With its various valence states and excellent physical and chemical properties, manganese has been widely used in steel, metallurgy, machinery and other modern industrial fields. With the gradual shortage of manganese resources, it is imperative to improve the recovery of manganese in raw materials. Manganese carbonate is one of the main raw materials for recovering manganese. At present, the beneficiation processes of manganese carbonate mainly include ore washing, gravity separation, magnetic separation, flotation, leaching and combined processes. The following will introduce these beneficiation methods of manganese carbonate.
Ore washing is a process of removing the slime on the ore surface by means of hydraulic or mechanical force. It is the preparation work before ore crushing or separation. Its purpose is to improve the grade of selected minerals and reduce the impact of slime on subsequent operations. Because manganese carbonate ore is brittle, easy to be argillated and coexisting with clay minerals, ore washing is generally required before separation. Ore washing is generally set after the coarse crushing of ore, which can avoid the problems of material agglomeration in the crushing bin and material blockage in the fine crusher. Generally, there are hydraulic ore washing screen, vibrating screen, cylinder ore washing machine and trough ore washing machine.
The principle of gravity separation is that different mineral particles have different densities and fall at different speeds in the medium, which can be separated by density. Gravity separation has the characteristics of low cost, wide particle size and low pollution. Generally, manganese carbonate mineral density is high, and its associated gangue mineral density is low, so gravity separation technology can be used for separation. For carbonate minerals such as calcium-rhodochrosite and manganese calcite, heavy media hydrocyclones can be used for classification. The products after classification enter the jig for gravity separation after ore washing. However, sometimes a single gravity separation process cannot obtain satisfactory beneficiation indexes, and other processes need to be combined, such as magnetic separation and flotation. The equipment that can be used for gravity separation includes heavy medium separator, shaking table, jig, spiral chute, cyclone and centrifuge.
Manganese carbonate has weak magnetism, while the associated gangue minerals are mostly non-magnetic silicate minerals. Therefore, high intensity magnetic separation can be used to enrich manganese carbonate. Magnetic separation has the advantages of small land occupation, low energy consumption, low cost and economic and environmental protection. The same magnetic separation method can be used for different types of manganese carbonate ores. For example, wet weak magnetic separation can be used for rough separation of high-iron manganese carbonate ores, and then high gradient high intensity magnetic separation can be carried out for the coarse concentrate to separate the target minerals iron and manganese. When processing high-sulfur carbonate ore, the main gangue minerals are dolomite, pyrite, etc. The high intensity magnetic separation process will obtain better beneficiation indexes. When processing low-grade manganese carbonate ore, a high-gradient magnetic separator can be used to carry out the beneficiation process of one coarse and one sweep. Generally, there are dry magnetic separators, wet magnetic separators and high gradient magnetic separators.
Manganese carbonate ore is associated with many gangue with complex composition, and its embedded particle size is relatively fine, so flotation process can be selected. The flotation process can effectively enrich fine manganese carbonate. Generally, positive flotation is used to treat manganese carbonate. In the flotation of manganese carbonate ore, the combination of reagents is generally used, which can make targeted use of the different characteristics of drugs and improve the flotation index on the basis of clear target minerals and gangue minerals.
Leaching mainly uses chemical methods to change the properties of minerals, so as to carry out comprehensive recovery and utilization of minerals. The leaching process of manganese carbonate mainly includes pre-roasting leaching, direct acid leaching and microbial leaching.
Pre-baking leaching: It is mainly used for the recovery of high-valent manganese resources. Its principle is to reduce the high-valent manganese to low-valent manganese, and then recover the manganese in the state of ion during the leaching process.
Direct acid leaching: the process of acid directly acting on manganese carbonate ore and then leaching manganese. During direct acid leaching, attention should be paid to the temperature, solid-liquid ratio, acid leaching time and stirring strength.
Microbial leaching: microorganisms directly or indirectly act on the target minerals to improve the recovery effect of the target minerals.
For the development and utilization of lean manganese carbonate ore, the requirements of beneficiation technology are higher. Sometimes a single beneficiation process can not obtain a good concentrate index. At this time, it is necessary to adopt multiple beneficiation processes for joint separation. When the crystalline size of manganese minerals is fine and closely associated with gangue minerals, magnetic separation-flotation separation process can be selected. After flotation, sulfuric acid leaching of the concentrate can improve the total recovery of manganese. If the raw ore is a high-carbonate manganese ore, the combined process of magnetic separation-flotation can be adopted according to the magnetic and floatability differences between the target minerals and gangue minerals. The combined beneficiation process can realize the complementary advantages of multiple single beneficiation processes and improve the comprehensive beneficiation index. In addition, the combined process can also improve the recovery and utilization of associated useful minerals and improve the utilization rate of resources.
The above is the introduction of six common manganese carbonate beneficiation processes. In the actual beneficiation plant, different beneficiation processes should be adopted according to different ore properties. Xinhai Ore Loading suggests that the ore should be analyzed before determining the beneficiation process, and the appropriate beneficiation process of manganese carbonate ore can be determined according to the experimental results. Xinhai Mineral Equipment can customize the manganese ore beneficiation process for you, provide a complete set of beneficiation equipment and subsequent equipment installation and use training. If necessary, please consult.
