This series of three films produced by ALCOA to educate the public about the aluminum industry focuses on the production of aluminum. The films discus Bauxite mining, refining, smelting, and delivery. The various aspects of the production of aluminum are shown including Bauxite Refining (:09), Smelting of Aluminum (5:30), and Aluminum Fabricating Process (10:10). The Bayer process shown is the principal industrial means of refining bauxite to produce alumina (aluminium oxide). Bauxite, the most important ore of aluminium, contains only 30–54% aluminium oxide, (alumina), Al2O3, the rest being a mixture of silica, various iron oxides, and titanium dioxide. The aluminium oxide must be purified before it can be refined to aluminium metal. Alcoa Corporation (from Aluminum Company of America) is an American industrial corporation. It is the world's fifth largest producer of aluminum, with corporate headquarters in New York City. From its operational base in Pittsburgh, Pennsylvania in the United States, Alcoa conducts operations in 10 countries. Alcoa is a major producer of primary aluminum, fabricated aluminum, and alumina combined, through its active and growing participation in all major aspects of the industry: technology, mining, refining, smelting, fabricating, and recycling. On November 1, 2016, Alcoa Inc. split into two new entities: Alcoa Corporation, which is engaged in the mining and manufacture of raw aluminum, and Arconic, which processes aluminum and other metals. In April 2017, Alcoa announced it will move its headquarters back to Pittsburgh effective September 1. We encourage viewers to add comments and, especially, to provide additional information about our videos by adding a comment! See something interesting? Tell people what it is and what they can see by writing something for example: "01:00:12:00 -- President Roosevelt is seen meeting with Winston Churchill at the Quebec Conference." This film is part of the Periscope Film LLC archive, one of the largest historic military, transportation, and aviation stock footage collections in the USA. Entirely film backed, this material is available for licensing in 24p HD, 2k and 4k. For more information visit http://www.PeriscopeFilm.com
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The Bayer process is the principal industrial means of refining bauxite to produce alumina (aluminium oxide). Bauxite, the most important ore of aluminium, contains only 30–60% aluminium oxide, (alumina), Al2O3, the rest being a mixture of silica, various iron oxides, and titanium dioxide. The aluminium oxide must be purified before it can be refined to aluminium metal. The Hall–Héroult process is the major industrial process for smelting aluminium. It involves dissolving aluminium oxide (alumina) (obtained most often from bauxite, aluminium's chief ore, through the Bayer process) in molten cryolite, and electrolysing the molten salt bath, typically in a purpose-built cell. The Hall–Héroult process applied at industrial scale happens at 940–980°C and produces 99.5–99.8% pure aluminium. Recycled aluminum requires no electrolysis, thus it does not end up in this process.
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Aluminium is the white metal which is extensively used in various occasions where the light weight metals and non-corrosive metals being used. You may wonder how this Aluminium metal available in the earth and in what method the Aluminium is extracted. Basically Aluminium is extracted from its ore called 'Boxite'. See how is on this video which is useful for people who involved in materials research.
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Aluminium is the most abundant metal on Earth. However, it is expensive because a lot of electricity is used to extract it. Bauxite is the aluminium ore. It is purified to yield aluminium oxide, which is a white powder. Aluminium is then extracted from aluminium oxide by electrolysis. The aluminium oxide must be made molten so that the ions can pass through it during electrolysis. Aluminium oxide has a very high melting point - over 2000 degrees celsius. So instead of trying to melt it, the aluminium oxide is dissolved in molten cryolite. Cryolite is an aluminium compound with a much lower melting point than aluminium oxide, and so using this reduces some of the costs in extracting aluminium. The steel case is coated with graphite, providing the negative cathode. The positive anodes are immersed in the molten cryolite, and are also made of graphite. When the battery is turned on and electricity flows, the aluminium forms at the negative cathode and sinks to the bottom of the tank where is is tapped off as a pure liquid metal. Oxygen forms at the positive anodes. The oxygen reacts with the carbon of the graphite, forming carbon dioxide. The positive anode therefore burns away, and needs replacing regularly. This is another reason for the extraction of aluminium being so expensive. SUBSCRIBE to the FuseSchool YouTube channel for many more educational videos. Our teachers and animators come together to make fun & easy-to-understand videos in Chemistry, Biology, Physics, Maths & ICT. VISIT us at www.fuseschool.org, where all of our videos are carefully organised into topics and specific orders, and to see what else we have on offer. Comment, like and share with other learners. You can both ask and answer questions, and teachers will get back to you. These videos can be used in a flipped classroom model or as a revision aid. Find all of our Chemistry videos here: https://www.youtube.com/watch?v=cRnpKjHpFyg&list=PLW0gavSzhMlReKGMVfUt6YuNQsO0bqSMV Find all of our Biology videos here: https://www.youtube.com/watch?v=tjkHzEVcyrE&list=PLW0gavSzhMlQYSpKryVcEr3ERup5SxHl0 Find all of our Maths videos here: https://www.youtube.com/watch?v=hJq_cdz_L00&list=PLW0gavSzhMlTyWKCgW1616v3fIywogoZQ Twitter: https://twitter.com/fuseSchool Access a deeper Learning Experience in the FuseSchool platform and app: www.fuseschool.org Follow us: http://www.youtube.com/fuseschool Friend us: http://www.facebook.com/fuseschool This Open Educational Resource is free of charge, under a Creative Commons License: Attribution-NonCommercial CC BY-NC ( View License Deed: http://creativecommons.org/licenses/by-nc/4.0/ ). You are allowed to download the video for nonprofit, educational use. If you would like to modify the video, please contact us: [email protected]
Views: 174299 FuseSchool - Global Education
Hall-Héroult process.. Aluminium smelting is the process of extracting aluminium from its oxide, alumina, generally by the Hall-Héroult process. Alumina is extracted from the ore bauxite by means of the Bayer process at an alumina refinery. This is an electrolytic process, so an aluminium smelter uses prodigious amounts of electricity; they tend to be located very close to large power stations, often hydro-electric ones, and near ports since almost all of them use imported alumina. A large amount of carbon is also used in this process, resulting in significant amounts of GHG emissions. #BiotechReview #Aluminium #Bauxite # AluminiumSmelting #Hall-HeroultProcess
Views: 16748 Biotech Review
Discover heavy industry - Aluminium smelting discover: Together we discover the technology and machinery that support the aluminum smelting process Aluminum smelting is a complex process for separating aluminum from the ore raw materials. This process is carried out in liquid state, with the support heavy machinery.
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Delivering Outotec’s alumina calciners to the Gove refinery in North East Arnhem Land in the Northern Territory, Australia, was a challenge as the only way to get them to this remote location was shipping by sea. Yet our innovative approach to the plant design made it possible.
Views: 966 OutotecOyj
Bauxite Processing Plant Overview : http://crusher.chinashibang.com/solution/mineral/bauxite_processing_plant.html Get Price: http://crusher.chinashibang.com/contact_us/ Contact Email: [email protected] As we know, bauxite ore is very hard, so it takes a longer time for crushing. In the bauxite processing, the Jaw Crusher is used in the coarse crushing, and Impact Crusher is used in the secondary, Cone Crusher is in fine crushing. Usually, according to the quarry conditions, mobile crushing plants are also used in the bauxite quarrying. Bauxite particles should be further grinded by the use of grinding mill. And the types of grinding mill are varied, including Ball Mill, LM series Vertical Shaft Mill, T130X Superfine Roller Mill, and Raymond Mill, etc. To get aluminium concentrate, it adopts the method of gravity separation, adopting a Spiral Classifier. Bauxite processing flow: 1. First of all, the barite will be evenly entered the coarse crushing machine to proceed the primary crushing. 2. And then the coarse barite will be entered the impact crusher by the belt conveyor to proceed the secondary crushing. 3. And the fine stone materials will be entered the vibrating screen to produce various stone specification. And particle size which has not satisfied the requirements will receive the repeated crushing. ShangHai Shibang Machinery Co., Ltd is a professional manufacturer and supplier specialized in the research and development of industrial crushing & screening equipments. SBM Machinery always sticks to the concept of innovation and to improve the technical performance and international competitiveness. Meanwhile, SBM provides top pre-sale, sale, after-sale services.
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Paragominas Bauxite Mine:http://solution.mineralsprocessingplant.com/ Rio Tinto Alcan:http://solution.mineralsprocessingplant.com/ The Chemistry and Processing of Jamaican:http://solution.mineralsprocessingplant.com/ Jamaica Promotions Corporation:http://solution.mineralsprocessingplant.com/ Mining:http://solution.mineralsprocessingplant.com/ Bauxite crusher,Bauxite mining,Bauxite ore grinding equipment,Bauxite crushing:http://solution.mineralsprocessingplant.com/ Paragominas lies within the eastern Amazon region and the Maranhão Basin where it would seem to have been developed in late Tertiary and early Quaternary sediments. The bauxitic zone extends over at least 1,000km² with an average thickness 2.2 ±1m and estimated resources of more than 1Gt of bauxite. Reserves in were estimated at 878Mt (USGS). Soon after this, in , Karl Joseph Bayer described what is now known as the Bayer Process, which led to a dramatic reduction in the cost of aluminum metal. Today, it is an everydaymodity, rather than a precious metal. The Bayer Process, which continues to be the most economical method of manufacturing alumina can be schematically summarised in a flow chart, Although deposits of aluminous red earth have been known to occur in the Tertiary Limestone areas (which covers two thirds of the land surface of Jamaica) since the 's, it was not until the 's that their economic significance as an ore of aluminum was recognised. MINING AND MINING RESOURCES Although there had been attempts for over a century to establish small-scale mining in Jamaica, the present well-established mineral industry of Jamaica only dates back to when the export of kiln dried metallurgical bauxite ore was started. This was shortly followed by the export of alumina. The birth of this new industry was the result of a successful exploration and development programme. It was somewhat unusual in that this development occurred in areas near to well-established population centres with such infrastructure facilities as roads, railways and harbours. All these, of course, had to be vastly improved to service the new industry. Jamaica's mineral industry is mainly based on bauxite but it also includ
Views: 749 Jacqueline Sabrina
Construction has been completed on the calcination process facility of our Al Taweelah alumina refinery, the UAE's first, after more than 2.4 million hours of work. Learn more: https://www.ega.ae/en/about-us/operations/al-taweelah/ Al Taweelah alumina refinery is the first of its kind to be built in the UAE, and will refine bauxite ore into alumina, the feedstock for aluminium smelters. Once fully ramped up, the refinery is expected to fulfill 40 per cent of EGA's requirements for this material.
Views: 1682 Emirates Global Aluminium
Boké is the capital city of Boké Prefecture within the Boké Region of Lower Guinea near the border with Guinea-Bissau. It is also a sub-prefecture of Guinea. Located along the Rio Nuñez which flows to its not-too-distant mouth on the Atlantic Ocean, Boké is a port. It is known for the Fortin de Boké museum, formerly a slave fort. The town is served by Boké Baralande Airport. As of 2014 the city and surrounding sub prefecture had a population of 61,449 people.Riots have paralysed a major mining town in Guinea, with protesters destroying property, vehicles and equipment. People in Boke, north-west Guinea, say they can no longer tolerate power cuts and high levels of pollution. Operations at the bauxite mines have been disrupted and several rioters arrested. in Guinea says demosntrators tried to kidnap a senior general sent to help resolve the crisis. Bauxite, an aluminium ore, is the world's main source of aluminium. It consists mostly of the minerals gibbsite (Al(OH)3), boehmite (γ-AlO(OH)) and diaspore (α-AlO(OH)), mixed with the two iron oxides goethite and haematite, the clay mineral kaolinite and small amounts of anatase (TiO2) and ilmenite (FeTiO3 or FeO.TiO2). In 1821 the French geologist Pierre Berthier discovered bauxite near the village of Les Baux in Provence, southern France. In 1861, French chemist Henri Sainte-Claire Deville named the mineral "bauxite". About a third of the world's bauxite reserves are in Guinea, but poverty remains high. Much of the world's aluminium comes from bauxite.Bauxite is usually strip mined because it is almost always found near the surface of the terrain, with little or no overburden. As of 2010, approximately 70% to 80% of the world's dry bauxite production is processed first into alumina and then into aluminium by electrolysis. Bauxite rocks are typically classified according to their intended commercial application: metallurgical, abrasive, cement, chemical, and refractory. Usually, bauxite ore is heated in a pressure vessel along with a sodium hydroxide solution at a temperature of 150 to 200 °C. At these temperatures, the aluminium is dissolved as sodium aluminate (the Bayer process). The aluminium compounds in the bauxite may be present as gibbsite(Al(OH)3), boehmite(AlOOH) or diaspore(AlOOH); the different forms of the aluminium component will dictate the extraction conditions. The undissolved waste, bauxite tailings, after the aluminium compounds are extracted contains iron oxides, silica, calcia, titania and some un-reacted alumina. After separation of the residue by filtering, pure gibbsite is precipitated when the liquid is cooled, and then seeded with fine-grained aluminium hydroxide. The gibbsite is usually converted into aluminium oxide, Al2O3, by heating in rotary kilns or fluid flash calciners to a temperature in excess of 1000oC. This aluminium oxide is dissolved at a temperature of about 960 °C (1,760 °F) in molten cryolite. Next, this molten substance can yield metallic aluminium by passing an electric current through it in the process of electrolysis, which is called the Hall–Héroult process, named after its American and French discoverers. Prior to the invention of this process in 1886, elemental aluminium was made by heating ore along with elemental sodium or potassium in a vacuum. The method was complicated and consumed materials that were themselves expensive at that time. This made early elemental aluminium more expensive than gold. See also
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Check us out at http://chemistry.tutorvista.com Extraction Of Aluminium Major ore of aluminium is bauxite (Al2O3.2H2O). It is an oxide of aluminium. Though, aluminium oxide can be reduced by chemical methods, but it is extracted from its ore by electrolysis, because it is highly reactive metal. Please like our facebook page http://www.facebook.com/tutorvista Follow us at: https://plus.google.com/+tutorvista/
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#iitutor #Chemistry #ChemicalEarth https://www.iitutor.com/ Aim: To extract pure aluminium from aluminium ore (Aluminium Oxide or Bauxite). Extracting aluminium from the lithosphere Ore Bauxite (hydrated aluminium oxide (A12O3·H2O and A12O3·3H2O with impurities such as silica (SiO2), iron(III) oxide (Fe2O3) and clay minerals). Properties used in separation • Al2O3 is soluble in NaOH solution while impurities are not. • The resulting solution can then be filtered to remove the impurities. • Pure aluminium oxide can be recovered. • Because of the high melting point of aluminium oxide, it must be dissolved in a suitable molten solvent (cryolite) before it can be electrolytically decomposed to produce pure aluminium. Leaching – dissolving out on substance from a solid mixture by allowing a liquid to percolate through the mixture. Impervious layer – a surface layer that does not allow gases or liquids to penetrate down to the surface below the layer. Procedure 1 Al ore to ground into a fine powder to mechanically separate impurities. 2 Powder is dissolved in hot NaOH. 3 NaOH solution is filtered to remove impurities (mostly iron oxides). 4 Solution ia acidified to precipitate out the Al(OH)3 5 Aluminium hydroxide crystals are filtered and dehydrated by heating (‘calcination’) at 1200°C to form aluminium oxide. 6 Aluminium oxide is dissolved in molten cryolite (Na3A1F6) at 1000°C and the mixture electrolysed using graphite (carbon) anodes (positive electrode) and an iron tank cathode (negative electrode). 7 Liquid aluminium forms at the cathode and sinks to the base of the tank. It is regularly tapped off and run into moulds. Uses of aluminium • Aluminium is a lightweight yet strong structural metal. • It is used as a structural material for ships, aeroplanes, cars and window/door frames. • Because of its high electrical conductivity it is used as an electrical conductor in high voltage lines. • It resists corrosion because of an impervious oxide layer that forms on its surface. Problems with wastes • Exhaust gases from an aluminium refinery are the major pollution problem. • Major emissions are HF, CO2 and SO2. • HF must be removed, HF is absorbed into alumina then returned to the electrolytic cells. • SO2 can be reduced by using low sulphur graphite electrodes. • Aluminium refinement is an immensely energy intensive process. • Majoerity of electricity production in Australia is from coal and thus emissions from energy production are significant. • Solid wastes are either
Views: 1257 iitutor.com
This Chemistry video tutorial explains the occurrence and principles of extraction of zinc Atomic mass : 65.37 Valence : 2 Atomic number : 30 Symbol : Zn Position in the periodic table : Period Number -4, Group Number -12. The ancient used an alloy of Zinc and Copper not very different from brass without knowing its actual composition. Zinc has been known in our country for a long time and has been mentioned in Ayurvedic treatises as yashda. It is commonly called jast. Occurrence Zinc does not occur in the native form since it is a reactive metal. However, in the combined state, zinc is widely distributed. Ores The important ores of zinc are i) Zinc blende, ZnS ii) Calamine, ZnCO3 iii) Zincite, ZnO The chief ore of Zinc is Zinc blende. In India large deposits of zinc blende occur in Zawar mines near Udaipur in Rajasthan.
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Bauxite Ore Processing Waste,Bauxite Ore Plants:http://solution.mineralsprocessingplant.com/ sale of bauxite ore grinding mill | Solution for ore:http://solution.mineralsprocessingplant.com/ Bauxite Crusher Manufacturer in China,Bauxite Roller Crusher for Sale:http://solution.mineralsprocessingplant.com/ bauxite beneficiation plant,bauxite mine plant and machinery suppliers,commissioning of ball mill for bauxite ore:http://solution.mineralsprocessingplant.com/ Greece bauxite ore crushing process, bauxite ore mining machine for:http://solution.mineralsprocessingplant.com/ Calcined Bauxite-China Calcined Bauxite Manufacturers Suppliers:http://solution.mineralsprocessingplant.com/ Bauxite ore crusher,bauxite ore crushing machine for:http://solution.mineralsprocessingplant.com/ Bauxite processing equipment, Bauxite dressing equipment, bauxite beneficiation process:http://solution.mineralsprocessingplant.com/ A. From shaft Kiln B. From Rotary Kiln C. From Round Kiln Nearly three decades' precipitation and accumulation endows HNGM with iparable advantages of mechanicals and raw materials. We are always ... Bauxite is the most important aluminium ore. We are specialized in mineral sources, such as refractory raw material: Bauxite. ...Ourpany focus on the quality of ...1. Rotary Kiln Calcined Bauxite Zenith, the world leader in rock crushing technology, has developed all kinds of mining machines to fulfill the mining production needs. Incorporating the latest crusher know-how, Zenith crusherbines the highest crushing efficiency and end product quality with the lowest per ton production costs. Take a closer look at the Zenith crusher; you will be sure to find Zenith crusher ideally suited to your needs. The general process of extracting aluminum in industry is as follows: First you need to extract alumina from bauxite. Then the alumina will be changed to aluminum by electrolysis. Now there are mainly three methods for alumina production which include sintering, Bayer and joint method. Bauxite ore mineral with alumina. Since bauxite ... is a manufacturer of crushers and grinding mills, and provides bauxite ... Tel: -21- E-mail: [email protected] ... Bauxite impact crusher is
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Get the price of machines: [email protected] ,for more details, here is our skype: billchanglei123 In terms of quality we use the industry's most demanding standards, from the beginning of Raw material steel, to design aspects and production processes of the product, no one detail is left off. We will timely and efficiently provide the necessary accessories. We promptly accept the technical advice and provide technical diagnosis. Driven by national policy, crusher industry of low-carbon environmental protection and high-tech expands the market demand for crusher. Hydraulic manually start the chassis, hydraulic opening and closing device, only need one person can easily open and close the chassis, not only is lightweight and fast, but also is secure and reliable and is ease of maintenance. We provide services in advance according to the requirements plan provided by the enterprise that has contracted to ensure enterprise use equipment early and produce early.
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The latest in a series of environmental fallouts has hit the Central Highlands. Workers at the Nhan Co alumina plant in Vietnam’s Central Highland province of Dak Nong last week discovered a broken pipeline containing the corrosive chemical sodium hydroxide. Some 9.6 cubic meters of sodium hydroxide has leaked from the plant, posing serious environmental threats to nearby residents. Sodium hydroxide is used at high temperatures to wash aluminum ore, also known as bauxite. Alumina is a white powder made from bauxite ore for producing aluminium. It sits between bauxite and aluminum in the light metal's production process chain. The leaked chemical has reportedly penetrated an area of 600 square meters, and some of it has been flowing into a stream, state media reported. The incident occurred on July 23 when a pipeline burst as the sodium hydroxide was being pumped to the production area.
Views: 271 CTV VIET
Non-ferrous Extractive Metallurgy by Prof.H.S. Ray,Department of Metallurgical & Materials Engineering,IIT Kharagpur.For more details on NPTEL visit http://nptel.iitm.ac.in
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The Discipline of Materials Science and Engineering at IIT Gandhinagar, under the GIAN scheme, is conducting a 10- days course on Aerospace Materials: Microstructure, Fracture and Fatigue during 11th June 2018 to 22nd June 2018, taught by Dr. Kumar V. Jata (CEO, Jata Materials Solutions, USA). Dr. Jata is an Air Force Research Labs Fellow (2006), and Fellow, ASM International (1998), and is an expert in the area of Microstructure-Property correlation, Corrosion science, Fatigue and Fracture.
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Aluminium ore is purified with NaOH, then dissolved in cryolite. This lowers the melting point by approx. 1000oC making electrolysis more economic.
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This 60 second short follows a can of cola from the extraction of aluminum ore (Bauxite) to its post consumer state. As consumers we are not aware of everything that goes into the pathway of a product, when the impact of production is brought into perspective it creates a meaningful picture of why it is important to reduce, reuse and recycle.
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The Film investigates inroads made by multi-national companies in Kashipur and Lanjigarh in Orissa to set up aluminium refineries and exploit bauxite reserves in the area, despite agitations by the local people and international indignation. Directed by K. N. T. SASTRY; Producer & Commissioning Editor - RAJIV MEHROTRA, PSBT Toxic links, Environment Film Festival, New Delhi Konark Film Festival, Orissa K. N. T. Sastry, a well-known film critic turned filmmaker, received the National Award for Best Film Critic in 1989. His debut feature film was critically acclaimed and won several awards. His documentary Surabhi received the National Award for the Best Anthropological/ Ethnographic Documentary in 1999. Rajiv Mehrotra, is an independent filmmaker and Managing Trustee of PSBT. His work has won more than two hundred awards and has had more than fourteen hundred film festival screenings. He is Trustee and Secretary of The Foundation for Universal Responsibility of HH the Dalai Lama established with the Nobel Peace Prize. Rajiv's nine books have been published in 50 editions/languages. PSBT (The Public Service Broadcasting Trust) The Public Service Broadcasting Trust, India, commissions, produces and mentors 50+ independent documentary films a year. Our work wins international critical claim. Thus far, on an average, for every film we support, there are two film festival selections by professional juries around the world and we win an award for every two to three of them. We are a not-for-profit based in New Delhi that works to create and sustain a credible independent niche space for public service broadcasting in India. We work with extremely modest budgets and technologies, about two thirds of our filmmakers are starting out talents from across the country, fifty per cent are women. We have been/ are primarily funded by Prasar Bharati, India’s national public broadcaster via its television wing Doordarshan (DD) and before this, the External Publicity and Public Diplomacy Division of the Ministry of External Affairs, the Films Division and private Foundations. PSBT is managed by a core Programme Team that includes Executive Producers Tulika Srivastava and Ridhima Mehra with Sandeep Bhatt and others . It is overseen by a distinguished Board of Trustees who include Adoor Gopalakrishnan, Fali Nariman, Kiran Karnik, Mrinal Sen, Shyam Benegal, Sharmila Tagore, Sunita Narain, and CEO, Prasar Bharati. CREDITS CAMERA: C Surendra EDITING: Shravan , K Suresh Produced by PSBT in partnership with Doordarshan http://www.psbt.org/ ; http://www.ddindia.gov.in/ Festival, screening and purchase queries: [email protected]
Views: 80 PSBT India
This short flash animation looks in considerable depth at the extraction of alumina from bauxite and the subsequent extraction of aluminium by electrolysis in the Hall-Heroult Cell.
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The Ajka alumina sludge spill was an industrial accident at a caustic waste reservoir chain of the Ajkai Timföldgyár alumina plant in Ajka, Veszprém County, in western Hungary. On 4 October 2010, at 12:25 CEST , the northwestern corner of the dam of reservoir number 10 collapsed, freeing approximately one million cubic metres of liquid waste from red mud lakes. The mud was released as a 1 - wave, flooding several nearby localities, including the village of Kolontár and the town of Devecser. Ten people died, and 150 people were injured. About 40 km2 of land were initially affected. The spill reached the Danube on 7 October 2010. It was not initially clear how the containment at the reservoir had been breached, although the accident came after a particularly wet summer in Hungary, as in other parts of central Europe. Police have seized documents from the Ajkai Timföldgyár plant, although a spokesman for MAL Hungarian Aluminium , the company that operates the plant, said the last insp... http://www.wikividi.com ____________________________________ Shortcuts to chapters: 00:01:31 Origin of the mud 00:03:37 Effects ____________________________________ Copyright WikiVidi. Licensed under Creative Commons. Wikipedia link: https://en.wikipedia.org/wiki/Ajka_alumina_plant_accident
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The cell is illustrated and the process demonstrated using simple paper models. The chemical extraction of Alumina (Al2O3) from Bauxite is also considered very briefly. Aluminium was first extracted in the middle of the 19th Century. Then it was obtained directly from molten alumina. Due to the very high mp of alumina and the huge cost of generating electricity at that time, aluminium was more expensive than gold. By the early part of the 20th Century, with the development of much a cheaper means of generating electricity and Hall's discovery/invention, aluminium had become relatively cheap. Frank Scullion Production and Recording: Frank Scullion
Views: 29814 FranklyChemistry
Extraction of Aluminium (AL) એલ્યુમિનિયમ નિષ્કર્ષણ General Principal and Processes of Isolation Of Elements 12th science chemistry Follow US: https://www.instagram.com/earthedutech/ http://earthedutech.com/ https://www.facebook.com/EarthEdutech/ https://twitter.com/EdutechEarth/ #Like, #Share, #Subscribe.... Aluminium is the most abundant metal on Earth. However, it is expensive because a lot of electricity is used to extract it. Bauxite is the aluminium ore. It is purified to yield aluminium oxide, which is a white powder. Aluminium is then extracted from aluminium oxide by electrolysis. The aluminium oxide must be made molten so that the ions can pass through it during electrolysis. Aluminium oxide has a very high melting point - over 2000 degrees celsius. So instead of trying to melt it, the aluminium oxide is dissolved in molten cryolite. Cryolite is an aluminium compound with a much lower melting point than aluminium oxide, and so using this reduces some of the costs in extracting aluminium. The steel case is coated with graphite, providing the negative cathode. The positive anodes are immersed in the molten cryolite, and are also made of graphite. When the battery is turned on and electricity flows, the aluminium forms at the negative cathode and sinks to the bottom of the tank where is is tapped off as a pure liquid metal. Oxygen forms at the positive anodes. The oxygen reacts with the carbon of the graphite, forming carbon dioxide. The positive anode therefore burns away, and needs replacing regularly. This is another reason for the extraction of aluminium being so expensive.
Views: 24 Earth Edutech