grained or micro-fine disseminated, and a considerable number of high phosphate, high iron ore, and (with) students useful metals, and therefore very difficult
to beneficiation processing. At present, manganese ore for machinery election (including washing, screening, re-election, high intensity magnetic separation and flotation), and
fire enrichment, chemical processing method.
A washing and screening
Washing is the use of hydraulic flushing or additional mechanical scrubbing the separation of ore and shale. Commonly used equipment wash the griddle, cylinder
washing machine and trough-type washing machine.
Washing operations often associated with screening, such as the shaker directly flush cleaning or washing
machine ore (Net mine) sent shaker screening. Screening can be as an independent operation, the separation of different particle size and grade of product supply for different
uses.
(2) re-election
Re-election only used for sorting a simple structure, disseminated coarse-grained ore, especially suitable for high density of oxide ore. Common methods of
heavy media beneficiation jig beneficiation and shaker beneficiation.
China deal with the process of manganese oxide minerals are generally broken ore to 6 ~ 0mm or 10 ~ 0mm, then grouping the coarse level of the jig, the fine
level to send shaker election. Equipment and more Haz reciprocating type jig and 6-S shaker. (3) high intensity magnetic
separation
Manganese compound belongs to the weakly magnetic minerals [than the susceptibility X = 10 × 10-6 600 × 10-6cm3 / g,], in a strong magnetic field of the magnetic field strength
Ho = 800 ~ 1600kA / m (10000 20000oe) separatorare recycled, generally can improve the manganese grade of 4% to 10%.
Magnetic separation is simple, easy to control, adaptable, and can be used for a variety of manganese ore sorting, in recent years has been dominated in the manganese
ore. New types of coarse, medium and fine-grained magnetic machine has been developed and successfully. At present, the most common manganese, medium-grained
strong magnetic separator, coarse and fine strong magnetic separator has gradually been applied to micro-fine strong magnetic separator is still at an experimental stage.
(4) weight - magnetic separation
At present, new and converted into a weight - magnetic separation plant, Liancheng, Fujian, Guangxi, leading, Jingxi and lower mines manganese. Such as the
Citylink manganese weight - magnetic separation plant, processing oxide ore leaching, the use of AM-30 jig handle 30 ~ 3mm of washed ore, manganese available to more than 40% of the quality
manganese ore, and then handled impurities selecting battery manganese raw material. Jig tailings and less than 3mm wash mine diameter grinding to less than
1m, with a strong magnetic separator, sorting, manganese ore grade increased by 24% to 25%, 36% to 40%.
5 Magnetic - flotation
Currently used in magnetic - flotation process is only Zunyi manganese. The mine is a manganese carbonate-based, low manganese, low phosphorus, iron ore.
According to industry tests the grinding process using a rod mill - milling stage grinding, and size of equipment are φ2100mm × 3000mm wet mill. The strong
magnetic shp-2000-type magnetic machine, flotation machine with CHF type inflatable flotation machine. After years of production tests, good performance, well suited to the
Zunyi manganese ore dressing application. Magnetic - flotation process successfully tested and in production are applied, marks China's manganese deep election a big step
forward.
6. Fire enrichment
Fire of manganese ore enrichment deal with high phosphorus, high iron refractory poor manganese ore a sorting method, commonly known as the manganese-rich
slag. Its essence is the use of the reduction temperature of manganese, phosphorus, iron in the blast furnace or electric furnace to control its temperature to a high
temperature for the selective separation of manganese, phosphorus, iron and sorting.
China pyrometallurgical enrichment has been nearly 40 years of history, 1959 Shaoyang, Hunan the Zijiang ironworks in the 9.4m3 small blast furnace test and preliminary
results. Subsequently, the 1962 Shanghai Ferroalloy Plant and Shijingshan Iron and Steel Plant smelting in the blast furnace manganese-rich slag. 1975 the
Hunan Agate Hill manganese blast furnace not only refining a manganese-rich slag, lead, silver, and iron (commonly known as semi-steel), while also bottom recycling and provide the basis for the
comprehensive utilization. 1980s, the production of manganese-rich slag rapid development, has developed manganese-rich slag production
Pyrometallurgical enrichment process is simple, stable production, effective separation of the ores of iron, phosphorus, and get-rich manganese, low iron, low phosphorus
manganese-rich slag, this rich manganese slag with Mn35% -45% in general, Mn/Fe12-38, P / Mn <0.002, a high quality manganese alloy materials, is also a general natural rich
manganese is difficult to achieve the three indicators of man-made bonanza. Therefore, the pyrometallurgical enrichment for our high-phosphorus iron and low manganese difficult
beneficiation in terms of promising mineral processing methods.
Chemical selected manganese France
The chemical beneficiation of manganese, China has carried out extensive research, including test more, more promising: even Kraft, black manganese France and bacterial leaching
of manganese law.
With the continuous improvement of the technological level, the manganese ore beneficiation technology also continue to develop increasingly high rate of extraction of manganese,
more and more environmentally friendly process.
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