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GB/T 45480-2025Manganese ores and concentrates - Determination of aluminium content - Photometric and gravimetric methods (English PDF)

锰矿石和锰精矿铝含量的测定光度法和重量法

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

March 28, 2025

Implementation date

October 1, 2025

Scope

GB/T 45480-2025 is the English-translated version of 锰矿石和锰精矿铝含量的测定光度法和重量法.

GB/T 45480-2025 is a Chinese national standard for determining the aluminium content of manganese ores and concentrates. It sets out two analytical routes: a photometric method, presented as Method A, and a gravimetric method.

The photometric method covers mass fractions from 0.1% to 1.5%, while the gravimetric method is intended for contents above 1.5%. The document applies to both manganese ore and manganese concentrate.

It is modified to adopt ISO 4295:1988 and refers to several GB/T methods, including GB/T 6379.2 and GB/T 8170, as well as the verification regulations JJG 119 and JJG 178. Issued on 28 March 2025 and applicable from 1 October 2025.

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Document preview — GB/T 45480-2025

National Standard of the People's Republic of China

ICS: 73.060.20
Classification: D 32

Issued by: State Administration for Market Regulation, China National Standardization Administration

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Method A Photometric method

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document is modified to adopt ISO 4295:1988 "Manganese ores and concentrates - Determination of aluminium content - Photometric and gravimetric methods".

Compared with ISO 4295:1988, this document has many structural adjustments. Appendix A lists the differences between this document and ISO 4295:1988. Comparison table of structural number changes.

This document has many technical differences compared to ISO 4295:1988.The clauses involved in these differences have been marked in the outer margins.

The vertical single line (|) at the position is marked, and a list of corresponding technical differences and their reasons is given in Appendix B.

1 Scope

This document describes the spectrophotometric and gravimetric determination of the aluminium content of manganese ores and concentrates.

This document is applicable to the determination of aluminum content in manganese ore and manganese concentrate. Method A Photometric method, determination range (mass fraction). 0.1%~ 1.5%; Method B. Gravimetric method, determination range (mass fraction). greater than 1.5%.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document.

GB/T 2011 Sampling and sample preparation methods for bulk manganese ore

GB/T 6379.2 Accuracy (trueness and precision) of measurement methods and results Part 2: Determination of repeatability of standard measurement methods Basic methods of sex and reproducibility

GB/T 6682 Specifications and test methods for water used in analytical laboratories

GB/T 8170 Rules for rounding off values and expression and determination of limit values

GB/T 12806 Laboratory glassware single-line volumetric flasks

GB/T 12807 Laboratory glassware graduated pipettes

GB/T 12808 Laboratory glassware single-line pipettes

GB/T 14949.8 Determination of wet water content of manganese ore - Gravimetric method

JJG119 Laboratory pH (acidity) meter

JJG178 UV, Visible, Near Infrared Spectrophotometer

3 Terms and definitions

There are no terms or definitions that require definition in this document.

4 Method A Photometric method

4.1 Principle

The sample was decomposed with hydrochloric acid and nitric acid, then dissolved with hydrochloric acid, and the solution was evaporated to dryness twice.

The insoluble residue was separated by filtration, the filter paper containing the residue was burned, and the residue was treated with sulfuric acid and hydrofluoric acid.

The melt is dissolved in hydrochloric acid and the resulting solution is combined with the main solution.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

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