Method for detecting iron content in W-Ni-Fe alloy

Abstract

The invention relates to a method for detecting iron content in metallurgic products, in particular to a method for detecting the iron content in W-Ni-Fe alloy. The method comprises the following steps: (1) adding sulfuric acid and ammonium sulfate, or HF acid and nitric acid into a W-Ni-Fe alloy sample, heating the sample until the sample is completely decomposed, and cooling the sample; adding water and coprecipitator into the sample, regulating the sample to ammonia and excessive with ammonia water to ensure that the pH of the solution is more than or equal to 8, washing the precipitate in an original beaker, and transferring the solution to a volumetric flask; and (2) adding solution of sulfosalicylic acid (200g / L) in the test solution, dripping the ammonia water to the test solution until the test solution is turned to stable yellow, diluting the solution with water to a level, and shaking up the solution; and detecting the absorbance at the position of wavelength 420nm. The method has simple and easy operation, small interference and good accuracy, and can well meet the requirement of iron content detection in the W-Ni-Fe alloy (mass percentage is between 1 and 10 percent).

Description

Technical field The invention relates to a method for measuring iron content in metallurgical products, in particular to a method for measuring iron content in a tungsten-nickel-iron alloy. Background technique At present, the determination method of iron in tungsten-nickel-iron alloys is the phenanthroline spectrophotometric method. This method has certain interference in the determination of nickel in samples, and the accuracy of the method cannot meet the determination requirements of iron in tungsten-nickel-iron alloys. In addition, there is an inductively coupled plasma emission spectroscopy method for the determination of iron in tungsten-nickel-iron alloys. This method is simple, fast and accurate, but requires a more expensive inductively coupled plasma emission spectrometer. Therefore, it is necessary to develop a method that is simple and easy to implement, has less interference, good accuracy, and can satisfy the determination of iron content in tungsten nickel iron ...

AI Technical Summary

Problems solved by technology

At present, the determination method of iron in tungsten-nickel-iron alloy has o-phenanthroline spectrophotometry, which has certain interference in the determination of nickel in the sample, and the accuracy of the method cannot meet the determination requirements of iron in tungsten-nickel-iron alloy

In addition, there is an inductively coupled plasma emission spectrometry method for the determination of iron in tungsten-nickel-iron alloys. This method is simple, fast, and has good accuracy, but it needs to be equipped with a more expensive inductively coupled plasma emission spectrometer.