Efficient and accurate method for detecting high-purity alumina content and impurity content

Abstract

The invention discloses a method for efficiently and accurately detecting the content of high-purity alumina and impurity content. The method includes the following steps: A. heating and fully impregnating accurately weighed mlg of alumina with high-grade pure concentrated hydrochloric acid, and then filtering , to obtain filtrate and filter cake respectively; B, the filtrate described in step A is detected and analyzed the impurity content in alumina with ICP-OES; C, the filter cake described in step A together with filter paper is fully After burning, weigh it accurately, record it as m2g, and calculate the content of alumina according to the difference between the two weighings. In the present invention, the main component of alumina is detected separately from the impurity components, and the relative deviation is small, and almost all the impurity components can be dissolved by impregnation with concentrated hydrochloric acid, and the detection results are true and reliable; there is no matrix interference, and the reliability of the detection results is higher than that of traditional methods. Simple operation and fast analysis.

Description

Technical field [0001] The invention relates to a physical and chemical analysis method of alumina, in particular to a method for efficiently and accurately detecting the content of high-purity alumina and the content of impurities. Background technique [0002] Current research shows that many kinds of heavy metals have a great negative effect on the performance of glass substrates and production equipment, and some heavy metals and non-metals have great environmental pollution. A large part of these heavy metals are introduced from the raw materials for the production of glass substrates. Among them, alumina is an important raw material for glass substrates, and its weight percentage is about 15-25%. Even if it is high-purity alumina, it is still It contains some heavy metal elements, so strengthening the detection and analysis of the main content of alumina and the content of impurity components is particularly important for the quality control of glass substrates. [0003] Alu...

AI Technical Summary

Problems solved by technology

However, these methods have their own disadvantages

[0004] For example, the disadvantages of the sodium-alkali fusion method: (1) Since sodium hydroxide and sodium carbonate are used as solvents, the solution obtained after sample processing cannot be used to determine the sodium content, but the glass substrate industry requires effective control of the sodium content

Therefore, this method has certain limitations

(2) Because the content of impurity elements in the sample is inherently low, the use of various complex reagents in the sample processing process will also cause serious interference of the matrix, resulting in unreliable ICP test results

[0005] For example, the disadvantages of boric acid and starch mixed flux melting method: the sample needs to be melted with a mixed solvent at 1100 ° C for 30 minutes, then soaked in boiling water to remove the frit, dissolve the frit with hydrochloric acid, and then filter

The process is cumbersome, the analysis efficiency is low, it is easy to cause the loss of components in the sample, and the cost of electricity is high

[0006] The detection results of X-ray fluorescence spectroscopy have large deviations; while chemical titration and spectrophotometer methods require a large number of sample pretreatments, the processing time is long, and the most important thing is that the detection results have large deviations

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