Method for determining tungsten content in ferroniobium

A technology of tungsten content and ferroniobium, which is applied in the field of chemical detection, achieves the effects of saving reagents and time, saving labor costs, and good stability

Inactive Publication Date: 2014-09-24
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the content of tungsten trioxide in ferro-niobium concentrate, there is an analysis method - thiocyanate spectrophotometry, which can be use

Method used

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  • Method for determining tungsten content in ferroniobium
  • Method for determining tungsten content in ferroniobium
  • Method for determining tungsten content in ferroniobium

Examples

Experimental program
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Effect test

preparation example Construction

[0018] 1) According to the preparation method of the sample solution in step A, prepare 6 blank sample solutions and transfer them into volumetric flasks;

[0019] 2) Dry the standard product ditungsten trioxide at 100~120℃ for 50~70min, weigh 0.1262g accurately, dissolve it with 30ml of sodium hydroxide solution, transfer it into a 100ml volumetric flask, and use distilled water or secondary deionized water to make up the volume Obtain 1ml of tungsten standard stock solution a containing 100μg, pipette 50ml of tungsten standard stock solution a into a 500ml volumetric flask, and use distilled water or secondary deionized water to obtain 1ml of tungsten standard stock solution b containing 10µg;

[0020] 3) Add 0ml, 1.00ml, 3.00ml, 4.00ml and 5.00ml of tungsten standard stock solution b into the volumetric flasks of the aforementioned 6 blank sample solutions, and add distilled water or secondary deionized water to make up the volume to obtain the tungsten standard solution; ...

Embodiment 1

[0047] Reagent used in the present invention and preparation thereof:

[0048] 1. Hydrofluoric acid (ρ1.15g / mL);

[0049] 2. Nitric acid (ρ1.42g / mL);

[0050] 3. Phosphoric acid (ρ1.69g / mL);

[0051] 4. Sulfuric acid (1+1);

[0052] 5. The above reagents, hydrofluoric acid, nitric acid, phosphoric acid, and sulfuric acid are all analytical reagents, and the water is secondary deionized water.

Embodiment 2

[0054] 1. The preparation of the standard stock solution used in the working curve:

[0055]A. Weigh 0.1262g of tungsten trioxide that has been dried at 110°C for 1 hour, add 30mL of sodium hydroxide solution (200g / L), heat to dissolve, cool, transfer to a 100mL volumetric flask, and dilute to the mark. 1 mL of this solution contains 100 μg of tungsten.

[0056] B. Pipette 50mL of the standard solution in A into a 500mL volumetric flask, and shake to volume with water. 1 mL of this solution contains 10 μg of tungsten.

[0057] 2. Preparation of standard solution for working curve

[0058] 2A. According to the method in step 1, dissolve 6 parts of reagent blank solution, transfer 6 parts of reagent blank solution to a 100mL volumetric flask, and temporarily keep the volume constant.

[0059] 2B. Add 0 mL, 1.00 mL, 2.00 mL, 3.00 mL, 4.00 mL, and 5.00 mL of the B standard stock solution in step 2 to the 6 solutions obtained in step A, add distilled water to volume and shake we...

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Abstract

The invention discloses a method for determining tungsten content in ferroniobium. The method comprises steps of pre-treating, preparing a standard solution and determining. The method comprises the specific steps of adding hydrofluoric acid into a sample to be tested; dropwise adding concentrated nitric acid and adding concentrated phosphoric acid and sulfuric acid; dissolving the test sample and making up to the volume; and uniformly shaking for later detection; drawing a tungsten spectral line intensity-mass fraction working curve on a plasma atomic emission spectrometer by a prepared tungsten standard solution; and analyzing the sample to be tested by using the curve to obtain the tungsten content in the ferroniobium. According to the method, a plasma atomic emission spectrometry is used for determining the tungsten content in the ferroniobium to make up the technical blank of a detection project; reagents and time are saved and the labor cost is also saved; the tungsten content in the ferroniobium can be rapidly and accurately analyzed; the checking requirements of products of iron and steel enterprises in a ferroniobium utilization process are met. The method is convenient and rapid to operate, the analyzing cost is low; a determination result has good stability, repeatability and accuracy; the determination requirements on the tungsten content in the daily ferroniobium can be met.

Description

technical field [0001] The invention belongs to the technical field of chemical detection, and in particular relates to a method for measuring tungsten content in ferroniobium. Background technique [0002] With the continuous progress of material science, ferroniobium has shown great advantages in the fields of aerospace, superconductivity, metallurgy, chemical industry and medical treatment. In the metallurgical industry, ferroniobium is mainly used in the smelting of alloy steel, as an alloying element additive and as a coating for stainless steel welding electrodes. Kunming Iron and Steel often uses ferroniobium in the smelting process of steel products, so the continuous improvement of the analysis and determination method of tungsten content, which is an important indicator of the quality of ferroniobium products, becomes particularly important. [0003] At present, there is no national standard or industry standard for the determination of tungsten content in ferroni...

Claims

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Application Information

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IPC IPC(8): G01N21/73G01N1/28
Inventor 陈涛陶俊赵绥
Owner WUKUN STEEL
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