Method for measuring luminosity of copper in iron ore

Abstract

The invention discloses a method for measuring luminosity of copper in iron ore. The method comprises the following steps: (1) weighing a sample; (2) adding acid to decompose the sample, dissolving salt, and diluting to obtain a constant volume; (3) dividing the sample into two parts, putting the two parts of sample in two volumetric flasks respectively, and adding citric acid solution in the two volumetric flasks respectively; (4) preparing a chromogenic solution and a reference solution; (5) transferring the chromogenic solution and reference solution into proper absorption vessels respectively, measuring absorbancy at the 600 nm position, and subtracting the absorbancy of the reference solution from the absorbancy of the chromogenic solution to obtain the absorbance value A; (6) drawing a standard curve to obtain the copper mass fraction corresponding to the absorbance value A. With adoption of the method, the reference ratio of the sample is changed, and the self solution without being added with color developing agent solution is adopted as the reference, so that the interference of colored solution and iron base is eliminated, the result is accurate, and high simpleness, convenience and easiness in operation are realized.

Description

technical field [0001] The invention belongs to the technical field of chemistry and chemical industry, in particular to a photometric method for measuring copper in iron ore. Background technique [0002] Copper generally exists as a residual element in steel. It is generally believed that the presence of copper reduces the mechanical properties and welding properties of steel, and causes hot embrittlement and cracking during hot working, which affects the quality of steel. Therefore, copper is the preferred material for various metals and metallurgical raw and auxiliary materials. Routine analysis items. Electrolytic gravimetric method, iodometric method, photometric method, atomic absorption method and ICP spectroscopic method are commonly used analytical methods, among which photometric method is the lowest cost analytical method, which is widely used in many small enterprises, and dicyclohexanone grass in photometric method Acyldihydrazone (BCO) photometry is the most ...

AI Technical Summary

Problems solved by technology

[0003] At present, when copper in iron ore is measured by photometry, it is all carried out according to the GB / T6370.35-86 method standard. In this method standard, the blank test solution is used as a reference when the sample solution is colorimetric. When the calibration curve is drawn, in When the determination range of the method is 0.01% to 1.0%, different amounts of iron base must be added to the calibration curve solutions except for the copper standard solution to match the amount of iron in the divided test solution according to the amount of different test solutions , and different amounts of bicyclohexanone oxalyldihydrazone (BCO) must be added. When measuring samples with multiple ranges of content, different copper standard solutions need to be added to draw a calibration curve. The operation is cumbersome, error-prone and time-consuming

When the high content of nickel, cobalt, chromium, etc. in the sample leads to the influence of colored ions in the sample solution, it will seriously affect the accuracy of the analysis