Method for detecting impurity components in alpha-alumina

Abstract

The invention discloses a method for detecting impurity components in alpha-alumina, which belongs to the glass manufacturing field, and sequentially comprises the following steps that: an alumina sample is weighed and is placed into a NO. 1 digestion tank and a NO .2 digestion tank, and then a digestion agent is added into the NO. 1 and the NO. 2 digestion tanks; a sample blank experiment is done for a NO. 3 digestion tank, a NO. 4 digestion tank, a NO. 5 digestion tank and a NO. 6 digestion tank; digestion is simultaneously carried out in each digestion tank; the digestion tanks are heated so as to remove partial acid; the NO. 1, the NO. 2 and the NO. 3 digestion tanks are transferred into a volume bottle to so as to fix the volume; the NO 4, the NO. 5 and the NO. 6 digestion tanks are transferred into a volume bottle, standard solution Y with appropriate quantity is respectively added into the NO. 4 digestion tank to be used as an inner calibrated standard solution; detected element standard solution with appropriate concentration is added into NO. 5 and NO. 6 digestion tanks to fix the volume; and the contents of impurity components of the alumina are measured through an internal standard method by placing the mixed solution on inductively coupled plasma (ICP). The method has the advantages that the analysis process is simple, the electric power cost is low, a crucible is difficult to damage, samples can be completely dissolved, the components are difficult to lose, and the matrix interference is low.

Description

technical field [0001] The invention belongs to a detection method in the field of glass manufacturing. Background technique [0002] High-content a-Al2O3 is one of the indispensable raw materials for liquid crystal glass substrates. It has a high melting point, a special crystal structure, and is insoluble in any acid-base solution. The sample processing process for the detection of its impurity components is quite difficult. At present, the commonly used methods include sodium-alkali melting method and boric acid and starch as mixed solvent melting method. However, these two dissolution methods have their own disadvantages. [0003] 1. Sodium-alkali fusion method: [0004] (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. [000...

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Problems solved by technology

[0004] (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

[0005] (2) The sample frit is leached in water and then dissolved in acid. During this process, it is easy to cause the splash of the sample, and the sample frit still cannot be completely dissolved, so it must be filtered and washed, which will cause secondary loss of components.

[0006] (3) 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

[0007] (4) The analysis steps are too cumbersome, the efficiency is low, and the crucible is easily damaged, and the power cost is high

The process is cumbersome and the analysis efficiency is low

[0010] (2) It is easy to cause the loss of components in the sample

[0011] (3) The use of complex solvents to process samples will cause serious matrix interference and unreliable analysis results

[0012] (4) High electricity cost

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