Misplaced Pages

#205794

64-421: Originally, raw uranium ore was extracted by traditional mining, and this is still the case in many mines. It is first crushed to a fine powder by passing it through crushers and grinders to produce "pulped" ore. This is further processed with concentrated acid , alkaline , or peroxide solutions to leach out the uranium. However, nearly half of yellowcake production is now produced by in situ leaching in which

128-416: A stream of particles past a charged anode. The conductors lose electrons to the plate and are pulled away from the other particles due to the induced attraction to the anode. These separators are used for particles between 75 and 250 micron and for efficient separation to occur, the particles need to be dry, have a close size distribution and uniform in shape. Of these considerations, one of the most important

192-436: A day. This process of separating magnetic substances from the non-magnetic substances in a mixture with the help of a magnet is called magnetic separation.. This process operates by moving particles in a magnetic field. The force experienced in the magnetic field is given by the equation f=m/k.H.dh/dx. with k=magnetic susceptibility, H-magnetic field strength, and dh/dx being the magnetic field gradient. As seen in this equation,

256-492: A decline in its use since the introduction of methods like flotation, classification, magnetic separation and leaching. Gravity separation dates back to at least 3000 BC when Egyptians used the technique for separation of gold. It is necessary to determine the suitability of a gravity concentration process before it is employed for concentration of an ore. The concentration criterion is commonly used for this purpose, designated C C {\displaystyle CC} in

320-600: A hazardous cargo for shipping by the International Maritime Solid Bulk Cargoes (IMSBC) Code, which is part of the SOLAS Convention , due to their tendency under certain conditions, to liquefy, which may affect the stability of the ship due to the free surface effect potentially causing a ship to capsize . Special measures are required by the code in order to safely transport concentrates. This article about mining

384-482: A number of cells able to be used for the flotation of minerals. these include flotation columns and mechanical flotation cells. The flotation columns are used for finer minerals and typically have a higher grade and lower recovery of minerals than mechanical flotation cells. The cells in use at the moment can exceed 300 m . This is done as they are cheaper per unit volume than smaller cells, but they are not able to be controlled as easily as smaller cells. This process

448-411: A variety of mediums. These include, organic liquids, aqueous solutions or suspensions of very fine particles in water or air. The organic liquids are typically not used due to their toxicity, difficulties in handling and relative cost. Industrially, the most common dense media is a suspension of fine magnetite and/or ferrosilicon particles. An aqueous solution as a dense medium is used in coal processing in

512-570: Is a very tedious process, particularly when the individual particles are small. Another comparatively simple method relies on the various minerals having different densities , causing them to collect in different places: metallic minerals (being heavier) will drop out of suspension more quickly than lighter ones, which will be carried further by a stream of water. The process of panning and sifting for gold uses both of these methods. Various devices known as 'bundles' were used to take advantage of this property. Later, more advanced machines were used such as

576-430: Is almost exclusively (>99%) U-238 , with very low radioactivity. U-238 has a half-life of 4.468 billion years and emits radiation at a slow rate. This stage of processing is before the more radioactive U-235 is concentrated, so by definition, this stage of uranium has the same radioactivity as it did in nature when it was underground, as the proportions of isotopes are at their native relative concentration. Yellowcake

640-565: Is attracted to a magnet. In mines where wolframite was mixed with cassiterite , such as South Crofty and East Pool mine in Cornwall or with bismuth such as at the Shepherd and Murphy mine in Moina, Tasmania, magnetic separation was used to separate the ores. At these mines a device called a Wetherill's Magnetic Separator (invented by John Price Wetherill, 1844–1906)[1] was used. In this machine

704-413: Is hazardous when inhaled. Mineral processing Mineral processing is the process of separating commercially valuable minerals from their ores in the field of extractive metallurgy . Depending on the processes used in each instance, it is often referred to as ore dressing or ore milling . Beneficiation is any process that improves (benefits) the economic value of the ore by removing

SECTION 10

#1732781113206

768-537: Is particle size reduction of materials. Comminution may be carried out on either dry materials or slurries. Crushing and grinding are the two primary comminution processes. Crushing is normally carried out on run-of-mine ore, while grinding (normally carried out after crushing) may be conducted on dry or slurried material. In comminution, the size reduction of particles is done by three types of forces: compression, impact and attrition. Compression and impact forces are extensively used in crushing operations while attrition

832-487: Is produced by all countries in which uranium ore is mined. Yellowcake is used in the preparation of uranium fuel for nuclear reactors , for which it is smelted into purified UO 2 for use in fuel rods for pressurized heavy-water reactors and other systems that use natural unenriched uranium . Purified uranium can also be enriched into the isotope U-235 . In this process, the uranium oxides are combined with fluorine to form uranium hexafluoride gas (UF 6 ). Next,

896-578: Is the CRL processing plant at Pinkenba in Brisbane Queensland. In this plant, zircon , rutile and ilmenite are separated from the silica gangue. In this plant, the separation is performed in a number of stages with roughers, cleaners, scavengers and recleaners. Magnetic separation is a process in which magnetically susceptible material is extracted from a mixture using a magnetic force. This separation technique can be useful in mining iron as it

960-412: Is the collector. This chemical binds to the surface of the particles as it is a surfactant . The main considerations in this chemical is the nature of the head group and the size of the hydrocarbon chain. The hydrocarbon tail needs to be short to maximize the selectivity of the desired mineral and the headgroup dictates which minerals it attaches to. The frothers are another important chemical addition to

1024-405: Is the dominant force in grinding. The primarily used equipment in crushing are jaw crushers, gyratory crushers and cone crushers whereas rod mills and ball mills , usually closed circuited with a classifier unit, are generally employed for grinding purposes in a mineral processing plant. Crushing is a dry process whereas grinding is generally performed wet and hence is more energy intensive. Sizing

1088-425: Is the general term for separation of particles according to their size. The simplest sizing process is screening, or passing the particles to be sized through a screen or number of screens. Screening equipment can include grizzlies, bar screens, wedge wire screens, radial sieves, banana screens, multi-deck screens, vibratory screen, fine screens, flip flop screens, and wire mesh screens. Screens can be static (typically

1152-400: Is the magnitude of the driving force for the separation. Multi-G processes allow the separation of very fine particles to occur (in the range of 5 to 50 micron) by increasing the driving force of separation in order to increase the rate at which particles separate. In general, single G process are only capable of processing particles that are greater than approximately 80 micron in diameter. Of

1216-557: Is the original form of smelting and allowed people to make fires hot enough to melt oxides into a liquid that separates from the iron. Although the bloomery was promptly phased out by the invention of the blast furnace , it was still heavily relied on in Africa and Europe until the early part of the second millennium. The blast furnace was the next step in smelting iron which produced pig iron . The first blast furnaces in Europe appeared in

1280-443: Is the product generally produced by metal ore mines . The raw ore is usually ground finely in various comminution operations and gangue (waste) is removed, thus concentrating the metal component. The concentrate is then transported to various physical or chemical processes called hydrometallurgy , pyrometallurgy smelters , and electrometallurgy where it is used to produce useful metals. Ore concentrates are classified as

1344-436: Is the separation of two or more minerals of different specific gravity by their relative movement in response to the force of gravity and one or more other forces (such as centrifugal forces, magnetic forces, buoyant forces), one of which is resistance to motion (drag force) by a viscous medium such as heavy media, water or, less commonly, air. Gravity separation is one of the oldest technique in mineral processing but has seen

SECTION 20

#1732781113206

1408-527: Is the water content of the particles. This is important as a layer of moisture on the particles will render the non-conductors as conductors as the layer of the water is conductive. Electrostatic plate separators are usually used for streams that have small conductors and coarse non-conductors. The high tension rollers are usually used for streams that have coarse conductors and fine non-conductors. These separators are commonly used for separating mineral sands , an example of one of these mineral processing plants

1472-561: Is to remove water absorbed by the particles which increases the pulp density. This is done for a number of reasons, specifically, to enable ore handling and concentrates to be transported easily, allow further processing to occur and to dispose of the gangue. The water extracted from the ore by dewatering is recirculated for plant operations after being sent to a water treatment plant. The main processes that are used in dewatering include dewatering screens, sedimentation, filtering, and thermal drying. These processes increase in difficulty and cost as

1536-492: Is used to separate magnetic gangue from the desired ore, or conversely to remove a magnetic target ore from nonmagnetic gangue. DMS is also considered a physical separation. Some ore physical properties can not be relied on for separation, therefore chemical processes are used to separate the ores from the rock. Froth flotation , leaching , and electrowinning are the most common types of chemical separation. Froth flotation uses hydrophobic and hydrophilic properties to separate

1600-469: The Frue vanner , invented in 1874. Other equipment used historically includes the hutch, a trough used with some ore-dressing machines and the keeve or kieve, a large tub used for differential settlement. Beneficiation can begin within the mine itself. Most mines will have a crusher within the mine itself where separation of ore and gangue minerals occurs and as a side effect becomes easier to transport. After

1664-650: The U.S. Bureau of Mines still referred to yellowcakes as the final precipitate formed in the milling process and considered it to be ammonium diuranate or sodium diuranate . The compositions were variable and depended upon the leachant and subsequent precipitating conditions. The compounds identified in yellowcakes include uranyl hydroxide , uranyl sulfate , sodium para-uranate , and uranyl peroxide , along with various uranium oxides . Modern yellowcake typically contains 70% to 90% triuranium octoxide (U 3 O 8 ) by weight. Other oxides such as uranium dioxide (UO 2 ) and uranium trioxide (UO 3 ) exist. Yellowcake

1728-464: The electric arc furnace , basic oxygen steelmaking , and direct reduced iron (DRI). For sulfide ores, a different process is taken for beneficiation. The ore needs to have the sulfur removed before smelting can begin. Roasting is the primary method of separating, where wood was placed on heaps of ore and set on fire to help with oxidation. The earliest practices of roasting were done outside, allowing large clouds of sulfur dioxide to blow over

1792-413: The gangue minerals , which results in a higher grade product ( ore concentrate ) and a waste stream ( tailings ). There are many different types of beneficiation, with each step furthering the concentration of the original ore. Key is the concept of recovery , the mass (or equivalently molar) fraction of the valuable mineral (or metal) extracted from the ore and carried across to the concentrate. Before

1856-527: The medieval Islamic world , from Islamic Spain and North Africa in the west to Central Asia in the east. A later example was the Cornish stamps , consisting of a series of iron hammers mounted in a vertical frame, raised by cams on the shaft of a waterwheel and falling onto the ore under gravity. Iron beneficiation has been evident since as early as 800 BC in China with the use of bloomery . A bloomery

1920-486: The advent of heavy machinery, raw ore was broken up using hammers wielded by hand, a process called " spalling ". Eventually, mechanical means were found to achieve this. For instance, stamp mills were being used in central Asia in the vicinity of Samarkand as early as 973. There is evidence the process was in use in Persia in the early medieval period . By the 11th century, stamp mills were in widespread use throughout

1984-401: The case for very coarse material), or they can incorporate mechanisms to shake or vibrate the screen. Some considerations in this process include the screen material, the aperture size, shape and orientation, the amount of near sized particles, the addition of water, the amplitude and frequency of the vibrations, the angle of inclination, the presence of harmful materials, like steel and wood, and

Yellowcake - Misplaced Pages Continue

2048-401: The case of gold, after adsorbing onto carbon, it is put into a sodium hydroxide and cyanide solution. In the solution the gold is pulled out of the carbon and into the solution. The gold ions are removed from solution at steel wool cathodes from electrowinning. The gold then goes off to be smelted. Lithium is hard to separate from gangue due to similarities in the minerals. In order to separate

2112-403: The chemistry of the pulp needs to be made. These considerations include the pH, Eh and the presence of flotation reagents. The pH is important as it changes the charge of the particles surface and the pH affects the chemisorption of collectors on the surface of the particles. The addition of flotation reagents also affects the operation of these processes. The most important chemical that is added

2176-408: The coagulants work by reducing the thickness of the charged layer on the outside of the particle. After thickening, slurry is often stored in ponds or impoundments. Alternatively, it can pumped into a belt press or membrane filter press to recycle process water and create stackable, dry filter cake, or "tailings". Thermal drying is usually used for fine particles and to remove low water content in

2240-419: The concentration of the wanted minerals: in any particular case, the method chosen will depend on the relative physical and surface chemical properties of the mineral and the gangue. Concentration is defined as the number of moles of a solute in a volume of the solution. In case of mineral processing, concentration means the increase of the percentage of the valuable mineral in the concentrate. Gravity separation

2304-487: The crusher the ore will go through a grinder or a mill to get the ore into fine particles. Dense media separation (DMS) is used to further separate the desired ore from rocks and gangue minerals. This will stratify the crushed aggregate by density making separation easier. Where the DMS occurs in the process can be important, the grinders or mills will process much less waste rock if the DMS occurs beforehand. This will lower wear on

2368-578: The early 1200s around Sweden and Belgium, and not until the late 1400s in England. The pig iron poured from a blast furnace is high in carbon making it hard and brittle, making it hard to work with. In 1856 the Bessemer process was invented that turns the brittle pig iron into steel, a more malleable metal. Since then, many different technologies have been invented to replace the Bessemer process such as

2432-657: The equipment as well as operating costs since there is a lower volume being put through. After the milling stage the ore can be further separated from the rock. One way this can be achieved is by using the physical properties of the ore to separate it from the rest of the rock. Prior to any physical separation process, sizing of ore particles is important for effective separation. This is done by using either Industrial Screens or Classifiers. These processes are gravity separation , flotation, and magnetic separation . Gravity separation uses centrifugal forces and specific gravity of ores and gangue to separate them. Magnetic separation

2496-456: The flotation of fine grained minerals, such as those produced by the IsaMill. Staged flotation reactors (SFRs) split the flotation process into three defined stages per cell. They are becoming increasingly more common in use as they require much less energy, air and installation space. There are two main types of electrostatic separators . These work in similar ways, but the forces applied to

2560-411: The flotation of one mineral or minerals while activators enable the flotation of others. Examples of these include CN , used to depress all sulfides but galena and this depressant is believed to operate by changing the solubility of chemisorbed and physisorbed collectors on sulfides. This theory originates from Russia. An example of an activator is Cu ions, used for the flotation of sphalerite. There are

2624-418: The following equation (where S G {\displaystyle SG} represents specific gravity): Although concentration criteria is a useful rule of thumb when predicting amenability to gravity concentration, factors such as particle shape and relative concentration of heavy and light particles can dramatically affect separation efficiency in practice. There are several methods that make use of

Yellowcake - Misplaced Pages Continue

2688-470: The form of a belknap wash and suspensions in air are used in water-deficient areas, like areas of China, where sand is used to separate coal from the gangue minerals. Gravity separation is also called relative gravity separation as it separates particles due to their relative response to a driving force. This is controlled by factors such as particle weight, size and shape. These processes can also be classified into multi-G and single G processes. The difference

2752-600: The gas undergoes isotope separation through the process of gaseous diffusion , or in a gas centrifuge . This can produce low-enriched uranium containing up to 20% U-235 that is suitable for use in most large civilian electric-power reactors. With further processing, one obtains highly enriched uranium , containing 20% or more U-235, that is suitable for use in compact nuclear reactors—usually used to power naval warships and submarines . Further processing can yield weapons-grade uranium with U-235 levels usually above 90%, suitable for nuclear weapons . The uranium in yellowcake

2816-430: The geologic sciences. This includes the study of oil agglomeration A number of auxiliary materials handling operations are also considered a branch of mineral processing such as storage (as in bin design), conveying, sampling, weighing, slurry transport, and pneumatic transport. The efficiency and efficacy of many processing techniques are influenced by upstream activities such as mining method and blending . In

2880-511: The gravity separation processes, the spiral concentrators and circular jigs are two of the most economical due to their simplicity and use of space. They operate by flowing film separation and can either use washwater or be washwater-less. The washwater spirals separate particles more easily but can have issues with entrainment of gangue with the concentrate produced. Froth flotation is an important concentration process. This process can be used to separate any two different particles and operated by

2944-518: The land causing serious harm to surrounding ecosystems, both aquatic and terrestrial. The clouds of sulfur dioxide combined with local deforestation for wood needed for roasting compounded damages to the environment, as seen in Sudbury , Ontario and the Inco Superstack . The simplest method of separating ore from the gangue consists of picking out the individual crystals of each. This

3008-534: The lithium both physical and chemical separation techniques are used. First froth flotation is used. Due to similarities in mineralogy there is not complete separation after flotation. The gangue that is found with lithium after the flotation are often iron bearing. The float concentrate goes through magnetic separation to remove the magnetic gangue from the nonmagnetic lithium. EMC, the European Metallurgical Conference has developed to

3072-453: The mechanical separation of ore into two or more categories on an individual rock by rock basis. Also new sensors have been developed which exploit material properties such as electrical conductivity, magnetization, molecular structure and thermal conductivity. Sensor based sorting has found application in the processing of nickel, gold, copper, coal and diamonds. Dewatering is an important process in mineral processing. The purpose of dewatering

3136-528: The most important considerations are the economics of the processes, which is dictated by the grade and recovery of the final product. To do this, the mineralogy of the ore needs to be considered as this dictates the amount of liberation required and the processes that can occur. The smaller the particles processes, the greater the theoretical grade and recovery of the final product. This, however, becomes difficult to do with fine particles since they prevent certain concentration processes from occurring. Comminution

3200-596: The most important networking business event dedicated to the non-ferrous metals industry in Europe. From the start of the conference sequence in 2001 at Friedrichshafen it was host to some of most relevant metallurgists from all countries of the world. The conference is held every two years by invitation of GDMB Society of Metallurgists and Miners and is particularly directed to metal producers, plant manufactures, equipment suppliers and service providers as well as members of universities and consultants. Ore concentrate Ore concentrate , dressed ore or simply concentrate

3264-736: The ore from the gangue. Hydrophobic particles will rise to the top of the solution to be skimmed off. Changes to pH in the solution can influence what particles will be hydrophilic. Leaching works by dissolving the desired ore into solution from the rock. Electrowinning is not a primary method of separation, but is required to get the ore out of solution after leaching. Mineral processing can involve four general types of unit operation: 1) Comminution – particle size reduction; 2) Sizing – separation of particle sizes by screening or classification; 3) Concentration by taking advantage of physical and surface chemical properties; and 4) Dewatering – solid/liquid separation. In all of these processes,

SECTION 50

#1732781113206

3328-425: The particle size decreases. Dewatering screens operate by passing particles over a screen. The particles pass over the screen while the water passes through the apertures in the screen. This process is only viable for coarse ores that have a close size distribution as the apertures can allow small particles to pass through. Sedimentation operates by passing water into a large thickener or clarifier. In these devices,

3392-421: The particle size distribution of the materials being processed, commonly referred to as particle size analysis . Many techniques for analyzing particle size are used, and the techniques include both off-line analyses which require that a sample of the material be taken for analysis and on-line techniques that allow for analysis of the material as it flows through the process. There are a number of ways to increase

3456-481: The particles are different and these forces are gravity and electrostatic attraction. The two types are electrodynamic separators (or high tension rollers) or electrostatic separators. In high tension rollers, particles are charged by a corona discharge. This charges the particles that subsequently travel on a drum. The conducting particles lose their charge to the drum and are removed from the drum with centripetal acceleration. Electrostatic plate separators work by passing

3520-464: The particles settle out of the slurry under the effects of gravity, or centripetal forces. These are limited by the surface chemistry of the particles and the size of the particles. To aid in the sedimentation process, flocculants and coagulants are added to reduce the repulsive forces between the particles. This repulsive force is due to the double layer formed on the surface of the particles. The flocculants work by binding multiple particles together while

3584-456: The particles. Some common processes include rotary dryers, fluidized beds, spray driers, hearth dryers and rotary tray dryers. This process is usually expensive to operate due to the fuel requirement of the dryers. Many mechanical plants also incorporate hydrometallurgical or pyrometallurgical processes as part of an extractive metallurgical operation. Geometallurgy is a branch of extractive metallurgy that combines mineral processing with

3648-502: The pulp or slurry as they enable stable bubbles to be formed. This is important because if the bubbles coalesce, minerals will fall off their surface. The bubbles however should not be too stable as this prevents easy transportation and dewatering of the concentrate formed. The mechanism of these frothers is not completely known and further research into their mechanisms is being performed. Depressants and activators are used to selectively separate one mineral from another. Depressants inhibit

3712-425: The raw ore, after calcination was fed onto a moving belt which passed underneath two pairs of electromagnets under which further belts ran at right angles to the feed belt. The first pair of electromagnets was weakly magnetised and served to draw off any iron ore present. The second pair were strongly magnetised and attracted the wolframite, which is weakly magnetic. These machines were capable of treating 10 tons of ore

3776-575: The separation can be driven in two ways, either through a gradient in a magnetic field or the strength of a magnetic field. The different driving forces are used in the different concentrators. These can be either with water or without. Like the spirals, washwater aids in the separation of the particles while increases the entrainment of the gangue in the concentrate. Modern, automated sorting applies optical sensors (visible spectrum, near infrared, X-ray, ultraviolet), that can be coupled with electrical conductivity and magnetic susceptibility sensors, to control

3840-415: The size distribution of the particles. Classification refers to sizing operations that exploit the differences in settling velocities exhibited by particles of different size. Classification equipment may include ore sorters , gas cyclones , hydrocyclones , rotating trommels , rake classifiers or fluidized classifiers. An important factor in both comminution and sizing operations is the determination of

3904-400: The solution is pumped through the uranium deposit without disturbing the ground. Yellowcake is what remains after drying and filtering. The yellowcake produced by most modern mills is actually brown or black, not yellow; the name comes from the color and texture of the concentrates produced by early mining operations. Initially, the compounds formed in yellowcakes were not identified; in 1970,

SECTION 60

#1732781113206

3968-453: The surface chemistry of the particles. In flotation, bubbles are introduced into a pulp and the bubbles rise through the pulp. In the process, hydrophobic particles become bound to the surface of the bubbles. The driving force for this attachment is the change in the surface free energy when the attachment occurs. These bubbles rise through the slurry and are collected from the surface. To enable these particles to attach, careful consideration of

4032-648: The weight or density differences of particles: These processes can be classified as either density separation or gravity (weight) separation. In dense media separation a media is created with a density in between the density of the ore and gangue particles. When subjected to this media particles either float or sink depending on their density relative to the media. In this way the separation takes place purely on density differences and does not, in principle, relay on any other factors such as particle weight or shape. In practice, particle size and shape can affect separation efficiency. Dense medium separation can be performed using

4096-612: Was invented in the 19th century in Australia. It was used to recover a sphalerite concentrate from tailings, produced using gravity concentration. Further improvements have come from Australia in the form of the Jameson Cell , developed at the University of Newcastle, Australia. This operated by the use of a plunging jet that generates fine bubbles. These fine bubbles have a higher kinetic energy and as such they can be used for

#205794