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Copper reagent separation-EDTA titration method for measuring magnesium content of aluminum alloy

A copper reagent, aluminum alloy technology, which is applied in material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the large influence of iron determination, human and environmental damage, and large errors. and other problems, to achieve the effect of reducing operation steps, easy operation, accurate and stable measurement results

Inactive Publication Date: 2015-04-29
BEIJING INST OF NONFERROUS METALS & RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, iron has a relatively large impact on the determination, and the error is also relatively large. Because potassium cyanide is used, it is a highly toxic reagent, which has serious harm and pollution to people and the environment.

Method used

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  • Copper reagent separation-EDTA titration method for measuring magnesium content of aluminum alloy
  • Copper reagent separation-EDTA titration method for measuring magnesium content of aluminum alloy
  • Copper reagent separation-EDTA titration method for measuring magnesium content of aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1 is to the detection of magnesium content in the aluminum alloy sample

[0042] 1. Determine the titer of magnesium

[0043] 1) Weigh the standard substance

[0044] Weigh a standard substance with similar magnesium content in the sample to be tested, its weight is shown in Table 1, and other components meet: iron content<0.0025wt%, silicon content<0.0010wt%, zinc content<0.0020wt%, manganese content< 0.0015wt%, copper content <0.0020wt%.

[0045] Table 1

[0046] Standard substance name

Magnesium content (wt%)

Sample weight (g)

aluminum alloy

4.48

0.5006

[0047] aluminum alloy

5.16

0.5031

[0048] 2) Dissolution of standard substances

[0049] Put the weighed standard substance in a 250ml beaker, add 6g of sodium hydroxide, 15mL of water, cover the watch glass and react violently, heat and dissolve on the electric furnace, add 150ml of hot water at 100°C (boiling), after cooling, compact t...

Embodiment 2

[0077] The aluminum alloy standard substances with magnesium contents of 5.16 wt % and 3.69 wt % were taken, and tested by the same method as in Example 1, and the results are shown in Table 4. It can be seen from the results in Table 4 that the error of the method of the present invention is ±0.10%, indicating that the present invention has good accuracy and precision.

[0078] Table 4

[0079]

[0080]

Embodiment 3

[0082] 1. The titer of pure magnesium

[0083] 1) Weigh 0.2000g~0.2200g of pure magnesium

[0084] table 5

[0085] Standard substance name

Sample weight (g)

Serving amount

pure magnesium

0.2005

5.00

pure magnesium

0.2148

5.00

[0086] Note: There is no impurity in this standard substance

[0087] 2) Dissolution of pure magnesium

[0088] Put the weighed pure magnesium into a 250ml beaker, add 6g of sodium hydroxide, 15mL of water, cover the watch glass and react violently, heat and dissolve on the electric furnace, transfer to a 200mL volumetric flask after cooling, dilute to the mark, and shake well spare.

[0089] 3) Separation and titration

[0090] Separate 5.00ml of the solution into a 300ml Erlenmeyer flask, add 70ml of boiling water, 10mL of buffer solution with pH=10, 1.5g of Neihei T indicator powder, titrate with 0.01mol / L EDTA standard solution to blue as the end point, record EDTA Amount of standard solut...

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Abstract

The invention discloses a copper reagent separation-EDTA titration method for measuring magnesium content of aluminum alloy. The copper reagent separation-EDTA titration method comprises the following steps: weighing 0.5000+ / -0.0100 g of an aluminum alloy sample into a beaker, adding 1-2 g of sodium hydroxide and 5-10 mL of water, heating for dissolving after violent reaction, and filtering after cooling; eluting the precipitate into the beaker by using 10-20 mL of hot hydrochloric acid (1+1) and 15-20 mL of hydrogen peroxide, heating till a boiling state to completely remove the hydrogen peroxide, regulating pH to 2-6, transferring to a volumetric flask, adding a copper reagent solution till the final concentration of a copper reagent in the volumetric flask is 0.25-0.75 g / L, filtering, taking 25.00 ml of a filtrate, adding 60-70 ml of boiling water, 8-10 mL of a buffer solution with the pH of 10 and an eriochrome black T indicator, titrating by using 0.01 mol / L of an EDTA standard solution till a blue color, and recording the using amount of the EDTA standard solution.

Description

technical field [0001] The invention relates to a detection method for magnesium in aluminum alloys, in particular to an analysis method for determining the magnesium content in aluminum alloys by using the EDTA complexometric titration method in the volumetric method. Background technique [0002] In general, the aluminum matrix in aluminum alloys accounts for more than 85 wt%, often accompanied by copper, magnesium, zinc, titanium, iron, silicon, nickel, manganese and rare earths. At present, in the national standard analysis method, no matter whether the EDTA complexometric titration method or other methods are used to determine the magnesium content in aluminum alloys, most of them use amphoteric sodium hydroxide of aluminum to dissolve the sample. At this time, all the aluminum is dissolved. Coexisting magnesium, iron, manganese, copper, and nickel form a precipitate residue in the solution, and the residue is separated by filtration. In a weak acid environment, copper ...

Claims

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Application Information

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IPC IPC(8): G01N21/79
Inventor 姚芳郅富国延凤泊许丽娟
Owner BEIJING INST OF NONFERROUS METALS & RARE EARTH
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