Method for measuring ferrous iron content in laterite nickel ore

By using common and inexpensive mixed acid solutions and potassium dichromate standard solution titration, combined with phosphoric acid and boric acid solutions to mask interfering factors, a highly sensitive and low-cost method for detecting ferrous content in lateritic nickel ore is provided. This method overcomes the shortcomings of existing detection methods and is suitable for the accurate detection of ferrous content in lateritic nickel ore.

WO2025260230A1 Publication Date: 2025-12-26PT QMB NEW ENERGY MATERIALS +2
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Patent Information

Application Number
PCT/CN2024/099758
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-06-18
Publication Date
2025-12-26

AI Technical Summary

Technical Problem

Existing methods for detecting ferrous content in laterite nickel ore suffer from insufficient sensitivity, poor accuracy, cumbersome operation procedures, and high costs.

Method used

The lateritic nickel ore sample was decomposed using a first mixed acid solution. A second mixed acid solution was then mixed and sodium diphenylamine sulfonate was added as an indicator. The solution was titrated with potassium dichromate standard solution. The titration endpoint was reached when the solution color changed to blue-purple. Phosphoric acid and boric acid solutions were used to mask interfering factors. Common and inexpensive reagents were used for detection.

Benefits of technology

It improves the sensitivity and accuracy of detection, simplifies the operation steps, reduces the detection cost, adapts to the sample analysis needs of different concentration ranges, and is suitable for large-scale promotion and application.

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Abstract

A method for measuring the ferrous iron content in a laterite nickel ore, comprising the following steps: (1) decomposing a laterite nickel ore sample by using a first mixed acid solution to obtain a sample solution; (2) mixing a second mixed acid solution and the sample solution, and dropwisely adding sodium diphenylamine sulfonate to the obtained mixed solution as an indicator; (3) titrating the mixed solution by using a potassium dichromate standard solution, a titration endpoint being reached when the color of the solution changes to purple blue; and (4) calculating the ferrous iron content in the laterite nickel ore sample on the basis of the consumption amount of the potassium dichromate standard solution, wherein the first mixed acid solution in step (1) comprises a sulfuric acid solution and a hydrofluoric acid solution, and the second mixed acid solution in step (2) comprises a sulfuric acid solution, a phosphoric acid solution and a boric acid solution.
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