Sample dissolving method for testing titanium in pig iron and cast iron through diantipyrylmethane colorimetric method

Abstract

The invention discloses a sample dissolving method for testing titanium in pig iron and cast iron through a diantipyrylmethane colorimetric method. The method comprises the steps that S1, 0.5000 g of samples are weighed and put in a 250 ml triangular beaker, 25 ml of sulfuric acid and nitric acid mixed acid is added for dissolution, cooling is performed after dissolution and drainage, 15 ml of 1:1 sulfuric acid is added, concentrated nitric acid is added dropwise, cooling is performed after silicate precipitation, 50 ml of water is added for dissolving salt, and the mixture is boiled till big bubbles are produced, taken down for cooling and filtered into a 100 ml volumetric flask for settlement and dissolution; S2, 10 ml of mother liquor is sucked and put in a 50 ml volumetric flask; S3, 10 ml of ascorbic acid is added, and the mixture is placed for 5 minutes; S4, 1.5 ml of 1:1 hydrochloric acid is added; S5, settlement and dissolution are performed for 5 minutes, then colorimetry is carried out, the wave length is 420 mm, and the reference solution is a 5:95 hydrochloric acid solution. By the adoption of the method, the content of titanium in pig iron and cast iron can be determined precisely.

Description

technical field [0001] The invention relates to the technical field of chemical detection, in particular to a method for dissolving titanium in pig iron and cast iron by a diantipyrine methane colorimetric method. Background technique [0002] The titanium content of titanium in iron and cast iron has a great influence on the physical properties of castings. At present, foundry manufacturers often use aqua regia to dissolve samples in the method of dissolving titanium in pig iron and cast iron. The dissolution of the sample is not complete, resulting in the content of titanium On the low side. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for dissolving titanium in pig iron and cast iron by an accurate diantipyrine methane colorimetric method, so as to overcome the deficiencies in the prior art. [0004] The technical solution that the present invention solves its technical problem adopts is: diantipy...

AI Technical Summary

Problems solved by technology

[0002] The titanium content of titanium in iron and cast iron has a great influence on the physical properties of castings. At present, in the method of dissolving titanium in pig iron and cast iron, foundry manufacturers often dissolve samples with aqua regia, and the dissolution of the samples is not complete, resulting in the content of titanium low