brazil niobium mine exploitation mining beneficiation plant, crusher grinding mill
Niobium, formerly columbium, is a chemical element with the symbol Nb (formerly Cb) and atomic number 41. It is a soft, grey, ductile transition metal, which is often found in the pyrochlore mineral, the main commercial source for niobium, and columbite.
It was not until the early 20th century that niobium was first used commercially. Brazil is the leading producer of niobium and ferroniobium, an alloy of niobium and iron. Niobium is used mostly in alloys, the largest part in special steel such as that used in gas pipelines. Although alloys contain only a maximum of 0.1%, that small percentage of niobium improves the strength of the steel. Niobium is used in various superconducting materials. These superconducting alloys, also containing titanium and tin, are widely used in the superconducting magnets of MRI scanners. Other applications of niobium include its use in welding, nuclear industries, electronics, optics, numismatics and jewelry. In the last two applications, niobium's low toxicity and ability to be colored by anodization are particular advantages.
Niobium and tantalum do not occur naturally as free metals, but are essential components in a range of mineral species. The majority of these are oxide minerals; silicates of niobium and tantalum also substitute for major ions in a number of other minerals, in which they typically have low concentrations. The vast majority of the economically important species are oxides.
Extraction methods used to extract the tantalum and niobium are similar to other comparable metal occurrence. Factors that dictate the choice of extraction methods include: physical and chemical properties of mineral ore, the tonnage and grade and type, geometry and depth of field. The most common extraction methods are surface (or open) and sub- surface (or underground) mining, or a combination of both. A significant amount of niobium and tantalum are extracted by artisanal mining and small-scale.
In recent years, several advanced technologies have been developed to improve the separation of finer materials. As a leading company in mining industry, we can supply our consumers with high-tech and high quality niobium ore beneficiation equipment. Niobium ore beneficiation equipment for Brazil has lot selectivity. Our most popular products are crushing equipment, grinding equipment, sand making equipment and separating machine. For niobium ore crushing, you can choose niobium ore jaw crusher, cone crusher, impact crusher and grinding mills such as ball mill, vertical roller mill and super thin grinding mill. For niobium ore separating, you can use our magnetic separator, flotation separator or gravity separator.
The dry Magnetic Separator of CTG type is widely used in chemical, pharmaceutical, the ceramic raw materials of iron removal and the recovery of the weak magnetic minerals. This machine is specialized in dry separating in limonite, hematite, manganese ore and the machine enjoys features of small occupied area, low power, and large treatment volume.
Shanghai SBM, a professional mining equipment manufacturer, has been dedicated in mining industry for many years. We provide professional service about niobium ore mining technology and niobium mining equipment for sale Brazil. For ore crushing, you can choose our jaw crusher, impact crusher or cone crusher. All of our crushers feature with high efficiency, energy saving, easy maintenance, low operating and maintenance cost and do on. For further grinding, you can take ball mill, super thin grinding mill and vertical roller mill as options.
Its fully-enclosed layout features high integration. It integrates the functions of high-efficiency sand making, particle shape optimization, filler content control, gradation control, water content control, and environmental protection into a single syst
chromite beneficiation process
Experience indicates that chrome ores are concentrated to best advantage by gravity methods. Since recoveries are generally very poor in the fine sizes, the gravity flowsheet must be designed to remove the chrome as soon as liberated by crushing and grinding. For example, if the chrome is not entirely freed until the ore is minus 16 mesh, it is obvious that the plus 16 mesh particles should be removed after stage crushing and grinding to prevent further reduction of the chrome and consequent loss in the fine sizes.
The crushing section for this 250 ton per day chrome mill consists of a coarse ore grizzly, a coarse ore bin with pan feeder to a 18 reduction crusher and a crusher discharge conveyor to a crushed ore bin. On this particular ore, we find that there is no chrome liberated in sizes larger than .
The 36x 8 Adjustable Stroke Ore Feeder is used to accurately control feed of crushed ore to the grinding section. Before it is fed to the 4x 8 Peripheral Discharge Rod Mill, the minus chrome ore is removed from the grinding circuit by means of a 4x 12 Dillon Vibrating Screen. This minus product is then ready for concentration in the Mineral Jigs.
The Vibrating Screen oversize is ground in the Steel Head Rod Mill. A rod mill with the peripheral discharge feature is preferred for this application because the rapid-pass design produces a minimum of the undesirable fines. The discharge from the rod mill returns to the Dillon Vibrating Screen by means of a Belt Bucket Elevator, so that a closed circuit grinding arrangement is obtained.
The minus undersize from the Vibrating Screen is divided to feed two identical, parallel jigging circuits, each consisting of l6x 24 Duplex Mineral Jig used for roughing and a I6x 24 Duplex Mineral Jig used as a scavenger. Automatic Density Discharge Control Valves on the hutches of the scavenger Mineral Jig provide a controlled, continuous, high-density feed to a l6x 24 Duplex Mineral Jig used for final cleaning.
A final, cleaned concentrate is produced by the two cleaner Mineral Jigs and also a middling product which is re-circulated back to the scavenger jigs. This procedure is preferable to the immediate regrinding of the middlings as it avoids the further reduction of relatively pure chrome particles which are bound to be present.
The tailing from the scavenger Mineral Jig is directed to a 30x 13 Simplex Cross-Flow Classifier which discards a waste product as a final tailing at minus 65 mesh and the sand product is returned to the rod mill for further grinding. A SRL Sand Pump is used to pump the Mineral Jig Tailings to the Cross-Flow Classifier.
This flowsheet is very effective due to the ability to remove the high grade chrome with very littlegrinding on each pass through the mill. In this way, grinding takes place with a large number of small reductions followed byimmediate removal of the liberated chrome into a high grade concentrate.
In the concentration of certain chrome ores, high grade chrome particles are sometimes liberated at sizes larger than , For the concentration of these large size chrome particles, the Improved Harz Type Jig is indicated.
In the flowsheet described here, there is a minimum amount of valuable chrome in the classifier overflow and accordingly this product is sent to waste. However, conditions may justify the installation of slime concentrating tables and Tilting Concentrators.
sbm mining machinery works well for chrome, gold, asbestos processing
Brazil is one of the world's resource-rich countries and has 29 kinds of mineral reserves in the world. Nickel reserves is account 98% for the world's total reserves and the manganese, bauxite, lead, tin and other metal reserves account for over 10% of the world's total reserves. There is also a wealth of gold mine, chrome ore, asbestos mine.
The gold mine in Brazil is 200t, account 2.0% for the world's gold reserves. Brazilian gold placer almost distributes throughout the country and the most important origin is concentrated in the Amazon region. Brazil is a major asbestos mine producer in Latin America. The company SAMA is the major producers of asbestos in the country. The asbestos production in 2002 was 209,000 t, unchanged from 2001. SAMA produces more than 70% of asbestos consumption in the country, for the production of asbestos cement, most of the rest are exported to Latin American countries.
In Brazil, if the rich resources used in production, it will greatly promote the development and advancement of the national economy and domestic industry. Shanghai SBM is a world-renowned company which is professional in the production of mining machinery. Our company integrates contrivance, production and sales.
In the 20 years, SBM has been focused on the processing state mining crushing and milling equipment industry. In Brazil, we also established branch offices and provide various mining machinery and the auxiliary equipment all the year round.
Combined with Brazilian ore resources, SBM designed the hard ore production line. The production line mainly include: jaw crusher, impact crusher, cone crusher, vibrating feeder, circular vibrating screen, conveyor belts.
The production line is consist of various equipment with high performance and the production capacity between the various devices of mutual cooperation, functional, safe and reliable, convergence close , run smoothly. Therefore, it can ensure the continuous production at the same speed and achieve the purpose of energy-efficient. Meanwhile, the entire line is compact, so as to effectively serve our customers save space, the lowest cost.
Hard ore production line is mainly used for processing the material which Mohs hardness is more than 7, such as: chromium ore, quartz, topaz, corundum, and silicon carbide. In the crushing process, we can also have a variety of optional auxiliary equipment, such as: belt conveyor, processing machines and all kinds of dust reduction equipment. If the ore is too hard, we can choose the sand making machine, sand washing machine, to process the material into sand and then meet further use. SBM can configure the production line with different ore production capacity according to the customer's material situation, so as to achieve energy efficient, economical and practical purposes.
The medium hard ore production line mainly include: vibrating feeder, jaw crusher, impact crusher, circular vibrating screen, grinding mill, dressing equipment and so on. All the equipment is high performance, easy to maintenance, safe and reliable, convergence close and run smoothly. It can continuous production at least one month, the production capacity is stability. Quality equipment also makes litter parts wear, so dose the low maintenance costs.
The medium hard ore production line is mainly used for processing the material which Mohs hardness is between2-5, such as: gypsum, gold mine, silver, copper, aluminum, calcite, and fluorite, asbestos mine and so on. According to our different needs, we can choose different devices for processing. Depending on the application of the medium hard materials, the material which needs to be processed into construction aggregate can use various crushers for crushing. For the material which needs to be processed into powder in industrial production, we can choose the grinding mills to process. According to different fineness, the different mills like Vertical grinding mills, ultrafine mill, Raymond mill, Trapezium grinder can be choose.
In Brazil, SBM already has a high popularity in terms of resource utilization. With high-quality equipment and high-quality services like, pre-sales consulting, in-sales explains, after-sales training, maintenance and so on, SBM mining machinery has a high market share in Brazil. Brazil is rich in variety of mineral resources. The various mining ore solutions made by SBM not only meet the ore processing needs, to some extent, but also extend the application of the ore.