NB/T 11260-2023Determination of silicon, aluminum, iron, calcium, magnesium, sodium, potassium, phosphorus, titanium and manganese in coal gangue—X-ray fluorescence spectrometric method (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

1 Scope

This document specifies the summary of methods for the determination of silicon, aluminum, iron, calcium, magnesium, sodium, potassium, phosphorus, titanium and manganese in coal gangue using X-ray fluorescence spectroscopy.

Reagents and materials, instruments and equipment, sample preparation, test procedures, result calculation and expression, method precision.

This document is applicable to the determination of silicon, aluminum, iron, calcium, magnesium, sodium, potassium, phosphorus, titanium and manganese content in coal gangue.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 212 Industrial analysis methods for coal

GB/T 6379.2 Accuracy of measurement methods and results (correctness and precision) 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

3 Terms and definitions

There are no terms or definitions to be defined in this document.

4 Method summary

The coal gangue is ashed and then melted with flux to make sample pieces. After the sample is irradiated by primary X-rays, the atoms of the element to be measured emit X-rays

Fluorescence, measuring the X-ray fluorescence intensity of the element to be measured through a detector, based on the quantitative relationship between the X-ray fluorescence intensity and content of the element to be measured

System, apply the calibration curve or appropriate mathematical correction mode to calculate the content of the element to be measured.

5 Reagents and materials

Unless otherwise stated, only reagents confirmed to be of analytical grade or above and grade three or above that comply with GB/T 6682 are used in the analysis. Distilled water or water of equivalent purity.

5.1 Detector gas. The gas composition is 90% argon and 10% methane, other compositions can also be used.

5.2 Fluxing agent. anhydrous lithium tetraborate and anhydrous lithium metaborate, both of which are excellent grade pure and need to be burned at 200°C for 2 hours before use.

5.3 Oxidizing agent. lithium nitrate.

5.4 Release agent. lithium bromide.

5.5 Standard sample. Commercially available certified standard sample. Including but not limited to certified coal ash, gangue lime composition standard materials or matching the sample matrix A mixture of pure chemicals.