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Manganese mineral is one of the important raw materials for steel and related industries. It is also widely used in chemical industry, light industry, building materials industry, national defense industry, electronics industry and other fields. It has a very important strategic position in the national economy. There are many beneficiation methods for manganese mineral, mainly including ore washing, gravity separation, magnetic separation, flotation separation, chemical beneficiation, pyroenrichment, etc. This article will introduce these six manganese ore beneficiation methods to help you select manganese minerals.
Use the table of contents below to navigate through the guide:
Ore washing is one of the traditional beneficiation methods of manganese mineral. It is widely used in practice. It is generally used in combination with screening operations, that is, washing manganese ore directly on the vibrating screen, or using a cylinder washing machine or a trough washing machine first. Wash the ore, and then send the washed manganese ore to the vibrating screen for screening. Manganese ore often contains a lot of sediment, especially manganese oxide ore, and a certain amount of secondary slime will be produced during the beneficiation process. Ore washing can effectively reduce the sediment in manganese ore.
This method is suitable for manganese-rich ores, which can be directly smelted after washing. The ore washing method can also be used in conjunction with other beneficiation methods to avoid the influence of ore slime on the effects of other beneficiation methods, and separate the ore slime alone.
Manganese ore gravity separation generally uses equipment such as jigs and shakers to separate manganese ores. The general procedure is to group the crushed ore according to the particle size after crushing process. The coarse-grained manganese ore is processed by a jig, and the fine-grained manganese ore is processed by a shaking table. The gravity separation method is suitable for manganese ores with simple structure and coarse particle size, and also for ores with large density difference between manganese minerals and gangue minerals.
Because manganese minerals have weak magnetic properties, they can be processed by magnetic separation. Generally, strong magnetic separation process is adopted. Both wet magnetic separation and dry magnetic separation are used in manganese ore beneficiation. Permanent magnetic roller magnetic separator, permanent magnetic separator, induction roller strong magnetic separator and other equipment can be used for separation. . The magnetic field strength is the main factor affecting the recovery effect of manganese minerals, and the recovery is generally carried out under the condition of the magnetic field strength Ho=800-1600kA/m (10000-20000oe). Magnetic separation is mainly suitable for the separation of coarse, medium and fine grains of manganese oxide and manganese carbonate minerals.
The manganese ore flotation method mainly uses oleic acid, tall oil, oxidized paraffin soap and other collectors to separate manganese minerals by flotation, and the pH value is between 7 and 9. Usually, a small amount of sodium carbonate, water glass, tannin and phosphate are added to the pulp. These agents play the role of adjusting the pulp, dispersing the slime and inhibiting the gangue. The dosage should not be too large, otherwise it will easily inhibit the manganese minerals. effect. Reverse flotation is also used in manganese ore beneficiation, usually with strong magnetic separation or gravity separation to remove quartz and phosphorus-containing minerals in manganese concentrate.
Flotation is suitable for the separation of manganese minerals such as rhodochrosite and pyrolusite and fine-grained manganese minerals. For different manganese minerals, the flotation conditions and effects are slightly different, and the appropriate conditions and indicators need to be determined according to experiments.
The chemical beneficiation method is one of the methods for effectively separating manganese minerals. It mainly uses the chemical reaction of sulfur dioxide, ferrous sulfate, calcium dithionate and other agents with manganese ore to dissolve manganese minerals in the leaching solution, and then use other agents to generate manganese ore. The precipitate was filtered to obtain the manganese mineral product. This method is suitable for low-grade lean manganese ore and refractory manganese ore.
Pyro-enrichment of manganese ore is also called manganese-rich slag method. This method mainly uses the different reduction temperatures of manganese and associated phosphorus, iron and other substances, and controls its temperature in a blast furnace or an electric furnace for selective separation. This method is suitable for refractory manganese-poor ore with high content of phosphorus and iron.
The above are the six major manganese mineral beneficiation processes. In actual production, it should be noted that naturally mined manganese ore often contains various associated minerals, and comprehensive recovery should be considered. A single ore dressing method may not achieve the expected effect. The beneficiation test should be carried out, and found according to its mineral components and characteristics. Appropriate beneficiation process can avoid economic loss and waste of resources.