Manganese ore dressing technology

Introduction of manganese ore processing technology:

At present, the commonly used methods of manganese ore dressing are mechanical dressing (including washing, screening, gravity dressing, strong magnetic dressing and flotation), as well as fire concentration, chemical dressing and so on.

1. Washing and screening:

Ore washing is the use of hydraulic flushing or additional mechanical scrubbing to separate ore from shale.Commonly used equipment is 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 washing machine obtained ore (clean ore) sent to the vibrating screen screening.Screening can be used as an independent operation, separate different particle size and grade of products for different purposes.

2. Gravity separation:

At present, it is only used for the separation of manganese ores with simple structure and coarse grain size, especially for the manganese oxide ores with high density.The common methods are heavy medium dressing, jigging dressing and table dressing. At present, the process flow of China's treatment of manganese oxide ore is generally broken to 6 ~ 0mm or 10 ~ 0mm, and then divided into groups, coarse grade for jigging, fine grade for table selection.The equipment is mainly hazi-type reciprocating jig and 6-s shaking table.

3. Strong magnetic concentration:

Manganese mineral belongs to weak magnetic mineral (specific magnetization coefficient X = 10 X 10-6 ~ 600 X 10-6cm3/g), which can be recovered in the strong magnetic field separator with magnetic field intensity Ho = 800 ~ 1600kA/m (10000 ~ 20000oe), and can generally improve manganese grade by 4% ~ 10%. Because magnetic separation operation is simple, easy to control, strong adaptability, can be used for a variety of manganese ore separation, in recent years has been in the dominant position in manganese ore separation.Various new types of coarse, medium and fine magnetic machines have been developed successfully.At present, the most common domestic application of manganese ore is medium grain strong magnetic separator, coarse and fine grain strong magnetic separator is also gradually applied, fine grain strong magnetic separator is still in the experimental stage.

4. Gravity-magnetic separation:

At present, China has built and rebuilt the heavy - magnetic separation plant in liancheng, fujian, guangxi, jingxi and xialei manganese ore.Such as liancheng manganese ore heavy - magnetic separation plant, the main treatment leaching type of manganese oxide ore, the use of AM-30 jig treatment of 30 ~ 3mm clean ore, can get higher than 40% manganese content of high quality manganese concentrate, and then by hand to remove impurity, can be used as raw materials for batteries manganese powder.After the jigging tailings and washing ore diameter of less than 3mm are ground to less than 1m, the manganese concentrate grade should be improved by 24% ~ 25% and up to 36% ~ 40% by using strong magnetic separator.

5. High intensity magnetic - flotation:

At present, only zunyi manganese ore is used in high intensity magnetic - flotation process.The ore is based on carbonate manganese ore, low manganese, low phosphorus, high iron manganese ore.16. According to industrial tests, the grinding process USES a rod grinding - ball grinding stage grinding, equipment size is 2100mm x 3000mm wet grinding machine.SHP -2000 strong magnetic separation machine, flotation machine mainly used CHF inflatable flotation machine.After years of production test, good performance, very suitable for zunyi manganese dressing application.The successful experiment of high intensity magnetic flotation process and its application in production indicate that the deep separation of manganese ore in China has made a great step forward.

6. Enrichment by fire:

Pyrolysis enrichment of manganese ore is a separation method for treating high phosphorus and high iron refractory poor manganese ore.Its essence is a kind of high temperature separation method which can selectively separate manganese, phosphorus and iron by controlling the temperature of reduction of manganese, phosphorus and iron in blast furnace or electric furnace.

It has been nearly 40 years since fire enrichment was used in China. In 1959, a test was carried out on a 9.4m3 small blast furnace in hunan shaoyang zijiang iron works, and preliminary results were obtained.Subsequently, in 1962, rich manganese slag was smelted in blast furnace by Shanghai ferroalloy plant and shijingshan steel plant.In 1975, the blast furnace of manaoshan manganese mine in hunan not only produced manganese rich slag, but also recovered lead, silver and pig iron (commonly known as semi-steel) at the bottom of the furnace, providing a basis for comprehensive utilization.Since the 1980s, the production of manganese rich slag has developed rapidly, and has developed in hunan, hubei, guangdong, guangxi, jiangxi, liaoning, jilin and other places.

Enrichment process method is simple, steady production, can effectively separate the ore of iron, phosphorus, and get rich, low iron, low phosphorus rich manganese slag, this kind of rich manganese slag containing Mn35 % ~ 45%, 12 ~ 38, Mn/Fe/Mn P < 0.002, is a high-quality manganese alloy materials, is also the general natural rich manganese ore difficult to simultaneously achieve the above three indicators of synthetic diamond.Therefore, fire concentration is a promising method for refractory ore dressing of high phosphorus, high iron and low manganese in China.

7. Chemical manganese separation process

There are many chemical ore dressing methods for manganese, and a lot of research work has been done in our country.It has not yet been put into industrial production.