Method for measuring magnesium content in fluxing agent II

A measurement method, the technology of No. 2 flux, applied in the field of chemical analysis

Active Publication Date: 2013-05-08
SOUTHWEST ALUMINUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no EDTA complexometric titration method with more a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1.1 Mix 5.0g of 170# No. 2 flux sample with 200ml of water, boil for 30min, filter, discard the filtrate to obtain filter residue.

[0049] 1.2 Mix the filter residue obtained in 1.1 and the filter paper used for filtration with 20ml of salt-nitrate mixed acid, heat to dissolve the filter residue, add 50ml of boiling water, filter it into a 500ml volumetric flask with fast filter paper, wash the beaker and filter paper with boiling water, and add 30ml of sodium hydroxide solution (150g / L), cooled.

[0050] 1.3 Adjust the solution obtained in 1.2 with sodium hydroxide solution (150g / L) and hydrochloric acid until the Congo red test paper appears purple, add 1ml copper solution (1.3g / L), 30ml copper reagent (50g / L), and dilute with water to scale, mix evenly, let it stand for a while, and filter it into a dry and clean beaker with grade A absorbent cotton to obtain the filtrate.

[0051] 1.4 Pipette 50ml of the filtrate obtained in 1.3 into a 500ml conical beaker, add 50...

Embodiment 2

[0056] 2.1 Mix 5.0g of 171# No. 2 flux sample with 200ml of water, boil for 30min, filter, discard the filtrate to obtain filter residue.

[0057] 2.2 Mix the filter residue obtained in 2.1 and the filter paper used for filtration with 20ml of salt-nitrate mixed acid, heat to dissolve the filter residue, add 50ml of boiling water, filter it into a 500ml volumetric flask with fast filter paper, wash the beaker and filter paper with boiling water, and add 30ml of sodium hydroxide solution (150g / L), cooled.

[0058] 2.3 Adjust the solution obtained in 2.2 with sodium hydroxide solution (150g / L) and hydrochloric acid until the Congo red test paper appears purple, add 1ml copper solution (1.3g / L), 30ml copper reagent (50g / L), and dilute with water to scale, mix evenly, let it stand for a while, and filter it into a dry and clean beaker with grade A absorbent cotton to obtain the filtrate.

[0059] 2.4 Pipette 50ml of the filtrate obtained in 2.3 into a 500ml conical beaker, add 50...

Embodiment 3

[0064] 3.1 Mix 5.0g of 209# No. 2 flux sample with 200ml of water, boil for 30min, filter, discard the filtrate to obtain the filter residue.

[0065] 3.2 Mix the filter residue obtained in 3.1 and the filter paper used for filtration with 20ml of salt-nitrate mixed acid, heat to dissolve the filter residue, add 50ml of boiling water, filter it into a 500ml volumetric flask with fast filter paper, wash the beaker and filter paper with boiling water, and add 30ml of sodium hydroxide solution (150g / L), cooled.

[0066] 3.3 Adjust the solution obtained in 3.2 with sodium hydroxide solution (150g / L) and hydrochloric acid until the Congo red test paper appears purple, add 1ml copper solution (1.3g / L), 30ml copper reagent (50g / L), and dilute with water to scale, mix evenly, let it stand for a while, and filter it into a dry and clean beaker with grade A absorbent cotton to obtain the filtrate.

[0067] 3.4 Pipette 50ml of the filtrate obtained in 3.3 into a 500ml conical beaker, ad...

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Abstract

The invention provides a method for measuring magnesium content in a fluxing agent II. The method comprise the following steps of: putting a fluxing agent II sample to water, heating up and filtering the mixture to obtain filter residue; mixing and dissolving the filter residue with hydrochloric acid and nitric acid to obtain a solution; adjusting the pH value of the solution, adding a copper reagent to the solution, and filtering the solution to obtain filtrate; carrying out calcium-magnesium titration and calcium titration, and obtaining the content of the magnesium oxide through conversion of volume of a sodium ethylene diamine tetracetate standard titration solution which is consumed by the twice titration. Compared with an atomic absorption spectrometry or an ICP (Inductively Coupled Plasma) spectrometry in the prior art, soluble impurities such as un-reacted magnesium chloride, un-reacted potassium chloride and the like are firstly dissolved and removed by water; the magnesium oxide is dissolved by the mixture of hydrochloric acid and nitric acid; the interfering ions such as iron, manganese, aluminum, nickel, copper and the like in the solution are precipitated and separated by the copper reagent; and the content of the magnesium oxide is obtained through the conversion utilizing EDTA (Ethylene Diamine Tetraacetic Acid) complexometric titration. Therefore, the content of the magnesium oxide can be measured by only using simple glass wares and conventional chemical reagents without much investment, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis, in particular to a method for determining the content of magnesium oxide in No. 2 flux. Background technique [0002] The No. 2 flux is a eutectic melt obtained by melting and mixing potassium chloride, magnesium chloride, barium chloride and other chlorides at high temperature. It can also be synthesized by adding a small amount of barium chloride to carnallite and magnesium oxide, burning or other methods. It can be used for magnesium Production of magnesium-containing alloys such as alloys or aluminum-magnesium alloys. When metal magnesium is smelted at high temperature, block magnesium is easy to oxidize and burn. When it comes out of the furnace, add an appropriate amount of powdery No. 2 flux to prevent the combustion of metal magnesium; when refining metal magnesium, add No. 2 flux for refining. The impurity oxides and nitrides are precipitated in the medium, so the No. 2 flux c...

Claims

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Application Information

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IPC IPC(8): G01N31/22G01N31/16
Inventor 邓兰洪
Owner SOUTHWEST ALUMINUM GRP
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