Manganese ore production process

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Manganese ore production process

The whole production and processing process of manganese ore is divided into four steps: crushing and screening, milling and sorting, magnetic separation and drying.

  • 1. Crushing and screening: The natural manganese ore is sent to the jaw crusher by the vibrating feeder to be coarsely broken. The coarsely broken manganese ore is sieved by the vibrating sieve and does not meet the requirements. If it meets the requirements, it will be sent to the horizontal bar hydraulic cone crusher for medium breakage. The broken manganese ore is sent to the multi-cylinder hydraulic cone crusher for fine breakage. The finely crushed manganese ore is sieved by the vibrating screen, and the unqualified one is sent. The multi-cylinder hydraulic cone crusher continues to be crushed, and the qualified manganese ore enters the next step.
  • 2. Milling and sorting: 0-12mm manganese ore powder sieved by vibrating screen is uniformly sent to the ball mill for grinding, and then classified by a spiral classifier. Unqualified is sent to the ball mill to continue grinding, qualified manganese ore powder. Go to the next step.
  • 3. Magnetic separation: The qualified manganese ore powder below 3mm is sent to two magnetic separators for coarse magnetic separation and fine magnetic separation to remove impurities to obtain manganese ore powder.
  • 4. Drying: The manganese powder is obtained by feeding the manganese powder into the dryer for drying.


Advantages of manganese ore production process

  • 1. Low failure rate: There are many screening equipments in the manganese ore production process, which control the feeding granularity of each crushing equipment and grinding equipment, so as to ensure the normal operation of the whole production line, and the wear speed and failure of each equipment. The rate is reduced;
  • 2, high efficiency and energy saving: the entire production line is ancillary equipment, each equipment can play a good state, production speed is fast, consume less energy, which can reduce the post-production costs;
  • 3. Good product quality: The magnetic separator used in the production line has good performance. The products produced have high manganese content, excellent quality and strong market competitiveness.

What are the common selection processes for manganese ore?

Manganese is an important metal and is widely used in industry. More than 90% of the world’s manganese ore reserves are concentrated in South Africa, the former Soviet Union, Australia, Gabon, Brazil and India. China’s manganese ore reserves are abundant and rank among the top in the world. Manganese ore is divided into two major categories: carbonate manganese ore and manganese oxide ore according to its natural type. China has more manganese ore carbonates, accounting for 57% of the total reserves of manganese ore.

At present, manganese ore beneficiation methods are re-elected (mainly jigging, shaker selection), heavy medium-strong magnetic separation, roasting-strong magnetic separation, single strong magnetic separation, flotation, and combined beneficiation methods including several methods. Manganese minerals are weak magnetic minerals, which have a large difference in magnetic susceptibility and gangue minerals. Therefore, strong magnetic separation of manganese ore occupies an important position.

    • 1. Beneficiation method of manganese carbonate ore

The main minerals in manganese carbonate ore are rhodochrosite, calcium rhodochrosite, manganese calcite and rhodochrosite; gangue minerals are silicate and carbonate minerals, often accompanied by impurities such as sulfur and iron.

Most of the manganese carbonate ore beneficiation methods use strong magnetic separation, heavy medium ore dressing and flotation.

Sedimentary sulphur-containing carbonic acid, manganese ore generally uses a sequential preferential flotation process of carbonaceous shale, pyrite and manganese minerals.

The hydrothermal lead-containing zinc manganese carbonate ore generally adopts a flotation-strong magnetic separation process.

Some sulfur-rich manganese ore, manganese minerals are mainly sulphur-manganese ore, generally using roasting method to remove sulfur.

Some carbon-rich manganese carbonate ore is also produced by roasting to remove volatile components to obtain a finished ore.

Manganese carbonate ore contains some refractory ore. Manganese is closely symbiotic with iron, phosphorus or gangue. The size of the clamp cloth is very fine and difficult to sort. It can be treated by smelting method. For example, a manganese-rich slag method for treating high-phosphorus high-iron manganese ore, a nitric acid leaching method for producing active manganese dioxide, and an electrolytic method for producing metal manganese have been applied to industrial production. In addition, there are calcium disulfate method and bacterial leaching method.

    • 2. Beneficiation method of manganese oxide ore

Manganese minerals in manganese oxide ore are mainly hard manganese ore, pyrolusite and manganese ore. The gangue minerals are mainly silicate minerals and carbonate minerals, often accompanied by iron, phosphorus, nickel and cobalt. The ore dressing method of manganese oxide ore is mainly based on re-election.

Weathered manganese oxide ore often contains a large amount of slime and fine ore, and the washing and re-election method is adopted in production. The ore is washed ore to remove the net ore from the slime, and some can be used as finished ore, and some need to be selected by jigging and shaker.

Washing overflows sometimes require further recovery by re-election or strong magnetic separation.

Some sedimentary primary manganese oxide ore, due to the depletion of mining, the use of heavy medium and jigging to remove gangue, to obtain lump ore concentrate.

Among the iron-containing manganese oxide ores, the iron mineral is mainly limonite. Iron and manganese are difficult to separate by re-election, flotation or strong magnetic separation, and a reduction roasting magnetic separation method is required. A washing-reduction roasting magnetic separation-re-election process has been employed in the industry.


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