How to use alumina in a sentence

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Sentence Examples Some of the studied rocks show high alumina characteristics probably reflecting the high modal content of very calcic plagioclase. And the unstable alumina distribution in the electrolyte furtherly causes larger voltage fluctuation of the cell. It is among the world's leading producers of bauxite and alumina, which are exported to Canada, Norway, and the United States. In order to effect this reduction, much of the sodium oxide added as a flux is replaced by boric oxide and some of the lime by alumina. The major exports are bauxite and alumina, apparel, sugar, bananas, coffee, citrus and citrus products, rum, cocoa, and labor. The process would use natural gas in zirconia tubes to directly reduce the alumina with significant power and emissions reduction. Anodizing at 42-46 V in 3.0 M selenic acid produced highly ordered porous alumina. This current causes the alumina in the mixture to react with the carbon anode, forming aluminium and carbon dioxide. The alumina grains are fused or densely sintered together to obtain high density. The capacity value of the sensitive element, on an alumina rest, changes according to the surface dampened by raindrops. The alumina is dissolved in a cryolite bath to be electrolysed at a lower temperature. These aggregates commonly contain much silica, alumina, titania and other hydrolyzed oxides and frequently large amounts of humic material. Beryllium, which is contained in imported alumina made from bauxite, is a particular health concern for the aluminum industry. Although they are among the most energy efficient in the world, the cost of production is higher than in other western world alumina plants. These products, also known as corundum, are obtained by fusing alumina or bauxite in an electric arc furnace. Most of the alumina refineries are built close to bauxite mines, so as to avoid uneconomical long distance transportation of bauxite ores. It follows other successfully completed or ongoing projects for the treatment of nickel, uranium, bauxite and alumina. China relies on expensive imported alumina, the refined version of bauxite, the ore from which aluminium is made. But so was the fear Vietnam would be stuck exporting its relatively cheap alumina yield to China. Refractory clay, also known as fire clay, is a detrital clay composed mainly of kaolinite with a high content of alumina and silica. Show More Sentences The silica, alumina, and iron come from sand, clay, and iron ore. These processes remove impurities such as silica and alumina from the ore, and reduce it to the form and size desired by the mining company. The economic benefits of producing alumina in the Central Highlands are less than those earned from agriculture. Sodium, potassium or calcium ions serve to compensate the deficiency in terms of positive electrical charge in alumina tetrahedrons. He called the new compound Carborundum because the natural mineral form of alumina is called corundum. The integrated vacuum sensor made of alumina ceramic has an outstanding corrosion resistance and superior long-term stability. Design, fabrication, maintenance and installation of backup cameras for the alumina tank conveyor and lift equipment. Men on the wall of Vedanta alumina refinery's second red mud pond, which is under construction, Lanjigarh. Purified alumina is dissolved in molten cryolite and electrolyzed with direct current. Orbite has also entered into an agreement for the preferential supply of alumina to Alouette. In alumina ceramics, what is the function of the ceramic component? The product is very sensitive to metallic salts and is eliminated in residual water in the form of mud by alumina sulphate treatment. Pure alumina is added to this mixture to assist with the formation of alumina trihydrate crystals. A number of projects also position us to become the global leader in alumina. The principal economic activities and primary sources of foreign exchange are bauxite mining and alumina production, tourism, and sugar and banana exports. This mixture of lime, alumina and silica is produced when iron is smelted with coke in blast furnaces. The thin layer may be an adsorbent such as silica gel or alumina, which is made into a slurry, placed in a layer on the glass plate, and then dried. Lithophane in alumina, set onto a candle lamp, thanks to the candle light, the image of the model show through. This contract also gave Norsk Hydro an option to increase its purchases of alumina. Alum stone is a natural crystalline powder derived from alumina and alum shale, which are aluminium oxides and hydroxides. Show More Sentences Heat neutral alumina for 16 h at 400°C, and then cool to room temperature in a desiccator. Nevertheless, it has to be borne in mind that 'long term' alumina contracts do not insulate buyers or sellers from industry price fluctuations. Some castable refractories are made in the form of mortars, usually tabular alumina with calcium aluminate cement as a binder. Typical construction materials for the sensor and integral cable include stainless or inconel metallic sheaths with alumina or magnesia insulation. On August 8th, after a 22-month delay, India's Supreme Court gave the Indian arm of Vedanta Resources, a metals and minerals giant, permission to mine the ore, which will feed the firm's alumina refinery nearby. But a bigger factor these days is the raw material, alumina. A metal processing company in Singapore introduced a new process which avoided these problems by applying gas phase treatment using a fluidized bed of alumina particles. Each day, the rail system serving the port of Quebec transports food and feed grain, alumina, nickel and other ores and concentrates, chemicals, petroleum products and other goods. The vessel stopped at Québec on the evening of November 13 to unload a portion of the brown alumina grude and obtain an acceptable Seaway draught of 7.98 m fore and aft. The integrated alumina ceramic diaphragm vacuum sensor is chemically resistant, and offers outstanding measuring accuracy independent of gas type. Amnesty International on Thursday welcomed the Indian government's decision to reject plans for the expansion of an alumina refinery by a subsidiary of UK-based Vedanta Resources, in the state of Orissa. These minerals are primarily carbonates, sulfides, or oxides of the metal, mixed with other components such as silica and alumina. The alumina of the topaz has gone to form muscovite of the variety known as margarodite with less margarite. These sheets are available in various materials such as alumina, zirconia and magnesia. The BAJV commenced operations in April 2011 and aims to develop an alumina refinery to produce alumina from locally mined bauxitic gravels. Four people have already died and at least 120 are injured after a resevoir containing waste from an alumina factory burst. One method of manufacturing thin film resistor chips is through the sputtering of nickel chromium on an alumina substrate. Electra mines chalky geyserite, kaolin, copper and gold.Apple Bay covers accessible silica, alumina and geyserite. This rapid increase in production has maintained upward pressure on alumina prices globally and has helped increase power costs within China, helping to slow production growth. The use of a stainless steel light fitting on an equipment made entirely from highly polished steel assigns a higher value to this latter than by mounting an alumina cast light on it. Show More Sentences High spot alumina prices have also likely helped to reduce the growth rate of expansion, and the continued high prices, coupled with government initiatives, are expected to further delay some projects in China. The alumina is usually freshly prepared undried material made by reacting aluminium sulfate or chloride with sodium or calcium carbonate or bicarbonate or ammonia. Refratechnik Ibérica, S. A. founded in 1977, manufactures and supplies high-grade alumina rich bauxite, andalusite und mullite bricks as well as fireclay bricks. The aluminum industry uses calcium fluoride as a reactant, or a chemical aid to lower the melting temperature in the electrolytic bath where metal aluminum is produced from alumina. Presented in the figure is a specific heat test result for a polycrystalline alumina sample between room temperature and 1600°C. Additionally shown are literature values for pure alumina. Each of the four oxygen anions is, in turn, shared with another silica or alumina tetrahedron, extending the lattice structure in three dimensions. Each layer is formed of tetrahedrally coordinated Si atoms fused into an edge-sharing octahedral plane of either alumina or magnesia. For these reasons, a major use of tabular alumina is in the production of high-quality refractories, the materials used for lining industrial furnaces. The contents of alumina, ferric oxide, and alkalis are variable but may amount to several percent in light-coloured opals and more if pigmenting minerals are also present. The company produces very high grade industrial ceramics including alumina, cordierite, mullite and zirconia, etc. Only those ores containing significant concentrations of the minerals gibbsite and boehmite, which contain 65 and 85 percent alumina, respectively, are generally considered economical to be processed. Finally, the as-spun samples were pretreated at 1,200 °C in a close round alumina crucible with a graphite inwall, i.e., a carbothermal environment, for 1 h, and then annealed at 1,250 °C for another hour. The European aluminium producers would have no option but to buy alumina from non-European sources, which would lead to reduced security of supply for the primary industry. The Italian exemption from excise tax applies to all undertakings using mineral oils for the production of alumina within the meaning of point 14 of table A of the Single Text on excises. Borazon or special fused alumina wheels are recommended for resharpening. Aluminum bronze results in alumina deposits, silicon bronze in silica deposits and trace aluminum in brass results in the complex gahnite. A process for the production of dihydrocarbyl polysulfide which comprises reacting a liquid hydrocarbyl mercaptan with sulfur at a temperature of 25 to 105°C in the presence of added alumina catalyst. Orthodontia is also an area that increasingly consumes ceramic, with the replacement of steel for orthodontia brackets with alumina or zircon ceramics manufactured using CIM techniques. Aluminium fluoride is utilised mainly as a make-up ingredient in the molten cryolite bath employed in the electrolytic reduction of alumina into aluminium metal in the Hall-Héroult process. The Hall-Heroult Process involves an electrolytic operation where alumina is reduced to aluminum metal in a molten bath of cryolite and various salts. Show More Sentences In still another application, an aluminous insulating material is formed by melting alumina and silica in an electric furnace and subjecting the molten mixture to high-velocity gases to produce fine white fibres. The challenge in extracting alumina from aluminous clay is to eliminate iron and other impurities, in both an economically viable and environmentally acceptable manner. The project to produce alumina from these claystones requires a significant investment and should be based on the considerable resources of relatively uniform content exploitable in an open-air quarry. In this perspective, Silcea purchased the Washcoat alumina business of WR Grace in 2007, thus completing its range of materials for the automobile catalysis sector. Rio Tinto Alcan today announced it has reached an agreement with Norsk Hydro ASA to expand its alumina supply to Hydro Aluminium from 500,000 tonnes of alumina per year to 900,000 tonnes from 2011 to the end of the contract. The clarified solution is further cooled in heat exchangers, enhancing the degree of supersaturation of the dissolved alumina, and pumped into tall, silolike precipitators. By way of an example, gamma alumina, which is the best known type of alumina, has a defect in its spinel structure, in which the oxygens are in a close-packed cubic structure. Depending on the proportion of alumina and lime as well as impurities in the minerals used, these powders may vary in colour from the whitest white via all shades of beige to jet black. Extra heavy polyester fibre fabric, full resin bond with zirconia alumina. The dark phase is alumina and the grey phase cubic zirconia. Zirconia alumina grain is suitable for deburring steel, including stainless grades. A-COOL aluminium oxide types are preferably used on aluminium. Refractories: industrial ceramics manufactured from raw materials: alumina, zirconia, silicon carbide, etc.: designed to withstand extreme conditions of mechanical stress, temperature and chemical aggression. It shall include the use of appropriate chemicals to remove the adsorbed ions in order to restore the adsorption capacity of the activated alumina, and to remove any possibly formed biofilms. Particles such as viruses, colloids, bacteria, and small fragments of silica and alumina may be separated into different fractions of various sizes and densities. The iron oxides start to react with the quicklime and the alumina to form liquid tetracalcium aluminoferrite at 1,300 °C, at which temperature the minerals dissolve, increasing the reaction between them. Clay is the second most important raw material for the manufacture of cement since when the limestone used does not contain sufficient alumina and silica, the addition of argillaceous material is required. Silica can potentially create Lewis acid sites and the mixed silica alumina coating can possess both acid and basic sites. However, the grain size changes in other ceramic materials, like tetragonal zirconia and hexagonal alumina, were not statistically significant. These improvements are in general in the form of a support made from an inert and thermally stable material such as silica, carbon or alumina. Huber Engineered Materials has increased capacity at its precipitated alumina trihydrate plant in Bauxite, Arkansas by 30 percent. Show More Sentences Three new alumina trihydrate grades optimized for plastics composites are available from Huber Engineered Materials, Atlanta. The company produces very high-grade industrial ceramics including alumina, cordierite, mullite, and zirconia, etc. Also Hydramax magnesium hydroxides and hydroxy carbonates and Hydrax alumina hydrates ranging from 1-10 microns. Also Hydramax magnesium hydroxides and hydroxyl carbonates and Hydrax alumina hydrates ranging from 1-10 microns. These objects are made from substances such as glass, alumina, zirconia, silica, magnesia, lime, beryllium oxide, and ferric oxide. The simplest reverberatory is nothing more than a steel box lined with alumina refractory brick with a flue at one end and a vertically lifting door at the other. Scientists at the University of Tokyo's Institute of Industrial Science solved this problem by developing a way to push alumina into the silicon dioxide using gases. Kaolinite, illite, quartz, microcline, dickite, mordenite, gamma alumina and iron rich minerals, such as pyrite and hematite, constituted the mineral makeup. The lower campaign life is probably associated with a reduction of alumina formation from deoxidation of carbon and low alloy steels with aluminum. This complex is the only self-propelled equipment of this kind in Russia and is designed for transshipping alumina from river to railway transport. Terra sigillata was a greasy clay, containing silica, alumina, chalk, magnesia and oxide of iron, found on the Greek islands of Lemnos, Melos and Samos. Technicians should use a double-ended grinder for rough polishing, abrasive paper for sanding, and diamond or alumina abrasives for final polishing. In addition, the acidity level is stable and is not permanently affected by exposure to moisture levels sufficiently high to remove halogen from a halided alumina. Examples from Classical Literature If it be desired to obtain the alumina as an earthy compact precipitate, bicarbonate of soda is used instead of carbonic acid. A substance best obtained by passing the vapour of bisulphide of carbon over pure alumina, at a bright red heat. Give the goods a mixed mordant of acetate of alumina and acetate of iron, followed by a bath of madder or of madder and fustic. The liquors are previously mixed with a little milk of lime, which frees them from ferric oxide, alumina, and silica. Lastly, aluminate of soda may be used as a mordant in place of red liquor or sulphate of alumina. Some of the alumina and iron oxide may occasionally be chemically combined, so as to form an iron spinel, or hercynite. It must be remembered that the sulfate of alumina is added only for the fresh lye put into the tank. The operator under such conditions first adds the sulfate of alumina, then the acid, using litmus paper as his indicator. It is a hydrated silicate of magnesium, mixed with lime, alumina, and a small quantity of iron. This mineral is known as lazulite and in composition is a silicate of soda and alumina with a small quantity of sodium sulphide. By decomposing a solution of crude sulphate of alumina with neutral or monobasic acetate of lead. When alumina is added to excess, the undissolved portion appears semi-transparent. Aluminum carbide yields alumina and methane, another hydro-carbon, the chief constituent of natural gas. The clarified solution of fluoride of sodium is then drawn off, and the alumina treated as above described. It is composed of silica, alumina, carbonate of lime, magnesia and oxide of iron. Quartz ought to exist in a state of hydrate, and Wavellite, not corundum, ought to be the state of alumina in granite. It was mentioned in the last chapter that a glaze free from alumina will devitrify or become dull. At the end of this time it must be washed, to extract the sulphate of alumina. Prices for alumina trihydrate have not gone up much in the last five years and are not expected to in the furore. The mordant for a full red may be acetate of alumina, of spec. Show More Sentences It usually contains a little silica, alumina, and oxide of iron. The affinity of alumina for the colouring matter is very remarkable. The alumina may be separated from the ferric oxide by potash-lye. Boil the paper with a mixture of alcohol and sulphate of alumina. Used in dyeing, chiefly for the preparation of acetate of alumina. Its salts are isomorphous with those of alumina and sesquioxide of iron. Chemically the topaz consists of alumina, silica and fluorine. Hobbs Bonded Fiber is working alongside DAI, impregnating the activated alumina into needle-punched woven substrates producing these innovative products. The sorbents in use can be single types such as an activated carbon, an impregnated carbon, or potassium permanganate impregnated alumina, or they can be used in blends. Find more words! 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Translations for alumina Use our Sentence Generator Nearby Words alum ALU alu Altus altruists altruistically aluminate aluminium aluminized aluminosilicate aluminous aluminum 7-letter Words Starting With a al alu alum alumi alumin