Method for measuring tin content in polymetallic ore through alkali dissolution-hydrochloric acid-hydrofluoric acid acidification complexation

By treating ore samples using an alkaline dissolution-hydrochloric acid-hydrofluoric acid acidification complexation method, combined with ICP-OES determination of tin content, the problem of inaccurate tin determination results in complex matrices was solved, achieving high recovery rate and high precision tin analysis.

CN122468698APending Publication Date: 2026-07-28SICHUAN XIYE GEOLOGY TESTING TECH CO LTD
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Patent Information

Application Number
CN202610903122.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-23
Publication Date
2026-07-28

AI Technical Summary

Technical Problem

Existing technologies suffer from severe interference when determining tin in complex matrices (high phosphorus, high aluminum, high silicon, niobium-tantalum), resulting in low tin recovery rates and inaccurate results.

Method used

The alkali-hydrochloric acid-hydrofluoric acid acidification complexation method was adopted. After the ore sample was melted and decomposed with sodium peroxide, a mixture of hydrochloric acid and hydrofluoric acid was added to form a soluble fluorine complex. The tin content was determined by full-spectrum direct-reading inductively coupled plasma optical emission spectrometry (ICP-OES).

Benefits of technology

It effectively eliminates matrix interference, increases tin recovery to 101%~105%, and has a relative standard deviation of less than 0.57%. The results are accurate and reliable, and it is suitable for rapid analysis of complex geological samples.

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Abstract

The invention discloses a method for measuring the tin content in polymetallic ore through alkali dissolution-hydrochloric acid-hydrofluoric acid acidification complexation, and belongs to the technical field of ore analysis and testing. In order to solve the problems that high-phosphorus, high-aluminum, high-silicon and niobium-tantalum-containing complex matrixes interfere with tin determination and the recovery rate is low in an existing sulfuric acid system, sodium peroxide is adopted to melt and decompose a sample, hydrochloric acid-hydrofluoric acid mixed acid is added for acidification complexation after hot water extraction, silicon, aluminum, niobium, tantalum and the like are converted into soluble fluorine complexes, and the soluble fluorine complexes are obtained. Colloid formation and tin adsorption loss are effectively inhibited; and determining the characteristic spectral line of tin by combining inductively coupled plasma emission spectrometry. According to the method disclosed by the invention, the adding standard recovery rate is 101-105%, and compared with a potassium iodate titration method, the result is accurate and reliable. The method is simple, convenient and efficient to operate, effectively eliminates the interference of a complex matrix, and is suitable for accurately determining tin in high-phosphorus and high-aluminum complex ore samples containing niobium and tantalum, such as amblygonite.
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