Vanadium-3 silicon

Vanadium—Silicon. Vanadium—shicon ahoy is made by the reduction of vanadium oxides with shicon in an electric furnace. Apphcation is essentiahy the same as that of the titanium ahoys. Vanadium ahoys sometimes offer the most economical way of introducing vanadium into molten steel. 

Nielsen FH, Sandstead HH. 1974. Are nickel, vanadium, silicon, fluorine, and tin essential for man. Ann J Clin Nutr 27 515-520. 

Bishop JKB (1990) Determination of barium in seawater using vanadium/silicon modifier and direct injection graphite furnace atomic absorption spectrometry. Anal Chem 62 553—557. 

Yam] Yamaguchi, M., Ymakoshi, Y, Mima G., Miscibility Gap in the Iron-Chromium-Metal (X Copper, Manganese, Molybdenum, Nickel, Vanadium, Silicon and Aluminium) System , Proc. Int. Conf. Sci. Technol. Iron Steel, Tokyo, 2, 1015-1019 (1971) (Phase Relations, Experimental, 35)... 

Elements such as chromium, manganese, nickel, tungsten, vanadium, silicon, and molybdenum are added to steels to obtain alloys with improved properties, for example strength, elasticity, hardness, abrasion resistance, rust resistance, and chemical resistance. 

Deficiency of T. e. can lead to characteristic deficiency symptoms or diseases, thus indicating the essential nature of these nutritional factors, e g. iodine is a component of the thyroid hormones and essential for thyroid function. Iodine deficiency is responsible for endemic goiter, and certain types of cretinism it can be avoided by addition of iodides to drinking water. Other T. e. are chromium, copper, fluoride, magnesium, manganese, nickel, vanadium, silicon, tin, selenium, zinc (see individual entries). 

Ammonium hydroxide precipitates uranium quantitatively at pH 4 or greater.- The presence of ammonium salts and macerated filter paper facilitate precipitation. Separation Is made from alkali metals, alkaline earths, and cations forming ammonia complexes. Repeated precipitations may be necessary to give sufficient separation. Phosphorus, vanadium, silicon, boron, aluminum. Iron and other elements of the ammonium hydroxide analytical group also are precipitated. Complexlng agents carbonate, oxalate, citrate, tartrate, fluoride, etc.. Interfere. 

As the sources of vanadium, silicon, and phosphorus, NH VO, colloidal silica "Snowtex 0" (Nissan Chem. Ind.) containing 20% Si02, and 85% were... 

Calibration of an arc or spark source is linear over three orders of magnitude, and detection limits are good, often within the region of a few micrograms per gram for elements such as vanadium, aluminum, silicon, and phosphorus. Furthermore, the nature of the matrix material composing the bulk of the sample appears to have little effect on the accuracy of measurement. 

Common alloying elements include nickel to improve low temperature mechanical properties chromium, molybdenum, and vanadium to improve elevated-temperature properties and silicon to improve properties at ordinary temperatures. Low alloy steels ate not used where corrosion is a prime factor and are usually considered separately from stainless steels. 

Residual Elements. In addition to carbon, manganese, phosphoms, sulfur, and silicon which are always present, carbon steels may contain small amounts of hydrogen, oxygen, or nitrogen, introduced during the steelmaking process nickel, copper, molybdenum, chromium, and tin, which may be present in the scrap and aluminum, titanium, vanadium, or zirconium, which may have been introduced during deoxidation. 

The red cake can be further purified by dissolving it in an aqueous solution of Na2C02- The iron, aluminum, and silicon impurities precipitate from the solution upon pH adjustment. Ammonium metavanadate then precipitates upon the addition of NH Cl and is calcined to give vanadium pentoxide of greater than 99.8% purity. 

Silicon Reduction. The preparation of ferrovanadium by the reduction of vanadium concentrates with ferrosiUcon has been used but not extensively. It involves a two-stage process in which technical-grade vanadium pentoxide, ferrosiUcon, lime, and fluorspar are heated in an electric furnace to reduce the oxide an iron alloy containing ca 30 wt % vanadium but undesirable amounts of siUcon is produced. The siUcon content of the alloy is then decreased by the addition of more V2O5 and lime to effect the extraction of most of the siUcon into the slag phase. An alternative process involves the... 

Steel is essentially iron with a small amount of carbon. Additional elements are present in small quantities. Contaminants such as sulfur and phosphorus are tolerated at varying levels, depending on the use to which the steel is to be put. Since they are present in the raw material from which the steel is made it is not economic to remove them. Alloying elements such as manganese, silicon, nickel, chromium, molybdenum and vanadium are present at specified levels to improve physical properties such as toughness or corrosion resistance. 

Electronic Grade Silicon (EGS). As the first step in the production of electronic grade silicon (EGS), an impure grade of silicon is pulverized and reacted with anhydrous hydrochloric acid, to yield primarily tricholorosilane, HSiClg. This reaction is carried out in afluidizedbed at approximately 300°C in the presence of a catalyst. At the same time, the impurities in the starter impure silicon reactto form their respective chlorides. These chlorides are liquid at room temperature with the exception of vanadium dichloride and iron dichloride, which are soluble in HSiCl3 at the low concentration prevailing. Purification is accomplished by fractional distillation. 

Known to be essential, but function unknown Silicon, vanadium, nickel, tin... 

Institute of Medicine, Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc, National Academies Press, Washington, 2001. 

In the production of titanium, the chlorination of rutile generates approximately 0.12 tons of waste for every ton of titanium tetrachloride produced. If ilmenite is directly chlorinated, the amount of waste is 1.5 tons for every ton of titanium tetrachloride. Large amounts of ferric chloride are produced along with volatile chlorides and oxychlorides (e.g., aluminum trichloride, silicon tetrachloride, carbon oxychloride, tin tetrachloride, vanadium tetrachloride, vanadium oxychloride) these can be removed by selective distillation. In flu-idized-bed chlorination, the build-up of liquid calcium chloride and magnesium chloride in the fluid bed interferes with the process of fluidization and hence these must be removed. 

C = carbon F = fluorine Si = silicon Cl = chlorine V = vanadium Fe = iron Cu = copper Br = bromine W = tungsten... 

Chlorine Trifluoride Tech. Bull. , Morristown, Baker Adamson, 1970 Incandescence is caused by contact with bromine, iodine, arsenic, antimony (even at -10°C) powdered molybdenum, niobium, tantalum, titanium, vanadium boron, carbon, phosphorus or sulfur [1], Carbon tetraiodide, chloromethane, benzene or ether ignite or explode on contact, as do organic materials generally. Silicon also ignites [2],... 

Aluminum, barium, beryllium, boron, dysprosium, erbium, europium, gadolinium, gallium, germanium, hafnium, holmium, lanthanum, molybdenum, neodymium, niobium, phosphorus, praseodymium, rhenium, samarium, scandium, silicon, strontium, tantalum, terbium, thulium, tin, titanium, tungsten, uranium, vanadium, ytterbium, yttrium, zirconium... 

The wavelength-dispersive x-ray spectroscopy method (ASTM D6376) provides a rapid means of measuring metallic elements in coke and provides a guide for determining conformance to material specifications. A benefit of this method is that the sulfur content can also be used to evaluate potential formation of sulfur oxides, a source of atmospheric pollution. This test method specifically determines sodium, aluminum, silicon, sulfur, calcium, titanium, vanadium, manganese, iron, and nickel. 

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