GB/T 6609.22-2026Chemical analysis and physical property determination methods for alumina — Part 22: Sampling and preparation of test samples (English PDF)

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020 "Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents".

This document is Part 22 of GB/T 6609 "Chemical analysis methods and determination of physical performance of alumina". GB/T 6609 has issued the following parts:

- Part 1: Determination of trace elements content - Inductively coupled plasma atomic emission spectrometry method;

- Part 2: Determination of loss of mass at 300 °C and 1000 °C;

- Determination of silicon dioxide content - Molybdenum blue photometric method;

- Determination of ferric oxide content - Orthophenanthroline photometric method;

- Part 5: Determination of sodium oxide and potassium oxide contents;

- Part 7: Determination of titanium dioxide, chromium sesquioxide, cupric oxide, fluorine, chlorine, boron trioxide, phosphorus pentoxide, sulfate contents - Spectrophotometry method;

- Determination of vanadic oxide content - N-benzoyl-N-phenylhydroxylamine extraction photometric method;

- Part 11: Determination of manganese oxide and magnesium oxide contents - Flame atomic absorption spectrometric method;

- Part 12: Determination of zinc oxide content - Flame atomic absorption spectrometry method;

- Part 13: Determination of calcium oxide content - Flame atomic absorption spectrometric method;

- Part 19: Determination of lithium oxide content - Flame atomic absorption spectrometry method;

- Determination of gallium trioxide content - Butyrhodamine B spectrophotometric method;

- Part 22: Sampling and preparation of test samples;

- Part 24: Measurement of the angle of repose and the angle of flow;

- Part 25: Method for the determination of tapped and untapped density;

1 Scope

This document describes the sampling, preparation, and storage methods for original and dried alumina test samples used for composition analysis and determination of physical properties of alumina.

This document applies to sampling and preparation of test samples of alumina during processes such as transportation (e.g., when conveyed by conveying machinery), loading and unloading (e.g., when unloaded into containers, silos, or warehouses), and continuous flow.

2 Normative references

There are no normative references in this document.

3 Terms and definitions

For the purpose of this document, the following terms and definitions apply.

4 Method overview

A constant amount of sample is taken in multiple portions by manual or mechanical means. The sample retains its physical and chemical properties at the time of sampling.

The sample is mixed and divided to meet the requirements for laboratory testing. The sample is stored and transported in sealed containers at room temperature.

5 Apparatus

5.1 Sampling apparatus: Manual or mechanical sampling apparatus, such as an Archimedes screw, inclined chute, or probe.

5.2 Sample container: With appropriate volume, preferably made of rigid material.

5.3 Receiving container: With appropriate volume, preferably made of rigid material.

5.4 Divider: Rotary divider or riffle divider.

5.5 Oven: Capable of maintaining a temperature of 300 °C ± 10 °C.

5.6 Test sieve: Aperture size 0.125 mm. Made of a material that will not introduce the impurities to be tested. The test sieve shall be selected based on the properties of alumina and the impurities to be tested.

5.7 Corundum mortar.

5.8 Desiccator: With activated alumina or phosphorus pentoxide as desiccant.

6 Sampling

7 Preparation of test samples