Manganese Ore Beneficiation Technology And Beneficiation Technology
Brief introduction of manganese ore dressing technology
The vast majority of manganese ore in my country are poor ore and must be processed. However, because most manganese ores are fine-grained or fine-grained, and there are a considerable amount of high phosphate ore, high iron ore and co- (associated) beneficial metals, it brings great difficulty to the processing of ore. At present, the commonly used manganese ore beneficiation methods are mechanical separation (including ore washing, screening, gravity separation, strong magnetic separation and flotation), as well as pyroconcentration and chemical beneficiation methods.
1. Ore washing and screening
Washing is the use of hydraulic washing or additional mechanical scrubbing to separate the ore from the mud. Commonly used equipment is ore washing screen, cylinder washing machine and trough washing machine. Washing operations are often accompanied by screening, such as washing directly on the vibrating screen or sending the ore (clean ore) obtained by the washing machine to the vibrating screen for screening. Screening can be used as an independent operation to separate products of different particle sizes and grades for different purposes.
At present, gravity separation is only used to separate manganese ore with simple structure and coarser grain size, and is especially suitable for manganese oxide ore with higher density. Commonly used methods are heavy medium beneficiation, jig beneficiation and shaker beneficiation. The current process of processing manganese oxide ore in my country is generally to crush the ore to 6 to 0 mm or 10 to 0 mm, and then group the ore, jigging for the coarse level, and sending it to a shaker for the fine level. The equipment is mostly Haz-type reciprocating jig and 6-S-type shaker.
3. Strong magnetic separation
Manganese minerals are weakly magnetic minerals [specific magnetic susceptibility X = 10×10-6～600×10-6cm3/g], which can be used in a strong magnetic separator with a magnetic field intensity of Ho=800～1600kA/m (1,000～2,000oe) Recycling can generally increase the manganese grade by 4% to 10%.
Because of its simple operation, easy control, and strong adaptability, magnetic separation can be used for the separation of various manganese ore, and has taken a dominant position in manganese ore beneficiation in recent years. Various new types of coarse, medium and fine-grained strong magnetic machines have been successfully developed. At present, the most common application of domestic manganese ore is the medium-grain strong magnetic separator. Coarse and fine-grain strong magnetic separators are gradually being used. The fine-grain strong magnetic separator is still in the experimental stage.
4. Heavy-magnetic separation
At present, domestic heavy-magnetic separation plants that have been newly built or rebuilt include Fujian Liancheng, Guangxi Leading, Jingxi and Xialei manganese mines. For example, the Liancheng Manganese Mine Heavy-Magnetic Separation Plant mainly processes leaching manganese oxide ore. The AM-30 jig machine is used to process 30~3mm washed ore to obtain high-quality manganese concentrate containing more than 40% manganese. After selecting and removing impurities, it can be used as raw material for battery manganese powder. After the jig tailings and the cleaned ore diameter less than 3mm are ground to less than 1m, the manganese concentrate grade should be increased by 24% to 25%, reaching 36% to 40%.
5. Strong magnetic-flotation
Currently, only Zunyi manganese ore is used in the strong magnetic-flotation process. The ore is a low-manganese, low-phosphorus and high-iron manganese ore based on manganese carbonate ore. According to industrial tests, the grinding process adopts rod mill-ball mill stage grinding, and the equipment scale is φ2100mm×3000mm wet grinding machine. The strong magnetic separation adopts the shp-2000 strong magnetic machine, and the flotation machine mainly uses the CHF inflatable flotation machine. After years of production test, it has good performance and is very suitable for Zunyi manganese beneficiation application. The successful test of the strong magnetic-flotation process and its application in production indicate that the deep separation of manganese ore in my country has taken a big step forward.
6. Fire enrichment
Pyroconcentration of manganese ore is a sorting method for processing high-phosphorus, high-iron, and difficult-to-select poor manganese ore, generally called manganese-rich slag method. Its essence is a high-temperature separation method that uses different reduction temperatures of manganese, phosphorus, and iron to control the temperature in a blast furnace or electric furnace to selectively separate manganese, phosphorus, and iron. my country has adopted pyroconcentration for nearly 40 years. In 1959, Hunan Shaoyang Zijiang Iron Works conducted tests on a 9.4m3 small blast furnace and obtained preliminary results. Subsequently, in 1962 Shanghai Ferroalloy Plant and Shijingshan Iron and Steel Plant smelted manganese-rich slag in blast furnaces. In 1975, the manganese-rich manganese slag was not only smelted from the manganese-rich slag in Hunan Manaoshan Manganese Mine, but also lead, silver and pig iron (commonly known as semi-steel) were recovered at the bottom of the furnace to provide a basis for comprehensive utilization. Since the 1980s, the production of manganese-rich slag has developed rapidly, and the production of manganese-rich slag has been developed in Hunan, Hubei, Guangdong, Guangxi, Jiangxi, Liaoning, Jilin and other places. The pyro-enrichment process is simple and stable in production. It can effectively separate iron and phosphorus from the ore to obtain manganese-rich, low-iron, and low-phosphorus manganese-rich slag. This manganese-rich slag generally contains Mn 35% to 45%. Mn/Fe 12～38, P/Mn<0.002, is a high-quality manganese alloy raw material, and it is also an artificial rich ore that is difficult for ordinary natural manganese ore to achieve the above three indicators at the same time. Therefore, pyro-enrichment is a promising method for beneficiation of high-phosphorus, high-iron and low-manganese refractory ore in my country.
7. Chemical selection of manganese
There are many chemical beneficiation methods for manganese. A lot of research work has been carried out in our country. Among them, there are many tests and the promising ones are: dithionite method, black manganese ore method and bacterial manganese leaching method. It has not yet been put into industrial production.