Method for determining contents of Nb and P in high-phosphorus ferroniobium

Abstract

The invention belongs to the technical field of chemical element detection, and relates to a method for determining the contents of Nb and P in high-phosphorus ferroniobium. The detection method comprises the following steps: preparing a niobium standard solution and a phosphorus standard solution; taking a ferroniobium sample, adding the ferroniobium sample into a ceramic crucible coated with zirconium oxide on the inner layer, melting by using sodium peroxide, leaching by using nitric acid, dissolving by using hydrofluoric acid, dissolving in a water bath, fixing the volume, and taking as amother solution after fixing the volume; after the spectral line is determined, establishing a standard curve according to standard values and spectral intensities of niobium and phosphorus contents in the ferroniobium standard sample; and calculating the contents of Nb and P in the sample according to the standard curve. According to the method, the defects of a traditional detection method are overcome, operation is easy and convenient, niobium and phosphorus detection sample pretreatment methods are the same, the steps of repeated weighing and sample pretreatment are reduced, and Nb and P in the high-phosphorus ferroniobium can be rapidly, accurately and simultaneously determined.

Description

technical field [0001] The invention belongs to the technical field of chemical element detection, and in particular relates to a method for determining the contents of Nb and P in high-phosphorus ferroniobium. Background technique [0002] Ferroniobium is an iron alloy whose main components are niobium and iron. It also contains aluminum, silicon, carbon, sulfur, phosphorus and other impurities. Ferroniobium is an alloy material mainly used for smelting high-temperature (heat-resistant) alloys, stainless steel, and high-strength low-alloy steel; niobium has a strong inhibitory effect on austenite recrystallization of steel, making steel Under this condition, rolling is effectively controlled, and the strengthening and toughening effect of controlled rolling is very significant. Adding niobium can prevent the grain growth of steel at high temperature, refine the structure of steel, and improve the strength, toughness and creep properties of steel, etc. [0003] Therefore,...

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Problems solved by technology

To detect the chemical composition of ferroniobium, the current national standard chemical analysis method is commonly used at present, to analyze niobium, titanium, silicon, aluminum, phosphorus, etc. steel demand

[0004] Moreover, in the existing detection methods of niobium and phosphorus in ferroniobium, the detection of niobium and phosphorus needs to treat the samples separately and detect them separately

The detection of niobium, such as chromatographic separation gravimetric method, involves toxic reagents in the detection process, which is not conducive to the health of the detection personnel and environmental protection; at the same time, the analysis method has complicated operation procedures, long analysis period and low detection efficiency

The detection of phosphorus content, such as using the precipitation method to separate phosphorus from other elements, also faces the defects of complex operation process, long analysis period and low detection efficiency of the analysis method

There are also other elemental analysis and detection methods, such as gravimetric determination of tantalum, EDTA volumetric determination of aluminum, molybdenum blue spectrophotometric determination of phosphorus and other traditional chemical analysis methods for single element determination of impurity elements contained in ferroniobium, all of which have complicated operations, Disadvantages such as long inspection cycle, toxic reagents and high consumption, high labor intensity and low efficiency

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