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Measurement method for iron content in iron-copper-tin ternary prealloy powder

A technology of pre-alloyed powder and determination method, which is applied in the direction of chemical analysis by titration method, which can solve the problems of residual nitric acid and affecting the determination of the end point of reduction reaction titration, etc.

Inactive Publication Date: 2017-12-12
泉州众志金刚石工具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It usually uses hydrochloric acid plus nitric acid to dissolve the sample. However, this method has the following problems: there may be residues when removing excess nitric acid, which affects the reduction reaction and the determination of the titration end point.

Method used

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  • Measurement method for iron content in iron-copper-tin ternary prealloy powder
  • Measurement method for iron content in iron-copper-tin ternary prealloy powder
  • Measurement method for iron content in iron-copper-tin ternary prealloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First, weigh 0.1000g of reduced iron powder into a 250mL Erlenmeyer flask, add 10mL of hydrochloric acid solution, 5mL of hydrogen peroxide, until the sample is completely dissolved, add 30mL of water, heat to boiling, remove excess hydrogen peroxide, drop while hot Add SnCl 2 solution until the solution is colorless and excess 1-2 drops.

[0032] Next, add 10mL HgCl 2 Saturated solution, mix well, let stand for 5min.

[0033] Finally, add 20mL of water, 20mL of sulfur-phosphorus mixed acid solution, 4-5 drops of sodium diphenylamine sulfonate indicator, and titrate with potassium dichromate standard solution. The solution turns from green to blue-purple as the end point.

[0034] Calculation formula:

[0035] In the formula:

[0036] ω(Fe)—mass fraction of iron in the sample;

[0037] c(1 / 6K 2 Cr 2 o 7 )—concentration of substance in potassium dichromate standard titration solution, mol / L;

[0038] V—the volume of potassium dichromate standard titration solu...

Embodiment 2

[0046] First, weigh 0.4000g of reduced iron powder, 0.0800g of elemental copper powder, and 0.0300g of elemental tin powder in the same 250mL conical flask, add 10mL of hydrochloric acid solution, 10mL of hydrogen peroxide, and wait until the sample is completely dissolved, add 30mL of water , heated to boiling, remove excess hydrogen peroxide, dropwise add SnCl 2 solution until the solution is colorless with 1-2 drops in excess.

[0047] Next, cool to room temperature, and dilute to a 100mL volumetric flask.

[0048] Next, pipette 10mL test solution, add 10mL HgCl 2 Saturated solution, mix well, let stand for 5min.

[0049] Finally, add 20mL of water, 20mL of sulfur-phosphorus mixed acid solution, 4-5 drops of sodium diphenylamine sulfonate indicator, and titrate with potassium dichromate standard solution. The solution turns from green to blue-purple as the end point. Calculation formula:

[0050] In the formula:

[0051] ω(Fe)—mass fraction of iron in the sample;

...

Embodiment 3

[0061] Step 2. Weigh 0.2000g of the powder to be tested in a 250mL Erlenmeyer flask, add 10mL of hydrochloric acid solution, 5mL of hydrogen peroxide, until the sample is completely dissolved, add 30mL of water, heat to boiling, remove excess hydrogen peroxide, while hot Add SnCl dropwise 2 solution until the solution is colorless and excess 1-2 drops.

[0062] Step 3, cool to room temperature, and dilute to a 100mL volumetric flask.

[0063] Step 4, pipette 10mL test solution, add 10mL HgCl 2 Saturated solution, mix well, let stand for 5min.

[0064] Step five, add 20mL water, 20mL sulfur-phosphorus mixed acid solution, 4-5 drops of sodium diphenylamine sulfonate indicator, titrate with potassium dichromate standard solution, the solution turns from green to blue-purple as the end point.

[0065] Calculation formula:

[0066] In the formula:

[0067] ω(Fe)—mass fraction of iron in the sample;

[0068] c(1 / 6K 2 Cr 2 o 7 )—concentration of substance in potassium dich...

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Abstract

The invention discloses a measurement method for iron content in iron-copper-tin ternary prealloy powder. In hydrochloric acid solution, Fe3<+> is recovered into Fe<2+> by using SnCl2, then HgCl2 is added to oxidize the excess SnCl2, sodium diphenylaminesulfonate is used as an indicator, and potassium dichromate standard solution is used for titration. The method provided by the invention can be quick in measurement, and accurate in measurement result.

Description

technical field [0001] The invention relates to the technical field of iron content determination, in particular to a method for determining iron content in iron-copper-tin ternary prealloyed powder. Background technique [0002] The production process of iron-copper-tin pre-alloyed powder is mainly obtained through smelting and water atomization. It is mainly used in diamond tools. It has high strength and high hardness mechanical properties, good holding force on diamond, and good wear resistance. [0003] By measuring the iron content and copper content in the iron-copper-tin pre-alloyed powder, analyze whether its components are consistent with the design components. At present, the commonly used determination method is mainly to qualitatively analyze the component content of each component through scanning electron microscope and electron probe, but it cannot be very accurate qualitative analysis. [0004] Some even use chemical method to titrate the iron content. It ...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 赵宇张文忠付圣利
Owner 泉州众志金刚石工具有限公司
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