Detailed introduction to manganese ore dressing method
The majority of manganese ores in domestic are lean ores, which are processed by mineral processing. 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 in China are mechanical separation (including ore washing, screening, gravity separation, strong magnetic separation and flotation), 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. Reselect
Gravity concentration is only used to separate manganese ores with simple structure and coarse embedded particle size, especially for manganese oxide ores with large density. Common methods include heavy medium beneficiation, jigging beneficiation and shaking table beneficiation.
At present, the process flow of treating oxidized manganese ore in domestic is generally to break the ore to 6~0mm or 10~0mm, then group it, jigging the coarse grade ore and shaking the fine grade ore. The equipment is mostly Haze reciprocating jig and 6-S shaking table.
3. High intensity magnetic separation
Manganese mineral belongs to weakly magnetic mineral [specific magnetization X=10 × 10-6～600 × 10-6cm3/g] 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 sized and fine sized high intensity magnetic separators are widely used in manganese ores in China, and the coarse and fine sized high intensity magnetic separators are also gradually applied, while the fine sized high intensity magnetic separators are still in the experimental stage.
4. 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.
5. 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 in domestic has made a big step forward.
6. Pyro 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.
Fire enrichment has been used for nearly 40 years in domestic. The process of fire enrichment is simple and stable. It can effectively separate iron and phosphorus from ores and obtain rich manganese, low iron, low phosphorus and rich manganese slag. Pyro enrichment is a promising beneficiation method for high phosphorus, high iron and low manganese refractory ores in domestic.
7. Chemical manganese separation method
There are many chemical beneficiation of manganese, and a lot of research work has been carried out in domestic , 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. At present, it has not been put into industrial production.
The above SMMVIK has explained all the methods used for manganese ore dressing in domestic , and I hope it will be helpful to you. As a supplier of mining machinery and equipment in China, SMMVIK has a full set of metal ore crushing and grinding equipment. Welcome to consult our online customer service for more information, and we will serve you wholeheartedly.