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Method for rapidly determining total quantity of rare earth in stainless steel

A technology for rapid determination of the total amount of rare earths, applied in the field of quantitative analysis of analytical chemistry, can solve problems such as environmental pollution, and achieve the effects of rapid and accurate determination, easy promotion, strong operability and practicability

Active Publication Date: 2016-09-07
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a rapid determination method for the total amount of rare earth in stainless steel in order to overcome the existing cumbersome operations such as repeated extraction and the use of volatile organic reagents, causing environmental pollution and other problems in the existing method for measuring the total amount of rare earth in stainless steel

Method used

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  • Method for rapidly determining total quantity of rare earth in stainless steel
  • Method for rapidly determining total quantity of rare earth in stainless steel
  • Method for rapidly determining total quantity of rare earth in stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of rapid determination method of rare earth total amount in stainless steel, comprises the following steps:

[0030] Step 1. Preparation of sample solution

[0031] Weigh 6 parts of stainless steel sample A with a nominal mass of 0.2 g and put them into conical flasks, add 5 mL of nitric acid with a mass fraction of 68% and 15 mL of hydrochloric acid with a mass fraction of 40%, heat and dissolve on a 250°C electric heating plate, Add 5mL of perchloric acid with a mass fraction of 75%, continue heating on a 400°C electric heating plate until perchloric acid fumes are emitted, and then add 1mL of hydrochloric acid with a mass fraction of 40% along the wall of the bottle in batches until no yellow smoke comes out. , add 5mL of perchloric acid with a mass fraction of 75% repeatedly, continue heating on a 400°C electric heating plate until perchloric acid fumes are emitted, and then add 1mL of hydrochloric acid with a mass fraction of 40% along the wall of the bottle...

Embodiment 2

[0043] A kind of rapid determination method of rare earth total amount in stainless steel, comprises the following steps:

[0044] Step 1. Preparation of sample solution

[0045] According to the steps in Example 1, the stainless steel standard sample (the stainless steel standard sample number is: Jizi No. 6, the nominal mass is 0.2g, and the total amount of rare earth is 0.012%) is independently tested for 6 times, and the stainless steel in Example 2 The samples were analyzed and determined independently for 6 times, and the results of the 6 analyzes were statistically processed. The results of the measurements are shown in Table 3.

[0046] Table 3 Example 2 Determination

[0047]

[0048] As can be seen from Table 3, the 6 times RSD (relative standard deviation) of the method of the present invention is 6.4%, and the difference between the measured sample and the standard value is 0.0015%, indicating that the method has higher accuracy and reliability.

Embodiment 3

[0050] A kind of rapid determination method of rare earth total amount in stainless steel, comprises the following steps:

[0051] Step 1. Preparation of sample solution

[0052] Accurately weigh 6 parts of stainless steel sample A with a nominal mass of 0.500g and put them into conical flasks, add 5mL of nitric acid with a mass fraction of 68% and 20mL of hydrochloric acid with a mass fraction of 40%, heat and dissolve on a 220°C electric heating plate Finally, add 10mL of perchloric acid with a mass fraction of 75%, continue heating on a 360°C electric heating plate until perchloric acid fumes are emitted, and then add 1mL of hydrochloric acid with a mass fraction of 40% along the wall of the bottle in batches until no perchloric acid is present. Acid smoke comes out, continue to repeat the operation steps of adding perchloric acid and hydrochloric acid several times until no yellow smoke comes out; when the solution is slightly cold, use ammonia water with a mass fraction o...

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Abstract

The invention provides a method for rapidly determining the total quantity of rare earth in stainless steel and relates to the technical field of quantitative analysis of analytical chemistry. The rapid determination method comprises the steps of sample solution preparation, sample determination, working curve drawing, result calculation and the like. According to the method provided by the invention, a sample matrix is separated from a rare earth element without extraction, back extraction, matrix precipitation or other tedious operations, and the rapid and accurate determination performed on the total quantity of the rare earth in the stainless steel can be realized on an economic and practical visible spectrophotometer. The method provided by the invention has stronger maneuverability and practicability, is convenient to popularize and has significance on the research, the development and the production of stainless steel grades.

Description

technical field [0001] The invention relates to the technical field of quantitative analysis of analytical chemistry, in particular to a rapid determination method for the total amount of rare earth in stainless steel. Background technique [0002] Rare earth is a strong deoxidizing and desulfurizing agent, known as the "vitamin" of steel. Although the role of rare earth elements in stainless steel was only reported in the early 1950s, the research work in this area has advanced by leaps and bounds. Rare earth elements have the functions of purifying molten steel, modifying inclusions, and microalloying. Adding rare earth elements to stainless steel is one of the effective measures to improve the quality of stainless steel and develop new varieties of products. Adding a certain amount of rare earth to stainless steel can increase the transverse impact toughness of stainless steel plate and seamless steel pipe by more than 50%, and at the same time, increase the corrosion res...

Claims

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Application Information

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IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 聂富强刘攀仝晓红
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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