Method for determining niobium element content in ferroniobium

An element content and element technology, applied in the field of analytical chemistry, can solve the problems of long operation process and narrow measurement range, and achieve the effect of simple operation, enlarged measurement range and simple operation.

Inactive Publication Date: 2009-12-23
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It mainly solves the problems of long operation process and narrow measurement range, determines the appropriate sample pretreatment method and instrument analysis conditions, and realizes efficient, fast and accurate measurement of niobium in ferroniobium

Method used

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  • Method for determining niobium element content in ferroniobium
  • Method for determining niobium element content in ferroniobium
  • Method for determining niobium element content in ferroniobium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Weigh 0.2000g sample (GSB 03-2202-2008 Sinosteel Jitie production) and place it in a 400mL polytetrafluoroethylene beaker, add 5mL of deionized water to wet the sample, add 5mL of hydrofluoric acid and 5mL of nitric acid, Heat on a 180°C electric heating plate to slowly dissolve the sample. After the sample is completely dissolved, remove it and cool it down. After cooling to room temperature, set the volume in a 100mL plastic volumetric flask, dilute to the mark with deionized water, and mix well.

[0039] Treat the blank sample in the same way, add different concentrations of niobium standard solution, add water to make up to 100mL, measure the spectral intensity of niobium on the ICP emission spectrometer (see Table 1 for the measurement conditions of the spectrometer), and draw the working curve. Then measure the spectral intensity of niobium in the solution to be tested, obtain its concentration from the working curve, and obtain the content of niobium in the sample...

Embodiment 2

[0047] Weigh 1.0000g sample (unknown sample) and place it in a 400mL polytetrafluoroethylene beaker, add 10mL deionized water to wet the sample, add 10mL hydrofluoric acid and 10mL nitric acid, and heat on a 220°C electric heating plate to make The sample dissolves slowly. After the sample is completely dissolved, take it out and cool it down. After cooling to room temperature, set the volume in a 100mL plastic volumetric flask, dilute to the mark with deionized water, and mix well.

[0048] The blank sample is processed in the same way, adding different concentrations of niobium standard solutions, adding water to 100mL, measuring the spectral intensity of niobium on an ICP emission spectrometer (the measuring conditions of the instrument are the same as in Example 1), and drawing a working curve. Then measure the spectral intensity of niobium in the solution to be tested, obtain its concentration from the working curve, and obtain the content of niobium in the sample through ...

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Abstract

The invention relates to a method for determining niobium element content in ferroniobium, which comprises the following steps: a sample is weighted and put in a polytetrafluoroethylene beaker and deionized water is added for humidifying the sample; hydrofluoric acid and nitric acid are added into the sample, and then are heated so that the sample is slowly dissolved; after the sample is completely dissolved, the breaker is taken down and cooled; after the sample is cooled to room temperature, the volume is metered; reagent blank without the sample is adopted, and then standard solution of niobium element with different volumes is added, and finally deionized water is added and the volume is metered; spectral line strength of niobium element in standard solution is determined under the working condition of a setting inductively coupled plasma atomic emission spectrometer and a working curve is drawn; the spectral line strength of niobium element in ferroniobium sample solution to be determined is determined, and then a computer automatically determines the concentration of niobium element in sample solution according to the working curve. The method mainly solves problems of long operational process, narrow measuring range and the like, determines appropriate sample processing methods and analytic conditions of instruments, and realizes effectively, rapidly and accurately measuring niobium element in ferroniobium.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, more specifically it is a method for determining the content of niobium in ferroniobium. Background technique [0002] Ferroniobium alloy is a very important niobium product, which is widely used in low alloy steel, structural steel, stainless heat-resistant steel, wear-resistant alloy cast iron, etc. Niobium can refine grains in steel, reduce the overheating sensitivity and temper brittleness of steel, improve the strength and toughness of steel, and improve the intergranular corrosion performance of austenite. Adding ferroniobium alloy into steel to make alloy steel is a commonly used method. Therefore, it is of great significance to accurately know the niobium content in ferroniobium. [0003] At present, the measurement of niobium in ferroniobium mainly adopts gravimetric method (chromatographic separation gravimetric method on paper, tannic acid hydrolysis gravimetric method), and the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/73
Inventor 李洁于录军张春兰卢文祺刘秀莹吴秀云陆珂
Owner 武钢集团有限公司
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