Determination method for content of trace boron in iron oxide powder

Abstract

The invention discloses a determination method for the content of trace boron in iron oxide powder. The method comprises the following steps: weighing iron oxide powder, putting the iron oxide powder into a quartz beaker, adding hydrochloric acid, then carrying out low-temperature heating for dissolving until a solution is almost dry, carrying out cooling and then adding hydrochloric acid to dissolve a medium; transferring an obtained solution to a separating funnel, carrying out flushing, combining washing liquor into the separating funnel, adding 4-methyl-2-pentanone, carrying out excitation, then carrying out standing for layering, putting a water phase into the quartz beaker for concentration, then transferring a concentrate to a volumetric flask and diluting the concentrate to full scale; acquiring a working curve from a standard boron solution; determining the iron oxide powder sample on a spectrometer, measuring spectral line intensity of elemental boron under the condition of no interference by microscale iron and carrying out comparison so as to obtain the content of boron in the iron oxide powder sample; and drafting a relation curve of the mass percentage content of elemental boron and the corresponding spectral line intensity of elemental boron and acquiring the percentage content of elemental boron according to the spectral line intensity of elemental boron. The method can conveniently determine the content of trace boron, improves work efficiency, eliminates interference by an iron matrix and enhances determination precision of the content of trace boron.

Description

technical field [0001] The invention relates to a method for determining trace boron content in iron oxide powder. Background technique [0002] Iron oxide powder is the main raw material for making magnetic materials. Studies have shown that when the content of boron in iron oxide powder exceeds a certain range, it will cause ferrite crystallization when sintered into magnetic materials, which will affect the quality of magnetic material products. Therefore, the content of boron element in iron oxide powder is generally controlled at less than 10ppm. At present, the methods for determining boron content mainly include gravimetric method, volumetric method, and spectrophotometric method, in addition to oscillographic polarography, atomic absorption method, ICP-AES (inductively coupled plasma emission spectrometer) method, etc. Curcumin colorimetry is generally used for the determination of trace boron content. This method is cumbersome to process, and the iron oxide powder ...

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Problems solved by technology

Curcumin colorimetry is generally used for the determination of trace boron content. This method is cumbersome to process, and the iron oxide powder turns yellow after being dissolved in acid. The contrast color interferes greatly, and the blank is also very high. It is difficult to accurately determine the content of iron oxide powder. Trace boron content of

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