Rapid Determination of Phosphorus in Ferromanganese, Ferromolybdenum and Ferrovanadium by Photometric Molybdenum Blue Method
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- Category: Molybdenum knowledge
- Published on 27 October 2015
- Written by xinyi
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Ferromanganese, ferromolybdenum and ferro vanadium are taken up by HNO3+HClO4 or HNO3+H2SO4, and the solution is heated until HCIO4 or H2SO4 fumes appear and diluted with water to a fixed volume.
An aliquot is pipeted out and phosphorus is separated from Mo by NH4OH precipitation and from V by 11202 and NH4OH.
The precipitate is dissolved in HNO3+H2SO4, and evaporated to dryness, but do not allow the residue to be baked.
After Fe has been reduced by 10% NaHSO3, hydrazine sulfate and ammonium molybdate mixture (2% ammonium molybdate solution in 30% sulfuric acid 25 ml +0.15% hydrazine sulfate solution 15 ml +H2O 65 ml) are added to the solution, which is then heated for a proper time and diluted to a fixed volume with water, and the absorption of molybdenum blue is measured.
In this improved method, the acid concentration when phosphorus begins to be colored has been controlled, and the way to exclude disturbing influences of diverse elements has been examined. About an hour is needed for an analysis.
Ferro molybdenum is an important iron-molybdenum alloy, with a molybdenum content of 60-75%. It is the main source for molybdenum alloying of HSLA steel.
Ferromanganese, a ferroalloy with high content of manganese, is made by heating a mixture of the oxides MnO2 and Fe2O3, with carbon, usually as coal and coke, in either a blast furnace or an electric arc furnace-type system, called a submerged arc furnace. The oxides undergo carbothermal reduction in the furnaces, producing the ferromanganese. Ferromanganese is used as a deoxidizer for steel.
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