Method for measuring vanadium content of silicon ferrovanadium

A technology of silicon vanadium iron and vanadium iron, which is applied in the field of determination of vanadium content of vanadium alloys, can solve the problems of difficult sample handling, unsuitable analysis, serious measurement interference, etc.

Active Publication Date: 2012-06-20
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition of ferrovanadium and ferrosilicon vanadium is very different, especially because the silicon content in the sample is very high, it is very difficult to handle the sample, and

Method used

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  • Method for measuring vanadium content of silicon ferrovanadium
  • Method for measuring vanadium content of silicon ferrovanadium
  • Method for measuring vanadium content of silicon ferrovanadium

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0036] Take by weighing 0.20g (accurate to 0.0001g) ferrosilicon vanadium sample for test in polytetrafluoroethylene beaker (for synthetic standard sample, weigh a certain amount of vanadium standard sample and a certain amount of ferrosilicon standard sample as table 1 Synthetic standard sample), add 15mL concentration of 66% nitric acid, dropwise add concentration of 40% hydrofluoric acid 5mL, heat to dissolve the sample completely, add 6mL concentration of 98% sulfuric acid, heat to just smoke. Remove the Teflon beaker from the heating device, cool it, transfer the solution to a 500mL conical flask, add 10mL of 85% phosphoric acid, heat to smoke for 1 to 2 minutes, and remove the Teflon from the heating device Cool the beaker to room temperature, add 70mL of sulfuric acid with a concentration of 14%, shake well, cool to below 45°C, add potassium permanganate solution with a concentration of 40g / L until a stable red color appears, let it stand for 3min, add 10mL of sulfuric a...

example 2

[0048] Take by weighing 0.20g (accurate to 0.0001g) ferrosilicon vanadium sample for test in polytetrafluoroethylene beaker (for synthetic standard sample, take by weighing a certain amount of vanadium standard sample and a certain amount of ferrosilicon standard sample as table 2 Synthetic standard sample), add 12mL of nitric acid with a concentration of 60%, dropwise add 3mL of hydrofluoric acid with a concentration of 36%, heat to dissolve the sample completely, add 5.5mL of sulfuric acid with a concentration of 91%, and heat until just smoking . Remove the Teflon beaker from the heating device, cool it, transfer the solution to a 500mL conical flask, add 9mL of 80% phosphoric acid, heat to smoke for 1 to 2 minutes, remove the Teflon from the heating device Cool the beaker to room temperature, add 75mL of sulfuric acid with a concentration of 13%, shake well, cool down to below 45°C, add potassium permanganate solution with a concentration of 20g / L until a stable red color ...

example 3

[0056] Take by weighing 0.20g (accurate to 0.0001g) ferrosilicon-vanadium sample for test in polytetrafluoroethylene beaker (for synthetic standard sample, weigh a certain amount of vanadium-iron standard sample and a certain amount of ferrosilicon standard sample as table 3 Synthetic standard sample), add 20mL of nitric acid with a concentration of 68%, add 6mL of hydrofluoric acid with a concentration of 38% drop by drop, heat to dissolve the sample completely, add 6.5mL of sulfuric acid with a concentration of 95%, and heat until just smoking . Remove the Teflon beaker from the heating device, cool it down, transfer the solution to a 500mL conical flask, add 11mL of 82% phosphoric acid, heat to smoke for 1 to 2 minutes, remove the Teflon from the heating device Cool the beaker to room temperature, add 65mL of sulfuric acid with a concentration of 15%, shake well, cool to below 45°C, add potassium permanganate solution with a concentration of 50g / L until a stable red color a...

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Abstract

The invention provides a method for measuring the vanadium content of silicon ferrovanadium, which includes the steps: (a) mixing silicon ferrovanadium and nitric acid, adding hydrofluoric acid into mixture, heating the mixture to completely dissolve the silicon ferrovanadium, adding sulfuric acid into the mixture, heating the mixture until the moment of smoking, and afterwards cooling the mixture; (b) adding phosphoric acid into the mixture, heating the mixture until smoking, keeping smoking for a period of time and cooling the mixture; (c) adding sulfuric acid into the mixture, cooling the mixture, adding potassium permanganate solution into the mixture until appearing of stable red and allowing the mixture to stand for a period of time; (d) adding urea solution into the mixture, dripping sodium nitrite solution into the mixture to reduce excessive potassium permanganate, excessively adding 1-3 drops of sodium nitrite solution and then allowing the mixture to stand for a period of time; (e) adding N-phenyl o-aminobenzoic acid indicators into the mixture and then dripping ammonium ferrous sulfate standard solution into the mixture to obtain a titration endpoint when the mixture is light green; and (f) computing the vanadium content according to the formula.

Description

technical field [0001] The invention relates to a method for measuring the vanadium content of a vanadium alloy, in particular to a method for measuring the vanadium content of ferrosilicon vanadium. Background technique [0002] In recent years, with the continuous increase in demand for vanadium-containing steel, the demand for ferrovanadium used in smelting vanadium-containing steel in the iron and steel industry has also increased. However, the supply of ferrovanadium in the market is in short supply, and the price is relatively expensive. Therefore, seeking ferrovanadium substitutes has become the goal of enterprises. Ferro-silicon vanadium is an economical and applicable ferro-vanadium substitute. [0003] The content range of vanadium in ferrosilicon vanadium is 25% to 50%, and the range of silicon content is 10% to 40%. At present, there is no mature analysis method and corresponding standard material for ferrosilicon vanadium. The composition of ferrovanadium and...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 唐世禄
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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