Method for detecting content of aluminum oxide in high-aluminum material

By using EDTA complexometric titration and high-temperature anhydrous sodium carbonate boric acid melt decomposition, the problems of inconsistent standards and incomparable data in the detection of alumina content in high-alumina products have been solved, achieving highly accurate and repeatable test results, thereby improving product quality assessment and market competitiveness.

CN122017122APending Publication Date: 2026-05-12DONGGUAN XINDONGXIN ENVIRONMENTAL PROTECTION INVESTMENT CO LTD +1
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Patent Information

Application Number
CN202610153480.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-03
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

The methods for detecting alumina content in high-alumina products are chaotic, the testing standards are inconsistent, the data is not comparable, and the test data is not consistent, which cannot truly reflect the alumina content and affects the stable control of the production process and the evaluation of product quality.

Method used

By employing EDTA complexometric titration combined with the high-temperature melting and decomposition of anhydrous sodium carbonate and boric acid, and determining the endpoint through indicator color changes, a scientific and stable alumina content detection process was established. Pretreatment conditions were optimized to overcome the influence of interfering elements, ensuring the full release of aluminum and accurate detection.

Benefits of technology

It improves the accuracy and repeatability of test results, solves the problem of inconsistent testing standards, provides a stable basis for data comparison, and enhances the reliability of product quality assessment and market competitiveness.

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Abstract

The invention discloses a method for detecting the content of aluminum oxide in a high-aluminum material, based on the principle of EDTA complexometric titration, EDTA and aluminum ions form a stable complex (1gK = 16.1) in a buffer system with the pH value of 6.0, and the end point is judged according to the color change (brilliant yellow-purplish red) of an indicator, the method has the advantages that insoluble substances such as aluminum nitride can be completely decomposed by adopting alkali fusion pretreatment of YST 575.1, and full release of aluminum elements is ensured; by combining a GB / T 6900 titration system and optimizing a buffer condition and a masking agent, interference of iron (III), calcium, magnesium and the like is effectively overcome, so that the method has high accuracy and strong anti-interference performance (can tolerate Cl <-> of less than or equal to 3.5% and Fe of less than or equal to 1.8%), and is suitable for detection of aluminum ash residue recycling products with complex components.
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