The majority of manganese ores are lean ores and need to be beneficiated. However, because most manganese ores are fine or embedded with fine particles, and there are a considerable number of high phosphate ores, high iron ores and co (concomitant) beneficial metals, it is very difficult to beneficiate.
The commonly used manganese ore dressing methods are mechanical separation (including ore washing, screening, gravity separation, strong magnetic separation and flotation), as well as fire enrichment, chemical beneficiation, etc.
1. Ore washing and screening.
Ore washing is to separate ore from mud by hydraulic flushing or additional mechanical scrubbing. Common equipment includes ore washing screen, drum ore washing machine and trough ore washing machine.
The ore washing operation is often accompanied by screening, such as washing directly on the vibrating screen or sending the ore sand (clean ore) obtained by the ore washing machine to the vibrating screen for screening. Screening can be used as a vertical operation to separate products with different particle sizes and grades for different purposes.
2. High intensity magnetic separation.
Manganese mineral belongs to weakly magnetic mineral can be recovered in the high magnetic field separator with the magnetic field strength Ho=800 - 1600kA/m (10000-20000oe), and the manganese grade can generally be improved by 4%-10%.
Because of the simple operation, easy control and strong adaptability of magnetic separation, it can be used for the separation of various manganese ores, and manganese ore dressing plays a leading role. Medium and fine high intensity magnetic separators are widely used in manganese ores, and coarse and fine high intensity magnetic separators are also gradually applied, while micro and fine high intensity magnetic separators are still in the experimental stage.
3. Gravity magnetic separation.
Taking the Liancheng Manganese Mine Heavy Magnetic Separation Plant as an example, it mainly deals with leached manganese oxide ores. The AM-30 jig is used to treat 30-3mm washed ores. A high-quality manganese concentrate containing more than 40% manganese can be obtained, which can be used as the raw material of battery manganese powder after manual separation and impurity removal. After jigging tailings and washed ore less than 3mm are milled to less than 1m, the manganese concentrate grade will be increased by 24%-25% to 36%-40% by using high intensity magnetic separator.
4. Strong magnetic flotation.
Taking Zunyi manganese ore as an example, the ore is low manganese, low phosphorus and high iron manganese ore mainly composed of manganese carbonate ore. The shp-2000 type high intensity magnetic separator is used for high intensity magnetic separation, and the CHF type inflatable flotation machine is mainly used for flotation machine.
After years of production tests, it has good performance and is very suitable for Zunyi manganese ore dressing application. The successful test of strong magnetic flotation process flow and its application in production indicate that the deep separation of manganese ore has made a big step forward.
5. Fire enrichment.
Enrichment of manganese ore by fire is a separation method for treating refractory and poor manganese ore with high phosphorus and high iron, which is generally called rich manganese slag method. Its essence is a high temperature separation method of selectively separating manganese, phosphorus and iron by controlling their temperature in blast furnace or electric furnace based on different reduction temperatures of manganese, phosphorus and iron.
Pyro enrichment has been used for many years. The process is simple and stable. It can effectively separate iron and phosphorus from ores to obtain manganese rich, low iron, low phosphorus and manganese rich slag. Pyro enrichment is a promising beneficiation method for high phosphorus, high iron and low manganese refractory ores.
6. Chemical manganese separation method.
There are a lot of chemical beneficiation of manganese, and we have carried out a lot of research work, among which there are many tests. The more promising ones are the dithiosulfate method, the black manganese ore method and the bacterial manganese leaching method.
SMMVIK Machinery has explained all the methods used for manganese ore beneficiation, and I hope it will be helpful to you. As a supplier of mining machinery and equipment, SMMVIK Machinery has a full set of metal ore crushing and grinding equipment. Welcome to consult our customer service for more details, and we will serve you wholeheartedly.
