Method for measuring phosphorus in silicon iron by using photometric method

Abstract

The invention relates to a method for measuring phosphorus in silicon iron by using a photometric method. The method comprises a control experiment and a sample determination experiment, wherein the control experiment comprises the following steps: taking phosphorus standard solutions with same concentration and gradient volume respectively, adding the phosphorus standard solutions into a beaker in which quantitative pure iron powder and quantitative pure aluminum foil or pure aluminum powder are added in advance, dissolving a to-be-measured sample by adopting nitric acid and hydrofluoric acid, oxidizing to orthophosphoric acid by using perchloric acid with smoke emission until hydrofluoric acid is cleaned and dried, transferring into a beaker in tall form, adding nitric acid immediately, adding sodium nitrite until a brown precipitate disappears, boiling for 10 seconds, adding ammonium molybdate and tartaric acid, shaking, adding iron fluoride, and reducing into phosphomolybdenum blue by using stannous chloride, measuring absorbance respectively at 680nm in a spectrophotometer by taking water as a reference, and drawing a working curve or calculating a regression equation; and the sample determination experiment comprises the following steps: performing the same experimental steps in the beaker, then measuring the absorbance at 680nm in the spectrophotometer, and contrasting to obtain the phosphorus content by comparing with the working curve or the regression equation of the control experiment.

Description

technical field [0001] The invention relates to the field of ferroalloy analysis, in particular to a photometric method for determining phosphorus in ferrosilicon. Background technique [0002] Ferrosilicon is the raw material for steelmaking. Ferrosilicon is an alloying agent. At the same time, it is used as a deoxidizer for steelmaking. Ferrosilicon can also be used as a reducing agent in the production of ferromolybdenum, ferrovanadium and other ferroalloys. It is also an alloy additive and is widely used in the metallurgical industry. . Phosphorus, as a harmful element in ferrosilicon, is brought into steel at the same time. If the phosphorus content is too high, it will affect the plasticity and toughness of the steel, and it is prone to cold and brittleness. The phosphorus content is more important in the condensation process, and the phosphorus content also determines the grade and price of ferrosilicon. Therefore, the accurate determination of phosphorus in ferrosi...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a more rapid, accurate and efficient method for determining the phosphorus content in ferrosilicon, so as to solve the problem of time-consuming and difficult control of sample dissolution conditions when measuring phosphorus in ferrosilicon in the existing method, and The amount of perchloric acid is large, the cost is high, and at the same time, it causes the problem of unstable measurement data

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