A sample preparation method for determining fluorine content of fluorine-containing aluminum oxide

By using concentrated sulfuric acid or its mixed acid leaching solution to extract fluorides from fluorinated alumina, the problems of long sample preparation time and large errors in the existing technology are solved, and the rapid and accurate determination of fluorine content in fluorinated alumina is achieved, meeting the needs of industrial production.

CN115683762BActive Publication Date: 2026-07-24CHALCO GANSU ALUMINUM ELECTRICITY CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHALCO GANSU ALUMINUM ELECTRICITY CO LTD
Filing Date
2021-07-29
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

The lack of rapid and accurate sample preparation and determination methods for analyzing the fluorine content of fluorine-loaded alumina in the existing technology leads to unstable measurement data that cannot meet the needs of industrial production.

Method used

Concentrated sulfuric acid or a mixture of concentrated nitric acid and concentrated hydrochloric acid is used as the leaching solution. Fluorinated alumina sample is weighed, stirred in boiling water, and allowed to stand to leach fluoride into the solution, thus avoiding excessive dissolution of aluminum and achieving a rapid and accurate sample preparation process.

Benefits of technology

This method enables rapid and accurate determination of fluorine content in fluorinated alumina. Multiple parallel sample preparations ensure effective control of the electrolytic aluminum flue gas purification system and reduce analysis costs.

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Abstract

The application discloses a kind of sample preparation methods for fluorine content determination of fluorine-loaded aluminum oxide, belong to chemical analysis technical field, to solve the problem of no special, fast, efficient method in sample preparation link when fluorine content determination of fluorine-loaded aluminum oxide.Method includes weighing and dispersion leaching.The application solves the problem that a small amount of fluorine escapes in the distillation separation method, resulting in a large error, and the sample preparation is time-consuming, inefficient, and not suitable for industrial production;Avoid the problem that the fluorine content cannot be measured after the sample is completely dissolved in the melting method due to high aluminum and low fluorine;Cleverly use the leaching method, only leach the fluorine in the sample, and only a small amount of aluminum is dissolved in the solution during leaching, which can ensure that the fluorine is completely dispersed in the solution and the aluminum content in the solution is not too high to interfere with the subsequent determination, and the whole sample preparation can be done in parallel with multiple groups, with a time consumption of less than half an hour, which can meet the requirements of rapid sample preparation and accurate determination of fluorine content of fluorine-loaded aluminum oxide, and ensure that the electrolytic aluminum flue gas purification system can be adjusted at any time according to the value.
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