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Method for determining copper content in nickel-copper alloy

A nickel-copper alloy and copper content technology, applied in the field of metallurgy, can solve problems such as inaccurate detection results of copper content, avoid adverse effects of steelmaking process and rolling process, simple operation, improve steelmaking quality and rolling quality effect

Active Publication Date: 2020-06-19
LIUZHOU IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiment of the present invention provides a method for measuring the copper content in the nickel-copper alloy, so as to solve the problem of inaccurate detection results of the copper content in the nickel-copper alloy during the steelmaking process

Method used

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  • Method for determining copper content in nickel-copper alloy
  • Method for determining copper content in nickel-copper alloy
  • Method for determining copper content in nickel-copper alloy

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Embodiment

[0061] Embodiment: The method for measuring the copper content in the nickel-copper alloy adopts the following specific steps.

[0062] Use dilute nitric acid to dissolve the sample, ammonia water to separate the iron interfering elements, adjust the pH=5.5 in the filtrate, add excess ethylenediaminetetraacetic acid EDTA solution to complex all the elements that can be complexed, and then add thiourea, 1.10-di The combined masking agent composed of nitrogen phenanthrene (o-phenanthroline) and ascorbic acid selectively decomposes the Cu-EDTA complex, and finally titrates the released EDTA with zinc standard solution, and the copper content can be obtained by calculation.

[0063] (1) Sample dissolution: Weigh 0.5004g of nickel-copper alloy sample into a 200mL beaker, add 20mL (1+2, 1 part of concentrated nitric acid + 2 parts of water) nitric acid, heat until completely dissolved, remove and cool, and constant volume In a 250mL volumetric flask, the sample solution was obtained...

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Abstract

The embodiment of the invention provides a method for determining the copper content in a nickel-copper alloy. The method for determining the copper content in the nickel-copper alloy comprises the following steps of sample dissolution, interference separation, determination of the copper content, correction of precipitation adsorption and calculation of the copper content. In the interference separation step, ammonia water is used for separating iron interference elements; determination of the copper content comprises the following steps: selectively decomposing a Cu-EDTA complex by using a combined masking agent composed of thiourea, phenanthroline and ascorbic acid, and finally titrating released EDTA by using a zinc standard solution, thereby calculating the copper content. In the stepof correcting precipitation adsorption, diluted hydrochloric acid is used for dissolving precipitation to dissolve copper into a test solution, and ICP spectrum is used for measuring the content of copper in the test solution for correction. By means of the method for measuring the copper content in the nickel-copper alloy, the problem that at present, the detection result of the copper content in the nickel-copper alloy is inaccurate can be solved, and the relative standard deviation RSD is controlled within 0.5%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a method for measuring copper content in nickel-copper alloys, in particular to a method for separating iron-thiourea from ammonia water and releasing complexation capacity. Background technique [0002] Nickel and copper are the main alloying elements in steelmaking, and are widely used as alloying agents for weathering steel, structural steel, stainless steel and other steel types. At present, pure metals are used for steelmaking nickel and copper alloyed nickel and copper, so the price is expensive, which increases the cost of steelmaking. Nickel-copper alloy is a new alloy made by secondary melting of nickel, copper and iron. The alloy contains about 20% nickel, about 50% copper, and about 30% iron. It can be used for alloying steelmaking. Due to the interference of a large amount of iron elements in the sample, ferric iron and copper react to redissolve the copper generate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N21/73G01N21/78
CPCG01N31/16G01N21/73G01N21/78
Inventor 欧军陈海雷坚黄义伟胡麟刘祖强熊小庆
Owner LIUZHOU IRON & STEEL
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