Method for testing content of aluminum oxide in aluminum metaphosphate

A technology of aluminum metaphosphate and testing method, which is applied in the direction of chemical analysis by titration method, can solve the problems affecting the accuracy of test results, the types and amounts of reagents used are large, and the analysis process is complicated, so as to achieve the advantages of popularization and utilization, high accuracy High and reproducible results

Active Publication Date: 2015-11-11
CDGM OPTICAL GLASS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has high accuracy, but for testing the content of alumina in aluminum metaphosphate, the analysis process is more complicated, the analysis period is longer, the sample needs to be burned with a mixed flux at 900°C, and the types and amounts of reagents used are relatively large. can affect the accuracy of test results

Method used

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  • Method for testing content of aluminum oxide in aluminum metaphosphate
  • Method for testing content of aluminum oxide in aluminum metaphosphate
  • Method for testing content of aluminum oxide in aluminum metaphosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1) Weigh 0.2g (accurate to 0.0001g) of the sample dried at 105°C into a beaker, add 10mL of 100g / L sodium hydroxide solution until the sample is completely dissolved; add 10mL of 6mol / L hydrochloric acid until the solution becomes acidic;

[0045] 2) Add 20mL of 0.05mol / L disodium edetate standard solution, add 2 drops of phenolphthalein, neutralize it with ammonia water to red, then adjust it to colorless with hydrochloric acid and add one drop in excess; add 10mL of 60% ammonium acetate, heat and boil for 3min Take it off, add 2 drops of xylenol orange solution, and titrate with zinc sulfate standard solution to red;

[0046] 3) Add 30mL of 50g / L sodium fluoride solution, heat and boil for 3min to take it off, and then titrate with zinc sulfate standard solution to red as the end point;

[0047] 4) Result calculation

[0048] Al 2 O 3 ( % ) ...

Embodiment 2

[0055] 1) Weigh 0.3g (accurate to 0.0001g) of the sample dried at 105°C into a beaker, add 15mL of 100g / L sodium hydroxide solution until the sample is completely dissolved; add 15mL of 6mol / L hydrochloric acid until the solution becomes acidic;

[0056] 2) Add 30mL of 0.05mol / L disodium edetate standard solution, add 2 drops of phenolphthalein, neutralize it with ammonia water to red, then adjust it to colorless with hydrochloric acid and add one drop in excess; add 15mL of 60% ammonium acetate, heat and boil for 3min Take it off, add 3 drops of xylenol orange solution, and titrate with zinc sulfate standard solution to red;

[0057] 3) Add 35mL of 50g / L sodium fluoride solution, heat and boil for 4min to remove, then titrate with zinc sulfate standard solution to red as the end point;

[0058] 4) Result calculation

[0059] Al 2 O 3 ( % ) = ...

Embodiment 3

[0066] 1) Weigh 0.4g (accurate to 0.0001g) of the sample dried at 110°C into a 250mL beaker, add 20mL of 100g / L sodium hydroxide solution until the sample is completely dissolved; add 20mL of 6mol / L hydrochloric acid until the solution becomes acidic;

[0067] 2) Add 40mL of 0.05mol / L disodium edetate standard solution, add 3 drops of phenolphthalein, neutralize it with ammonia water to red, then adjust it to colorless with hydrochloric acid and add one drop in excess; add 20mL of 60% ammonium acetate, heat and boil for 5min Take it off, add 2 drops of xylenol orange solution, and titrate with zinc sulfate standard solution to red;

[0068] 3) Add 40mL of 50g / L sodium fluoride solution, heat and boil for 5min to take it off, and then titrate with zinc sulfate standard solution to red as the end point;

[0069] 4) Result calculation

[0070] Al 2 O 3 ( % ) ...

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Abstract

The invention provides a method for testing the content of aluminum oxide in aluminum metaphosphate, which is simple to operate, rapid and accurate. The method comprises the following steps: (1) measuring a test sample, adding a sodium hydroxide solution into the test sample until the sample is completely dissolved, and adding hydrochloric acid until the solution is acidic; (2) adding an ethylene diamine tetraacetic acid standard solution, uniformly stirring, adding several drops of phenolphthalein, neutralizing by utilizing ammonia water until the solution is red, then adjusting the solution to be colorless by utilizing the hydrochloric acid, and adding an additional drop of the hydrochloric acid; adding ammonium acetate, heating and boiling, adding several drops of a xylenol orange solution, and titrating by utilizing a zinc sulfate standard solution until the solution is red; (3) adding a sodium fluoride solution, heating and boiling, and titrating the solution to be red by utilizing the zinc sulfate standard solution; (4) calculating a result. The sodium hydroxide solution is used for rapidly dissolving the test sample, so that the method has the advantages of easiness in operation, simplicity, rapidness, high accuracy and the like.

Description

technical field [0001] The invention relates to the field of chemical analysis and testing, in particular to a method for rapidly dissolving aluminum metaphosphate and accurately testing the content of aluminum oxide in aluminum metaphosphate. Background technique [0002] Aluminum metaphosphate is a raw material for making optical glass, and its purity directly affects the optical properties of optical glass. At present, there is no national standard test method for the detection of the purity of aluminum metaphosphate. The industry measures the purity of aluminum metaphosphate by testing the content of phosphorus pentoxide or alumina in aluminum metaphosphate, and then converting it into metaphosphoric acid by a certain coefficient. Aluminum purity. [0003] At present, the content of phosphorus pentoxide in aluminum metaphosphate is tested by quinoline phosphomolybdic acid gravimetric method. The precision and accuracy of this method are very good. The disadvantage is th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
Inventor 王琳琨罗良红唐继鲜彭文俐李晓勤杨峰
Owner CDGM OPTICAL GLASS
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